Inside the 3.8 shortblock - TCCoA Forums
 
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post #1 of 6 (permalink) Old 03-01-2007, 04:11 PM Thread Starter
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Inside the 3.8 shortblock

So I have the engine out and heads off and am in need of a little guidance. The HG's blew, and some coolant got into the oil, no surprise. I have the oil pan off, so without taking anything apart in the bottom end what should I look for as far as warning signs or damage from the coolant? I am not prepaired to do a rebuild now and need the engine to last another year or two before I do it. Also, I want to flush out any coolant or residue from the block, and was planning on pouring oil down through the lifter valley and let it run out the bottom and change the oil after 100 or so miles of running. And any recommendations on cleaning the carbon deposits off the pistons and heads? Gunk doesn't seem to do any good, and I am scared to put oven cleaner of it, especially the aluminum.
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post #2 of 6 (permalink) Old 03-01-2007, 08:06 PM
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Rod bearings seem to go more often than not in these motors.
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post #3 of 6 (permalink) Old 03-02-2007, 10:10 AM
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its not that hard to replace bearings once the shortblock is out. find a buddy that knows what he is doing, round up a few guys, rent an engine crane (~$50), and take an hour to pull the engine. you already have most of it apart it seems like. you can replace the bearings in about a day. the best way to flush out a block is to have it hot tanked by a machine shop. the shop can also clean up your heads. better get them milled and have them do a complete valve job. a brass wire wheel on a drill will clean off piston tops.

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post #4 of 6 (permalink) Old 03-03-2007, 12:57 PM
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I wouldn't even wait 100 miles to change the filter, I'd do it like a new motor break in. Run the motor for a half hour (but since it's not a new motor, maybe just drive it really gently for 20 minutes) with new oil and a filter, then come home and change it. Then give it another couple hundred miles and change it again. I would think it would be most important to do the initial change to make sure you get as much junk out of there as possible right away.

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1994 Super Coupe ('93 5.0L swap), 1990 Tbird 3.8L, 1982 Honda CB900F, 1972 F-100 SportCustom 4x4, 1970 Chevy Custom Camper / 20
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post #5 of 6 (permalink) Old 03-03-2007, 02:05 PM Thread Starter
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I already have the shortblock out. I want to do the bearings, but am kinda scared to without machining the crank.
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post #6 of 6 (permalink) Old 03-04-2007, 12:05 PM
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then have a machine shop check the crank.

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