main bearing problem!! never seen this before

supraguy@aol

Well-Known Member
Dec 30, 2005
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If you mean that- once the bearing is installed, you have a slight bit of exposed main saddle on either side, I think that's normal.
Here's my bearings(Clevites), and if you look closely, you'll see that there's about 1mm on either side.

p1898715_1.jpg
 

Needboost

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Mar 2, 2009
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supraguy@aol;1898715 said:
If you mean that- once the bearing is installed, you have a slight bit of exposed main saddle on either side, I think that's normal.
Here's my bearings(Clevites), and if you look closely, you'll see that there's about 1mm on either side.

p1898894_1.jpg

thats the ame way that mine looks like. is that the same block with the no.3 main oil hole and bearing does not line up
 

Needboost

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Nick M;1898697 said:
I would get a bearing that fits.

thats what i would like to but what if their isnt one. i wasnt able to call clivete today but from the research that i have done other people dealing with chevys and ford they say that they do not have a bearing for these odd blocks when they call clivete they said will have to either match the block to the bearing or match the bearing to the block
 

Nick M

Black Rifles Matter
Sep 9, 2005
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Needboost;1898895 said:
other people dealing with chevys and ford

Not to slight your post, but that doesn't really mean anything.

match the bearing to the block

Toyota did it when it was new. You should do the same. And all cars you have to match the bearing to the engine, or the engine to the bearing. The exception to that is something like a Crown Victoria and a 4.6 Romeo block where Ford used the same block in a number of cars and trucks. But you still have to match them up.
 

adampecush

Regular Supramaniac
May 11, 2006
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Is a slight decrease in flow to the oil pump shaft really going to have a major negative effect on the longevity of the engine, especially with modern oils? My guess is no, and I'm not sure if you want to improve flow too much more, since it could theoretically reduce flow to the rod bearing under certain conditions. Do you remember what the bearings that came out of the engine looked like? Maybe there was a reason that the oil pump shaft hole was drilled slightly offset on certain block castings.
 

IndigoMKII

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May 9, 2011
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adampecush;1899067 said:
Is a slight decrease in flow to the oil pump shaft really going to have a major negative effect on the longevity of the engine, especially with modern oils? My guess is no, and I'm not sure if you want to improve flow too much more, since it could theoretically reduce flow to the rod bearing under certain conditions. Do you remember what the bearings that came out of the engine looked like? Maybe there was a reason that the oil pump shaft hole was drilled slightly offset on certain block castings.

So you'd like to keep the oil flow restricted on an already oil starved engine, interesting concept.
 

Dan_Gyoba

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Aug 9, 2007
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No... He's suggesting that maybe the oil pump driveshaft bearings could stand to have less oil in order to have potentially better flow to rod bearings, as well as potentially higher pressure/flow available to the head, turbo and other systems which more typically have oil starvation problems.

I for one have never heard of someone taking apart a 7M and having the oil pump driveshaft bearings show oil starvation damage without other more severe problems elsewhere.

The block that I'm building had major damage to the mains and rod bearings, but the oil pump driveshaft bearings were all still in spec and looked perfect, even though it had obviously been run with inadequate oil pressure/flow for an extended period of time, causing destruction of several sets of rod bearings.

Though this may not apply to all blocks, I believe that it would be safe to say that had the oil holes to the driveshaft bearings been slightly smaller, or the bearing holes not completely aligned, they'd have been okay.

Still, given enough unknowns, like the possibility of oil forcing itself between the block and the bearings causing less clearance between the crank and bearing and increasing the possibility of spinning a bearing, I'd still do the work to match it, in the end.
 

adampecush

Regular Supramaniac
May 11, 2006
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IndigoMKII;1899086 said:
So you'd like to keep the oil flow restricted on an already oil starved engine, interesting concept.

what dan said. you misread my post - improving the flow to the oil pump drive shaft will reduce flow through the main bearing up to the rod on the affected cylinder.
 

matts1987

New Member
Dec 3, 2012
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My build had the same thing in it when I tore the motor down the last time there was nothing irregular and if I'm not mistaking those main bearings look like clevites
 

Needboost

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Mar 2, 2009
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matts1987;1899559 said:
My build had the same thing in it when I tore the motor down the last time there was nothing irregular and if I'm not mistaking those main bearings look like clevites

yea they are clevittes. im gonna just file the block down a little bit to take off the edge a lil and smooth it out a little to help oil flow a lil easier. so yours didnt line of perfectly on no. 3