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Valve Springs
#1239948 Fri Oct 20 2017 12:37 AM
Joined: Mar 2002
Posts: 9,035
Master Gabster
I have a spare 1939 216 that came with my 38 when I purchased it two years ago. I removed the valve cover the other day to have a look at the rocker arm. To my surprise I can actually move the valve springs around that aren't under some compression. I wonder how the motor ever ran like that!


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Re: Valve Springs
truckernix #1239958 Fri Oct 20 2017 01:25 AM
Joined: Jan 2001
Posts: 5,029
P
Master Gabster
I believe 1937-39 had additional springs on top of the lifters which helped with the work.


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Re: Valve Springs
truckernix #1240063 Fri Oct 20 2017 07:25 PM
Joined: Feb 2000
Posts: 4,192
J
Shop Shark
In 1939, the valve spring pressures were set at 49 - 56 pounds with valve closed, 121-133 pounds with valve open. It wouldn't take much seat wear to loosen the valve spring, and since they are weak to begin with, I am not surprised you can move them around.

Re: Valve Springs
truckernix #1240068 Fri Oct 20 2017 07:55 PM
Joined: Mar 2002
Posts: 9,035
Master Gabster
Thanks for those numbers. I was going to look them up but now I don't have to! So in it's last running days those valves would have been held closed by the compression It must have made quite a racket..


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Re: Valve Springs
truckernix #1240079 Fri Oct 20 2017 10:39 PM
Joined: Dec 2008
Posts: 1,490
P
Shop Shark
.010" of wear would reduce the spring tension by about 2-3 lbs.


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