syoo8

Mike-- I'm also doing a TB/WP job on my '87.... I'll swing by whenever you'd like!

mkriete

Thanks Scott. I'm traveling this week, but I plan to work on the car Saturday afternoon. I'll contact you.

SeanR

Also, the washer on the front of your crank is on backwards, this is going to push the belt backwards.

mkriete

Thanks!

syoo8

Matt-- in your pictures, it looks to me that #10 (the roller 928 105 571 00) is backwards?

Mrmerlin

Nice Catch Sean

mkriete

Roger, I received the new bushings and bolt. Thanks for getting them to me. I'm afraid I still have a strange Frankencar, though.
Scott came by and looked at the setup and agreed that the tensioner is still too loose. The three pictures below show the tensioner arm bolt loose, with the bushing spread, and with the bolt pushed to one side.
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-
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Also note the wear on the side of the the arm, I presume from the belt.
My tensioner is part #928 105 540 4R. We found only one reference to this part:
https://rennlist.com/forums/928-forum/835962-928-s2-carrier-for-tension-roller.html
Experts, I suspect I need to just replace the tensioner arm with 928 105 540 05 (please confirm). Before I do so, is there anything else I'm missing.

Mrmerlin

That bushing and bolt wont work with this tensioner arm.

This arm looks to have the bolt hole for the tensioner warning pin anchor,
looks like someone updated some of these parts.

syoo8

Matt, hopefully Mark Anderson will have a tensioner arm that will be compatible with the bolts you received from Roger.

Congratulations on fabricating your own custom wire harness. Extremely impressive work, Matt!

Dave Balz

That was some excellent detective work. I'm impressed. I have an '88 928 S4 that I bought last summer. Only has about 35k miles. Beautiful car. The seller says his mechanic installed new timing belt just prior to sale. I have about 2,000 miles on it and feel like I should check belt tension. A little intimidated by by my water cooled v8. I have spent the last 30 years on my air cooled flat six, which I know my way around. Everything I read about 928 timing belt tells me I'd better keep it adjusted right. I'm in Jax FL and don't have much 928 network here in the PCA. Need some advice and possibly need to purchase a P9201. What's a rookie to do???? Any advice appreciated.

Dave Balz

garage buddies.<br/>

Dave Balz

sorry, I'm new, so I don't know the protocol for posting questions. apologies if I interrupted a thread. Should I have posted my inquiry as a fresh question. Newbie mistakes<

Not sure why my photo double posted (oops)

Mrmerlin

get a Kempf tool.
For belt tension check.

Check it cold, with the engine at TDC ,
The S4 will be set to the top of the window
The 16V will be set to the low side of the window.

Turn the crank 2 times and recheck you work.

NOTE to use the 9201 tool the front timing cover must come off,
So this is a better tool to use when initially fitting the belt.

NOTE with the kempf tool only the passenger side cam cover comes off

Balz

I've read a few contrasting points of view about kemph vs 9201. Is there any definitive documentation on benefits/accuracy: measururement repeatability? Or is it by personal anecdotal experience? I don't drive hard, so is the accuracy as critical as track use?

Thoughts?

Mrmerlin

its a timing belt ,
if the kempf tool is used and the tension is checked as suggested,
then you will not have any belt tension issues.

Both tools accomplish the same end,
the 9201 requires more of the belt to be exposed to get a reading.

NOTE after setting and checking,
turn the crank two times and check it again looking for repeatably, readjust if necessary
NOTE in a perfect world you would have both tools one when you fit the new belt to set tension,
then check it with the Kempf,

Then the other to reset the tension after the 1500 miles service.
only the right cam cover needs to be removed with this tool.