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Labor Day Putting down your wrenches or time for
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| | | | Joined: Nov 2002 Posts: 394 'Bolter | | 'Bolter Joined: Nov 2002 Posts: 394 | Looking at a set of brand new insert rod bearings that are for a 235' 6 cylinder on the box with no numbers stamped or written anywhere. What thickness would the insert be if it was standered? I know its cold outside, so don't make a special trip to go out to your shop and find one to mike....... Thank you | | | | | Joined: Feb 2004 Posts: 29,742 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,742 | According to the Federal-Mogul Shop Specifications Manual:
Standard shaft size: 2.312"
Connecting rod bore size: 2.437"
A little math tells me that a standard bearing will have a shell thickness of .0625"
.010" undersize: 0.0675"
.020" undersize: 0.0725"
.030" undersize: 0.0775"
These dimensions will vary slightly according to how much oil clearance is built into the bearing shells. If they don't have an undersize marked, they're probably standard size. To get an accurate measurement of the actual thickness you'll need a ball-anvil micrometer, AKA "tubing micrometer". You can get a pretty accurate SWAG with the tapered tip jaws of of a dial caliper.
Edit: These dimensions are for the 54-62 full pressure engine. Babbit-rod conversion bearings will have a different outside diameter and width.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Apr 2005 Posts: 2,832 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,832 | Jerry nailed it but I would bolt one up to a dry crankshaft (no oil) and torque it down with a strip of .001 to 003 plastigauge. If the flattened gauge measures .001 to .0025 the bearing is right for the crank pin.
Evan
| | | | | Joined: Feb 2004 Posts: 29,742 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,742 | That assumes he's got a crankshaft and a rod handy. It seems he's trying to identify a set of unmarked bearings by themselves.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Nov 2002 Posts: 394 'Bolter | | 'Bolter Joined: Nov 2002 Posts: 394 | Yeah well like Hotrod said if I had an extra crank I would perform a little inside /outside measuring.. I'll just hang onto them? Thank you......
Last edited by ol' 55; 01/11/2019 9:41 PM.
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