Posted by HeyObie on December 02, 2012 at 11:25:28 from (74.106.225.13):
I am doing my first valve job on an 8N. I have all the valves out and I am trying to decide if I should replace any parts.
I have owned this 50 side mount for 25 years and have done nothing to the engine. So it is time. The engine lost compression 95 95 70 70 from 1 to 4.
I pulled the head. Could not see anything that was bad to me, but I don't have the trained eye. But the bottoms of the intake valves do not shine like the bottom of the exhaust valves. The intake ports are black. Whether it is oil or exhaust I can not tell. But to me they should be clean and not black
I plan on lapping the valves. But not sure if this is the right plan.
With all that said, my questions are:
1 - Should I replace the valve guides and valves. There is a very very small amount of play between the valve and the guide. Should there be NONE?
2 - Should I replace the springs? I don't know if these are original. They are green. The replacement ones I see are not green. So I assume these are original and if so, they are 60 years old.
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