4.0 crankshaft specs - JeepForum.com

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post #1 of 2 Old 01-18-2011, 03:53 PM Thread Starter
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1997 ZJ 
Join Date: Feb 2009
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?

benspilk09 is offline  
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post #2 of 2 Old 01-19-2011, 06:04 AM
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2000 TJ Wrangler 
Join Date: Apr 2005
Location: Elkmont
Posts: 10,048
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.
mdm is offline  

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