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SgtBob

520 Onan Problems

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SgtBob

Just wondering if the Onan in the 416 has the same valve seat issues as the 520.  I have heard a lot about the 520's but not the 16HP Onan.  I would believe they are the same but would like someone with more knowledge to chime in.

 

Thank you for any insight you can provide.

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littleredrider

I would think so since it’s the same setup...but maybe they don’t produce the heat a 20horse does? 

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BESTDOGEVER

I am pretty sure that they are the same. The problem is that the air flow is bad on that cylinder leading to the failure . There are many posts here about ventilating that belt guard that will help a lot

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SgtBob

Thank you for your time.  That's what I was thinking but wanted another opinion.

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Pollack Pete

Gotta keep oil leaks around the oil filter at bay.The dirt and grass clippings stick to motor oil like a magnet.Also a good compressed air blast behind the cooling tins  after every mow will help keep the crap out of those rear cylinder cooling fins.I've only used a 520H for snow blower duty.Never had any worries about over-heating that big Onan.

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