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Bearing Clearance

1948 - 1956 F1, F100 & Larger F-Series Trucks Discuss the Fat Fendered and Classic Ford Trucks

Bearing Clearance

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Old

Feb 5, 2018 | 11:18 PM

#1

KK560

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Mountain Pass

Joined: Feb 2017

Posts: 182

Likes: 13

From: Iowa

Bearing Clearance

How much rod and main bearing clearance is acceptable in a 226 or 254?

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Old

Feb 6, 2018 | 01:36 PM

#2

Mixer man

Logistics Pro

Joined: Sep 2014

Posts: 4,920

Likes: 21

From: Bothell & Silverdale, WA

Quote:

Originally Posted by KK560

How much rod and main bearing clearance is acceptable in a 226 or 254?

Book says:
Front, intermediate and rear mains - .0005" to .0032"
Rods - .0004" to .0027"
Seems a little snug to me though.
Same for H and M engines.

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Old

Feb 6, 2018 | 05:53 PM

#3

ALBUQ F-1

Fleet Owner

Joined: Jul 2004

Posts: 27,303

Likes: 1,062

From: NM

Quote:

Originally Posted by Mixer man

Book says:
Front, intermediate and rear mains - .0005" to .0032"
Rods - .0004" to .0027"
Seems a little snug to me though.
Same for H and M engines.

Note those are the "as manufactured" clearances. Somewhere there are "service limits" but I can't find them. I'd say if either are more than. 005" you'll have oil pressure concerns.

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Old

Feb 7, 2018 | 01:38 AM

#4

big job

Fleet Mechanic

Joined: Dec 2005

Posts: 1,603

Likes: 44

I like to see .0015 to even .002

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Old

Feb 7, 2018 | 12:15 PM

#5

Mixer man

Logistics Pro

Joined: Sep 2014

Posts: 4,920

Likes: 21

From: Bothell & Silverdale, WA

If your Plastigage comes in at .0025" to .004" you will qualify ok.

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