1811 onan repower

[gears]

Through the grill

[goonpeden]

My fault, didnt mention it was the tensioner pulley on the mower deck. Everything else lined up perfectly. The tensioner on my deck was only a year old and didnt want to take the chance of burning up another. As for the exhausst, I had about six sets of sidesheilds so just drilled a hole in one with holesaw and exited it out the side.

[Leadslingingdaddy]

How many hours are on that Onan?

[gears]

I think it's around 600 or so. The Kohler made it 1015 before letting go.

What should I be watching for on the Onan? Everything looked good, signs the oilpan was already resealed, checked all the bolts. I did not decarbon it - wanted it in and running before committing to ordering headgaskets.

[Oak]

Cool build...I've been watching.

Make sure you have a good seal between the firewall and the engine shroud. You don't want to be sucking hot air from around the engine you want it to pull cooler air from the back side of the firewall. Some P series have issues dropping valve seats when they are overheated. You may want to do some tin work around that muffler to keep the heat out from under the hood too.

You may want to look at changing your center pulley on the deck to slow it down a little. I've not done anything like this yet but this one may work.
https://www.ihccw.com/mowerparts.htm...4880&limit=100
this one is a little cheaper
https://www.ebay.com/itm/For-MTD-Cub...ty!30107!US!-1

Here are some Cub Cadet Onan mufflers to give it that awesome sound. They have been on there for a while so I would make an offer.
https://www.ebay.com/itm/Cub-Cadet-1...AAAOSw-ERc-TQx

Check your valves and watch for the intake manifold splitting and sucking air. China has gotten in the market on Onan's(don'tknow why). Here are some gaskets....don't know if they are any good but at that price I would try them.
https://www.ebay.com/itm/New-Onan-BF...d7c3e1904b2d69

I'd pull the hour gauge and mount a 0-50 psi oil pressure gauge then remount the hour gauge under the hood somewhere.
https://www.ebay.com/itm/NEW-WHITE-O...item3b3c316e5a

If you keep it full of oil and running cool that engine has many hours left on it.

[gears]

Thanks for the feedback Oak. I don't think I'll put different mufflers on, looking to do with what I have lying around rather than what I can buy for it - good price on them though. I suppose I'll fab some shrouding up to the front cowl as a muffler box to get heat out.

Oil gauge is a good idea, I'll have to find where it's got a port to get the pressure from - hopefully it's not too buried under the shrouds.

As for deck speed, I just figured I wouldn't run WOT while mowing. The 44C deck has all the same size pulleys, I thought I'd read where there was an "overdrive" situation you could do by putting a smaller Deck pulley on the upper center spindle. I just figured I was doing similar by the larger PTO drive pulley.

[Leadslingingdaddy]

My experience with Onans in the Green Tractor Dept...318's is worry starts around 12-1500hrs.... make sure those fins are clean...

[gears]

Yeah, cleaned and blew everything out (some scraping required). Looking at the front end under the tins - anyone got a pic of the heat sheilding that's supposed to be on the original? The Kohler didn't have anything over the muffler, just side shields. My old Ford LGT has the exhaust shrouded to the nose. My simplicity is open air.....

[ironman]

Originally Posted by gears

Yeah, cleaned and blew everything out (some scraping required). Looking at the front end under the tins - anyone got a pic of the heat sheilding that's supposed to be on the original? The Kohler didn't have anything over the muffler, just side shields. My old Ford LGT has the exhaust shrouded to the nose. My simplicity is open air.....

maybe this?

[ol'George]

yep that would be correct for the double breasted kohlers.
KT through Mag series