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Unread 01-18-2011, 04:53 PM   #1
Registered User
1997 ZJ 
Join Date: Feb 2009
Location: , Missouri
Posts: 132
4.0 crankshaft specs

I am in the process of putting new bearings in my 96 grand cherokee and am shopping for a micrometer to measure the journals with. I searched and one site said the rod journals were just over 2 inches, is this correct? And does this mean I need a 2-3 inch micrometer? or would a 1-2 inch be better since it could be worn and under 2 inches?

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Unread 01-19-2011, 07:04 AM   #2
Farm Wheeler
2000 TJ Wrangler 
Join Date: Apr 2005
Location: Elkmont, AL
Posts: 10,050
Main journals = 2.4996 to 2.5001 in.

Rod journals = 2.0934 to 2.0955 in.

If your rod journals have worn to below 2 inches you don't need to worry about measuring it. The journal will have lost over 3/32" and the crankshaft will have destroyed itself and taken the block along with it.
Keep in mind that free advice can frequently be worth less than you pay for it.
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