1979 446 Engine Too Good - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
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post #1 of 2 Old 01-23-2018, 08:08 AM Thread Starter
Hemlock Case Guy
Join Date: Mar 2013
Location: Michigan
Posts: 293
1979 446 Engine Too Good

I find and fix Case and Ingersoll as my hobby. My current victim is a very customized 446. None of that is staying so I won't explain what was done there. But, as soon s I removed the head tins I found the block to be much newer than 1979. I have to check with Boomer yet for the exact year. My clue was a block off plate for an oil filter and the pulse line for the fuel pump was not on top of the engine but down by the oil filter plate.

So, I have an engine that can take a filter which is always good. Then next I hooked the leak down tester to each cylinder and leaks at the valves, don't matter at this point. I always do a decarbon and to me, that includes cleaning the valve faces and lapping them until I can hold liquid when they are closed. The test results were zero leaking on each bore, even though the engine is cold. The only slight leak was at the intake valves. That is common as the carbon does not get burnt off and instead collects on the valve face and seat.

The reason that is too good is I have a new to me 646 that has the older styler Onan CCKK engine in it. This is the one I am going to keep for myself and I would much rather sell the CCKK and keep the newer engine.

That means it is a 2 tractor project, not a simple fix and sell project. But, I love that I will have a 1975 646 with a much newer engine in it.
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post #2 of 2 Old 01-28-2018, 06:54 PM Thread Starter
Hemlock Case Guy
Join Date: Mar 2013
Location: Michigan
Posts: 293
I didn't get far into it after I talked to Boomer. Yes, the engine in the 446 would work in the 646, but not the other way around.

I took the heads off and found that a screw, likely a carb screw went through one side. The intake valve was a bit dinged up but cleaned up fine after a visit to the local repair shop to have the valves refaced.

Lapped and re-installed them. Filled the back cavity with mineral spirits and no leaks.

Now to add the engine filter option and rebuild of the carb and back into the what is now a 446-8. The engine turned out to be an 18 hp.

The clutch was a mess and will get new bearings and assembled correctly. Someone must have tried to remove the bearings. There are punch holes in the seals. Nice.
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