Can a cracked 0331 pass block tester?

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Mar 8, 2013 | 04:21 PM

gthbryce

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Joined: Mar 2011

Posts: 194

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From: Carmichael, CA

Year: 2001

Model: Cherokee

Engine: 4.0

Can a cracked 0331 pass block tester?

I bought block tester from auto zone and put it on my radiator did the mumbo jumbo and for over 5 minutes with engine running and hot...would a cracked head pass this test?

Mar 8, 2013 | 05:12 PM

cruiser54

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Joined: Aug 2011

Posts: 43,971

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From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Yep. Because the coolant is going into the crankcase, not the combustion chamber.

Mar 8, 2013 | 06:02 PM

tjwalker

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Joined: Nov 2010

Posts: 5,840

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From: In the middle of Minnesota!

Year: 1999

Model: Cherokee

Engine: 4.0

I've seen the block test both pass and fail with a cracked 0331 head.

I'd recommend a cylinder leakdown test as a primary test for a suspected cracked head.

Mar 8, 2013 | 07:32 PM

HudsonN

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Joined: Jul 2012

Posts: 484

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From: New Milford, CT

Year: 1999

Model: Cherokee

Engine: 4.0

I just had my 0630 head checked for cracks and mine was cracked.

I did the combustion gas test as well with the radiator and what not and it passed.

I think that test just checks for a blown headgasket.