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Wendell Bragg

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9020 Restore/Resurection

wwbragg

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Been sitting around for 5 years and finally coming to the top of the Queue.  Saw it on craigslist and immediately called at around 8PM.  It was located about two hours away so I asked the guy if he would hold it for me.  He said no, as he had other interested parties.  I asked if I could come up that night.  He said, "You want it that badly"?  I said, "Yeah, I have been looking for one."  So he said he would hold it.  Got it the next day for $350.  It came with a 5 ft deck, front blade, rototiller and a vacuum system but no gas tank.  

When I brought it home, I got it to fire by squirting fuel into the carb.  I added a gas tank but now it won't run and the starter seems to have died.  I tried to use an impact drill to turn it over for a compression test but no.  Rather than start throwing parts at it, I decided to repower with a Predator 670 Honda clone.

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First step is to pull the old Onan.  I will probably try to sell it so I didn't want to use the Onan dual pulley on the repower so I ran a "wanted"  ad in classifieds.  CTD01 had one at a reasonable price (thanks, Paul).

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The next step is to build a flywheel adaptor.  Small Engine Warehouse used to use the Honda 670 in their repower kit so they used to have an adaptor.  But they have switched to the Briggs twin.  The Briggs repower kit is around $1800 plus shipping.  The Predator came up on sale for about $730 and is 25 miles away.  Oh dear.  What ever shall I do?? 

So I started measuring and came up with this:

Now, when it comes to 'beat to fit and paint to match' I have no equal.  But I lack the precision tools needed for this thing so with a 4" aluminum round I headed off to my local machine shop.  $150 later, I have an adaptor.

 

 

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maxwood

Posted (edited)

Hello, Here is a plan, that I used to repower  a sovereign  with a predator 22 hp.  I used the rubber donut and the kohler cast iron adapter.

Your adapter looks very good  ,nice work!

 

Thanks Ken In Mi.

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Edited by maxwood

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wwbragg

Posted (edited)

The Predator/Powermax adaptor must not only connect directly to the shaft with the fiber disk (which on the Powermax is the rear PTO) but you have to use the Onan flywheel pulley to run the main drive line.  It has to clear the engine fan so it has to be at least 2" thick and it has to be wide enough to hold the fan to the flywheel. 

The adaptor and pully assembly is pretty heavy.  That, along with the strain that will be imposed by the drive line, well frankly, I am a little worried about the extra strain on the bearing.  I guess we'll see.

Next step is to build a mounting platform to raise the Predator  3 3/4" off the frame.  My first thought was to use a couple of 4x4 (actual 3 1/2 x 3 1/2)wooden blocks with a 1/4"  steel plate on top.  But then I wouldn't get to practice with my welder.

PS:  Anybody know the correct torque on the Predator flywheel bolt? (M12 - 1.25)

 

Edited by wwbragg

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wwbragg

Posted (edited)

Here is a shot with the adaptor and pulley mounted on the motor.  I had a hard time finding the correct torque for the flywheel bolt.  Research yielded readings from 87 ft lbs to 95 ft lbs.  The firm where I bought the bolt wouldn't tell me anything because I had die cut threads back past the original threads.  He told me that cut threads are not as strong as the original rolled threads which I did not know.  I settled on 90 ft lbs.

Now to fabricate the mounting plate which has to be 3 3/4"  off the frame.  Not correct.  The mounting plate needs to be 3 1/4 off the frame.

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Edited by wwbragg

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Hello, That is some great engineering. How are you going to modify the debris screen around the pulleys. when I did mine i kind of snipped way  the center , till I had clearance , but it was kind of floppy.

 

Thanks Ken in Mi

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1 hour ago, maxwood said:

i kind of snipped away  the center

I'll do the same.  Just measure the pulley and snip a hole large enough to fit over it.

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maxwood

Posted (edited)

 Hello, I had thought of trying to make a metal ring to reinforce the plastic & add a screen to keep the grass out .

but I never did .

 

Make sure you don't over fill the oil, or it will smoke like crazy like a fogger  the engine is sensitive to overfilling.

It does have a low oil shutdown .

 

Thanks Ken in Mi

Edited by maxwood
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On ‎2‎/‎10‎/‎2019 at 5:29 PM, maxwood said:

add a screen to keep the grass out

Good idea.  I'll hold it in with zip ties.

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wwbragg

Posted (edited)

Here is the rear PTO yoke from my Powermax (PN 175229).  When I removed it, the bushings (PN 2177943SM) came out in crumbled pieces.  Partstree wants $12 each and there are 6 of them on the tractor in various places.  Don’t know what they are made of but they measure ½” ID by ¾” OD and 7/8” tall.  Brass seemed TOO hard so I decided to use nylon bushings.  I had a heck of a time finding the 7/8 size but I finally found some at 1”.  I bought 10 for around $15 (PM to me if you need my source). 

One was a little tight so I pressed it in with a 5/16 bolt and washers.  The other one slipped right in.  Then, while in the yoke, I cut off the excess with a hack saw.

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Edited by wwbragg

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wwbragg

Posted (edited)

Not quite done with the mounting plate but here is what I have so far.  I drilled ½” holes to match the original mounting holes in angle iron from an old bed frame.  I then welded the angle iron to opposite sides of a piece of ¼ x 3” flat stock.  Pieces of ¼ x 4” flat stock will go on top of that.  That will give 3 1/4" of lift for the new motor.  Yeah, ok.  The welds are not very pretty, but not all that bad for an old accountant.

I measured (about 10,000 times) the original Onan to locate the drive shaft centerline in relation to the engine mounting holes.  I found that the center of the driveshaft is 6 1/8” from the center of the mounting hole on each side.

Next, I will mark the centerline on the top of the mounting plate and match that to the driveshaft centerline on the New Predator motor, drill the mounting holes and weld the plates onto the side plates described above.

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Edited by wwbragg
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Great work and progress Wendell. Ken’s Sovereign Predator transplant is truly sweet and I’m looking forward to watching your project come together.

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wwbragg

Posted (edited)

I haven't welded the top plates onto to sides yet.  I wanted to check for fit.  WOW ~  That is one tight fit.  I had to replace two of the cute little cap nuts on the bottom of the fan housing with standard nuts.  Then I had to remove the belt guide just to get it in (it can go back in).  The front of the oil pan is right up against the frame and the pullies are still not in alignment.  The only solution I can come up with is to shave some off of the flywheel adaptor.  But then the fan housing will press against the oil cooler.  Perhaps I can replace that arched oil cooler with an oil cooler from an air cooled VW.  Maybe I'll come up with something in my sleep.  

Oh!  I just had an epiphany!  I would still have to shave some off of the back of the adaptor to get the pullies to line up.  But I could shave off the top outer pully and just use one belt.  That would give me more room for the fiber disk and all the spacers and special washers.  On the other hand, when the original Onan was in and the pullies lined up, there was plenty of room for the disk and spacers.  "Help me Obi-Wan.  You are my only hope."

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Edited by wwbragg
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