rod bearings
Elder User
Joined: May 2008
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From: Wasilla, AK
It is a .010 (thousenth) over bearing. Your crank has been turned .010 on the rod journals if these are the ones you pulled out? Don't know what the other letters/numbers mean, probly factory coding.
Elder User
Joined: May 2008
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From: Wasilla, AK
The bearing is 10 over. The crank has had 10 thousenth taken off to clean up the rod journals, so the crank in 10 under. Most likely a 10/10 crank, 10 on the rods and 10 on the mains. But the only way to make sure it's a 10/10 is to pull a main bearing cap and look at it for similar numbers. BE SURE TO TORQUE EVERTHING BACK TO SPECS!!
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Senior User
Joined: Feb 2004
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well i just repalced rod bearing today aint gonna take the motor out.. im gonna run this one till it blows. it looks like someone rebuilt it but did a really bad job of keeping it clean so i cleaned out the bottom end as good as i can replaced oil pump and thats about it.. its just a play truck so it wont really be to bad when it blows.
Elder User
Joined: May 2008
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From: Wasilla, AK
Run it a few days and change the oil and filter. I know it is somewhat expensive for oil these days but you can't get all the garbage out oil passages by wipping the inside of the engine down. The new pump will push them thru to the filter. Run that cheapo Wal-Mart Tech oil and a Frame filter. Change them out a couple of times in the next few weeks. Then change to a good quality oil and a Napa Gold or Motorcraft (Wal-Mart sells Motorcraft also) oil filter.
Cargo Master
Joined: May 2007
Posts: 2,071
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From: British Columbia
U.S. Bearings
Tlk50 has an interesting point that the bearings are really oversize (on their inside dimension), but bearings are always described by the journal they fit. So a bearing that fits an undersize ground journal is an undersize bearing. That's what the u.s. means-under size.
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Elder User
Joined: May 2008
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From: Wasilla, AK
Now that I thought about it BeanScoot your probably right. But if it is a metric crank would still it be 0.010 of an inch under? I don't know, just a thought that popped into my head? I think the Fm is probably for Federal Mogul bearings.
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Cargo Master
Joined: May 2007
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From: British Columbia
I think you are right on the FM or fm = Federal Mogul bearings. For metric engines, the undersizes would be .25 and .50 and .75 and possibly 1.00mm. Since one mm is 0.039", these correspond very closely to .010, .020, .030 and .040".
So if you saw .25 or .75 on a set of piston rings or bearings, you'd know it was metric since the parts couldn't be a quarter inch oversize.
So if you saw .25 or .75 on a set of piston rings or bearings, you'd know it was metric since the parts couldn't be a quarter inch oversize.
Elder User
Joined: May 2008
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From: Wasilla, AK
No I Wouldn't!
I hope NumberDummy isn't reading this post OOPS!
Tim
