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BBELL94

New to me 520-8

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BBELL94

Just picked up a non running 520-8. Has 588 hours on it. Paid $500 for it. Previous owner took the flywheel off trying to diagnose a no spark issue. Did I do alright on this deal and how big of a project is it to put the flywheel back on? Looking forward to getting this beast of a tractor running.

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Sparky

  Can’t say if it’s a good deal or not since it’s a non-runner. 
  If you get spark back and it runs good then yes. If you dump hundreds into getting spark back and it runs crappy, smokes, knocks or even worse.. only runs on one cylinder it was a lousy deal. 
  Any attachments?? 

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BBELL94
34 minutes ago, Sparky said:

  Can’t say if it’s a good deal or not since it’s a non-runner. 
  If you get spark back and it runs good then yes. If you dump hundreds into getting spark back and it runs crappy, smokes, knocks or even worse.. only runs on one cylinder it was a lousy deal. 
  Any attachments?? 

It came with a very nice 48" deck.

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lynnmor

The flywheel is easy to put on, one bolt in the center torqued to 55 lb. ft.  The blower tin is a bit of a pain.  Before torquing it back up, test the ignition module using the Onan Service Manual available in the manuals section.

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BBELL94
1 hour ago, lynnmor said:

The flywheel is easy to put on, one bolt in the center torqued to 55 lb. ft.  The blower tin is a bit of a pain.  Before torquing it back up, test the ignition module using the Onan Service Manual available in the manuals section.

I seen some timing marks on the block, do I have to time the flywheel somehow or perhaps maybe its keyed?

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WHX??

It's keyed ... down load the manual and study it ...  it will tell you how to trouble shoot the no spark. There are also narks on the shroud that indicate firing points. 

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kpinnc

If you can check compression on both cylinders, and they're within limits of the manual- you can relax a little.

 

Always been a rule of thumb for me. If it has compression, I can get it to run... :thumbs:

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Ed Kennell
9 hours ago, kpinnc said:

If it has compression, I can get it to run... :thumbs:

 

Yep, just add fuel and fire.

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Pullstart

They sure are beasts!  Hopefully you can get it up and running in no time:handgestures-thumbupright:

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cafoose

Since you have no spark, before you put the flywheel on, make absolutely sure the module is working properly. If not, you will be removing it again and it's a PIA to put all the shrouds on :handgestures-thumbupright:

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JoeM

If you find out that the Ignition Module is bad best to be patient and shop around. some go north of $100. Sometimes flea bay has some finds. 

Cummins owns Onan and they are very proud of their parts. 

image.png.76427902f64d838e3afa6737f59586b9.png

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lynnmor
11 hours ago, BBELL94 said:

I seen some timing marks on the block, do I have to time the flywheel somehow or perhaps maybe its keyed?

There is a key, be sure to put it in correctly so the tail of it engages the trigger ring.

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BBELL94

Thank you all for all the advice!!

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BBELL94
On 10/11/2022 at 8:51 AM, JoeM said:

If you find out that the Ignition Module is bad best to be patient and shop around. some go north of $100. Sometimes flea bay has some finds. 

Cummins owns Onan and they are very proud of their parts. 

image.png.76427902f64d838e3afa6737f59586b9.png

How do you go about testing the ignition module? Is it in the manual?

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gwest_ca

 

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JoeM

Might try this, I also have put a ohm meter on the unhooked module wires and should get .4 to 2 ohms reading. 

 

 

 

 

 

image.png.77d8d1087e710c33db41843826e79c8b.png

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