3-Series (E21, E30)Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.
my e30 320i has what seems to be the well documented clunky/jerky gear shifting in 1st 2nd etc. Also sometimes when you accelerate then suddenly let of the gas..clunk. I know this could be alot of different things, from diff bolts, shock mounts, guibo, center support bearing etc etc, or a combination (hope not).
I am going to have a good look at it in a couple of weeks, too busy with work now to find the time. However i was wondering should there be any play in the drive-shaft at all?.. just wondering if its normal to have some movement, or if it should all be lock tight
with the car turned off, handbrake on and parked up i reached underneath and tried to turn the drive-shaft back and forth with my hand and found there was some movement (a few millimetres, not sure exactly but enough to go forth clunk back clunk forth clunk etc). I tried this with the trans in several different gears, and sometimes there was no movement at all, is that how it is suppose to be? however it did not seem gear specific, as i did it a few times in each gear and sometimes it gave different results such as the first time in what i think was 5th gear there was no movement but the second time there was movement
sometimes at low speeds in 1st or second gear putting the clutch in while accelerating lightly can cause a fairly decent clunk sound which jerks the whole car
i also noticed today when i am in reverse (clutch out), if i give it some gas, and then let off the gas this will also cause a clunk sound in the rear, well at least it sounds like its coming from the rear. any ideas?
A block of wood under the diff is okay, but the rear subframe mounts is also a good spot as you mentioned!
Sounds like you could have some play in the diff mounts, the gearbox mounts or the guido could be split.....the guido is the rubber donut shaped thing that connects the prop shaft to the rear of the gearbox, these are easy to change, as are the gearbox mounts. The diff mounts need a little more effort and while you are that far in you may want to look at or change the subframe mounts and perhaps the drive shaft boots as you will be removing most of that!
The other thing to check is the engine mounts, it could be that when you rev the engine, the torque is twisting the engine mounts and if they are soft/worn or broken, you will hear something. Again, these are easy to change.
thanks for the advice so far, i jacked up the rear end and had a good look around.
The guibo has some cracks but i could not see any play. There is probably a little bit of play in the driveline between the gearbox and diff but i could not see anything obvious it all looked pretty tight.
I noticed there seemed to be about a milli metre of play in both of the inner cv joints... is that classed as acceptable or should there be no play at all?
i also noticed a couple of the diff bolts seemed to be loose, i could twist the washers around with my fingers, so i tightened them up with a socket. I dont know how tight they are suppose to be but it looks as though you have to drop the diff down before you can get a torque wrench in their anyway. The car seemed to be a little bit tighter after tightening the diff bolts or maybe i was imagining i will see how it behaves over the next few days
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