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B52 gearbox
#772946 05/07/19 9:27 pm
Joined: Sep 2017
Posts: 5
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B 52 gearbox works fine,but whine when in third gear.Correct oil used and up to level plug. Chain(s) are correct tension.What is the cause??This is a daily driver, so must go direct to the problem to fix same dayThanks all

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Re: B52 gearbox
matchlessman #772954 05/07/19 10:09 pm
Joined: Aug 2001
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You might need to pay a good doctor to diagnose that one sight unseen !?

Gear pinion teeth could be worn, bush(es) could be worn, dogs may not allow it to be in perfect mesh,
shifter forks might be worn/bent, shaft may not be perfectly straight.
Its in there somewhere...

P.S. What do you call "correct oil" ?
This may be/is a complete diversion, but didn't AMC recommend engine oil, which would be 50 wt ?



Re: B52 gearbox
matchlessman #773016 05/08/19 11:57 am
Joined: Dec 2004
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Whining in 3rd is common to a lot of gearboxes, the gears are running under the heaviest load in third as in fourth the drive is direct as the sleeve gear is locked to the mainshaft and the other gears just spin with no loads. The typical factory fix was to add needle rollers to the shafts replacing the bushes getting rid of most of the bush/shaft clearances, lower cost is to replace the bushes and ream to suit the shafts current size and check over the gears that work in 3rd (that will be layshaft and mainshaft 3rd gears also and the 4th gears (which should have never been called 4th) for wear and fit ti shafts. For a daily runner its a live with it job until you need to overhaul the gearbox unless you have a spare gearbox to get ready for a day of swapping over, even then no guarantees the noise will be lower.

Re: B52 gearbox
matchlessman #773601 05/13/19 9:22 pm
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Someone has mentioned that the bushes inside some of the gears can sometimes move,
and the holes for oil lube become out of line. This can mean that a box with correct oil level
can have some gears short of oil where it matters, worth checking for...


Moderated by  Matchman62 

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