4k Head Problem

[superbmobile]

I had 30 thou shaved off my 4k head to raise compression. So i put it all back together today but now there is a really loud tapping that sounds like its coming from the top end its, not valve clearance or the rocker gear because i adjusted the clearances until they almost had no gap at all but it wouldn't go away so i put another rocker gear in and still the same I'm thinking maybe because of the head sitting lower the push rods are on a different angle that makes them noisy but I'm not sure what do you think?

[WinKE55]

Could it be pinging?

 

Have you rebuilt your engine lately and put the pistons back to front or anything?

[neil]

could be dodgy lifter, bent pushrod or pinging. all will make that tap tap tap. if its at idle you would think its the lifter or push rod. good luck

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bad fuel maybe?

[philbey]

Had a similar thing that could be described as "very loud tapping" in my 4ac powered sprinter.

 

Turns out it was a bent valve sticking and just touching the top of the piston. I drove it about 4 kms, and when the head came off, there were nice little knicks in the carbon on top of the slug!

 

Not enough to bust a hole, but it needed a head rebuild after that.

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don't drive it no more and strip it befor it hurts itself...