[Guest]

Hi Guys,
Need a little advice here.
Got a '95 M900 with 33,000 kms on the clock. Last service at 30K kms the shop said they'd checked my service history and decided my valves didn't need checking (...?!!!).
Anyhow, on Sunday I decided to check the valve clearances (inlet openers 0.05mm and 0.08mm,exh openers both 0.08mm,inlet closers 0.1mm and 0.04mm, exh closers 0.07mm and 0.02mm) . These seem out of spec compared with the manual, however what intrigued me was I set the cambelt timing marks to the little blips on the covers (and also on the crank body mark) and had a look in the timing window on the left hand cover....no little timing marks in site !!! ???
I thought I would see at least one set of timing marks here, if all is correct ? (It should align with the horizontal cylinder TDC timing marks shouldn't it ?).
Any suggestions as to what may be amiss, or whether I'm doing something wrong here'd be appreciated ! :-/
Thanks guys,
....Simon

 

[krista_k]

hi Simon,

good on you for taking matters into your own hands. i think it is careless (if not wreckless) for a shop to not at least check the clearances. especially as this typically means they check the belts, too.

with the belt timing marks lined up to their respective marks, there should be a mark in the timing window on the left side of the engine. if not, try moving the crankshaft forward and backward a little to look for it... note that the timing marks for the belts are not always "perfectly" aligned, and due to the spacing of the teeth, this is not an issue.

fwiw, i don't like to see exhaust closers get past .05mm. the openers should be .003"~.004" (or .07~.1mm) and the exhaust openers .004"~.005" (.1~.125mm).

good luck,
chris

 

[Guest]

Thanks for the assistance Chris.
I will need to re-check this cam alignment, as I seem to recall the marks were around 90 degrees out when I had a timing mark (TDC) set in the window...maybe I'd set this to the TDC mark for the vertical cylinder ??? (If I recall there are two sets of TDC marks right ? One set being three marks - advanced timing, idle timing, and close afterwards, TDC ???)
Cheers,
...Simon :-/

 

[krista_k]

hi, yes, there are 2 timing marks, 90 degrees apart, and the belts are timed on "the first set" as i recall.

chris

 

[jblouch]

Chris is correct. When the belt marks are all lined up, the horizonal cylinder is at or near TDC and you should be able to see the timing marks in the window.