Block/Coolant Jacket flush
Thread Starter
Junior Member
Joined: Mar 2015
Posts: 36
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From: Northern California
Year: 1991
Model: Cherokee
Engine: 4.0 inline 6
Hey guys. My water pump took a crap on me today and started disintegrating into my cooling system. I know i can flush the radiator through the lower hose but i need to flush the block as there is metal shavings in it.
So can i just run the hose through it or do i need to remove the thermostat? Is there a drain plug on the block?
Any help would be great.
So can i just run the hose through it or do i need to remove the thermostat? Is there a drain plug on the block?
Any help would be great.
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
You can flood water into the water pump opening and remove a block plug or 2 on the driver's side of the block. Requires a 5/16" square drive.
Thread Starter
Junior Member
Joined: Mar 2015
Posts: 36
Likes: 0
From: Northern California
Year: 1991
Model: Cherokee
Engine: 4.0 inline 6
Thanks cruiser. Got it all done and burped. I noticed the new pump is making a slight growling noise. It seemed to dissapate as i burped the system. Any insight into that?
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Thread Starter
Junior Member
Joined: Mar 2015
Posts: 36
Likes: 0
From: Northern California
Year: 1991
Model: Cherokee
Engine: 4.0 inline 6
Yes sir. I'll triple check but i believe so. I saw no wobbles or play in the belt or pulleys. We'll see how it sounds this morning now that the system is purged and the engine is cold again.
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