Non-BMW Stuff on a BMW Forum
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Redid the crank bearings last night and I’m glad I did. I didn’t clean it as thoroughly as I could have before. Cleaned all the piston rings grooves and started measuring ring gaps.
The Bentley Manual calls for a .012 - .020 gap and all the rings came in at .013 on the first two cylinders. Looks like I might be able to get away without having to do any filing.
Did you check clearance with plastigage?
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Nope. In my mind, if it was fine with the old bearings in there before, it’s going to at a minimum be better with new ones.
Not that I haven't done the same, but from a manufacturing standpoint this is terrible logic.
I'm glad you get to avoid filing rings, that's a tedious task that usually requires a spare ring or two!
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Not that I haven't done the same, but from a manufacturing standpoint this is terrible logic.
I'm glad you get to avoid filing rings, that's a tedious task that usually requires a spare ring or two!
I knoooowwwwww. I guess I can check the clearances. I’ve taken back apart once. I know you’re supposed to do it it dry but I’ve already lubed it up. Will I be fine taking the crank out and wiping down the bearings to remove most of the oil?
Also, can anyone confirm that the bearing clearance should be between .03-.07 mm?
edit: bought some plastigauge. I’ll pull the crank off and wipe down the bearings and measure the clearance section.
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All clearances are on the bottom end
allow myself to introduce...myself
Dan
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Pulled the crank back out tonight, cleaned off the bearings, put it back in with plastigauge.
.038 across the all 7 caps. Very healthy. At least I know now. Also got three pistons ready to go in.
I had a panic attack for you and then realized you must mean .038 mm, which is about .0015 inch which I would say is perfect if I remember right. I think spec is .0008 to .0018 but it has been a while. How I can remember correct bearing clearances but forget half of the stuff I need when I go to the store I don't understand.
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I had a panic attack for you and then realized you must mean .038 mm, which is about .0015 inch which I would say is perfect if I remember right. I think spec is .0008 to .0018 but it has been a while. How I can remember correct bearing clearances but forget half of the stuff I need when I go to the store I don't understand.
Lol. Yeah. .038mm.
I remember very random car details and then I’m like what’s my kids’ names again?
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Playhouse build thread time
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Playhouse build thread time
Lol. Nothing super exciting. But, she’ll be thrilled when it’s done. We’re telling her it’s a tool shed for the lawnmower and she can’t play in it. It’s For her birthday next month.
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Thats fine, and on older engines it is preferable for the lip seals to ride deeper or shallower than normal to avoid riding in the minute groove that is formed on the shaft surface
That outer lip doesn’t even touch the crank. The inner seal do for sure, just not the outer one. That’s okay?
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The actual sealing lip is further back like so.
Trust your gut, if you feel funny about it, redo it with a new seal and also check to make sure the aluminum seal housing is sitting flush on the block. Kind of a dumb suggestion but its the only thing im coming up with off the top of my head that could physically affect the seal position
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That picture helps. It’s weird to me that this one would have that gap around the outer lip but the others wouldn’t. That’s why it’s throwing me off.
theres like 100 types of shaft seals, this should not be weird to you.
Dan
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theres like 100 types of shaft seals, this should not be weird to you.
This is the first time I’ve seen one that was “open” on the face like that. It’s the only seal on the m20 like that and I’ve never seen one on all of the Volvo’s I’ve owned.
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