Morning Sepp and P.J.,
Lots O' people will tell you that if you’re operating your truck in a warm climate that you don't need the heat riser. So believe what you will, but we’re not talking about a choke here but an automatic device to get the manifold up to temperature so the fuel will vaporize rather than condense. Even though the engine is sitting out in the 90° sun, that’s still not hot enough to vaporize the fuel as it travels into the manifold.
Take a few drops of gasoline and splash it on to a warm iron surface and then onto a hot iron surface and difference is quite obvious (NO OPEN FLAMES HERE). The longer you delay this the longer you will have fuel pooling in the manifold. This washes down the cylinder wall and dilutes the crankcase oil. It can take 15 to 20 minutes for the engine to come up to temperature, and that long to heat the intake manifold without the heat riser operating. The intake comes up to temp much sooner with the heat riser operating like it was designed to do.
So, keeping it free and adjusted properly in any climate will add many miles to your engine.
Sepp, if your spring is just sitting at the end of the slot 9 times out of 10 the old spring as broken off and a piece is still in the slot. If you try spreading the slot in the shaft 9times out of 10 you will break one of the legs off the shaft. The thermostatic coil is originally slipped all the way to the bottom of the slot and then it is squeezed tight. Again, the shafts break very easily when you try to spread them, BE CAREFUL!
Denny Graham
Sandwich, IL
Last edited by Denny Graham; 11/04/2010 4:50 PM.
