I have a Honda GCV160, GJAEA-3313087 mounted on a pressure washer. I picked it up in non-running condition with little history about it. When I got it there was an obvious major oil leak coming from the valve cover. This is the first engine like this I have worked on. I was quite surprised to find there was no head gasket and the case splits in an odd diagonal direction. I learned the hard way about keeping the valves in place before you remove the crankshaft. They slipped out and I had quite the time removing the crankshaft.
I removed the valve cover to expose the rockers and the plastic timing gear and timing belt. There was a significant amount of oil in the valve cover, far more than I have seen before and more than I expected to see, but not having worked on this type of engine before I didn't know if that was normal. I removed the valve keepers and springs. I removed the valve stem seal from the intake valve. There was not a stem seal on the exhaust valve. It was obvious that a lot of oil had been passing through the exhaust valve stem opening, there was burnt oil residue build up on the retainer side (valve cover side) of the exhaust valve stem opening.
It doesn't seem right to me that there should be that much oil passing by the piston and being pushed out through the exhaust valve. The burnt oil residue seemed to indicate to me that the oil was being pushed through at extremely high pressure by the piston, causing the oil to burn.
Based on this can anyone identify what the problem might be. Are the piston rings bad and allowing excessive oil to pass? The cylinder looked just fine, no scoring at all. There were no metal shavings or anything out of place in the crankcase. I don't see anything obvious.
If the rings are the culprit and I replace the rings, is it likely that any permanent damage has been done?
Has anyone run into this before? Needing some guidance. Thanks
Rick
I removed the valve cover to expose the rockers and the plastic timing gear and timing belt. There was a significant amount of oil in the valve cover, far more than I have seen before and more than I expected to see, but not having worked on this type of engine before I didn't know if that was normal. I removed the valve keepers and springs. I removed the valve stem seal from the intake valve. There was not a stem seal on the exhaust valve. It was obvious that a lot of oil had been passing through the exhaust valve stem opening, there was burnt oil residue build up on the retainer side (valve cover side) of the exhaust valve stem opening.
It doesn't seem right to me that there should be that much oil passing by the piston and being pushed out through the exhaust valve. The burnt oil residue seemed to indicate to me that the oil was being pushed through at extremely high pressure by the piston, causing the oil to burn.
Based on this can anyone identify what the problem might be. Are the piston rings bad and allowing excessive oil to pass? The cylinder looked just fine, no scoring at all. There were no metal shavings or anything out of place in the crankcase. I don't see anything obvious.
If the rings are the culprit and I replace the rings, is it likely that any permanent damage has been done?
Has anyone run into this before? Needing some guidance. Thanks
Rick