ChasR
RR Helper
motivation
Posts: 10,241
Club RR Member Number: 170
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Nov 15, 2010 21:05:24 GMT
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Well, I hope they are!
Right, whilst some issues I have got to the bottom of the MGB, others I am still wondering about.
The first issue I have cracked is its random smoking habit. The Brake master cylinder is leaking oil into the servo and then sucking it into the engine. This is not surprising considering the Brake MC is the only cylinder not to have been refurbished or replaced on the car (unlike the clutch items and rear slave cylinders (front calipers are stainless sleeved items)).
I have a new Master cylinder ready (it only started once I bled the brakes), but before I got about putting it on, do I need to get a seal to fit in between the cylinder and the servo like on most cars? According to the Haynes, and Parts catalogues there seems to be no mention of this...
Second of all is the overdrive problem. It is on a 500 mile old overdrive and I think the gearbox was reconditioned before I bought the car (it is certainly a quiet and slick shifter). The problem I have is with the Overdrive part. Whilst it goes in and out seamlessly, now and again (more notable from when I came back from the FUCEM meet) it will come in and out despite being engaged, before finally staying out. Yet if I leave the car a while and drive it again, the OD will work. Would you go chasing electrical faults or does it seem more like an oil problem?
Ta.
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Last Edit: Nov 15, 2010 21:06:27 GMT by ChasR
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Siert
Posted a lot
Posts: 1,105
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Nov 15, 2010 21:08:17 GMT
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I don't know much about these but I think the solenoid is quite often the source of problems. My dad fixed his completely non-functional MGB overdrive by simply cleaning the solenoid.
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Nov 15, 2010 21:28:25 GMT
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Not sure how similar the MG overdrive is to the Triumph overdrive but, if you gave those symptoms on a Triumph forum, they would probably tell you to check your gearbox oil level.
That is often at the route of problems once the oil is warm. Then check your connections on the solenoid, make sure nothing is loose, or shorting, even inside the gearlever.
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Last Edit: Nov 15, 2010 21:29:25 GMT by alolympic
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ChasR
RR Helper
motivation
Posts: 10,241
Club RR Member Number: 170
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Nov 17, 2010 11:13:42 GMT
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The Overdrive is similar to the Triumph items I understand (they were both made by Laycock). I was thinking the oil but was wondering if something more obvious stood out to your trained souls.
Off to get some 20W50 I guess for the box and engine!
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Nathan
Club Retro Rides Member
Posts: 5,649
Club RR Member Number: 1
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Nov 17, 2010 12:06:35 GMT
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Have you changed the OD filter
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purplevanman
Posted a lot
Way too orangey for crows
Posts: 3,830
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Nov 17, 2010 14:36:55 GMT
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I have a new Master cylinder ready (it only started once I bled the brakes), but before I got about putting it on, do I need to get a seal to fit in between the cylinder and the servo like on most cars? According to the Haynes, and Parts catalogues there seems to be no mention of this... Ta. This is not uncommon as when bleeding the brakes the piston travels further down the cylinder than in normal use so any corrosion at the unused far end can damage the piston seal. sorry can't help on the rest :/ |
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Welder, fabricator, general resto work
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Nov 17, 2010 17:54:10 GMT
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I don't know much about these but I think the solenoid is quite often the source of problems. My dad fixed his completely non-functional MGB overdrive by simply cleaning the solenoid. +1 The problems are usually electrical. Oil level is critical, as they run off gearbox oil pressure, however I've run the o/d box in my Amazon so low that it needed more oil than the entire capacity of the non od box, & the o/d worked fine (box has since been rebuilt...). There are some documents here relating to trouble shooting problems with overdrives (scroll down the page). |
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Last Edit: Nov 17, 2010 17:54:36 GMT by Paul H
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Nov 17, 2010 17:59:07 GMT
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Oh, and if playing with the electrics, make sure that the reverse inhibitor cut-out thingy is working correctly. O/d + reverse = dead o/d  |
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ChasR
RR Helper
motivation
Posts: 10,241
Club RR Member Number: 170
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Nov 20, 2010 19:46:18 GMT
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Have you changed the OD filter I have not, although AFAIK is it not a gauze that you wash out in petrol rather than a renewable filter? Although I guess they can deterioate. I have a new Master cylinder ready (it only started once I bled the brakes), but before I got about putting it on, do I need to get a seal to fit in between the cylinder and the servo like on most cars? According to the Haynes, and Parts catalogues there seems to be no mention of this... Ta. This is not uncommon as when bleeding the brakes the piston travels further down the cylinder than in normal use so any corrosion at the unused far end can damage the piston seal. sorry can't help on the rest :/ I did wonder whether this is how the master cylinder died TBH. It was one reason why I ordered a new master cylinder thinking the bore could be scored badly. I don't know much about these but I think the solenoid is quite often the source of problems. My dad fixed his completely non-functional MGB overdrive by simply cleaning the solenoid. +1 The problems are usually electrical. Oil level is critical, as they run off gearbox oil pressure, however I've run the o/d box in my Amazon so low that it needed more oil than the entire capacity of the non od box, & the o/d worked fine (box has since been rebuilt...). There are some documents here relating to trouble shooting problems with overdrives (scroll down the page). Oil I will be checking in the coming weeks (I already have some fresh 20W50 for the box and engine from today), and with Nathan's advice I will probably change the OD filter whilst I am there. Cheers for that link. It certainly gives me something to work through regarding the OD. AFAIK, the inhibitor works in my gearbox (OD only works in 3rd and 4th, I dare not try the car with OD in reverse!). |
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