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now how would any one at fixya site know if some body fix the engine properly
WELL no we don't
but we do know that you method of fixing is a failure as short cuts seldom work
Pull the head , have it machined flat , fit new head gasket , use all new head studs and replace any other bolts that are suspect
That will be well on the way to doing the job properly
A torque wrench to tighten the bolts to spec. Necessary tools to remove the head bolts. A gasket scraper for the rocker cover gasket and the head gasket.. If you have a blown head gasket the chances of a warped head is about 98%, so be prepared to have the head machined flat before reinstalling the head. You might want to do a valve job and replace the valve stem seals since you're going to remove the head. If you decide to do a valve job, you MUST do both heads or the engine will never run good.
test the compression, also look for a intake manafold leak, take a can of carb cleaner and spray around were the intake mounts to the cylinder head if the engine smouth out replace the gasket or the injector o-rings.....we do a lot of valve jobs on these engines so do a compression test if below 100 psi remove the head and replace the valves and most likly the valve seats....good luck
Check compression. If its nill or low, pull a plug and look for raw fuel. Try to look at the top of the piston for impact marks. The valve guide comes loose and the valve will hit the piston causing valve damage. Most instances won't damage the piston to a point of necessitating replacement, but will require removal of the head for a valve job or replacement of the head due to valve damage or chipping of the cylinder head at the valve seat. A reman head isn't much more than the machine shop will charge for a valve job. 6 hour job plus gaskets. Don't let anyone tell you it needs an engine without substantial proof.
I have changed a few cylinder heads under warranty for this type of problem. The exhaust valve guides wear, this causes the exhaust valve to seat badly, giving low compression. if one cylinder compresion reading is more than about 50 psi below the others, then this warrants head removal. It is quite a job, due to the fact that the camshft id chain driven. If you are up for it then once the head is removed, poor liquid into the exhaust ports and see if it leaks out through any of the exhaust valves.
you either have a cracked block or the head job they did is not good. It is very easy to screw up a head job. Also they may not have put in the right gasket. If they had to shave a lot of the head off, then you need a thicker gasket. If they used the standard head gasket will break or leak again.