Engine
A" or "B" ENGINE?
Question :
I purchased a Model A two years ago. The gentleman that restored it passed away, and I purchased it from his widow. A friend of his told me it has a Model B motor. How do I know this for sure? Is there some noticeable difference. The exhaust manifold has recently cracked. I don't know if I should have it welded or try to replace it. But either way I need a gasket set. This is the reason I need to be able to identify it. Also could you explain the difference between the two motors to me.
Answer :
There are several noticeable differences between the A and B engines.
- The Model "A" engine has a oil return tube on the right side of the engine, that extends from the lower left corner of the valve cover to the lower right corner of the block. The "B" engine has no external oil return tube.
- The Model "B" engine has a small port on the right side just below the valve chamber cover for a cam driven fuel pump. This port will either have a fuel pump attached or have a triangular shaped plate covering the hole.
- Both engines use the same manifold gasket. The "A" and "B" manifolds are interchangeable for either engine. The differences in exhaust manifolds is the angle of the exhaust tube at the end of the manifold. The "A" is at about 90 degrees (drops almost straight down) and the "B" manifold drops off at about a 45 degree angle.
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