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Old 01-20-2011, 02:27 PM   #1
spdracr00
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Red

Default signs of a bad main bearing

ok, so i got a free 99 forester with a big hole in the block. got a ej251 longblock to replace it. the "issue" with the new longblock was rod knock/bearing going out. as i was pulling the engine apart I noticed the timing belt tensioner was bad, after doing some searching when that goes bad it makes a tapping sound very similar to rod knock. even gets worse as your rpm's increase. so fast forward to now, pulled the oil pan and there is a thin layer of sludge but ZERO metal. even if i rub the sludge between my fingers, smooth and no metal. inside the shortblock is totally clean as well, no metal anywhere, not in the corners, not in the oil tubes, no where. so other than pulling the block apart is there anyway to test for bad bearings? here are some pics of the internals if that helps.








Thanks for any info you guys might have. got the long block for dirt cheap so if i install it i'm only out headgaskets and my time.
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Old 01-20-2011, 02:49 PM   #2
T Wrex--OH
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You could try cutting open the oil filter if you still have it, and checking for bearing bits in there.
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Old 01-20-2011, 02:53 PM   #3
BAN SUVS
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I'd go ahead and split the case, since that's easier to do than just slapping the motor in there and cranking it up to see if it knocks. On the other hand, just putting it in has the advantage of not requiring further work if the bearings turn out to be okay.

You should probably at least pull the heads to check for valve damage if there's timing belt shenanigans going on, and to pre-emptively do the HGs.
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Old 01-20-2011, 03:06 PM   #4
spdracr00
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heads are pulled, valves are all good. the engine is in really great shape which is why i'm gonna take the risk. well, after i add the cams.
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Old 01-20-2011, 11:37 PM   #5
williaty
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With no metal anywhere, I'd be inclined to toss it in and see what happens.

Just splitting it to open it will cost you a bit of money in terms of gaskets that need replacing, sealer, tools, etc, not to mention a good bit of your time. If you had metal in the pan, I'd say consider it dead. With a clean pan and a reasonable other explanation for the noise, start it up and see what happens.

The worse it can do is explode.
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Old 01-21-2011, 10:26 AM   #6
GEE-OTTO
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No shavings in the oil......I wouldn't split a sealed a block unless it was for learning purposes.
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Old 01-21-2011, 12:54 PM   #7
renob123
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Quote:
Originally Posted by spdracr00 View Post
well, after i add the cams.
This times infinity

Jacob
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