adjusting valves

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adjusting valves

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adjusting valves

Postby 68impalass » May 12th, 2018, 8:27 am

Here is one I don't understand. I removed the valve cover to adjust valves and noticed there is no valve seals on the exhaust valves. In the 40 years I've worked on engines I have never seen this and the books verify this. Is it OK to install seals on these valves?
m151A2-have
M37-gone
m151A1-gone
M1009-gone
m275-gone
MEP17A-have
MEP16C-have
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Re: adjusting valves

Postby rickf » May 12th, 2018, 8:35 am

You can but exhaust valves are under pressure and intake valves are under vacuum. So exhaust valves do not usually need seals since the oil is pushed out of them. You can install them if you like but keep in mind that exhaust valves are much hotter than the intakes.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone
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Re: adjusting valves

Postby Fil Bonica » May 13th, 2018, 1:35 pm

Wouldnt seals burn and fail quickly if installed in exhaust valves?

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Re: adjusting valves

Postby rickf » May 13th, 2018, 3:20 pm

On the m-151 probably. On some other engines with water passages on that side of the head the valve stems will cool off enough so as not to destroy the seals. The M-151 does not have water passages on that side of the head.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone
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