Who has ever had to replace main bearings due to cracked 0331 head?
01-25-2012, 01:31 PM
#1
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Year: 00'
Model: Cherokee
Engine: l6 4.0l 242.c.i.
Who has ever had to replace main bearings due to cracked 0331 head?
Is there any way to tell if they are bad other than low PSI?
01-25-2012, 02:38 PM
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Year: 1990
Model: Cherokee
Engine: 4.0
Originally Posted by kjc
Worn main bearings won't cause lower compression. Worn, sticking valves and/or piston rings will. The only way to know if your mains are worn/damaged is a visual inspection/measuring.
01-25-2012, 02:42 PM
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Year: 2015, 2012
Model: Grand Cherokee (WK2)
Engine: 3.6L
If you had a cracked head, and are experiencing low oil pressure, I would assume the coolant in the oil wiped the mains.
You need 13 PSI at hot idle, and 10 PSI for every 1000 RPM beyond that.
You need 13 PSI at hot idle, and 10 PSI for every 1000 RPM beyond that.
01-26-2012, 06:41 PM
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Year: 00'
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Engine: l6 4.0l 242.c.i.
Alrighty well I havent fired it up yet. Im double checking everything tomorrow morning and putting oil in and hoping she fires up first start.
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