I think it's time to pull it and get everything checked out or redone. You did all you could, but someone messed up.
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I think so...
Is it possible to pull the pistons from the bottom?Comment
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I don't remember if the pistons can be pulled from the bottom once the crank is out. But I don't think you could get them back in from the bottom as I suspect you could not get a ring compressor on.Originally posted by EyExR View PostThe car makes it possible, but the driver makes it happen.
Jim Levie, Huntsville, ALComment
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Poor you.
And like FLG said, "You did all you could, but someone messed up."Originally posted by EyExR View Post
I've read your three "How to do this impossible job" threads. You can do the pull, figure, fix and replace faster than most people on this board, I'd bet. It sucks very hard that you have to pull your engine and figure who messed up where, but I suspect the time has come.
I'm quite willing to join the posse. I've always wanted to be in a posse.
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Ha! ThanksOriginally posted by SubDad View PostAnd like FLG said, "You did all you could, but someone messed up."
I've read your three "How to do this impossible job" threads. You can do the pull, figure, fix and replace faster than most people on this board, I'd bet. It sucks very hard that you have to pull your engine and figure who messed up where, but I suspect the time has come.
I'm quite willing to join the posse. I've always wanted to be in a posse.
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Well, I gave it another try. This time I put a bunch of oil down each cylinder and hand turned the crank several times. It fired up! Then died... and wouldn't start again. So I repeated the same steps and added some more oil to each cylinder after blowing them out and the plugs, too. Bam - it fired up again and I kept it throttled but after a while I let go of the throttle to see if it would idle, then died...Comment
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Oil is helping seal the rings... Don't waste your time... Its gotta be pulled apart.
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Yeah, that's what it looks like. I'm just scratching my head wondering how the car could be running one day and then go to this within minutes.... I probably had low compression across all cylinders after the rebuild - but I never checked as I didn't have a tester back then...Originally posted by FLG View Post
At least I know the head is good. I was hoping I could pull the pistons from the bottom with the oil pan removed but I'm not sure if that is even possible. I guess I'll just the pull the entire engine and try to keep the manifolds attached to the head. I hate removing and installing manifolds on the M20.Comment
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I read your other posts on e30tech and if you have a machine shop close by you trust. I would just pull that motor and take it back to the idiots with the warranty. Then when you pick it up take it by the other machine shop and pay them to check it out. Then if something is wrong with it at that point you may consider having them do it? or take it back to the dummies.
I've been working on cars for many years and I wouldn't attempt pulling pistons on an IX w/o pulling the motor out of the car. Its not that it can't be done its just a lot more work IMO to do it that way. You have to suspend the motor properly then the head has to come off along with oil pan and with an IX you have the drivetrain/sub frame up there to contend with. Its just easier to pull it out if you decide to go that route again IMO.Comment
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maybe the rocker was already broken and you didn't notice it. it was just a coincidence, and the engine actually died because the rings weren't done properly.Originally posted by EyExR View Post
it does sound like you got a lemon of an engine though. :(
didn't you say they were friends of yours?Comment
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vert this - Yeah, I actually came to this conclusion last night... I thought about pulling it and bringing the block to the idiots then bring it to the new shop by me to check out. But all the original shop did to the bottom end was a re-ring, polish the crank and bearings... The hassle and money associated with this job is the labor and gaskets to remove and install the engine. Also, I know the first shop will sit on this and take forever to get it back to me. I'm totally suspicious of their work and choice of parts. Screw it - I'm going to cut my losses.
Nando - I think you're right. The rocker was probably broken already... The piston sealing problem most likely occurred from a running rich issue combined with high revs leading to a complete ring failure across the board. I have to wonder if my cylinder walls are all scratched up...? I don't think so but I forgot to take a very close look when I had the head off. I'll have to refer to some pics I took.
The first shop is owned by an old friend of a friend who had worked on his car a long time ago. My buddy feels bad about putting me onto these guys... They may have hooked his Porsche up back in the 80s but they suck today. What was once a well respected speed shop is now a shit shop, unfortunately.Comment
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I think you'd have to be running pretty damn rich to destroy the rings like that. I think you would have noticed if it was dumping that much fuel.
6500rpm isn't really "high"..Comment
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I was probably closer to 7k....Originally posted by nando View Post
Probably the wrong rings? Oh well - I'll find out soon enough... I'll keep you guys posted on what the deal is....Comment
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I'd say wrong rings or they messed up something. M20s are stout... I bounce off 6800 rpm weekly.
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