D17/Gleaner E M coded engine valve specs
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Topic: D17/Gleaner E M coded engine valve specs
Posted By: jbirnsch
Subject: D17/Gleaner E M coded engine valve specs
Date Posted: 30 May 2017 at 5:42pm
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I have the head off on the Gleaner E m coded engine I'm planning on putting into a WC. I pulled the valves out and they have quite a groove in them. Some of the exhaust seats have pitting. I have a Black and Decker valve grinder and a Sioux seat grinder here in the shop I bought from my great uncle. The exhaust valves are 45 degree and the intake valves are 30 degrees in this engine. How much margin on the top of the valve is acceptable after grinding to clean up the valve surface? I have read that 1/32" minimum is acceptable. How much seat contact area for exhaust and intake valves is required? I have read from .060" to .080" for exhaust and .040" to .060" for intake valves. Seat contact height is also needed for the intake and exhaust valves. I have read form -015 to .030" from the top of the valve is preferred for proper cooling. Finally what is the valve stem protrusion height? If I have to take the seat down .005 to remove pitting will I need to use valve spring shims or take some off the valve stem face? Any help here is appreciated. I'm trying to do this myself instead of taking it in. This will maybe see 5 hours of use a year. I really don't want to sink in a ton of money in it. An engine gasket set is going to be the biggest expense.  |
Replies:
Posted By: jbirnsch
Date Posted: 31 May 2017 at 7:51am
| Added that the D17 used the same engine. If anyone has the D17 valve train specs they would be the same. |
Posted By: Brian Jasper co. Ia
Date Posted: 31 May 2017 at 11:49am
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I recently ground the valves on my M engine, haven't gotten to the seats yet. They looked pretty grooved, but cleaned up nicely. I know I have a lot more than 1/32 margin left. The main thing I was always told was you don't want a knife edge for a margin. You'll just have to grind them and see what you have left. I don't know what the installed height is supposed to be, but when done check the arm to stem tip contact. Ideally you want to have an equal amount of sweep on both sides of the stem to keep guide loading as low as possible. Unless you are trying to build a high RPM engine, it's going to be fairly forgiving with on seat and over the nose pressures. ------------- "Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford |