2004 996 C2 Engine quit
06-22-2018, 02:39 PM
#33
Burning Brakes
The smaller particles look like failing IMS bearing, but then you have that smiley piece that is much bigger; perhaps big end bearing or crank thrust bearing? any milkshake?
07-01-2018, 09:16 AM
#36
Rennlist Member
Was this car tracked at all? What led up to the failure?
07-06-2018, 02:23 PM
#37
Track Day
Thread Starter
Join Date: May 2018
Location: Florida
Posts: 20
Likes: 0
Received 0 Likes
on
0 Posts
I've only had the car for about 6 months but the PO told me he never tracked it. The only indication prior to the failure was a light rattle sound at mid rpms. The IMS had just been replaced with a pelican parts bearing about 1000 miles before.
I've elected to replace the engine with a used one from a wrecked car. It came of a 2002 C4 with tiptronic and 61000 miles. My mechanic just received the engine and called to tell me it's a M97 motor- but I'm guessing it's really just a newer M96 with the larger non-replaceable IMS bearing. I had asked him to put in a LN Engineering ceramic bearing (when we though it was an original M96).
I've elected to replace the engine with a used one from a wrecked car. It came of a 2002 C4 with tiptronic and 61000 miles. My mechanic just received the engine and called to tell me it's a M97 motor- but I'm guessing it's really just a newer M96 with the larger non-replaceable IMS bearing. I had asked him to put in a LN Engineering ceramic bearing (when we though it was an original M96).
07-06-2018, 02:56 PM
#38
Rennlist Member
I don't like when owners put in an IMS bearing and then immediately sell the car. It's a red flag in my book, especially if they went the cheap route on the Pelican kit. I've seen people specifically use that one since it has a sealed bearing, to try to limit debris from damaging the new bearing. The fact that you found debris in the engine points to possibly prior damage, perhaps from a failed IMS. But who knows for sure.
Do you have a receipt for who installed the IMS bearing - perhaps you can ask them about what was the condition of the original bearing or any other info about the history of the car (and engine)?
If it is an 06-08 non-serviceable M97 bearing, just have the grease seal pulled as preventative maintenance:
http://imsretrofit.com/my06-08/
Do you have a receipt for who installed the IMS bearing - perhaps you can ask them about what was the condition of the original bearing or any other info about the history of the car (and engine)?
If it is an 06-08 non-serviceable M97 bearing, just have the grease seal pulled as preventative maintenance:
http://imsretrofit.com/my06-08/
07-06-2018, 10:40 PM
#39
Track Day
Thread Starter
Join Date: May 2018
Location: Florida
Posts: 20
Likes: 0
Received 0 Likes
on
0 Posts
I installed the Pelican bearing myself, the original one looked to be in perfect condition. Previous mechanic reports indicated rough running due to a split oil filler tube and a potentially failed front crank seal. I found an additional air leak at one of the corrugated hoses connecting the passenger side head to the AOS. Up until the engine failed it was running pretty well.
07-07-2018, 02:38 PM
#40
Rennlist Member
Be sure to bore scope the cylinders and pull the oil pan before you install the used replacement engine. You don't want any surprises.
For bore scoping, you'll need to go through the sump with each piston at TDC to be able to inspect the bottoms of the bore. That's where scoring starts.
For bore scoping, you'll need to go through the sump with each piston at TDC to be able to inspect the bottoms of the bore. That's where scoring starts.
07-07-2018, 02:58 PM
#41
Rennlist Member
I realize you’ve moved on to another motor, but wondering if you decided to try to pinpoint what ultimately happened? You state previous mechanic reported a possible crank seal issue, any clue what that was based on? Lowpure mentioned the image you posted looked like his after a crank bearing failure. Flat6 mentioned it didn’t look like an ims failure given there is no glitter present. Did you simply change the ims as PM or was there a catalyst for the change. Your thought are much appreciated in helping to further document another M96 failure.
07-09-2018, 04:40 AM
#42
Track Day
Thread Starter
Join Date: May 2018
Location: Florida
Posts: 20
Likes: 0
Received 0 Likes
on
0 Posts
I changed the ims and rms as preventative maintenance. The rms actually looked ok but was of the old design. The aos flange was leaking slightly but the bearing looked perfect after 90k. I think the mechanic notes about a potential front crank seal were due to a worn serpentine belt that snapped and got threads wrapped around the pulleys, etc on the font of the motor. That, and a cracked oil filler tube resulted in an oily mess around the front (rear facing) of the engine. The front crank seal turned out to be fine.
I’ll ask my mechanic to scope the cylinders of the replacement engine before install and check the pan for debris. I do plan on opening up the failed engine to determine the actual cause of the failure if it isn’t readily apparent once it’s removed. I’m interested in rebuilding it as a spare if possible.
I’ll ask my mechanic to scope the cylinders of the replacement engine before install and check the pan for debris. I do plan on opening up the failed engine to determine the actual cause of the failure if it isn’t readily apparent once it’s removed. I’m interested in rebuilding it as a spare if possible.
10-08-2019, 02:49 AM
#43
1st Gear
Join Date: Oct 2019
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
10-08-2019, 03:45 AM
#44
Rennlist Member
Not good and DON'T START it again. Many have described this sound when the IMSB failed.
