monster318
Silver Member
Hello,
I have acquired a mid 90s Scag Super Z from a co-worker off a barter trade, at the time all he told me was it had internal engine problems and dealer told it him it would be around $800 to fix. I got it, brought it home, put fresh gas, oil, a battery and new spark plugs in it, and it fired right up. I mowed about 4 times before checking oil again and it was empty! none on the dip stick...refilled it and mowed several more times over the period of two months with it, ran out of oil again. It all of a sudden started misfiring on one cylinder. I pulled the plugs back out and Cylinder #1 was severely oil fouled. Ok now I have an explanation as to where all this oil was going. After some internet research I read a few forums of guys with these motors saying the valve guides like to crack and allow it it burn oil. I ripped the motor out of it, pulled cylinder head off and found no valve seal on exhaust cylinder and a lot of discoloring around that valve internally around the valve spring, almost like it was having blow through when the exhaust valve opened. Now from any and all knowledge I have ever had about motors, all motors had valve stem seals on both valves intake and exhaust..So immediately I think I found my problem. I order a Valve train kit, and valve stem seal kit from Kohler (which by the way came with two valve stem seals, so I put one on each valve). Was putting it back together tonight and had just finished up cylinder one side and decided to pull cylinder two valve cover off, and low and behold, no valve stem seal on that exhaust valve either and had same discoloring around valve spring.
So now I am really stumped and I turned to my Kohler Service Manual, It says directly in the service book that only Intake valves should have seals on them. So whats sealing the exhaust valve from having oil run down into the combustion chamber? This is also making me wonder if this is the real problem why I am burning oil.
its a Kohler Command 22HP Model CV22S-67509
I have acquired a mid 90s Scag Super Z from a co-worker off a barter trade, at the time all he told me was it had internal engine problems and dealer told it him it would be around $800 to fix. I got it, brought it home, put fresh gas, oil, a battery and new spark plugs in it, and it fired right up. I mowed about 4 times before checking oil again and it was empty! none on the dip stick...refilled it and mowed several more times over the period of two months with it, ran out of oil again. It all of a sudden started misfiring on one cylinder. I pulled the plugs back out and Cylinder #1 was severely oil fouled. Ok now I have an explanation as to where all this oil was going. After some internet research I read a few forums of guys with these motors saying the valve guides like to crack and allow it it burn oil. I ripped the motor out of it, pulled cylinder head off and found no valve seal on exhaust cylinder and a lot of discoloring around that valve internally around the valve spring, almost like it was having blow through when the exhaust valve opened. Now from any and all knowledge I have ever had about motors, all motors had valve stem seals on both valves intake and exhaust..So immediately I think I found my problem. I order a Valve train kit, and valve stem seal kit from Kohler (which by the way came with two valve stem seals, so I put one on each valve). Was putting it back together tonight and had just finished up cylinder one side and decided to pull cylinder two valve cover off, and low and behold, no valve stem seal on that exhaust valve either and had same discoloring around valve spring.
So now I am really stumped and I turned to my Kohler Service Manual, It says directly in the service book that only Intake valves should have seals on them. So whats sealing the exhaust valve from having oil run down into the combustion chamber? This is also making me wonder if this is the real problem why I am burning oil.
its a Kohler Command 22HP Model CV22S-67509