intermittant knock.
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New User
Joined: Jan 2003
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From: Victoria
intermittant knock.
Sounds like it's in the valve train and it comes and goes,usually worse at higher rpm's.
At idle even, when I can hear it clearly under acceleration ,it goes away.
It seems to knock at very odd times,like sometimes cold in the morning and sometimes after having driven around for a while.
Oil level is good but I'm not too sure about the oil pressure as the gauger is untrustworthy.
It's an 88 351.
Any help would be appreciated
I tried to search.
At idle even, when I can hear it clearly under acceleration ,it goes away.
It seems to knock at very odd times,like sometimes cold in the morning and sometimes after having driven around for a while.
Oil level is good but I'm not too sure about the oil pressure as the gauger is untrustworthy.
It's an 88 351.
Any help would be appreciated
I tried to search.
Elder User
Joined: Apr 2002
Posts: 813
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From: NJ
years ago i had a bad wrist pin bushing and it sounds just as you describe. it sounded like valve train and rerally had me fooled. seems that when the cylender fired id get a loud knock. it would come and go as you describe.
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New User
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From: Victoria
I've considered wrist pin but keep coming back to it not knocking all the time.
I guess at the very least next time it's knocking loudly I'll pull over and try to isolate which cylinder it may be.
I guess at the very least next time it's knocking loudly I'll pull over and try to isolate which cylinder it may be.
Senior User
Joined: Dec 2003
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From: Los Angeles
Sounds like my problem...after 10 to 20 mins of driving, at Idle with DRIVE and/or PARK, I get that knocking. But not along with RPM. I've located the knock somewhere in the bottom end through oil pan.
Also the oil pressure gauge wigs out , after awhile of idle... the pressure will goto and stay at (L) but idle is still there.
I've read some threads about the oil pressure wigging out. But not my knocking noise.
Also the oil pressure gauge wigs out , after awhile of idle... the pressure will goto and stay at (L) but idle is still there.
I've read some threads about the oil pressure wigging out. But not my knocking noise.
Elder User
Joined: Apr 2002
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From: NJ
i thought the same as you on the wrist pin. but as the bushing spins in the pin guide this would cause the knock to come and go. i drove mine to lake george towing a boat and had no problem but i was just lucky and would not suggest driving that far. but again it really had me fooled .
Elder User
Joined: Apr 2002
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From: NJ
they are bronze type bushing that lines the two holes in the piston where the wrist pin goes through.
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Senior User
Joined: Nov 2003
Posts: 348
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From: Indiana
IIRC, the 302 and 351 use pressed in piston pins. That means the pin is pressed into the rod, and the piston rotates around the pin. There are no brass bushings involved on pressed in pins.
On a full floating pin (aftermarket rods) the rod has a brass bushing it it, the pin is held in place by clips on each end, and the pin is free to rotate.
Steve
On a full floating pin (aftermarket rods) the rod has a brass bushing it it, the pin is held in place by clips on each end, and the pin is free to rotate.
Steve
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