Engine bearing shims
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Hotshot
Joined: Oct 2009
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From: Burbank, WA
Engine bearing shims
So I'm waiting out the cold today and watching the snow flutter, sitting around window shopping on ebay, and I run into this display of engine bearing shims. Is there someone here old enough or experienced enough in building ancient engines to teach me how this works? This must be some kind of "fix" that avoids machining and purchase of under/oversize bearing inserts, or with babbit type? There are shims for main bearings and rod bearings in the packages. Curious.
https://www.ebay.com/itm/12642408831...mis&media=COPY
https://www.ebay.com/itm/12642408831...mis&media=COPY
Believe Nothing
Joined: Jun 2004
Posts: 7,514
Likes: 398
From: W. Central FL.
The Stovebolt Chevys came with shims in the rods between the rod and caps. Whenever the engine got 40-50k miles, you would drop the pan and remove a shim or two. These engines had poured rods and caps so this was the only way to adjust the bearing clearance. When the engine was rebuilt with new poured bearings, the shims would be used again. The Chevy is the only one I am familiar with but other manufacturers used the same concept.
Edit: A little story: Sometime in the mid1950s, I bought a 1941 Chevy that had been on blocks during WW11. It had somewhere in the 40K miles shown so I decided to drop the pan and adjust the bearings. I was so pleased to only be able to remove one shim per rod side.
Edit: A little story: Sometime in the mid1950s, I bought a 1941 Chevy that had been on blocks during WW11. It had somewhere in the 40K miles shown so I decided to drop the pan and adjust the bearings. I was so pleased to only be able to remove one shim per rod side.
Lead Driver
Joined: Jul 2003
Posts: 9,366
Likes: 1,726
From: AKRON ohio
I bought a 1962 ford truck with a 292 back in 1988 and it was supposed to be rebuilt. Well 900 miles later it had a main bearing knock. Dropped the mains and there was aluminum foil between the main caps and the bearings. All the mains were heavily scored but The # 5 main journal was scored .029"
yep I got took
yep I got took
Fleet Owner
Joined: Jul 2004
Posts: 27,294
Likes: 1,055
From: NM
Ray, I think the pictured set is a different kind of shim, that goes behind the bearing insert. See here: https://deckwartaperedshims.com/main...oduct-info.php
Hardly an ideal solution but if times are tight, you do what you need to.
Hardly an ideal solution but if times are tight, you do what you need to.
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Hotshot
Joined: Oct 2009
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From: Burbank, WA
He wants 3 and a half plus shipping. I included the link to the ad in the first post, above.
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Laughing Gas
Joined: May 2015
Posts: 1,019
Likes: 83
From: Central Oregon
Pretty cool find. I use them on my hit and miss engines. I've saved quite a few shims over the years.
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Believe Nothing
Joined: Jun 2004
Posts: 7,514
Likes: 398
From: W. Central FL.
Ray, I think the pictured set is a different kind of shim, that goes behind the bearing insert. See here: https://deckwartaperedshims.com/main...oduct-info.php
Hardly an ideal solution but if times are tight, you do what you need to.
Hardly an ideal solution but if times are tight, you do what you need to.
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