tripper225
Member
Background:
Previous owner purchased new in '55. It is a gas engine. Used last summer to brush cut 30 acres, worked great. Sat all winter. Whoever posted that capital I is used in place of numeral 1 is correct.
Started in May and ran for a short while, had to move brush mower. Parked for a few days, I noticed puddle of oil formed on floor below the transmission housing and a drip of oil on the cotter pin. I had already purchased a used oil pan in good condition because the original was dented with no leaks. I also detected oil on the fly wheel when checking the spark timing so, rear main seal needed refresh. When I pulled the rear main bearing block this is what I found:
The first problem is I believe most of you would say that the lip on the crank seal is facing the rear; wrong!!
The second problem is the crank bearing is severely worn.
In response I have taken the engine off the tractor and disassembled. What I found is:
Four piston rings. The shop manual says four rings are for the diesel engine. Is that so? The number one piston is marked with an "M". The other 3 pistons are not marked at all.
The number 3 piston head only has deep pitting which may be caused by detonation.
After decarbonizing all four pistons number 3 is the only one that is pitted. Why? Is it somehow running on a leaner mixture than number 4?
Please comment on why diesel engine pistons are in this gas engine or on anything else you see that I may have missed.
As always, I appreciate any expertise that you bring to this forum.
Be well
Jim
Previous owner purchased new in '55. It is a gas engine. Used last summer to brush cut 30 acres, worked great. Sat all winter. Whoever posted that capital I is used in place of numeral 1 is correct.
Started in May and ran for a short while, had to move brush mower. Parked for a few days, I noticed puddle of oil formed on floor below the transmission housing and a drip of oil on the cotter pin. I had already purchased a used oil pan in good condition because the original was dented with no leaks. I also detected oil on the fly wheel when checking the spark timing so, rear main seal needed refresh. When I pulled the rear main bearing block this is what I found:
The first problem is I believe most of you would say that the lip on the crank seal is facing the rear; wrong!!
The second problem is the crank bearing is severely worn.
In response I have taken the engine off the tractor and disassembled. What I found is:
Four piston rings. The shop manual says four rings are for the diesel engine. Is that so? The number one piston is marked with an "M". The other 3 pistons are not marked at all.
The number 3 piston head only has deep pitting which may be caused by detonation.
After decarbonizing all four pistons number 3 is the only one that is pitted. Why? Is it somehow running on a leaner mixture than number 4?
Please comment on why diesel engine pistons are in this gas engine or on anything else you see that I may have missed.
As always, I appreciate any expertise that you bring to this forum.
Be well
Jim