D&C vette

Came home today hearing a slightly elevated tapping pass side. Here he vids _http://


Got valve cover and here is the latest

D&C vette

Push rod on loose rocker freely spins and can be moved laterally.

taken19

Could that be a lifter pre-load issue? Have you changed the cam or pushrod length recently?

D&C vette

car been same for almost 50k miles. Last had top end work done around 12K miles on car.

glenB

Bad lifter/cam

turboffr

Mine was tapping on drivers side and I could push the rocker off the valve by pushing on the pushrod end of the rocker. Lifter was bad and wasn't fully pumping up. Replaced all lifters and everything is perfect now!

D&C vette

bad lifter, has broken metal near roller. Also, lifter bore has light scoring in it.

taken19

Got any pics? I ask because my car is making a sort of clapping noise at idle when warm. Anything above idle and the noise goes away. Also not there when car is cold - anything when oil pressure above idle warm "normal" it seems to show up. I suspect lifter but don't know for sure.

D&C vette

taken19

Thanks. Think the flat spot was creating the noise or could it have been something else? I'm curious if the flat spot was created intermittantly or did it just lock up and begin grinding itself down.

That lobe of the cam is probably toast as well.

Is the roller still free to rotate it is it locked up?

D&C vette

Cam is toast, lobe has depression in it. Roller rolls but more in a oblong pattern instead if circle. Noise was very noticeable in head, but given the size of the missing metal pieces, gonna tear down entire motor and have it looked at. Thinking about a 402 or dropping a 408LY6 in. Depends on the boss and what she has planned other than 10 yr anniv.

taken19

Was your noise constant or only during a given set of conditions? Mine is only at idle with "hot" oil temp (>130 F)

glenB

Oil the roller pin, slap some JB Weld on the roller, shape, and it'll be fine ��

D&C vette

Noise was present at idle, just a tad but more noticeable while driving but always present.

2StrikeHtr

D&C,

I'm surprised that the sound on the video wasn't worse given the damage you had - I would have expected it to be much louder than that !! Good thing you investigated quickly.

Good luck with your rebuild !