Jeep runs like crap, aluminum build up on cylinder walls
11-08-2010, 09:20 AM
#46
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Year: 1987
Model: Cherokee
Engine: 4.0
that's wrong. get off the forum if you're gonna give out that type of mis-information.
anyways, OP...when you torqued the head down, did you follow torquing procedure in the manual?
11-08-2010, 10:57 AM
#47
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Year: 1996
Model: Cherokee
Engine: 4.0 ho
Removed the built up aluminum on the cyl walls very carefulls with a drill and a cloth-wheel with sandpaper first. The hone came out very good. Mic'd the cyl walls and all are still within specs, taper is good, bore is fine.
Three of the pistons are bad, but im going to replace all of them, set of rings, maybe lifters, all gaskets and seals, and hell i might even reuse the rod bearings the things are like brand new still.
I doubt any damage got to the crankcase area, all of the aluminum was stuck near the tops of the cyl walls, and the aluminum missing from the pistons were all above the bottom piston ring, so I dont see how it really could have made its way down into the crankcase.
As for the lifters, i know its important to match up each lifter with where it came from on the block, and i did. BUT stupid me kicked the box i had them all lined up in by mistake. Is it ok to reuse in wrong order? Lifters have no wear on them. Motor had 93k on it btw.
Three of the pistons are bad, but im going to replace all of them, set of rings, maybe lifters, all gaskets and seals, and hell i might even reuse the rod bearings the things are like brand new still.
I doubt any damage got to the crankcase area, all of the aluminum was stuck near the tops of the cyl walls, and the aluminum missing from the pistons were all above the bottom piston ring, so I dont see how it really could have made its way down into the crankcase.
As for the lifters, i know its important to match up each lifter with where it came from on the block, and i did. BUT stupid me kicked the box i had them all lined up in by mistake. Is it ok to reuse in wrong order? Lifters have no wear on them. Motor had 93k on it btw.
, ive been told that the only lifters it doesn't matter on is roller. i'm a mechanic for a living and i wouldn't use them again after not having them in order, too much liability there
11-10-2010, 10:22 AM
#48
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Model: Cherokee
I didnt know you could use the previous generations... I thought the holes for the accessories changed
11-10-2010, 10:30 AM
#49
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Im guessing your talking about my orginal question of why it was running fine before and now running like crap? Well i think i've come up with a hypothesis for this one. The old headgasket was blown between cyl 2-3 and 3-4. I'm guessing now that the head was sealing correctly with the new gasket, its not sharing the same pressures between the cylinders like it used to before, and thus = running crappy. For whatever reason, when it overheated it seems the motor may have wanted to equalize pressure between the cylinders, and ran OK when it was like that.
Again, just a theory... guess it doesnt really matter now anyways though ha.
I'm torn on what to do about these lifters though 50% say ok to reuse and another 50% have gotten damage to their cams, from what i gather from asking around both in person and on the forums..
11-10-2010, 10:32 AM
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i tried to reuse some lifters that were mixed up once on a small block chevrolet, don't know if this caused it but 3 of the lifters were ate up in no time and had a flat cam , ive been told that the only lifters it doesn't matter on is roller. i'm a mechanic for a living and i wouldn't use them again after not having them in order, too much liability there
, ive been told that the only lifters it doesn't matter on is roller. i'm a mechanic for a living and i wouldn't use them again after not having them in order, too much liability there
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