Could any compression pressure leak out of any of the holes resulting from the removal of peripheral A4 parts? I have removed several items from the engine: Delco Starter, Carburator, Water Jacket Side Plate, Cover to Reversing Gear, Exhaust Pipe (had to in order to remove the engine), Flywheel Cover. I have not removed nor adjusted any of the head or manifold nuts, which are still intact as they have been for the last 20 years.
I am concerned, because I bought a compression guage and after checking compression in all four cylinders, the readings came back very low, between 30 and 60 psi. I am concerned about the validity of the readings, because before I hauled my engine, it had power to run at 2000 RPM, pushing the boat at 5.5 knots (but a few other concerns promped me to pull the engine - compression was NOT one of them - see my other thread "Engine Rattling and Low RPM").
All four plugs are removed, and rotating the crankshaft around with the compression guage firmly screwed into any spark plug hole produces very little compression on the guage. I can also put my thumb over the open hole, and can keep it there on #1, #2. On the other two, a little air leaks past my thumb, and those are ones reading about 60psi.
Thoughts?
John
I am concerned, because I bought a compression guage and after checking compression in all four cylinders, the readings came back very low, between 30 and 60 psi. I am concerned about the validity of the readings, because before I hauled my engine, it had power to run at 2000 RPM, pushing the boat at 5.5 knots (but a few other concerns promped me to pull the engine - compression was NOT one of them - see my other thread "Engine Rattling and Low RPM").
All four plugs are removed, and rotating the crankshaft around with the compression guage firmly screwed into any spark plug hole produces very little compression on the guage. I can also put my thumb over the open hole, and can keep it there on #1, #2. On the other two, a little air leaks past my thumb, and those are ones reading about 60psi.
Thoughts?
John
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