Engine bearings

fran213 · Jul 21, 2021

Does anyone have the spec for the standard size main and rod bearings for a 134 engine ? Numbers on the back of the main bearing
read 1833cp FM RG . On the rod bearing they read DA861 66-12AD-49
Thanks

Kurt J · Jul 22, 2021

They size the bearings as std, 0.010", 0.020", 0.030", etc. This allows for machining the journal smaller if badly worn.
The I&T Service Manual has the following info on std size for non-diesel engine (paragraph 108 & 109):

Original build (std) Main Journal Diameter is between 2.4974-2.4988" with a clearance to the bearing of 0.0005-.0027". If I did the math right, to meet the above criteria, the std bearing diameter should be between 2.4993-2.5001"

Connecting Rod Journal Diameter is between 2.2978-2.2988" with a clearance to the bearing of 0.0007-0.0027". If I did the math right again, to meet the above criteria, the std bearing diameter should be between 2.2995-2.3005"

jimtrs · Jul 23, 2021

(quoted from post at 12:50:59 07/21/21) Does anyone have the spec for the standard size main and rod bearings for a 134 engine ? Numbers on the back of the main bearing
read 1833cp FM RG . On the rod bearing they read DA861 66-12AD-49
Thanks

Would typically also state "STD", ".010", ".020", ".030" below the numbers etc.

Engine bearings

fran213

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Kurt J

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jimtrs

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