Head Noise Question

[chrisfullwood]

I suspect that the valves are bent. however!

The tensioner went on my car. i checked the compression, it showed 120psi, and bled off to zero after about 10 seconds. it starts and runs, but makes a tapping noise.

however i have pulled the head. and the valves seem to seal, i cannot see any visible damage.
Is it possible, that because the tensioner was blown, it was allowing the cams to turn just a little bit, making it tap.

Im about to send the head off to rebuilt. but if i can save 400 bucks i would like to.
ive looked for some pictures to see if i can make a comparison, but didnt find any, so i thought i would ask.
thanks.
Chris

 

[turborebel]

You can have the head vacuum tested. This test will tell you if all your valves are seating properly. Did you do a wet test?

 

[dsm-onster]

Please don't run your engine w/out proper tension or a blown tensioner. . .

Wet test: You can lay the head flat w/ the combustion chambers up, and pour kerosene into the chambers. If they don't leak down you may be ok. I admit this is crude. But this should show you if the valves are seating properly.

I recommend a vacuum test too. I don't think they are expensive.

 

[chrisfullwood]

I pulled the head off. no visible damage to the valves. or pistons.

valves seem to be seating fine, my engine machine guy came out, looked of the head, and pretty much went with my theory. that there was slack in the tensioner which allowed the valves to be open just a little bit to make them tap.

however he has taken the head, is doing a complete valve job, including a port and polish to make it breathe better.

should be a couple of weeks probably, will have it back.

now just need arp head studs. and some new turbo to exhaust bolts (stripped 2 of them) anyone know where i can get some good high quality ones?

thanks

 

[dsm-onster]

SBR has Mitsubishi manifold to turbo bolts, and o2 housing to turbo bolts and stud, and manifold to head bolts. They are a supporting vendor

 

[chrisfullwood]

cool, thank you

i shall check them out.

i tried to find SBR...? whom might they be?
thanks.

 

[dsm-onster]

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