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Does the 987suffers from IMS and RMS failures like the 986?

eyecandy993

Nurburgring
Joined
22 Jan 2010
Messages
486
Hi fellows, I am jumping from the aircooled section!! A friend of mine has just bought a 987 Boxster MY2006. He thinks he should change the clutch and already bought the parts. I am aware that with the older 986 Boxster 'While you are in there' it is recommended that the RMS and IMS bearings are changed. Since I read that after 2005 the bearings can only be removed if the two halves of the crankcase have to be separated, I was wondering if these bearings are not such an issue with the 987.

Thanks for any help and suggestions.
 
Bore scoring is still an issue - change oil every 6k miles rather than the intervals recommended in the handbook
 
I thought that the later cars were worse for IMS failures than the early cars? Or did the 987 finally get that sorted? Can anyone be sure? :dont know: I'm guessing the engines were revised along the same lines.

Quote from GT4's American IMS Class Action thread

The M96.1 (early Boxster and 996.1 3.4 with dual-row bearing design): less than 1% lifetime failure rate

The M96.2 (later Boxster and 996.2 3.6 with single-row bearing design): 8% lifetime failure rate
 
apw2007 said:
Bore scoring is still an issue - change oil every 6k miles rather than the intervals recommended in the handbook

The 3.4 in the 911 is better in this regard too due to its design meaning that the cylinders are cooled more effectively and evenly. Not sure if or how this translates to the Boxster.
 
rottenbend said:
apw2007 said:
Bore scoring is still an issue - change oil every 6k miles rather than the intervals recommended in the handbook

The 3.4 in the 911 is better in this regard too due to its design meaning that the cylinders are cooled more effectively and evenly. Not sure if or how this translates to the Boxster.

All 986.2 and 987.1 have the poorer cooling, but on the upside, they are less powerful and less torquey.

So only one of the double whammy the 996.2/997.1s have to face.

In that regard, 986.2/987.1 have less chance of bore-scoring than their 911 counterparts.
 
rottenbend said:
I thought that the later cars were worse for IMS failures than the early cars? Or did the 987 finally get that sorted? Can anyone be sure? :dont know: I'm guessing the engines were revised along the same lines.

Quote from GT4's American IMS Class Action thread

The M96.1 (early Boxster and 996.1 3.4 with dual-row bearing design): less than 1% lifetime failure rate

The M96.2 (later Boxster and 996.2 3.6 with single-row bearing design): 8% lifetime failure rate

As stated in my first reply: revisions as 997 (and same issues).

IMS are worse (9x6.1 to 9x6.2)

But this is a 987 thread.

So through brute force and another three revisions, the last 9x7.1 IMS is the best.

But that is feint praise.

Better to get a 9x7.2 with no IMS and perfect cooling again (ideally DFI, but any MA1 will do)
 
Thanks for the input. Will forward the somewhat goodish news. But the question still stands. Since it seems a bigger issue with the way the IMS is attached in the 987, is is worth to change it just 'because you are in there' even if there is no apparent leak or sworf noted on the oil plug?.

Thanks again
 
If it's the last revision, then it can't be changed at clutch change any way.

(Only open-block surgery)
 
GT4 said:
If it's the last revision, then it can't be changed at clutch change any way.

(Only open-block surgery)

Thamks GT4. It's what I wanted to know. :bye:
 

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