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  #11  
Old 09-06-2012, 08:39 PM
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piston slapper piston slapper is offline
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Gene...by the time you get this motor running right...you'll be ready to take the Kohler technicians test...
Be very careful when shopping for a used Command twin head...
22- 23 heads WON'T work on a 25...
The oil drain is different on horz and vert heads...WON'T interchange..
Oil drain is on the exhaust side on vert heads...intake side on horz..
If you buy a resurfaced head..be careful...if the head is shaved too much the pushrods will hold the valves open...the minimum distance between the head mounting surface and the flat between the valves on 25hp heads is .220...on 18 to 23 hp heads is .236...you would need a machinists pin gauge to find these measurements....these numbers are not in any book...they are the result of many years of debugging these engines...
The only cure for over shaved heads is to shim the rocker studs...
Hope this helps...Slapper
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  #12  
Old 09-06-2012, 10:08 PM
mowisme mowisme is online now
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Thanks Piston Slapper..

Thats some great info there..Thanks much!..I'll try to find a un-molested head off a cv25. as far as ever being a kohler tec..My wife who knows me pretty good would have a good laugh on that one. I've worked on motors on/off all my life (59)- but very few ever ran again. Gene
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  #13  
Old 09-06-2012, 10:21 PM
RyanDamo RyanDamo is offline
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i just put heads from a vertical shaft 22 hp mower engne on my 25 hp leaf vac this week and they worked. not sure if the years are different but i took the risk buying them and it turned out good
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  #14  
Old 09-07-2012, 08:05 AM
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piston slapper piston slapper is offline
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Quote:
Originally Posted by RyanDamo View Post
i just put heads from a vertical shaft 22 hp mower engne on my 25 hp leaf vac this week and they worked. not sure if the years are different but i took the risk buying them and it turned out good
Hmmmm...Ignorance will take you a long way in this world
When you get tired of blowing head gaskets...get the right heads...
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  #15  
Old 09-07-2012, 10:17 AM
mowisme mowisme is online now
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thinking on new..

I am not having much luck finding a cv730/cv25 (25hp) head at all 'used'. I did find a factory new one for 117+shpg which seems cheapest I found on net. I will keep looking for a week..then I think I'll just order the new one. (P.N. 24-318-116s)..is thier anything I need to do with the new head besides getting my valves ground to the head and putting on new valve seal? ..P.S. any of you guys got one to sell?
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  #16  
Old 09-07-2012, 12:14 PM
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Restrorob Restrorob is offline
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Gene,

Check your private messages........This is a copy of the one I sent you yesterday evening;


Quote:
I've got two blown 25's (bottom end) at the shop, If you want I'll see about locating a complete head tomorrow and ship it to you ?
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You never learn anything until you admit you don't know it all...

"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!
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  #17  
Old 09-07-2012, 12:57 PM
mowisme mowisme is online now
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Thank you RestoRob!..

I replyed IM just now. I definately would. Just let me know- Thanks again!..You and PS have been tremendous help. You Guys are what makes this place so valuable. Especually to guys like me who have to think a minute which way the nut goes to put on or take it off. Gene
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  #18  
Old 09-07-2012, 02:48 PM
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piston slapper piston slapper is offline
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Quote:
Originally Posted by piston slapper View Post
Gene...by the time you get this motor running right...you'll be ready to take the Kohler technicians test...
Be very careful when shopping for a used Command twin head...
22- 23 heads WON'T work on a 25...
The oil drain is different on horz and vert heads...WON'T interchange..
Oil drain is on the exhaust side on vert heads...intake side on horz..
If you buy a resurfaced head..be careful...if the head is shaved too much the pushrods will hold the valves open...the minimum distance between the head mounting surface and the flat between the valves on 25hp heads is .220...on 18 to 23 hp heads is .236...you would need a machinists pin gauge to find these measurements....these numbers are not in any book...they are the result of many years of debugging these engines...
The only cure for over shaved heads is to shim the rocker studs...
Hope this helps...Slapper

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Heres a few pics on measuring the depth of the combustion chamber..
Attached Images
   
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  #19  
Old 09-07-2012, 03:43 PM
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piston slapper piston slapper is offline
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BTW...yes..that is a used head..cleaned and resurfaced on a glass sanding block..
I got really upset with a local machine shop a few years back..that butchered a set of heads...even after I gave them the combustion chamber data listed above..
So I made my own glass sanding block and purchased the Neway valve and seat tools for about $1000....best money I ever spent...
Now there is nobody to blame but myself....
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  #20  
Old 09-07-2012, 04:46 PM
mowisme mowisme is online now
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That is awsome set-up Piston Slapper..way over my capabilities. You certainly know what your doing. Thanks- Gene
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