Poll, Condition of my IMS bearing
Hi Everybody,
Ok I've decided to get my IMS bearing replaced with an LN Engineering retrofit. My car is a 2002 base (2.7) manual with 85K Kilometres on the clock (56K miles approx.) I've only just got the car, and it is in great condition with nothing apparently wrong with the engine. There are no funny noises, the engine is strong, and I had a PPI done. However, the previous owner did the bare minimum of oil changes. I've just had it serviced, but the last oil change was about 4 years ago, at about 65K kilometres. Not ideal really. Anyway, please place your bets on what condition my old IMS bearing will be in when I have it replaced on Friday! http://986forum.com/forums/uploads01...1411360840.jpg |
If it's not perfect the engine is already in trouble.
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IMS Bearing
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More Forum clutter.
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Cheers anyway. |
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My IMSB was in perfect shape after 136,000 miles and 89 track days. Instead, lifter failure was caused the engine to fail. Best of luck but odds are very high that if your bearing had a problem, you'd already know it.
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you say the bare minimum of oil changes were done? How many?
Another factor is how often was the car driven. a 12 year old car that saw about 4,500 miles might be good if the mileage came in somewhat frequent and year round trips. Not so great if they came from mostly summer time driving without having the oil changed after the driving season. Did your PPI include a leak down test? That will tell you more (engine wise) than a visual inspection of just the IMS bearing, which really needs to taken apart to see what's doing (by someone who knows what to look for). |
I would bet that it's probably in pretty good shape. I just had the retrofit LN bearing done a couple of days ago. My car is a 2001 2.7 and the previous owner had only done one oil change in 3 years. The car has done 36K miles. Here's the old bearing:
https://lh4.googleusercontent.com/-R...o/IMG_6579.jpg I couldn't find any visible signs of scoring. Yours will probably look the same. However, the seals had leaked and there was no grease left inside, but at least it was well lubed by engine oil. https://lh5.googleusercontent.com/-G...o/IMG_6543.jpg Hope you can post some pics of your old bearing when the job's done. |
If the tube was filled with oil and the seals compromised, then the bearing was at Stage II failure. Looks like it was caught at the perfect time, before wear increased and contaminated the oil supply. Once that happens, the health of the retrofitted bearing is seriously impacted.
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I suppose the grease being washed out could be a 'stage' of failure, but if the bearing has engine oil to lubricate it, whats wrong with being in 'stage 2' failure for 150,000 miles?
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That all depends on how fast the bearing progresses through the phases of destruction and if the bearing was designed for grease oil is a poor substitute. You haven't read much about this issue have you?
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Poll, Condition of my IMS bearing
Considering the DOF fix uses oil to lubricate the bearing, I would think oil as a substitute is just fine
And my point was, the bearing destruction wouldn't progress very quickly if it had oil around it to lubricate it... |
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I'm going to take some pics of the old bearing. Cheers! |
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On the PPI they did a compression test, not a leak down test as far as I know. The compression test has 4 cylinders down 4% and 2 cylinders down 6% which isn't too bad I think. Cheers. |
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One more factoid I forgot to mention, it's only ever had Mobil1 0w40 oil from new. I know there are different opinions again on the best engine oil with some people going for higher viscosity. I know nothing about oil, but my hunch is that you'd be better off with lower viscosity in an IMS bearing with the grease washed out, assuming that the worst wear is happening on engine start up. Having said that, I don't think the longevity of the bearing is likely to be down to one thing. We'll probably never know. Cheers! |
Not bad as it really need to replace.
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Or ignore all of the above and roll the dice. It's kind of like investing in stocks, some people sleep fine others check the computer every 5 minutes. |
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Assuming nothing serious is uncovered on Friday then I'll be reasonably confident about the engine going forward. |
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