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Chain Adjuster.
Genuine Porsche product.

Fits:
Porsche 987 Boxster MKI 2005-08
Porsche 987 Cayman MKI 2005-08
Porsche 997 Carrera MKI 2005-08

Diagram ref no 34

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Guide Rail - Cylinder 1-3.
1 per engine.

Genuine Porsche product.

Fits:
Porsche 986 Boxster 2003-04
Porsche 987 Boxster 2005-08
Porsche 987C Cayman 2006-08
Porsche 996 C2 / C4 / C4S 2000>>
Porsche 997 MKI 2005-08

Click picture for large parts diagram.
Diagram Ref No 33.

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Billet aluminum IMS to crankshaft chain guide / tensioner, replacement for Porsche part no. 99610516554 or 99610516555, to help prevent catastrophic engine failures like this. Shown in the image a comparison of our billet tensioner paddle compared to the cast factory tensioner. Billet construction provides a significantly stronger and more durable product while utilizing OE Porsche wear pad and pressure pin (both of which are included as shown).

Update: We've found the factory plastic pressure pin to not be strong enough, so we've made a billet steel pressure pin against which the chain tensioner actuates to tension the crankshaft to IMS drive chain. This is a return to a style of pressure pin found in very early examples of the M96 engine.

If you choose not to upgrade to this item when your engine is apart, please at least purchase a new one from Porsche rather than re-using the old one, even if it looks fine! We recommend our billet tensioner paddle where vehicle will see track use.

Fits:
Porsche 986 Boxster / Boxster S 1997-04
Porsche 987 Boxster / Boxster S 2005-08
Porsche 987C Cayman / Cayman S 2006-08
Porsche 996 C2 / C4 / C4S 1998-05
Porsche 997 C2 / C4 / C2S / C4S 2005-08 COUPE/CABRIO

Click picture for large parts diagram.
Diagram Ref No 18.