Hello
I have a Kohler CH 16 S in a cub cadet.It's actually my 97 year old parents' tractor. It wouldn't start so I tore it apart and found a blob of stuff burnt on the exhaust valve. I scraped the burnt stuff off the valve and used a piece of emery cloth to clean up the valve and seat. Everything in the engine looks really good... especially for it's age no scarring in the cylinder no nothing ...looks really good.
In the manual , it describes a leak down test, which is how I came upon the valve in the first place. When I was putting the tractor back together, it did not seem that the valves were sealing due to the rocker arm holding them down so I put washers under them until the valve closed. Upon running it, it seemed to run well, but after about an hour started smoking like crazy. I tore it apart again, and there was oil everywhere in the engine... I believe it came thru the carburetor from the breather.
I replaced rings, valve oil seals, and head gasket and am putting it together again.
I removed the washers I put in under the rocker arms in the first place, but here is my question: I understand that the hydraulic lifters must be empty of oil... how do I make sure that is occurring and how do the valves close when the rocker arms seem to not have any clearance and hold them open?
I'm thinking ( hoping ) that the washers I put under the rockers, or the rings were the culprit in the excess oil everywhere, but I don't see how the leakdown test would work, or how the valves would seal with the rocker arms being tight. Seems like there should be some clearance between the rocker arms and the valves... Shimming the rocker arms seemed to me to be a good idea, allowing the valves to close for sure because the rocker arms were about a half a red hair loose on the valves
Could someone please advise me on this ?
Thank you .
I have a Kohler CH 16 S in a cub cadet.It's actually my 97 year old parents' tractor. It wouldn't start so I tore it apart and found a blob of stuff burnt on the exhaust valve. I scraped the burnt stuff off the valve and used a piece of emery cloth to clean up the valve and seat. Everything in the engine looks really good... especially for it's age no scarring in the cylinder no nothing ...looks really good.
In the manual , it describes a leak down test, which is how I came upon the valve in the first place. When I was putting the tractor back together, it did not seem that the valves were sealing due to the rocker arm holding them down so I put washers under them until the valve closed. Upon running it, it seemed to run well, but after about an hour started smoking like crazy. I tore it apart again, and there was oil everywhere in the engine... I believe it came thru the carburetor from the breather.
I replaced rings, valve oil seals, and head gasket and am putting it together again.
I removed the washers I put in under the rocker arms in the first place, but here is my question: I understand that the hydraulic lifters must be empty of oil... how do I make sure that is occurring and how do the valves close when the rocker arms seem to not have any clearance and hold them open?
I'm thinking ( hoping ) that the washers I put under the rockers, or the rings were the culprit in the excess oil everywhere, but I don't see how the leakdown test would work, or how the valves would seal with the rocker arms being tight. Seems like there should be some clearance between the rocker arms and the valves... Shimming the rocker arms seemed to me to be a good idea, allowing the valves to close for sure because the rocker arms were about a half a red hair loose on the valves
Could someone please advise me on this ?
Thank you .