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Old 12-08-2019, 01:05 PM   #1
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Need help with Chain Adjuster Removal 987

I'm new to this forum and the Boxster community! I recently bought a used 2005 Porsche 987 Boxster S with 92,000 miles. The previous owners have done the maintenance but did not address the IMS bearing issue.

I have decided to preemptively replace the IMS bearing along with a new clutch kit and the process has been fairly straight forward to where I have so far removed the transmission, clutch/pressure plate/flywheel to expose the IMS. I purchased a Single Row Pro IMS Retrofit kit from LN Engineering and according to their instructions I have to remove all 3 timing chain adjusters (tensioners) after locking both the cams on bank 1-3 at TDC. The crankshaft/IMS timing chain adjuster and 1-3 timing chain adjuster are easy to reach but the 4-6 adjuster is not reachable even with the AC compressor removed (see photos).

It seems the M96.26 (MY 05) engine has a very different water guide housing and AC compressor mount that obstructs access to the chain adjuster.

Has anyone had experience removing the 4-6 bank chain adjuster on a '05 987 Boxster? A more fundamental question might be: do I actually need to remove the 4-6 bank chain adjuster to install the new IMS bearing?

Thanks for reading!




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Old 12-09-2019, 05:22 AM   #2
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Old 12-09-2019, 07:20 AM   #3
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Quote:
Originally Posted by RobT987 View Post
A more fundamental question might be: do I actually need to remove the 4-6 bank chain adjuster to install the new IMS bearing?
Hello Rob,
I believe that first, you have to lock the cams, and then remove the tensioner before you remove the old IMS.
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Old 12-09-2019, 08:21 AM   #4
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Hi Gilles,

You are correct, the 1-3 cyl. bank cams must be locked before removing the tensioners (LN Engineering states that the 1-3 bank lock is sufficient to remove all tensioners and the IMS bearing). I can't figure out how to remove the timing chain tensioner on the 4-6 head. As you can see from the picture I posted, the tensioner is obstructed by what appears to be the lower AC compressor mount and the hydraulic power steering line.

-Rob

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