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Go Back   Only Cub Cadets > Cub Cadets > CCC/MTD Cub Cadet built Tractors (GT)
Reload this Page CH18S down on power , knocking ? Next steps
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  #1  
Old 07-07-2020, 04:08 PM
pcampbell pcampbell is offline
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Default CH18S down on power , knocking ? Next steps
My CH18s in my 2518 had a sudden loss of power combined with some pretty nasty clanky knocking sounds. I suspect rod knock but not sure yet. Need some help for next steps. I will do a compression test on both cylinders. I am not sure if I know how to do a leakdown test on this motor, yet. What else? What should I be thinking for rebuild, or replacement?

Can I buy a new drop in motor . I see a couple on Northern Tool that look pretty familiar.

Example:
https://www.northerntool.com/shop/to...2772_200632772

What else should I be considering?
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  #2  
Old 07-07-2020, 04:30 PM
R Bedell R Bedell is offline
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Quote:
Can I buy a new drop in motor
Since there are hundreds of variations of the CH18S, the one that would be the "drop in" replacement would be.... CH18S-62588 Kohler Engine
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  #3  
Old 07-07-2020, 04:39 PM
pcampbell pcampbell is offline
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Both cylinders giving me 150psi.

Here is a video , sound is not great

https://www.youtube.com/watch?v=ZK4y70AH7xw

Some more info on my exact model, not sure if these are exactly correct.

https://sleequipment.com/kohler-18-h...h18-62588.html
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Carlisle All Trail's 23x10.5 & Firestone 3 rib front
70# weights per wheel
160# suitcase weights in rear
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  #4  
Old 07-07-2020, 05:06 PM
Mike McKown Mike McKown is offline
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Check your rocker arm action. Sounds like one may not be going full stroke?
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  #5  
Old 07-07-2020, 05:41 PM
pcampbell pcampbell is offline
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Originally Posted by Mike McKown View Post
Check your rocker arm action. Sounds like one may not be going full stroke?
Wow! Great ear! I owe you a beer!

One of the "driver" side (left) rocker arms is knocked out of place.

https://www.flickr.com/photos/187179.../shares/V6W4w2



Do I just stick it back in the correct spot and re-torque (ft lb?) or is there any sort of adjustment or lash I need to take into consideration?
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2004 CC 2518 48" deck
Johnny Jr plow/bucket
Carlisle All Trail's 23x10.5 & Firestone 3 rib front
70# weights per wheel
160# suitcase weights in rear
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Old 07-07-2020, 06:02 PM
Mike McKown Mike McKown is offline
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Originally Posted by pcampbell View Post

Do I just stick it back in the correct spot and re-torque (ft lb?) or is there any sort of adjustment or lash I need to take into consideration?
If it was mine, I'd check the push rod and make sure it was still straight. If so, I'd stick it back in and run it with the valve cover off and watch the action.

You may also have a stuck valve which would let the pushrod jump out of place.

You have hydraulic lifters and the adjustment procedure is in the manual.

If the push rod is bent, you may have more serious problems.
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  #7  
Old 07-07-2020, 07:05 PM
pcampbell pcampbell is offline
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Thanks ,pushrod looked straight to me. My guess is that the rocker pivot bolt just backed out. Everything seems pretty good right now. Thanks a lot for your help!
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Johnny Jr plow/bucket
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70# weights per wheel
160# suitcase weights in rear
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  #8  
Old 07-07-2020, 11:56 PM
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guyina4x4 guyina4x4 is offline
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you could have a valve seat floating around
I had one do the same thing
put it back on and ran ok for a week or so
then same problem
pulled head and found valve seat was out of head

there is no lash adjustment on the command engine, they have hydraulic lifters. just run the bolt down all the way and snug it up good. I'm sure there is a torqe spec but I don't know it.

spec is Rocker Arm Screw 18.1 N·m (160 in. lb.)
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Old 07-08-2020, 06:40 AM
dale c. dale c. is offline
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sometimes the threads will pull out of the head and let the bolt come loose. if the threads are stripped you'll need a helicoil to fix the threads
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Old 07-08-2020, 10:45 AM
bugeye bugeye is offline
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That picture looked just like one of my engines. I rolled the pushrod on glass. It seemed straight. Put it together and has run for a few years without incident. Hopefully you have similar good fortune
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