502EFI Internal noise diagnosis...Listen
#33
Just thinking, since you had the motor out, assume you had the exhaust off, which rules out exaust gasket leak.
Whatever noise it is has to be related to number 6 firing since it goes away when you pull the plug wire off.
I still say...wrist pin.
Whatever noise it is has to be related to number 6 firing since it goes away when you pull the plug wire off.
I still say...wrist pin.
#37
Platinum Member
Platinum Member
iTrader: (6)
good one Ben
#39
I say the bent pushrod was on an exhaust valve and it is now bent again.
If it was a rotating part it would be rythmic - it isn't.
Had that happen before. Time to do a valve job and bronze wall the guides.
If it was a rotating part it would be rythmic - it isn't.
Had that happen before. Time to do a valve job and bronze wall the guides.
#40
Charter Member # 55
Charter Member
I agree that it does sound similar to the sound that counter weighted internal exhaust flappers make. Exhaust flapper noise also goes away around 1200rpms.
That does not explain the prior bent push rod or why the noise stops when the #6 wire is removed.
That does not explain the prior bent push rod or why the noise stops when the #6 wire is removed.