Engine overheating after replacing head gasket
Thread Starter
Junior Member
Joined: Jun 2023
Posts: 33
Likes: 5
From: Ohio
Year: 1996
Model: Cherokee (XJ)
Engine: 4.0 6 Cylinder
Alright so if you're following my old posts you know what's going on. Put a new head gasket on. Mistakenly put some oil over the pistons before putting the head on. Started it last night and it ran rough for 5 seconds and Started smoking until it started running a little better. Shut it down worried it might catch fire. Started it again this morning and it burned some more off before running pretty well. I let it idle for 10 minutes and checked the temperature gauge and nothings moving. Shut it down because it was starting to overheat. Upper radiator hose is swollen and almost trying to escape out the hose clamp. Slight gurgling in the coolant reservoir but it's almost out and no heat coming from it so I don't think it's burning coolant. But could it be? Could the oil in the pistons have burned so rich that it blew my new head gasket? Any ideas?
I am no expert, but sounds like you have no flow of coolant through the radiator, like it is clogged. Did you put a new radiator in? And maybe left the shipping plugs in the openings?
As far as the temp gauge goes, did you remember to hook the wire to the sensor after you put the head on?
These are all mistakes I have made in the past.!
As far as the temp gauge goes, did you remember to hook the wire to the sensor after you put the head on?
These are all mistakes I have made in the past.!
Last edited by oldnslow; Jul 13, 2023 at 12:10 PM.
Thread Starter
Junior Member
Joined: Jun 2023
Posts: 33
Likes: 5
From: Ohio
Year: 1996
Model: Cherokee (XJ)
Engine: 4.0 6 Cylinder
Ive been reading that on the 96 and below this is the second temperature sending unit? But where does it go? Theres no receiving unit. Also I should mentioned I sent the head into a machine shop to get resurfaced and hot dipped.
Last edited by Xjrebuild23; Jul 13, 2023 at 12:17 PM.
Thread Starter
Junior Member
Joined: Jun 2023
Posts: 33
Likes: 5
From: Ohio
Year: 1996
Model: Cherokee (XJ)
Engine: 4.0 6 Cylinder
I am no expert, but sounds like you have no flow of coolant through the radiator, like it is clogged. Did you put a new radiator in? And maybe left the shipping plugs in the openings?
As far as the temp gauge goes, did you remember to hook the wire to the sensor after you put the head on?
These are all mistakes I have made in the past.!
As far as the temp gauge goes, did you remember to hook the wire to the sensor after you put the head on?
These are all mistakes I have made in the past.!
Thread Starter
Junior Member
Joined: Jun 2023
Posts: 33
Likes: 5
From: Ohio
Year: 1996
Model: Cherokee (XJ)
Engine: 4.0 6 Cylinder
Also my serpentine belts is screeching really bad the first 5 seconds after starting up. Then it goes away. Any help would be great.
CF Veteran
Joined: Jun 2017
Posts: 2,215
Likes: 635
From: Hangover, PA
Year: 1998
Model: Cherokee(XJ)
Engine: 4.0L
It should not be overheating in 10 minutes of idling. How do you know it was overheating if the gauge doesn't work?
did you confirm with a thermometer?
did you burp the air out of the coolant system?
Is the coolant system full?
did you confirm with a thermometer?
did you burp the air out of the coolant system?
Is the coolant system full?
Thread Starter
Junior Member
Joined: Jun 2023
Posts: 33
Likes: 5
From: Ohio
Year: 1996
Model: Cherokee (XJ)
Engine: 4.0 6 Cylinder
I think you're right. It was the air in the coolant system. She's burbed now and I'm about to run it and see what happens. The serpentine belt screeching at startup is driving me insane though. Any ideas on that before I put the electric fan back in?
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Thread Starter
Junior Member
Joined: Jun 2023
Posts: 33
Likes: 5
From: Ohio
Year: 1996
Model: Cherokee (XJ)
Engine: 4.0 6 Cylinder
Yep air locked coolant system. She runs fine now. Screeching was the serpentine belt too loose. I'm a little worried I damaged the long tension bolt threads trying to loosen and tighten without loosening the tension pulley first. Now when I tighten the belt up she runs fine and doesn't screech but if I stop and turn off the engine and restart it there's the screech again just not as bad
Member
Joined: May 2021
Posts: 136
Likes: 50
From: San Antonio, Texas
Year: 1999
Model: Cherokee (XJ)
Engine: 4.0L
Yep air locked coolant system. She runs fine now. Screeching was the serpentine belt too loose. I'm a little worried I damaged the long tension bolt threads trying to loosen and tighten without loosening the tension pulley first. Now when I tighten the belt up she runs fine and doesn't screech but if I stop and turn off the engine and restart it there's the screech again just not as bad
That belt needs to be very tight. You should only be able to deflect the belt about a 1/4 between the water pump and air conditioning pulleys.
Todd
how are the pulley bearings and belt surface
should not screech
sure it should be tight, but it should not screech unless something is amiss
there are several sizes that fit a '96, check the size which is printed on it
if you spray pure water with a $2 pressure bottle at each the bearing, and it goes quiet, that identifies the fault, aim careful, the fan blows water, which will also quiet yr belt
should not screech
sure it should be tight, but it should not screech unless something is amiss
there are several sizes that fit a '96, check the size which is printed on it
if you spray pure water with a $2 pressure bottle at each the bearing, and it goes quiet, that identifies the fault, aim careful, the fan blows water, which will also quiet yr belt
Last edited by awg; Jul 15, 2023 at 07:26 PM.
Junior Member
Joined: Apr 2023
Posts: 65
Likes: 10
From: Ozarks national forest, Arkansas
Year: 1994
Model: Cherokee (XJ)
Engine: 4.0
Yep air locked coolant system. She runs fine now. Screeching was the serpentine belt too loose. I'm a little worried I damaged the long tension bolt threads trying to loosen and tighten without loosening the tension pulley first. Now when I tighten the belt up she runs fine and doesn't screech but if I stop and turn off the engine and restart it there's the screech again just not as bad
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