[biker3777]

Now would be a good time to replace the seal,on the output shaft in the pump

 

[biker3777]

Are you talking about seal part number M85508 located on the front of the charge pump or seal AT12820 on the tail shaft?

https://partscatalog.deere.com/jdrc/sidebyside/equipment/82557/referrer/navigation/pgId/20377682

Front of the pump,it WILLfail

 

[biker3777]

A bearing place can get it for you,

 

[biker3777]

Have you checked for fire at the plugs,if so it will run,love these old motors but they do have their issues which most time common and have happened b3fore to others.

 

[biker3777]

Hydraulic oil will start leaking down the front of the differential and it requires removing the driveshaft or pulling the rearend as some have done

 

[biker3777]

Fisheye is probably paint too thick,u using cans or mixing it,do you have your air compressor in the same room,compressors put off an oily substance and will cause that too.

 

[biker3777]

I don’t ever recall that seal leaking,

 

[biker3777]

This engine is simple,you need to get the pto off anyway and assure it is free on the crank and inspect the coil for damage and while your there,replace the seal in the rear bearing plate, and new gasket,pay attention to the gasket,it will go two ways but one will block the oil hole AND the 2 bottom bolts go directly into the oil galley,sealant can be used on these to assure no oil leakage.
The pto is actually on the rear of the engine and the flywheel is on the front.

 

[biker3777]

So on a 318 the pto is mounted on the front of engine and flywheel is mounted on the rear. This is how all technical reports were written on Deere equipment.
Your right on the orientation but the ONAN engine it’s self is setting backwards,if you look up the seal for the bearing plate you will see it’s says the REAR bearing plate.

 

[biker3777]

The 3 bolts need to be removed ( I’ve removed a bunch of them but once I forgot and used a puller and ruined the clutch) other than that and the bolt removed it should come off.
The flex is the 6 flat pieces in front.

 

[biker3777]

That will do it

 

[biker3777]

What I try to do is not remove the three nuts on the pulley/flex plate and remove the clutch as a complete unit including the coil. The rusty ones can be a challenge.

It won’t come off with the nuts on

 

[biker3777]

I realized you were referring to the crank Pulley on the PTO, not the crank gear. Sorry about the confusion, I'll go back to just listening.

Yeah the pto is the discussion

 

[biker3777]

IF ( big if) you pull the field winding coil off,
When you put it back on,put the 4 bolts in finger loose,wrap 3 rounds of masking tape around the outside of the coil,slip the rotor over the coil,tighten the four bolts,pull the rotor off,remove the tape from the coil,now you have a good equal gap between the coil and the hub,
If the coil is put on solid and the rotor is put on and the gap is too small it will foul out between the 2 and ruin the coil.

 

[biker3777]

NO,
Here’s what I do to the muffler,I cut the bottom out of the 2 holes and use Allen bolts and then all that is required is to loosen the bolts and slide the muffler out next time,adjusting the valves requires the muffler come off to get the headers off but some remove the header

 

[biker3777]

All is not lost,
The rotor is rough but maybe it will clean up,all it does is move forward and aft the .018 gap.
The coil is classic miss aligned with a guess as to where it fits,
What I would do is,check the coil to see if it’s shorted,if not,kinda clean it up and get some epoxy and fill the gap,
It does not appear to have wires sticking out iPod the damaged area.
The only reason it did that is heat generated from the bad fit so if fitted proper that won’t happen again.

 

[biker3777]

Actually that motor looks pretty clean.does the coil have 1 or 2 wires.
Put 12 volts to the coil and lay a box end wrench over it and if it sticks the coil is good
You might check the bearing in the pulley for smoothness and replace if rough feeling ,
When you put it back together,the keyin the key way will only stick bout 1/4 inch,just enough to fit in the slot in the rotor.

 

[biker3777]

That area in the rotor isn’t a working area,I think what your seeing is remnants of the epoxy,put some heat on it with a propane torch and see if it melts,otherwise just sand it smooth.
There’s nothing inside there that can cause metal damage.

 

[biker3777]

It looks like it’s been welded on and that might be what pulled the epoxy out

 

[biker3777]

I see what happened to that rotor,they welded up the slots i it,this is on ebay