Valve cover exploded!
#1
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Year: 1984
Model: Cherokee
Engine: 2.5l 4 banger
Valve cover exploded!
I'm not sure where to put this but i thought this was the best. Went out to start my 2.5l straight 4 1984 jeep Cherokee. I went to start it and boom! white smoke was everywhere couldn't see 2 feet in front of me. got out and the valve cover was in pieces. What could cause this? no oil? gas with the oil? Its a mechanical fuel pump.
#3
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Year: 1985
Model: Cherokee
Engine: 2.5L
I know on my 85 it builds quite a bit of pressure in there because of ring blow by. If the vent tube at the rear became clogged and the PCV did also, it might be possible to build that much pressure if it doesn't release at the dipstick.
Looks like you did the Webber upgrade on the carb, where does that rear vent tube connect to?
Looks like you did the Webber upgrade on the carb, where does that rear vent tube connect to?
#6
I know on my 85 it builds quite a bit of pressure in there because of ring blow by. If the vent tube at the rear became clogged and the PCV did also, it might be possible to build that much pressure if it doesn't release at the dipstick.
Looks like you did the Webber upgrade on the carb, where does that rear vent tube connect to?
Looks like you did the Webber upgrade on the carb, where does that rear vent tube connect to?
Both are true.
Likely your mechanical fuel pump leaks.......leaked fuel into the crankcase.
Swap your pump.
Change your oil.
Get a new aluminum VC.
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#8
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Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Yep. I might pull the pump and verify that the diaphragm isn't letting raw fuel unto the crank case. Once you get her squared away, (Oil change?), be sure you have the valve cover venting properly.
I'm a little curious about the actual point of ignition. A spark past both compression rings, and the oil ring as well? Something past an exhaust valve guide. Or maybe a backfire in the intake flashing through the vent tube....I like that last one
I'm a little curious about the actual point of ignition. A spark past both compression rings, and the oil ring as well? Something past an exhaust valve guide. Or maybe a backfire in the intake flashing through the vent tube....I like that last one
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Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Credit where credit is due JD. It's non oped, and used for "farm work". It's been over 15 years since I changed the head, but today I checked, and indeed, it IS a plastic VC.
(wonder what would have blown if the OP"s wasn't!)
(Oh, and I wouldn't trust that filter to not clog up inside and give CC pressure) How meany RM's have been changed over those?
(wonder what would have blown if the OP"s wasn't!)
(Oh, and I wouldn't trust that filter to not clog up inside and give CC pressure) How meany RM's have been changed over those?
Last edited by DFlintstone; 04-24-2016 at 11:45 PM.
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