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Discussion Starter · #1 ·
How hard would it be to transplant this into my 446? I think there might be an issue with the crank end for the pump drive I think it has a short tapered shaft not sure though.

Mark
 

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The transplant isn't much of an issue. The engine will bolt right up to the frame along with the pump and clutch once you sort out the crankshaft issue. There are adapters to convert a tapered shaft to a straight shaft.
 

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Onan Master, new and used parts.
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mark
what year and S.N. is your 446.
this will make a difference, as to the carb and air cleaner.

as to the tapers my manuals show taper usable length
from 1.250 to 4.04 ( all to long )
the usable length on the case/onan is 1.060
mark, also i have a P218 specd. for the case ( proper starter and crank )
for sale
it has about 200/ 250 hrs and was removed from a 86 446
if itn. e/mail or call 651 437 2826
thank you. boomer ( the used onan engine parts guy )
 

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Onan Master, new and used parts.
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mark
the p could be a problem for your 76.
if your exh. pipes screw into the block
you would have to pur.a later model set of exh. pipes, that bolt to the block.
other problems
fuel pump pulse port location
breather location, remove it and plug the hole, and install your breather in # 1 tappet cover
air cleaner to wide, install your carb and air cleaner.
so, in my opinion you may want to shy away unless you get a really good deal.
good luck. boomer
 

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Discussion Starter · #8 ·
boomers_influence said:
mark
the p could be a problem for your 76.
if your exh. pipes screw into the block
you would have to pur.a later model set of exh. pipes, that bolt to the block.
other problems
fuel pump pulse port location
breather location, remove it and plug the hole, and install your breather in # 1 tappet cover
air cleaner to wide, install your carb and air cleaner.
so, in my opinion you may want to shy away unless you get a really good deal.
good luck. boomer
Do you mean to shy away from the Onan 20hp Boomer? He said something about if he sold it he would have to get $500 out of it.

Mark
 

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Hydriv said:
The transplant isn't much of an issue. The engine will bolt right up to the frame along with the pump and clutch once you sort out the crankshaft issue. There are adapters to convert a tapered shaft to a straight shaft.
I have an opportunity to pick up a couple of generators. But, I haven't located a source for the adapters mentioned.

Anyone have a reference???

The generators are a good deal, if I can source the adapters, not so much if I need to do a complete teardown.
 

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Onan Master, new and used parts.
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ken
i posted about the taper crank length in one of my first post.
i looked at the crank chart that you posted .
from that i determined that all of the taper cranks are too long. ( for 400 series case )
also i think there are different angles of the taper.
thank you. boomer
 
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