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KNS KNS is offline
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Join Date: Jan 2004
Location: Docking Bay 94
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Cracked Cylinders

It's great to see that LN Engineering has come out with fixes for the IMS and its problems. While researching 996s I've also seen reports of cracked cylinders. How does one know during a PPI that there may be potential problem with the cylinders?

If one's 996 suffers from this is there a permanent fix (during a rebuild I would assume) like the IMS upgrade? The IMS and RMS problems seem to have been solved.. I hope. I'm taking a look at the 996 but I want to know what I'm getting into.

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Old 07-18-2011, 07:34 AM
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LN engineering has the cracked cylinder cure also. It is mostly the 3.4 engines that have this problem (99-01) a cylinder leakdown test during PPI will help foresee problems like this.
Old 07-18-2011, 09:24 AM
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I have seen sooooo many 996 with over 100K miles with original engines (and IMS), that I do not get concerned about it. I understand engines have failed (D-chunk, IMS, or whatever else), but it seems that those that have failed get a lot more promotion than the majority (those that have over 100K miles and still running with original IMS).
Byprodriver is correct, LN has the cylinder inserts to rebuild engines.
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'99 996 Convertible
'94 MB E420 (Gone)
'86 MB 300E (Gone)
'87 MGM (Gone)
Old 07-27-2011, 08:58 AM
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Pesuazo, Thanks for your comments about the soundness and reliability of the 996.


Last edited by dennish; 07-30-2011 at 08:22 AM..
Old 07-29-2011, 10:09 AM
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