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I have a Toyota owner Jeep. Had a blown head gasket, most likely cause it got over heated. I removed the head and had machine shop do a valve job and had the head re-surfaced, put together, set the valves to the spec's called for, no problem till I started the motor.

It made some load clacking noise, so turned it off. I checked the rockers. I found a bent push rod in number 4 cylinder. I took the head off again, back to the machine shop and they found a broken valve guide and also put in a new exhaust valve.

Back home, another new gasket set, set the valve adjustments again. All is ok till I started the engine again, then, clack noise was back again, turned it off.

This time it was the push rod in # 3 cylinder bent. So I have to wait till the 5th of april to get it tore down again.

I think its going to be another broken valve guide and will also need a new exhaust valve.

What could could be the problem?

I'm afraid to do this again.

DucatiKiller
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mike004006
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2 Answers2

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Sounds like there could only be two main causes here:

  1. Engine timing, I would say that it is the most likely cause, have you used the factory timing marks? Always turn the engine over by hand at least twice. The cam could be a complete turn out.

  2. Valve clearance is way to tight, I find this unlikely because something would have to be going majorly wrong to adjust the valves to tight that something bends.

Newbie Noob
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Maybe you put the intake pushrod on the exhaust side vice versa. If they are different sizes make sure they are on the right side.

Darryl Develle Black
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