Quote:
Originally Posted by Diesel911
I am assuming you filled the Intake and Exhaust ports with some sort of fluid to see if there was a leak.
If you did this with the Head laying on the side Fluid can also leak out of the Valve Stem Seals.
But, what you are really looking for is to see if Fluid is leaking past the Valve Faces/seats. If Fluid leaks out fast there you need to do a Head Job that requires removing all of the Valves; seeing if the Valves and Valve guides can be reused and grinding the Valves and seats back to the Manuals specifications.
One Question is what did you use as the Fluid for the test?
Next is what type of trouble were you having to begin with?
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I used kerosene...
I was using it to get some of the soot out, so I also decided to do a leak down test with some....
the car was almost impossible to start and when I finally did with lots of cranking some push starting there was a massive miss fire and if you didn't hold down the throttle almost full it would just stall.
when I did the leak down test 5 of the 8 valves didn't hold and kerosene (don't worry I made sure that the cam lobes were fully closed for that pair and not even slightly open as to let the fluid through) just started coming through the intake/exhaust manifold holes in the head, only the intake and exhaust valves for the first cylinder held fluid.
Also is it OK to scrape some of the soot off the pistons with say a hacksaw blade or a flat screw driver?