onan 12.5 damaged after shutdown?

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  #1  
Old 06-11-07, 07:37 PM
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onan 12.5 damaged after shutdown?

Hi, from new member!

I'm retired & my son gave me a used Toro-212-H riding mower Model: 05-38SL02 Ser: 2002325

It has what I think is an Onan engine but can't determine model. The cover says

E124V-N/10964B
Ser: J19352867
Part: 116799

I shut it down and it wouldn't restart. Intake valve
is seized, pushrod is bent about 20 degrees.

Which is the chicken and which is the egg?
I presume the seized valve would bend the
pushrod.

How to unseize the valve (or guide) and can I
just straighten the pushrod?

This engine no longer exists so, worst case scenario, what repowering options avail?

Thanks a meg.
 
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  #2  
Old 06-12-07, 01:13 AM
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I don't see any direct replacement engines being made at this time, but the crankshaft size and bolt pattern is probably standard since those mowers apparently were also made with a 10hp briggs and stratton on them too. It might take a little modification of the throttle, wiring, exhaust, and/or other small things, but I would think you could put a single cylinder briggs on it easily enough.

The valve probably siezed first, causing the pushrod to bend. I'd pull the head and see what you can do. An automotive machine shop might be able to repair it for you.
 
  #3  
Old 06-12-07, 07:35 PM
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I hope this will end up as a reply to cheese as
intended, the interface ain't like my Thunderbird
newsreader :-)

Thanks for the info. I pulled the head, hammered
the rod to "field straight", the valve loose, and put
it all back together with the old gaskets.

In the process I noticed no ridge in the cylinder
so either it's a low time engine or a rebuild. I'll
try to find a free overhaul manual and maybe fix
it right with a new pushrod and gaskets next time.

BTW the intake valve passage and valve were
loaded with thick muck like half-cured gasket
glue. Never seen nothing like it.
 
  #4  
Old 06-12-07, 11:34 PM
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So it's back up and running? That's good news. There should still be parts available for that engine. Who knows what the gunk is. Maybe glue is what it is.
 
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