Hi Guys,
So I decided to do a couple of tests on the old girl due to the fact that I have a cold start problem (mentioned in earlier thread) and I plan on tossing in a turbo soon.
I did a compression test and a leak-down test, the compression was done with a Hastings (now JET) diesel tester and the leak-down with a Milton unit which uses around 40PSI to test.
Now the engine is a 3B, Sept 83 production, with 428,000 on it and nothing has been rebuilt.
Here are the numbers:
Cylinder............Compression.........Leak-down %........location of leak
......1.......................505.....................25....................Intake valve
......2.......................510.....................23....................Intake valve
......3.......................475.....................50....................Intake valve
......4.......................500.....................47....................Intake valve
I know that higher that stock numbers are also not good and I suspect that the numbers are higher because of the carbon build-up. I suspect that the valves are not closing properly also due to carbon and during compression (especially at that pressure) they get pressed in a bit more.
I have done the valve adjustments not too long ago, rebuilt the injectors, new glow plugs.
So does anyone know of a good, proven product that can assist in removing carbon build-up and not cause damage to the engine components?
Most of my mechanical experience is with gassers and in this case a little Methyl Hydrate in the fuel would clean up a lot of things.
Thanks in advance for any input.
So I decided to do a couple of tests on the old girl due to the fact that I have a cold start problem (mentioned in earlier thread) and I plan on tossing in a turbo soon.
I did a compression test and a leak-down test, the compression was done with a Hastings (now JET) diesel tester and the leak-down with a Milton unit which uses around 40PSI to test.
Now the engine is a 3B, Sept 83 production, with 428,000 on it and nothing has been rebuilt.
Here are the numbers:
Cylinder............Compression.........Leak-down %........location of leak
......1.......................505.....................25....................Intake valve
......2.......................510.....................23....................Intake valve
......3.......................475.....................50....................Intake valve
......4.......................500.....................47....................Intake valve
I know that higher that stock numbers are also not good and I suspect that the numbers are higher because of the carbon build-up. I suspect that the valves are not closing properly also due to carbon and during compression (especially at that pressure) they get pressed in a bit more.
I have done the valve adjustments not too long ago, rebuilt the injectors, new glow plugs.
So does anyone know of a good, proven product that can assist in removing carbon build-up and not cause damage to the engine components?
Most of my mechanical experience is with gassers and in this case a little Methyl Hydrate in the fuel would clean up a lot of things.
Thanks in advance for any input.