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2003 Carrera 2 3.6 - safe??
- Thread starter Sit
- Start date
The 987 3.4 and 996 3.6 both allegedly bore score. I'm not sure either is safer than the other, or how you'd find out. The 987 will have the later, bigger IMS bearing. I've never heard of a 987 d chunking. I though that was the preserve of the early 996 3.4 which is a different engine (albeit of a very similar configuration).
On 911s, the larger IMS bearing came from model year 2006.
This can be found based on the engine number.
For example, on a 997 3.6, numbers up to M96/05 69507475 have the old bearing (shared with the 996 3.6) and numbers M96/05 69507476 onwards has the larger, revised IMS.
Not sure how that works on 987s mind you, as the Cayman came with the 3.4, which was carried over to the Boxster for model year 2007.
This can be found based on the engine number.
For example, on a 997 3.6, numbers up to M96/05 69507475 have the old bearing (shared with the 996 3.6) and numbers M96/05 69507476 onwards has the larger, revised IMS.
Not sure how that works on 987s mind you, as the Cayman came with the 3.4, which was carried over to the Boxster for model year 2007.
You can drive yourself mental with all this. I trawled the internet for months trying to work out which had the least potential for disaster and eventually just gave up, bought something and crossed my fingers.
Risks related to each year/model
996.1 3.4 - d-chunk risk. Bore score and IMS failure less likely
996.2 3.6 - bore scoring and IMS failure. Tips more susceptible due to increased heat
997.1 3.6 - bore scoring almost guaranteed. IMS fine
Safest Boxster was the 2.5 safest cayman is the 2.7... but they're not 911s
That's my take and it's probably wrong. From what I could see the biggest issues with early cars were wear and tear on 18+ year old cars. The engine failures I've read about have been due to some random bearing or tensioner going or a long ignored failing AOS rather than IMS failure.
Risks related to each year/model
996.1 3.4 - d-chunk risk. Bore score and IMS failure less likely
996.2 3.6 - bore scoring and IMS failure. Tips more susceptible due to increased heat
997.1 3.6 - bore scoring almost guaranteed. IMS fine
Safest Boxster was the 2.5 safest cayman is the 2.7... but they're not 911s
That's my take and it's probably wrong. From what I could see the biggest issues with early cars were wear and tear on 18+ year old cars. The engine failures I've read about have been due to some random bearing or tensioner going or a long ignored failing AOS rather than IMS failure.
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