520H seized

[Handy Don 13,359]

Or is it the one under the coil mount bracket? Be very careful NOT to drop that one when removing it (yep, experience).

Edited February 17, 2022 by Handy Don

[RED-Z06 2,480]

[RED-Z06 2,480]

Theres 2 side panel screws, then 1 side panel screw, 2 lower screws, 2 screws under the coil...and one on the coil mount, one next to the governor on top then the one i circled behind the panel...then it kinda...twists up and off to clear the flywheel 

[petermil12833 16]

Thanks for the very explicit guidance -- but I'm still flustered. I'm not sure what I'm seeing in your photo, because it doesn't seem to look like what I see. I just spent another 40 minutes looking for that last screw, and I'm just not finding it. I have all the screws out except that last one. My wiring makes pictures difficult, but here are two pics of what I see. The entire front of the shroud is loose and can be pulled out an inch or so, but it's pivoting on something at the back that I can't see.

There's one pic from the flywheel side and another from the muffler side. I'm done for today.

[RED-Z06 2,480]

You have to pull it out, tilt the bottom out, and kinda...rotate the shroud free...it goes down behind the flywheel area,  doesn't pull straight off.

[lynnmor 7,585]

11 minutes ago, petermil12833 said:

 

See that yellow wire in the left side of your photo?

 

Your ignition coil is down there and it needs to come out.  With that out of the way, you will see the source of your frustration.

[petermil12833 16]

I did take the coil bolts out, so I can move it around. I still don't see any screws coming from the opposite side. (Hmmm -- maybe this calls for my sawzall. lol)

Tomorrow is supposed to be "warm" again, so I'll see if I can move all those wires away. Thanks again.

[Handy Don 13,359]

57 minutes ago, petermil12833 said:

I did take the coil bolts out, so I can move it around. I still don't see any screws coming from the opposite side. (Hmmm -- maybe this calls for my sawzall. lol)

Tomorrow is supposed to be "warm" again, so I'll see if I can move all those wires away. Thanks again.

I wish you smooth pulling tomorrow. I'll admit my first Onan shroud removal was a trying event. 

[lynnmor 7,585]

1 hour ago, petermil12833 said:

I did take the coil bolts out, so I can move it around. I still don't see any screws coming from the opposite side. (Hmmm -- maybe this calls for my sawzall. lol)

Tomorrow is supposed to be "warm" again, so I'll see if I can move all those wires away. Thanks again.

 

I think that I see the coil still in there, show the coil laying on the bench and the wires out of the way.

[Cee245 823]

@petermil12833

See if this helps. The big shroud on the 16/20 hp Onan's are the same.

 

I'm pointing to the little bolt i think you are missing. It is approx 6" towards the middle of the motor from the end of my finger. Its a 3/8 bolt head and it holds a little bracket that is ATTACHED to the big shroud. That bracket holds the coil. As @lynnmorsays, remove the coil (2 -- 3/8 bolts) and its easier to get to.  This particular bolt is in the VERTICAL position.

 

The pic above with the red circle is confusing me as its indicating a horizontal positioned bolt. 

.

 

Hope this helps

 

Edited February 18, 2022 by Cee245
Add pic

[petermil12833 16]

Many thanks to everyone!! Yes, the coil is still in position but unbolted so I could move it and look around. Guess I should remove it along with all the wiring that makes it so hard to work in there. I'll continue this odyssey tomorrow and hopefully get that #$%^&*(*&^%$ shroud off. Then, we're back to winter weather here.

[lynnmor 7,585]

Did you follow this thread?  It's all right in there.

[petermil12833 16]

OMG! What a great video! You're right, it's all there.  Unfortunately, it's too cold and blustery again to work in the barn, but next warm day ... I will prevail! Thanks.

[petermil12833 16]

We had a warm day today (high 40s) so I resumed my attack of the flywheel shroud. Yes, the remaining bolt WAS hidden by the coil, and with lots of yanking and cussing, I was able to remove the  shroud. I made myself a promise -- when I reassemble this beast, I will NOT put that bolt back in. Now, to get that flywheel off ... tomorrow?

 

Also met with the owner/mechanic at a local small engine shop, and he agreed that if it becomes too much for me, he'll finish the job. He said he might need my help sourcing parts, which could save some $$$. Have I mentioned that I am too old for this kind of project? Well it's true.

 

To be continued . . . .

[lynnmor 7,585]

You can get the shroud off without extreme yanking, it just takes the correct motion and some choice four letter words.

 

Don’t get too flustered when pulling the flywheel, with a four bolt puller and some care it will come right off.  Get rough and you can cause damage.

[petermil12833 16]

After another snowblowing event  (my other tractor), we've had some marginally warmer days. With the help of those 4-letter words, I got the shroud off. And after two days of persuasion, I removed the flywheel today. i haven't found any (easy) external reasons for the engine's seizure, and I'm deciding that it's time to turn the project over to the local engine shop. It's still too cold, and I'm still too old (that ain't gonna get any better - lol). As I mentioned in the first post, I suspect the oil pump, because the oil pressure light flickered seconds before shutdown. When I get a diagnosis, I'll post again to close the loop. Thanks for all your help!!

[oliver2-44 10,380]

Wishing you best of luck on the repair

[RonnieB2nd 33]

On 2/14/2022 at 2:46 PM, petermil12833 said:

Well here goes my lament. My Onan P220G has seized without warning. No big noise. 600 hrs. Plenty of  new oil. 30 seconds before it died, the oil pressure light flickered on and off. Then it just stopped abruptly and won’t turn. I can’t try to tear it down until my barn warms up in the spring, but I’d appreciate any thoughts about what to look for first.

 

 

I thought I was well prepared for winter in the northeast (see pic). I still have my 314H that has served me so well for 25 years. I had completely rebuilt the snowblower attachment – new bearings, chain, paint, and even a transplanted auger from an older blower. Plus, I now had the 520H that I had acquired over the summer. After a good cleaning, a new fuel pump and voltage regulator, new oil and filters in engine and transmission, it has been running perfectly – sounding happy. Til about Feb. 1.

 

 

There was no knocking or pounding and it didn’t sound like something wanted to escape from inside. But it sure did stop – fast. The only clue was that oil pressure light, but these lights have been unreliable and I intended to troubleshoot all of them in the spring. Too late.

 

 

Any suggestions about where to look first? Thanks very much!

Peter

 

 

 

I was taught a 60" deck is too much for the 520H and can cause over heating issues 

[oliver2-44 10,380]

4 minutes ago, RonnieB2nd said:

I was taught a 60" deck is too much for the 520H and can cause over heating issues 

But didn’t Wheelhorse put the swept axle on the 520 specifically to make room for the 60” deck

[RED-Z06 2,480]

26 minutes ago, RonnieB2nd said:

I was taught a 60" deck is too much for the 520H and can cause over heating issues 

Nah, p220 handles a 60 fine

[lynnmor 7,585]

1 hour ago, RonnieB2nd said:

I was taught a 60" deck is too much for the 520H and can cause over heating issues 

 

I have used a 60" for many years without issue.  With the larger cutting chamber, grass exits readily and I see only a little increase in power required versus a 48",  The deck is very heavy and wears the hitch faster and stresses the entire chassis more.  Level the deck properly, service the wheel bearings, lube any and all parts of the lift mechanisms then enjoy the faster cut.

[c-series don 9,456]

I’ve been running a 60” deck on my 416-H for years. It has 6” front wheels and no forward swept front axle. I can turn about 95% before the wheels rub, I have a fairly open property so it’s really not a problem.I’ve never had an issue with it running hot or bogging down, that 16hp handles it just fine. I will say that I mow about once a week so I’m not trying to cut tall grass, that I’m sure would be an issue. 

[RonnieB2nd 33]

I'm Glad that's not the gospel. Whew

[petermil12833 16]

We had a 1-day warm spell on Sunday so I spent a couple more hours on the Onan P220G. Got the flywheel off and removed the timing cover. That's when I discovered that the seizure was not trivial. There's (big) debris in the oil sump; I could move it around with a screwdrriver, and you can see it in this pic -- illuminated by the flash. Probably the bottom end of a connecting rod.

 

That forces a big decision: at this age (79) I'm not willing to do a rebuild myself, so I'll be negotiating with a local engine shop and exploring other options. In the meantime, my 314H continues its snowblowing duties, as needed.

 

THANKS for all the help here! Wish me luck.

[RED-Z06 2,480]

2 minutes ago, petermil12833 said:

We had a 1-day warm spell on Sunday so I spent a couple more hours on the Onan P220G. Got the flywheel off and removed the timing cover. That's when I discovered that the seizure was not trivial. There's (big) debris in the oil sump; I could move it around with a screwdrriver, and you can see it in this pic -- illuminated by the flash. Probably the bottom end of a connecting rod.

 

That forces a big decision: at this age (79) I'm not willing to do a rebuild myself, so I'll be negotiating with a local engine shop and exploring other options. In the meantime, my 314H continues its snowblowing duties, as needed.

 

THANKS for all the help here! Wish me luck.

Have them do the isavetractors.com steel governor spacer swap while they are there..will save the engine from another possible failure