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Showing results for tags 'knocking'.
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Hello, I recently purchased a 1990 Comanche 4.0 5spd The knock originates around the lower rear end of the engine block and bell housing, I can't tell for certain if its the engine block or bell housing. The knocking sound starts pretty much as soon at the engine starts, even on cold starts. Oil pressure when cold hovers a bit above 40 and as the engine warms up it lowers below 40 (around 30). The knocking seems to quite down a bit when warmed up but with that said it doesn't go away. The knock has a direct correlation to engine RPM, that seems to mellow at higher rpm. Please advise :) I have disconnected each injector one at a time while engine is running, this did not make the sound go away. Year: 1990 Engine: 4.0 Oil: 10w40 synthetic Engine Oil filter: Wix Transmission: AX-15 5 speed manual with internal slave cylinder -
So, stated driving the jeep a bit more. Started to hear knocking, like rod knock. Sucked, cause its a new stroker with less then ~500mi. Some research showed a common mis diagnosis of rod knock turns out to be cracked flex plate. So, I removed inspection plate on the transmission, and used a "snake camera" attached to my cell to look at the plate. And sure enough, there is a fresh crack. From center going to a hole. And some other spider cracks. This good news, as its not the engine. Bad news, though, cause the damn transmission was just installed 3 weeks ago. I always use failure as an opportunity to upgrade. I can't find any performance flex-plates for the Jeep AW4, like billet. Anyone ever see any performance ones? Image Not Found Image Not Found
