[AT] Subject: Re: 16 HP Onan twin

[Spencer Yost]


Adding this to my list of “Problems I’ve never had and hope I don’t”.

Using a punch to try to peen/pinch it to hold does seem like a reasonable solution to me though.   Bill’s experience suggests that it’s only a near to mid term solution, but as Phil indicates maybe long enough to find a replacement; all the while saving a little money? 

Some of those valve seat inserts are pretty brittle tho so should probably be kinda careful.

Spencer 

Sent from my iPhone

>> On Jul 19, 2020, at 6:11 PM, Andy Glines <andyglines at hotmail.com> wrote:
> 
> 
> Message: 12
> Date: Sun, 19 Jul 2020 14:43:21 -0500
> From: Phil Auten <pga2 at basicisp.net>
> To: at at lists.antique-tractor.com
> Subject: Re: [AT] 16 HP Onan twin
> Message-ID: <fe56d210-ae9b-625c-0dbf-a628984ea7b2 at basicisp.net>
> Content-Type: text/plain; charset="windows-1252"; Format="flowed"
> 
> Andy, could you stake the seat into the block? I don't know much abvout 
> Onan engines, but it swwms to me that this would be an inexpensive fix 
> vs. a replacement engine. Also if these Onan engines are prone to this 
> failure, there is probably a fix available for the issue.
> 
> 
> My 2?
> 
> Phil in TX
> 
> 
> On 7/19/2020 2:27 PM, Andy Glines wrote:
> > My Gravely 816 tractor has an Onan 2 cylinder engine (B43M-GA 016).? 
> > One of the exhaust valve seats is loose in the block causing that 
> > cylinder to have no compression.? It may be easier to use a different 
> > engine than to fix this one.? There are other engines available in the 
> > local ads.? Or course they are different model numbers even though 
> > they look the same as mine. Is there a good resource for me to 
> > determine the difference between them?
> 
> 
> Thank for the answer Phil, the trick fixes like staking the seat into the block have already been tried and failed.  There are oversized seats available but I would have to tear the engine down to have the block machined for the new seat.  I may be able to switch engines easier and cheaper.  I wish I knew and easy way to machine the block for a new seat without a complete tear down.  
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