I have a 80 633csi with 100kmiles on it. I just bought it and the prior
original owner told me the tappets could be adjusted. He never did it
cause the mechanic told him it was not necessary. Never done.
I took the car into the dealer to have the work done (inexpensive)
and the tappets still make noise after warmed up. Is this normal??
It's not real loud but I wouldn't think that one shouldn't hear much of
anything. from under the valve cover if they're adjusted correctly. Am
I too picky?? Also, they adjusted the tappets with the engine cold.
Any thoughts, Fred.
Did they adjust the valves? After having them adjusted they'll probably
quiet down a bit, but would get noisy again in a short while. BMW
engines tend to be pretty clattery, but usually when they warm up they
smooth out. I know with these engines there's an issue with failure to
get oil to the cam, but I don't remember the specifics. (Perhaps
someone else can chime in here?) But if a mechanic looked at it,
hopefully he'd have noticed. Did they give you an idea of how the cam
looks as far as wear? What grade of oil are you using? What brand
filter? It sounds silly, but with Audi's for instance, if you use a
Fram filter (or something else off the shelf) the 12v 6 will clatter
pretty badly, but if you put an Audi filter in it quiets down.
I know the E32 735i had a bad banjo bolt design, which would sometimes fail
to deliver oil to the front-most cam lobe. The retrofit is cheap and easy,
with the factory-recommended updated banjo bolt replacement. I'm not sure
if the varient of the motor in a 1980 633 would have that issue also, or
I speak from *much* experience here as I have bought very cheaply over a
dozen M30 engined E23/28s with this problem. New cam and followers (and
modified bolts from the BMW dealer) and all is well with the world.
But yes, I too had cracks in the rearmost ex-manifold but these got quiter
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