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Kohler TH18s on 618 Grasshopper

#1

C

Carbur6

Does any one have this engine? Mine needs top end overhauled. I am not sure the number of hours on my engine but it is likely Very High.


CW4 Earnest Eakins

Retired


#2

M

mechanic mark

The Mower Shop, Inc. - Grasshopper Mowers Parts Diagrams, Front Mount 618 Post year, as well as all numbers from engine, thanks.


#3

I

ILENGINE

Carbur6 said:
Does any one have this engine? Mine needs top end overhauled. I am not sure the number of hours on my engine but it is likely Very High.


CW4 Earnest Eakins

Retired
Click to expand...

The TH series engines aka triad engine had a bad habit of pulling the cylinder sleeves out when the engine didn't get proper cooling air flow. I know the oil pump and a few other parts are no longer available. Just replaced one with a command on a walker last summer due to a failed timing belt, and the oil pump gear would turn about 1/4 turn on the shaft from wear.


#4

D

Dieselbob

When I bought my 618 (2004), my dealer had a couple of used units with the TH engine (taken in trade) and he REFUSED to sell them, saying that if he sold me one, I would be uhappy with the mower, with him and with Grasshopper, and it wasn't worth it. I think he was going to re-power them with CH engines. My CH engine is approaching 1200 hours and runs like the day I bought it.


#5

I

ILENGINE

The Kohler OHC engine used was was called lost foam casting technology. the heads, intake manifold, cylinders, and upper crankcase was molded as one piece. The problem with the engine was the cylinders were bored from the bottom of the crankcase and then sleeves where then pressed into the cylinders. Under high heat situations the sleeves would creep downward, where the top ring would then grab the top of the sleeve and then pull it in to the crankcase breaking the rods.


#6

R

relangle

ILENGINE said:
The TH series engines aka triad engine had a bad habit of pulling the cylinder sleeves out when the engine didn't get proper cooling air flow. I know the oil pump and a few other parts are no longer available. Just replaced one with a command on a walker last summer due to a failed timing belt, and the oil pump gear would turn about 1/4 turn on the shaft from wear.
Click to expand...


I have a Grasshopper Model 618 purchased in 2000 and the engine is a Kohler TH18S. I purchased parts for the timing belt. I need help and instructions on how to set the timing on this engine. Can you provide instructions or a link on how to do this?

Thanks


#7

B

bertsmobile1

relangle said:
I have a Grasshopper Model 618 purchased in 2000 and the engine is a Kohler TH18S. I purchased parts for the timing belt. I need help and instructions on how to set the timing on this engine. Can you provide instructions or a link on how to do this?

Thanks
Click to expand...

Same answer as given on your original post
Believe it or not Kohler have all of their repair manuals on their web page as a free download.
It is a bit klunky to navigate around so some prefer to use this site https://www.mymowerparts.com/pdf/Kohler-Service-and-Repair-Manuals/


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