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Reload this Page M18 Oil Pressure issue
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Old 09-25-2018, 09:50 PM
Gompers Gompers is offline
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Join Date: Jun 2017
Location: Des Moines, Iowa
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Originally Posted by ol'George View Post
I can't tell you if the last Kt blocks were the same as mag blocks as I don't have a late kt block to compare to a mag block.
I do know they eliminated gaskets and went to RTV sealant,and caution that if the pto cover had a gasket, to reinstall with one.
That would indicate the .020 or so gasket thickness, was taken care of in the cover, not the block.
I personally don't think it is critical as far as the cover with or without a gasket.
I think the series 2 had the thick webbing but can't swear to it.
Don't disrespect a series 2 block without an oil filter provision.
Production went to many manufactures that didn't request/require it so it was not provided by Kohler.

The jugs on the late mags went to a *30 valve & seat angle.
Also the right & left jugs were different in at least 2 ways.
One for a magneto mounting, also a hardened valve seat for the exhaust valve.
So while the jugs will bolt on, they would not have the correct valve seats and the mounting holes for magneto mounting.
IIRR also the camshaft has a different part number for the *30 valves
it is covered in the service manual.
But again I don't see why either cam will not work in either magnum block.
other than the mag cam has no lobe for ignition point activation if installed in a kt block.



.
Currently sitting on about 10 complete KT17s. 2 series 1s and 8 series IIs.

I have about 50/50 oil filter blocks and non-oil-filter blocks for the series IIs.

I just snagged a KT a couple weeks back that has a 1997 serial number on it (oil filter block), so they must have made both the M18 and KT17 at the same time for quite a while. It doesn't look any different than my other KT SII oil filter blocks, but I'm not going to tear it down to find out since it allegedly runs really well. Just seems like it would be a waste of resources to keep two different castings around if you're making basically the same engine.

I seem to recall in the M18 service manual that the jugs were swappable until the 30* valve change. The bosses are on even the KT jugs for the magneto mount, but they'd need to be drilled and tapped obviously .
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