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    Mgb overdrive slow to engage. 1958 MG MGA 1970 MG MGB.

    Mgb overdrive slow to engage In order to try and pinpoint the issue, I am working through the process of elimination. Remedy to starter gear that doesn't engage? Started by MTribe; Jul 28, 2008; Replies: 15; TR4/4A TR4 overdrive slow to engage. It should click when energised. A low level. 2. The problem could be low oil level or it could be the OD operating solenoid is not staying engaged. 70 MGB electric overdrive slow to engage #1. Joined 11 years ago. Now overdrive oil pressures are 50 and 450 psi. It has become progressively worse now and takes 5 or 6 tries to engage to overdrive. As the engagement of the overdrive is slow every time, but does eventually engage every time, I am thinking there is nothing wrong with the pump. The MG Experience. 1972 mgb gt blue label overdrive unity I believe my overdrive unit needs a good in place servicing/internal cleaning. Would it have a failsafe where it would not allow the overdrive to engage or would it fail leaving the overdrive permanently engaged irrespective of the dashboard switch position? TR4/4A TR4 overdrive slow to engage: Triumph: 5: Apr 8, 2005: R: BN4 Transmission/Overdrive Repair Shop: Austin Healey: 2: For Sale MGB Black Label Overdrive For Sale Or Trade For New RB Parts. - All electrical connections are I am preparing to change the oil in my transmission and have a few questions regarding my overdrive. All of these are the Laycock Engineering / GKN Laycock manufactured units based on the designs of Edgar De Normanville. Why is my overdrive slow to engage? Austin Healey: 4: Jun 11, 2006: S: TR4/4A TR4 overdrive slow to engage: Triumph: 5: Apr 8, 2005: R: BN4 Transmission/Overdrive Repair Shop: Austin Healey: 2: Feb 12, 2025: For Sale Austin Healey Laycock Type A Overdrive Parts: Austin Healey Classifieds: 0: Dec 28, 2024: S: For Sale Spitfire 1500 Overdrive serves the overdrive and a low oil level could cause the overdrive to be slow to engage, fail to engage or cycle in and out. If adjustment is an issue, it will often show up by the overdrive dropping in and out as the gear lever is moved. I drained the transmission, replaced the screen, and cleaned the sump cover which was covered with a thick gray sludge-like mess. . Find the fuel pump wire (White) in the rear loom, The overdrive works fine the first time I engage it on a journey but then doesn't work again if I engage later on the same journey. Is my relay Home. However the problem soon again becomes apparent, until again I put it into OD. bryant1970mgb Bryant Aydelette. Sign in to contact. J. The only way I can remedy this is to engage overdrive, where magically it is restored. Another excellent explanation from Chrysler in 1936 of how a gearbox works, including synchromesh. Overdrive oil pressures are 50 and 450 psi. Had it out yesterday temps between 12-23*F Car ran beautifully, engine was up to operating temperature, overdrive was slow to engage, disengaged as normal. 1969 MGB Roadster 2020 MG HS Exclusive 2007 Mercedes SLK Plus 34 other cars since 1965. A related issue may be the oil is dirty, so if it's been in there a while, drain Drain plug (1), Cover (3), Filter & gasket (4), Magnets (5), Relief valve filter plug (6), Sealing washer (7), Relief valve (8), Filter (9), 4) Pump. 1971 MG MGB 1971 MG MGB GTMG MGB GT The D-type, Mk I MGB overdrive gearbox was however only offered here in Australia in the last few months of Mk I assembly, January to August 1968. Oh, and for locking the MGB MGB Laycock Type D overdrive 3 syncro: MG: 8: May 3, 2007: M: Laycock Bench testing the overdrive shows that the overdrive is no longer sporadic, it now does not engage at all. While it's possible to engage overdrive in third gear on the earlier models (pre-76), there is just no point in doing so. Any ideas what‘s the My 70 MGB has electric overdrive which recently has become sluggish in engaging. The overdrive does not engage at the same time I put the switch but with a delay of 5 seconds. But the thing is, how and when am I supposed to use the overdrive? My father who used to drive overdrive cars a lot says to put it into overdrive as soon as you get into 4th, but I tend to use it like a 5th gear, i. The overdrive appears not to be a Laycock type, from what I understand it is a "D Type". I guess it's not electrical because tapping the gas pedal and rocking the car gets it to disengage. In standard or To fit overdrive, you just buy a simple overdrive wiring harness from Moss for about 28 bucks, plug it into this yellow wire, and route it on down to the overdrive unit. To engage overdrive move the switch lever towards the steering-wheel; to disengage move the lever away from the steering-wheel. when the revs get too high in 4th then I engage it. When I switched the overdrive off, it would feel like it was "halfway" disengaged and the Later models of MGB have the overdrive switch built into the top of the gearshift knob. Also known a Laycock de Normanville overdrives. I don’t think the fiber washers are up to the task. I have watched the John Twist video and while the information is good, the quality of the video I watched is The D-type, Mk I MGB overdrive gearbox was however only offered here in Australia in the last few months of Mk I assembly, January to August 1968. It sometimes over runs when slowing down. Abingdon had gone over to the Mk II by then. Overdrive not working – first 1967 mgb gt sc 1975 mgb sc 1973 1800es 1972 Citroen ID21 wagon Location: Santa Barbara CA. Simply The likely causes for an overdrive cycling in and out are a faulty overdrive inhibitor switch, a low oil level in the gearbox, an ageing seal causing an oil pressure leak, a faulty seating for the Overdrive can be engaged at any throttle opening when in third or top gear. The most common fault is a sticky Yes, there's an electric lockout that is supposed to prevent overdrive being engaged with reverse selected. Post by Stewart » Sun Sep 11, 2011 9:29 pm. overdrive; tyres; MGB GT Spitfire Alfa Spider series 4 Current (sold Jan 2018 ) 1974 TR6 Current; Report; West Midlands, England, UK . If increased acceleration is required the overdrive can be 'switched out' without alteration to the I reassembled everything as I had to drive home and to my surprise the o/d works fine, ( a bit slow to engage at first but it hasn't been operated for 20 years) Now works as it Re: Overdrive Engage/Disengage question [Problem. When the overdrive is disengaged and no power is going to the solenoid, all (actually almost all) of the oil pressure is being diverted directly back into the overdrive sump. Is this true? 5) Accumulator. Originally, I thought that switchin it on or off and then getting it to engage by going off the accelerator for a moment was correct, due to the overdrive itself being a clutch an the planetary gears always being engaged. Greensboro, NC, USA . You can help ensure that British Car Forum (BCF) continues to provide a great place to engage in the British car hobby! If you find BCF a you definitely will get slow actuation. Started by thomasd; Dec 19, 2022; Replies: 2; MG Classifieds. Started by Norton47; Apr 6, 2008; Replies: 7; Oct 13, 2021 · Clutch, overdrive, overdrive, clutch!!! What I don’t want to do is replace the Clutch and associated bits and bobs only to find it’s a bigger problem. In reply to # 3604157 by Steven 67GT I have a 4 sync o/d with 3rd and 4th o/d. engine and all syncro overdrive box in an MGA Coupe - have just had the overdrive box repaired - new sliding member installed (snap ring came loose, also overdrive face was about 70% worn, normal drive face showed signs of slipping (black lining)). There should be a rubber plug under the transmission tunnel carpet to access the transmission oil level. Hi, I have a 1965 Mk1 MGB. The reverse works fine when the engine is cool. Started by spbvmb; Apr 8, 2005; Replies: 5; Triumph. I hooked up voltage tester to the wire just p May 12, 2018 · Today it does not engage. Posted by MikeMGA . But, that's the end of your overdrive if the switch fails. e. MGB MGB Reverse Hard to engage. This also is the first steps in problem resolution or diagnostics. Later These can also fail completely, but its most common fault is its sensitivity to adjustment. So this is the first winter my overdrive and time I have had my overdrive out in the “real” cold. Usually I can flick in and out of overdrive with almost no delay. 1962 Ever since I bought the car the OD had been lazy to engage when hot and similarly to disengage. The early, early wiring harness contains the necessary Overdrive options for an MGB fall into 3 types. USE OF THE OVERDRIVE SWITCH AS AN ANTI-THEFT DEVICE If you do not have overdrive fitted to your 1968-76 MGB, you can use the overdrive switch to turn the fuel pump off and on. The overdrive slips in and out weather the switch is engaged or not. MGB How does on tell if an MGB has Overdrive. 1958 MG MGA I installed my OD 2 years ago and used a fiber washer on the 3/4” hex head plug on the non return valve below the pump and even though I cinched it up I found it not snugged up so I tightened it and again it loosened up . Much easier to take out the whole engine and gearbox as one unit although it is more work. Overdrive wont disengage. David Ramsbotham As the overdrive was working before taking the car “off the road”, While returning from a day out yesterday and traveling at approx 65mph I tried to engage overdrive, the result was what I can only describe as the classic learner problem of kangaroo petrol. After a few days of (long distance) driving, my Gearbox oil is dropping and the OD function becomes slow, then erratic. any ideas? I supose the first thing to do is to check the oil level. As soon as I switched the OD off it stopped but when I tried it again the same thing happened. Overdrive engages straight away when switched but does not disengage despite oil being warm and switch being operated on off multiple times, even . To check for this: engage overdrive in 3rd gear and while in gear pull the gear lever as far to the right as you can. I have heard some folks suggest a different oil rating other than 20W50; any suggestions other than getting into the overdrive; my mechanic is very busy as usual; which I am very In overdrive-overdrive does not work: Open the bottom of the overdrive unit and clean all the parts-the solenoid, piston, ball, and housing; the oil pressure relief valve; and the oil pump. If it was somehow losing pressure, or was not pumping, the unit would in theory not engage at all. i removed the cover plate and the solenoid cover plate and the pressure relief valve plug bolt , replaced gaskets. Usually I can flick On a recent long trip in my '72 MGB roadster I noticed that the overdrive was sometimes slow to disengage after the car had been running at highway speed in overdrive for a long time. TR4/4A TR4 overdrive slow to engage: Triumph: 5: Apr 8, 2005: R: BN4 Transmission/Overdrive Repair Shop: Austin Healey: 2: For Sale MGB Black Label Overdrive For Sale Or Trade For New RB Parts. I think the snap ring that holds the floating drum to the overdrive slide has come off. Have finally got my Sebring replica on the road, lots of tiny problems. When I switched the overdrive off, it would feel like it was "halfway" disengaged and the Lately, after running on the highway I turn the overdrive off and it doesn't disengage. Overdrive engages straight away when switched Yes, check the oil level. O. So the oil has been drained again, and refilled During a long run the J type overdrive was becoming slower to engage taking a good few seconds. My question is can the overdrive unit be removed from the transmission with th Feb 13, 2013 · MGB & GT Forum. T-Series Can't disengage clutch. Last year I changed the transmission oil with 30w Primer guide to MGB overdrive transmissions. It would then work fine, until it was parked a few minutes, then more driving would be needed until it worked again. Started by jimmiekeyes; Feb 12, 2005; First, check the oil level in the gearbox. Non-Overdrive Benefits? Started by Fanch00; Just wondered what is the best/safest way to disengage the overdrive when slowing down. Dirty hydraulic components or, more commonly, a worn sliding member (cone clutch) causes this. When it is being reversed at the end of a journey it doesn't engage and makes a whirring sound. My 79B runs great now that I've spent the winter working on it, but in the back of my mind, I Have finally got my Sebring replica on the road, lots of tiny problems. Hi, I am running an 5 brg. The solenoid and O rings were replaced, but this gave no improvement. If that's ok remove the switch and with it switched on, check for battery voltage on both terminals. New posts Rules. Would it have a failsafe where it would not allow the overdrive to engage or would it fail leaving the overdrive permanently engaged irrespective of the dashboard switch position? Some overdrive maintenance is possible while the gearbox is in the car. It's been cold here in South Carolina, around 35. SLUGGISH OVERDRIVE I recently came across an MGB overdrive which was slow to engage, and in some cases wouldn’t engage at all until the car had warmed up. information about the MGB and MGB GT classic cars including news and reviews, techs and specs – also updates on repairs, servicing and diy modifications I do on my own MGB Roadster. If I tap the gas pedal a few times it will disengage. A freewheeling clutch can allow the engine to return to idle while the car is still running down the highway at 60 mph. The issue that I am experiencing is that the o/d does not fully disengage when I come off the freeway in o/d, depress the clutch, switch off o/d and then put the transmission in neutral while applying Yes, check the oil level. quit working. When I switched the overdrive off, it would feel like it was "halfway" disengaged and the I can attest that the 79' MGB recently purchased, I have noted numerous times that it only take a very low speed to generate enough overdrive oil pressure to engage the overdrive, well less than the reported 18 mph, and if Did the overdrive disengage when you switched it off on the gear lever switch or did you leave the switch on and did you replace the inhibitor switch? It would be worth reading the MGB overdrive thread. During the Overdrive service, I replaced May 5, 2020 · I bought an early MGB gearbox with a Laycock type D overdrive to fit into my MGA, (description and photos on the MGA Forum: A on a shoe string; ‘Fitting a D type overdrive gearbox’ posted mid April) the car is presently in 1966 MGB with Type D overdrive. I have heard some folks suggest a different oil rating other than 20W50; 70 MGB electric overdrive slow to engage #1. Overdrive issue. But there is a wide area between those extremes. the overdrive is now constantly engaged and i have oil dripping from the pressure relief valve plug which has bubbles in it when it leaks. Aft So this is the first winter my overdrive and time I have had my overdrive out in the “real” cold. This wiring harness also includes two new green wires for Early MGB D Type Overdrive Under Hood Components and Wiring. Started by glemon; Jun 9, 2009; Replies: 4; MG. If that's ok the next item is the overdrive solenoid which is accessible from underneath the car. I have heard some folks suggest a different oil rating other than 20W50; any suggestions other than getting into the overdrive; my mechanic is very busy as usual; which I am very glad for h It is bolted to a 1970 (probably original to the rusted-out 1970 body) overdrive transmission - all new clutch components including flywheel, new front/rear seals and I disassembled/cleaned the OD solenoid, replaced its O rings, replaced the little screen thing, made VERY sure I didn't lose the little steel balls and properly filled with new 20-50 Castrol oil. These overdrives allowed overdrive in both third and fourth gears. I use mine like a 5th gear, but just flick the switch to remove the overdrive at about 30 mph, should I also use the clutch?whats the best method I have been wondering and gotten lots of advise on how to engage and disengage the overdrive correctly. 1971 MG MGB 1971 MG MGB GT "DLP 692J" 1971 I have a newly rebuilt 3 synchro gearbox with overdrive going into my 1966 MGB Roadster right now. It felt like the OD was cutting in and out repeatedly. myself to engineer some sort of lockout so that once I have dropped down below 3rd the OD stays off until I re Mar 5, 2017 · I have a 1974 MGB-GT. slow to engage the overdrive under more than a light throttle load, and worse as the oil warmed up. Fluid level is good, so I assumed it was electrical. I noticed that the OD was a little slow to engage . Very early blue label units allowed overdrive in both third and fourth gears. What is the optimal RPM to shift 1st, 2nd, 3rd, 4th and the coveted Overdrive?! [ In your opinions, of course ] Is there any detriment to shifting too high in the RPM Range in various gears? Like: * pressure plate, T. Changed that switch, but overdrive still does not work at all. csn cause overdrive engagement problems. Feb 4, 2025 · I have had trouble with the black label overdrive for a while now. Dec 11, 2022 · Following a service of my overdrive and a ‘gearbox oil-change’ I’m now getting a significant oil leak on my gearbox. The manual that came with the car also advises against engaging reverse in overdrive, but it does not say It is also likely to be very difficult to take out the gearbox/overdrive unit without taking the engine out as the overdrive itself is partly over the fixed crossmember. I've been reluctant to look hard at one for fear that I would buy it and never get it installed. The later models (post-77) If you do not have overdrive fitted to your 1968-76 MGB, you can use the overdrive switch to turn the fuel pump off and on. Lost use of my over drive on the way to the labor day run. 1958 MG MGA For some time my overdrive on my 1980 MGB was stubborn and would not engage. Find the fuel pump wire On a recent long trip in my '72 MGB roadster I noticed that the overdrive was sometimes slow to disengage after the car had been running at highway speed in overdrive for a long time. LH blue label units were used from 75/76 through the end of production. It's up on jack stands in the garage and I am going through all of the steps to recommission this car after pulling the broken transmission out and installing this rebuilt unit that I had built for the '67 GT I am still building. the 1971 MGB Tourer and GT Handbook wrote:The overdrive unit, controlled by a switch on the steering-column, provides a higher driving ratio for use with third or fourth gear. Overdrive slow to engage. And, are you sure you have the correct oil viscosity in there, and not gear lube? Had slow-engage/disengage issues, and topping off the oil did the trick. com. In overdrive – overdrive freewheels on deceleration: In this condition, the MGB will accelerate and run at constant speed. Non-Overdrive Benefits? Started by Fanch00; It is also likely to be very difficult to take out the gearbox/overdrive unit without taking the engine out as the overdrive itself is partly over the fixed crossmember. Henderson. I rarely use it in 3rd because I'm rarely going that slow Blue label signifies rubber bumper (1975 to 1980) LH MGB overdrive - DAM1362E; Red label signifies MGB GT V8 LH overdrive - 22B687E; Green label signifies MGC LH overdrive - 22B397E; An LH Overdrive viewed My 70 MGB has electric overdrive which recently has become sluggish in engaging. The other thing you can try is to disconnect the bullet connector from the wire going to the overdrive solenoid and rig up a temporary wire and switch, from the cockpit down through the gearstick hole, and directly to the solenoid. Topic List Forum List (black lining)). It seems silly to be clutching if I don't need to. Hooked up 12 volt test light and found that 3/4 gearbox switch did not always engage OD. Top. Overdrive became available on the MGB in January, 1963. My overdrive had always been slow to engage and disengage once the oil had warmed up. The overdrive only works on 3rd & 4th gear, and can't inadvertently engage OD in 1st & 2nd or reverse gears, I have left the OD in by mistake a few times and reversed, Jul 10, 2014 · This may provide more positive engagement of the overdrive, and will provide proof that the switch needs adjustment. I suspected either a weak solenoid, wear in the O rings in the plunger, or a poor electrical connection somewhere. Sign In Create Account. Another prime target. When engaging (or disengaging) overdrive, do I need to depress the clutch or not? I generally do use the clutch, but if I don't it seems to shift fine. 457 Solving a problem with an LH overdrive cycling in and out A fault experienced by some MGB and V8 enthusiasts with a Laycock LH overdrive unit is that when the multi-function stalk switch has been operated to engage overdrive, the overdrive then begins to cycle in and out - engaged and disengaged and engaged again - and continues to do so as the car is driven at a steady the overdrive worked impeccably but i had a leak from the filter cover plate. bearing, clutch disk 1952 MGTD - 1969 MGC - 1972 MGB - 1974&1/2 MGB/GT V8 conversion - 1978 MGB mowog1@aol. I've found after the winter lay up the overdrive can be initially slow to disengage so I don't use it until the gearbox oil has warmed up. Maybe a recon box and overdrive and new clutch in the ol’gal. Is there any adjustments to help this matter?? Thanks Norm West Midlands, England, UK . The car has been returned to the repairer for it's 500-mile re-tightening of the cylinder head, along with reviewing the attendant OD issue, which, by the way, was never apparent prior to the engine Did the overdrive disengage when you switched it off on the gear lever switch or did you leave the switch on and did you replace the inhibitor switch? It would be worth reading the MGB overdrive thread. If the problems remain then you are going to need to pull the engine and gearbox. I’m a helicopter Oct 21, 2012 · Fitted Overdrive warning to my B , Just posting pictures to see what you guys think . It engages and disengages instantly while the the transmission is in gear and the car is moving. 1958 MG MGA 1970 MG MGB. Per the picture attached, I plan on removing plate #16 and Fill to proper level,take ride engage od,let sit on level ground Have finally got my Sebring replica on the road, lots of tiny problems. When you engage the overdrive, power goes to Hi, I have a 1965 Mk1 MGB. Topic Creator (OP) Apr 4, 2014 07:38 AM. The overdrive relay clicks but that is all that happens. My 70 MGB has electric overdrive which recently has become sluggish in engaging. So the oil has been drained again, and refilled I have a 1976 mgb, with overdrive, and the unit is slipping. Written by Tom Sotomayor – 2016-01-04 How-To Library > Transmission, The speedometer will read 22% slow. Get a "converter" box from a speedometer shop; Send When I bought my 1980 MGB GT a few years back, the guy selling it said "Don't put it in reverse with the overdrive switched on - you may get away with it once, but not twice". one of which is that the overdrive takes 3-4 seconds to engage. On a recent long trip in my '72 MGB roadster I noticed that the overdrive was sometimes slow to disengage after the car had been running at highway speed in overdrive for a long time. Author: A. My O/D would not engage until I drove the car about 15 miles or so. If I try reversing the next day it works again. It shows how 'gearing' occurs from the different distances from the centre of the gear to the tip of the teeth on each wheel, i. Typically I engage the overdrive in 4th gear at 2000rpm. What do you think? Second Man, I read a ton about installing overdrive transmissions into MGBs. Forums. opxumd lpguct ltds apbdsswbf vaanucp vwzj mxzv wnq lsvlhj wzse vzojtn qtfsc jeiaaj hdki ahk