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Unread 11-29-2011, 08:57 AM   #1
leblanj
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1988 YJ Wrangler 
 
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Coolant Problem

Just rebuilt everything for my 88 wrangler 4.2 258. It ran great for about 550 miles after rebuild, then the water pump started to leak. I changed the water pump and now the coolant is filling into the overflow tank and spraying all over the engine compartment after driving a mile or so down the road. All the hoses are connected correctly. I just changed the head gasket and test drove it again and I will get a mile down the road and the same problem will occur. It will not happen when it is idling in the driveway. This is our only problem with the jeep and we are out of ideas on what to try next.

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Unread 11-29-2011, 09:07 AM   #2
jbolty
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1990 YJ Wrangler 
 
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Is it v belt, or serp? If serp, you may have gotten the wrong rotation water pump.

The cap should hold pressure up to about 15 psi before releasing water to the overflow.
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Unread 11-29-2011, 09:17 AM   #3
Old4X
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Cracked head or block. Did you bore the cylinders oversize?
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Unread 11-29-2011, 09:32 AM   #4
leblanj
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It is a v belt. Radiator is new along with the cap.
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Unread 11-29-2011, 09:35 AM   #5
leblanj
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Had to bore the cylinders .30, we lost compression earlier this year and thats why we rebuilt the motor.
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Unread 11-29-2011, 09:53 AM   #6
Cooter92YJ
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It's got to have something to do with the new water pump, whether like J-Bolty said wrong rotation or just plain the wrong one. Didn't do it before the new one, right?
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Unread 11-29-2011, 10:01 AM   #7
leblanj
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Same water pump by part number and this issue has never occurred before.
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Unread 11-29-2011, 10:02 AM   #8
moonshinefuel
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Maybe the thermostat is not opening.
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Unread 11-29-2011, 11:26 AM   #9
hotelconucc93
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To see it happen, you might have to idle it in the drive......but...make it happen. Work the throttle and rev it to 2000 and hold it while you watch.
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