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rpickle

Dirty ch18s

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rpickle
Taking the tin off of this has exposed a ton of crap that was lodged up in there! Poor thing. Hope it didn't do any damage. Valve covers leak, so took one off to look at it. There is a paper gasket and remnants of silicone or an o-ring, not sure. Looked up the engine on Kohlers engine site and it doesn't show a paper gasket? Engine number is: Model ch18s Spec 62513 Serial 2301212587 [IMG]http://i11.photobucket.com/albums/a199/rpickle/005-5.jpg[/IMG] Also, the other valve cover has 2 hose nipples (crankcase breather) that have nothing attached. The breather nipple coming up out of the intake manifold has a hose hooked to it that runs into the air cleaner assembly. So, is that correct? Should the valve cover nipples be capped? Thanks in advance.

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1Litre
The ports on the valve cover are for pulse fuel pump. The intake manifold port should not go to the air filter , that is causing a big vacuum leak and should be capped. The crankcase breather tube should be routed to the air filter base.

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RayS
There is only suppose to be a o-ring for a gasket. That is what both mine have and the parts manual does not show a fiber gasket. Atleast for mine it doesn`t. Below is ther parts manual. http://www.ereplacementparts.com/kohler-ch1862513-engine-parts-c-106503_108123_109923.html

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CarlH
The early Command's had paper/fiber gaskets. Later Command's used a different valve cover with a groove for the O-ring and different screws. I think all the Command's used in Sovereign's and Sunstar's used the O-ring but I'm not certain. You can check it out on the Kohler website with your spec #.

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leeave96
I just replaced the valve covers on my CH18S on my Agco Allis 918H (aka: Simplicity Sovereign). A previous bonehead owner drilled holes, threaded in a brass hose fitting and vented the valve covers to the bottom of the tractor. The new valve covers had a grove in them for a rectangular in cross-section o-ring. You can buy just the o-ring. The vacuum line for my fuel pump comes from the engine block - not from the valve covers, however, I have seen a newer Kohler Command that used the valve cover and a port off it to drive the fuel pump. The breather hose attaches to the bottom of the air cleaner. Good luck, Bill

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rpickle
Thanks. My vacuum lies are correct then. For the valve cover gasket though, I made a set with gasket material I had laying around. If that doesn't work, I will look into the o-ring. Both sides had the gasket. Pics are below. [IMG]http://i11.photobucket.com/albums/a199/rpickle/019-4.jpg[/IMG] [IMG]http://i11.photobucket.com/albums/a199/rpickle/020-4.jpg[/IMG] [IMG]http://i11.photobucket.com/albums/a199/rpickle/023-4.jpg[/IMG]

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DanD
quote:
Originally posted by leeave96
however, I have seen a newer Kohler Command that used the valve cover and a port off it to drive the fuel pump.
I bought a new Command CH18 for my Sovereign from Al Eden with a build date of August 2011. The fuel pump is driven off a port on the block, not from the valve cover.

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leeave96
quote:
Originally posted by DanD
quote:
Originally posted by leeave96
however, I have seen a newer Kohler Command that used the valve cover and a port off it to drive the fuel pump.
I bought a new Command CH18 for my Sovereign from Al Eden with a build date of August 2011. The fuel pump is driven off a port on the block, not from the valve cover.
That's how my Command's fuel pump is driven - port on the block. The tractor I saw the valve cover driven pump was on a 2010 Cub Cadet 2554. I think there are several configurations of valve covers for these engines. Bill

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rpickle
Well, while reading thru the maint manual, page 86 mentions there were 3 valve cover designs, one that uses a gasket and RTV, one that uses a black o-ring and the latest is a brown or orange o-ring. Torque is different per each type with my style needing 30 in pounds. Hope my fingers were calibrated correctly!

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