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4 Broken Heads

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AWDfrank

15+ Year Contributor
242
2
Jun 1, 2005
Bakersfield, California
Before I write anything this is my cousin who is having these problems not me so I don't have all the details. I also didn't help work on the car, i'm just posting this for him.

2 years ago the car was bought by my cousin's friend with the head in the trunk having been told the timing belt snapped. An old lady owned it and since the repairs were to much they she never fixed it.

The friend had the head rebuilt, resurfaced, everything that is needed and put it back on, started fine. 10 minutes later there was a lot of chaterring, bent the valves.

Rebuilt the same head put it back together and the same thing happened.

I know what your thinking, obviously something is wrong so dont do the same thing but they did.

He then sold the car to my cousin who rebuilt the SAME head and he put a new gead gasket on resufaced it...upped the boost to 13 psi and the head gasket blew on him!

He then took took the head off put a new gasket on bled the lifters and did everything right (he thinks). After driving for 2 days he parked the car for 5 hours, started the car up and the loud chattering was back...the valves bent again

He told me the whole story and it turns out that he had figured since his friend had changed the timing belt he naturally changed all the timing components...wrong. Besides the timing belt all the other timing parts were stil on it for who know how many thousands of miles before the lady had the belt break.

A completely NEW head is going on now, and I advised against it but he is using an ebay timing kit (which they said is the same for 6 blot and 7 bolt?)

Do you guys think the same thing will happen again?

Do you think the timing jumped on it?

What other parts could cause the head to mess up 4 times, the same head itself?

I know thats a lot but its like a 2 year ordeal...btw I know they obviously should of done something different after 4 times LOL.
 
Get a new head...Sounds like its been decked too low, so the valves now sit that much closer to the pistons....I read somewhere that it should only be re-surfaced like 2 or 3 times at most.

I say with the new one your putting on, it should be ok as long as you put it on properly, and also with the timing too...If its done wrong, it doesnt matter what you have.

Did the valves damage the pistons at all? Id check that out.

Oh yea...Try to talk em into using OEM parts for the timing belt...Whats the point in spending the time and money if its just gonna fail? Granted not all ebay stuff is crap, but ehh....Its the whole engine thats at risk.
 
I agree with the_skin_eater. The head probably has been machined way to many times.
 
Don't forget to PROPERLY install, torque, re-torque, and re-re-torque the head studs. I'm sure you're well aware of the process. Just putting it out there in case your cousin is not.
 
When I had my head resufaced the guy I took it to measured it and told me exactly how much was milled off, making sure it was within spec and the likes. How reputable was the machine shop that rebuilt the head?
 
Well the first time i said it was put back together was the first resurfacing. Then it had 3 more, but it bent the valves on the 1st resurface, 2nd and 3rd.

There were two seperate shops who did the resufacing, i wouldn't trust the last shop to work on the head.

So do you guys think it was the timing parts causing the timing to jump and bending the valves?

What else could contribute to bent valves?
 
Probably an OLD timing belt tensioner or old pulleys. 6 bolt and 7 bolt engines do NOT use the same timing belt kit, the tensioner is different. If he uses cheapo parts on it then he gets what he deserves.
 
sounds like the head is either decked to low or your tensioner is junk and your skipping alot, the ladder seems more plausable to me since it doesn't bend the valves right away....
 
If the pistons are nicked I wouldnt use em...Unless it was just like a scratch...

I dont know how much you can get away with on that one, but its bad either way....
 
ok, ok, ok. i've read both threads. i had the same problem when i rebuilt my engine this last time. sounds like you've got a deisle 4g63. i finally found my problem after one of the wiser DSMers pointed it out to me. the timing marker between the crank sprockets IS NOT SYMETRICAL. you need to make sure that it's on correctly. from my experience, this isn't clearly stated in the FSM that i used, maybe in other versions it is, or maybe i just overlooked it this time. if you put that little piece on backwards, it'll really throw your timing off.

you really need to have a timing gun which was what helped me to quickly diagnose that my timing was severely off. all of your timing marks should line up perfectly if you have the belt and sprockets all installed properly. mine wasn't quite right, and i didn't think it would be that big of a deal. boy, was i wrong. this can be catastrophic, as you're seeing with your multiple rebuilds. this sounds like it's getting really expensive. you need to remedy this.

i'll take a few minutes and find the thread i had about this similar problem.

found it: http://dsmtuners.com/forums/showthread.php?t=243263
thanks a lot to dsm90awd
 
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