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Old 07-04-2000, 09:23 PM   #1
sw2worn
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Default Crank Wear - Abnormal ?

Background:

My wife and I recently purchased a 95 SW2 before finding this site with all the interesting information regarding the frequency of engine problems (inability to hold oil were it belongs). We decided to go ahead and replace the valve seals, piston rings, timing chain, etc. and keep the car since it drives great and we found it a beter wagon than the Ford option (Escort).


Problem:

I pulled the engine down, leaving the block mounted in the engine bay. Pistons and bores were on the limit but not beyond reuse with new rings. There was a spun #2 rod bearing but the amount of crank wear was slight enough to allow reuse, after cleaning the journal and installing a new rod and bearings. I also pulled down the main bearing caps one at a time to have a look and decide whether to change them also. The center upper main also serves to locate the crankshaft longitudinally in the block and set the end play. The crank thrust surface on the clutch side is worn to the point that the crank is now running against the block bearing saddles. There is a small amount of wear on the #2 (<0.002") and #4 (<0.001") saddles but this appears to be the only result of the thrust bearing and crank surface going away. The crank pulley indicates that this problem came on suddenly. There are two wear marks, 0.050" apart (0.050" is also the current crank end play), where the seal has run on the pulley for considerable amounts of time. The wear at the current crank location is approximately twice as great as that where the crank would have been when new. The car has 74k miles so the pulley seems to indicate that the thrust bearing went about 25k miles and allowed the crank to shift quickly to the current position where it has remained without any significant change for the last 50k miles.


Questions:

I have two questions for anyone out there who has seen this problem before. First, is it common to see this on a car that has not had oil changes at the recommended 3k intervals and may not have always had the correct oil level? Second, can a car with this crank condition continue to run for another 50k miles without an increase in the crank wear rate.


Thanks for any input

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Old 07-05-2000, 07:48 PM   #2
sattech
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Default

I've seen this on cars with VERY POOR oil change histories.I've never had to replace a crank on a car with 3k oil change intervals. If you are asking if you can get by without replacing an excessively worn crank, I wouldn't suggest it.

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