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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 cover. 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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  • Similar Content

    • By Domiac
      LN Engineering Retrofit Kit Instructions - Rev 18 Jan 14. state the following:

      Step 6. Lock camshaft in head with tensioner accessed from underside of the engine, closest to flywheel.

      Which head? Challenge is that there exists two tensioners that can (kind of) match to above description.

      When looking towards the flywheel, about 10 inches left from the IMS flange, under the engine, you will find a horizontally aligned tensioner. This should be the IMS chain tensioner and this one is closest to flywheel, however it is not located "in head".

      When looking towards the flywheel, about 15 inches right from the IMS flange, under the engine, you will find a vertically aligned tensioner. This should be the cylinder 1-3 camshaft chain tensioner and it is located beneath bank 1, second closest tensioner to flywheel.

      Now, which one of the banks should I lock? Look again at the instruction text and notice that both are close to flywheel and underside of the engine :-)

      Step 7. Remove the IMS to crankshaft chain tensioner as well as well the chain tensioner on the cylinder head for which you have locked the cam.

      Well, this depends on which bank I locked.

      My pick would be to lock bank 1. After all bank 1 chain is directly coupled with the flywheel side of the IMS. Then remove both tensioners visible on my image.

      My plan is to follow LN's instructions by the book and I do understand that I am solely responsible of the outcome. The only exception is that I'd like to lock all my cams (not only bank 1 but also bank 2), I can fabricate another cam lock tool, I assume this is safe thing to do.

      Would you agree?

      PS. Would be great if next revision would add wording "lock bank 1" instead of "lock camshaft in head with tensioner closest to flywheel"
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