Quote:
Originally Posted by ol'George
While the series 1 is the same basic design, the oiling system is where it lacks.
It does share the same oil pump as the series 2 and magnum, but does not have an oil pressure relief spring, thus the low pressure.
Also the crank is not cross drilled to pressurize the rod journals, they rely on 2 drilled holes in the hollow camshaft to squirt oil toward the rod journals every other crankshaft revolution ( camshaft turns 1/2 crank speed)
so, while many are still running, it is not as desirable a system, compared to the improvements that the series 2/mags have.
Also the 2 and mags, have more and heavier webbing in the block as well as the mags have a larger diameter crank at the oil seal area for flywheel support.
As the Kohler engines were used in many applications like skid steers etc. they felt a need to strengthen that area of the crank.
I would not consider a series 1 as a replacement engine, but a series 2 and magnum would be a nice bolt in.
Understand,
i have nothing against fellows going to modern OHV designs.
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George I know there are at least two different SII crankcase castings, one with oil filter and one without. Do you know if both of them have the additional webbing?
Also, do you know if the later SII (with bypass/oil filter provision) casting is identical to the M18 casting aside from being drilled for the points?
I know they were making KTs up until the 90s, and I can't imagine they would be making both engines with two different crankcase castings when they are identical.