Swapping engines

973 Views 5 Replies 4 Participants Last post by devans, Oct 16, 2015

Yokomo99

Discussion Starter · Oct 15, 2015

I am going to swap the engine on my parts 74 816S to my 73 816S and I was wondering if I should use the gear and thrust bearing from the 73 or use the one that is on the 74 engine. Basically what I am asking is the washer, gear and thrust bearing sized for the transmission or the engine adapter plate? I may be overthinking this but I don't want to ruin anything if I can help it. TIA :dunno:

Matt

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Canary Al

· #2 · Oct 16, 2015

I believe what the issue is on this Matt is the gear must stay with the transmission.

They two wear in together and putting a different gear with the transmission - one that it has not been there from the beginning, may cause a whine - forever.

My 8183 was repowered with a newer model MS18 engine before i acquired it. It has an annoying always present whine. Yet it performs like a champ

I have been told by knowledgeable people on here this is the likely cause.

I inquired as to if messing with the shimming might eliminate it? The answer was, not worth trying, likely will not help at all.

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devans

· #3 · Oct 16, 2015

I don't know if this is right or wrong but my gut tells me the same thing Al just said. Keep the gear and transmission together. I changed out my transmission on my 816, didn't get the engine gear with it and there is a whine too.

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Fla Don

· #4 · Oct 16, 2015

Just make sure that the distance from the end of the gear to the adapter stays the same when you swap gears.

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Yokomo99

Discussion Starter · #5 · Oct 16, 2015

That is the info I was looking for. Would changing the existing adapter plate along with the original gear, bearing and spacer to the new motor be a good idea? That way the gear spacing should remain the same.

Matt

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devans

· #6 · Oct 16, 2015

Matt,
I don't know what the tolerance for machining the adapter plate was that the gravely engineers and designers dictated but I can't imagine it would be so big to make a difference between one adapter plate and another. I'm thinking just a few thousandths of an inch.
But if it would make you feel better and while you have it apart just swap the adapter over too. It shouldn't add a lot of time to the job.
I should add that I don't have a bunch of experience with the adapter plates but I do have many years of machining experience.

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