Valve Guide Seals

[Chris-8n]

OK the valve guide kits have 8 seals in them, but I only see seals
on the intake valves. Do the other four go on the exhaust valves?
On all the engines I have taken apart, there were only seals on the
intake valves...Help!

Chris-8n

 

[Dunk]

(quoted from post at 18:41:23 06/14/08) OK the valve guide kits have 8 seals in them, but I only see seals
on the intake valves. Do the other four go on the exhaust valves?
On all the engines I have taken apart, there were only seals on the
intake valves...Help!

Chris-8n

It's your tractor, you *need* them on the intake, I can't remember if my last rebuild I put them on the exhaust or not.

It is not necessary to have them on the exhaust.

Don't just take my word for it though, wait on some of the others.

 

[Mike OH]

I only put them on the intake as well. I was told they were not needed on the exhaust as they would probably burn up. Good thing I had extras as I spoiled a few trying to get them installed.

 

[gahorN]

Think about how the valves work.
Intake valves open up and allow the descending piston to SUCK air/fuel/oil/whatever is available into the cylinders. If oil is all over the valve stem it will suck oil into the cylinder.

Exhaust valves open up and allow the ascending piston to BLOW burnt fuel/air/oil mixtures out of the engine and out the manifold.

The valve stem seals are intended to prevent excessive oil burning. Since only the intake valves have SUCTION applied to their stems, they are the only ones that need seals. (The crankcase vent allows any blow-by that gets by piston rings and ex. valves to vent to atmosphere.)