Bearing Clearances, Mains and Rods.

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Jan 20, 2010 | 12:53 PM

MS Fowler

Thread Starter

Junior Member

Joined: Dec 2009

Posts: 93

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From: Bel aAir, MD

Year: 1998

Model: Cherokee

Engine: 4.0

Bearing Clearances, Mains and Rods.

I've searched here, without sucess. The information is not even in the Chilton manual!

An online source gave the clearances as: Mains 0.0010 to 0.0025 inch
Rods 0.0015 to 0.0020 inch
That seems REALLY tight AND close.
Can someone confirm these ?

Engine is 2000 Cherokee 4.0

Jan 20, 2010 | 06:47 PM

milmat1

Seasoned Member

Joined: Aug 2008

Posts: 298

Likes: 1

Year: 2000

Model: Cherokee

Engine: 4.0L

Those numbers are correct according to my Haynes Manual,

Con Rod:
Desired 0.0015"-0,002" Allowable 0.001"-0.003"

Main Bearings:
Desired 0.002" Allowable 0.0025"

Jan 20, 2010 | 09:40 PM

MS Fowler

Thread Starter

Junior Member

Joined: Dec 2009

Posts: 93

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From: Bel aAir, MD

Year: 1998

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by milmat1

Those numbers are correct according to my Haynes Manual,

Con Rod:
Desired 0.0015"-0,002" Allowable 0.001"-0.003"

Main Bearings:
Desired 0.002" Allowable 0.0025"

Thanks for the verification.
I checked one Rod on the replacement engine and it came in right at anout .0018" The bearings look like they just came out of the box; not a mark on them. No embedded grit, all pure silver in color. Perfect.