Need rod bearing number???

T

Thriftmaster

Member
Can anyone on here tell me what the bearing number is for a 1939-1948 Mercury 100 horse Flathead with full floating rod bearing in Johnson Bronze with a STD on the crank throw and a STD on the rod journal?
Thanks in advance.
 
Thank you for your reply. What I'm actually trying to find out is the bearing number for a set of Johnson Bronze bearings which is two letters followed by two numbers. For example FB-26 or FB-46. A Freind has a bunch of Johnson Bronze bearings but no info on what they fit other than they are for flatheads or so his father had told him.
I'm trying to see if any will fit an engine I am collecting parts for.
 
Seems to me that if you were able to determine that the journals are STD, you should be able to measure the bearings to determine if they are the correct size to give the required clearance.
 
I have some Johnson bearings for the 1.999 crankpin marked FB26x2 which are .oo2 under, so I think the standard bearing would be FB26. Standard bearing thickness would be .109.
 
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I'd run these bearings with alittle more clearance on the rod side and sid play on the crank to improve oil flow through the bearing to help cool it. I have a new set for a .030 crank.
 
I have a set of the FB 26 for the early small crank pin diameter (STD)


I have a set of the FB-27 for the late large crank pin diameter (STD)


Numbers after the Base Number would indicate undersize, no numbers would be (STD)
 
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