Keeping the timing from skipping
10-27-2012, 01:47 PM
#1
RL Community Team
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Keeping the timing from skipping
Hi There;
I've run an initial search, but haven't had much luck in finding anything comprehensive (my imagination is weak, so photos are a must) on the best way to secure the exhaust cams and/or chains in position when pulling the IMS bearing. I've looked at Wayne's Set Screw option on Pelican's guide, and have LN's cam locking device, but I'm apparently unable to position the cam lock and pin correctly (which I discovered whilst removing the flywheel bolts) and I wanted to be sure the set screw process will hold before I go too crazy and pull the chain tensioners. Given this has been the longest maintenance job in my own history of 'I can do that too!' projects, I don't want to rush through what I'd feel is probably one of the more important steps in the process (too many years on the 944 derived engines with the timing belt nightmares.) Apologies if I'm breaking protocol by not spending a large deal of time searching, but I imagine there are some great articles I couldn't find out there that some of you have bookmarked. Thanks! :-)
I've run an initial search, but haven't had much luck in finding anything comprehensive (my imagination is weak, so photos are a must) on the best way to secure the exhaust cams and/or chains in position when pulling the IMS bearing. I've looked at Wayne's Set Screw option on Pelican's guide, and have LN's cam locking device, but I'm apparently unable to position the cam lock and pin correctly (which I discovered whilst removing the flywheel bolts) and I wanted to be sure the set screw process will hold before I go too crazy and pull the chain tensioners. Given this has been the longest maintenance job in my own history of 'I can do that too!' projects, I don't want to rush through what I'd feel is probably one of the more important steps in the process (too many years on the 944 derived engines with the timing belt nightmares.) Apologies if I'm breaking protocol by not spending a large deal of time searching, but I imagine there are some great articles I couldn't find out there that some of you have bookmarked. Thanks! :-)
10-28-2012, 09:39 AM
#2
Burning Brakes
Assuming you have a 986 Boxster just put it on #1 TDC and back the tensioners out but do not remove them. Change out the bearing and screw them back in. No problems.
10-28-2012, 12:52 PM
#3
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Re: Tensions
do I need to pin the intermediate shaft sprocket in place or lock the cams down in addition to just backing them out?
10-28-2012, 01:15 PM
#4
You have the LN cam holding tool. Use it. The slots in the cam ends, where the tool slides in to do the locking, are machined slightly off center. Sounds like you may have your engine at TDC on the exhaust stroke instead of the compression stroke. Rotate the crank another 360* and try the tool again. It is a very tight fit, but definitely will go in.
Check my pic below and verify the position of your cams.
Good luck, let us know how it goes.
Check my pic below and verify the position of your cams.
Good luck, let us know how it goes.
10-28-2012, 11:25 PM
#6
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IMHO, I would not trust just backing out the tensioners... Timing is too important with too much at stake. Use the cam locks from LN. Better safe than sorry... Especially when sorry is a replacement engine.
