summer winter valve - Steel Soldiers::Military Vehicles Supersite

Channing · 03-02-2010, 11:52

The summer winter valve on my exhaust manifold which way is summer and which winter?? Is there any tricks to freeing up the control before I start?? Anything else I should know. ?? Thanks Channing

dan labarge · 03-03-2010, 09:46

maybe start by taking it off the truck so when it brakes like mine did,you'll have it on the bench and fixit faster. Dan

rosco · 03-03-2010, 11:23

I have always just set them in the center position, and forget about it. I think it was supposed to produce more carb heat, in the winter. Dan has a good feeling for them. Some of the other early vehicles, like the Internationals, in line sixes, had the flapper on a heat sensitive spring, so as the engine warmed, it would open the flapper. Not sure if they had a measurable effect on the engine, either way. The gas consumption of the M37 was always bad to worse, 4 to 5 mpgs. But its my idea of a "four wheeler", and I still use it daily on the ranch. The neighbor Kids are impressed!

To answer the question, having the flapper deflect the exhaust upwards toward the intake manifold is the winter position. I don't remember which way that is, without seeing it.

Lee in Alaska

Channing · 03-04-2010, 22:25

Well mine is set in the middle I will make one attempt too free it up without breaking it. Or I will leave it a loan. Thanks For your help

pwrwagonfire · 03-07-2010, 21:14

Darn...I have the answer for you, but its at home in my M37 tech manual...

There is a picture in there with the specific explanations for it. Maybe somebody could look it up in theirs for you

Channing · 03-08-2010, 10:56

Thanks I found it I think my pages were stuck together