Lary-74426
New member
- Joined
- Mar 25, 2008
- Messages
- 12
This one is going to take awhile to explain....I have a Yanmar 3 cylinder diesel tractor. The side covers read "F235" while the instrument panel reads "F255". I purchased it with 23 hours on the clock, it is now approaching 400 hours.
The Summer of 2014 we took it to Kansas to do some work on the family farm.. it started overheating, but never into the red zone on the gauge. About every hour I would have to stop and hose down the radiator to cool it down, but it was never short on water.
Brought it back to Oklahoma for the Winter, and last Spring noticed a water leak at the radiator. Pulled the radiator and the top tank had separated, thought that I did not get enough antifreeze in it, and soldered the tank back on. Next it blew the top radiator hose. Next it blew the seal in the water pump. Finally dawned on me that it was building to much pressure, but the cap never blew by. Tried running it with the cap off when I noticed that exhaust was coming out of the radiator.
Ordered up a head gasket and head bolts. Upon removing the head I found that the new gasket had a rubber "O-Ring" molded into the gasket, on the original gasket it was missing.
Cleaned up the block and head, installed new gasket and torqued the new head bolts.
Stupid me, while installing the rocker arm assembly, I did not properly align the push rods, and broke two rods, both center cylinder. Ordered up and installed new push rods.
Upon initial start up I could hear a weird sound coming from the intake, and it had decreased power. Pulled the head again and found that I had bent both valves, but did not see any piston damage.
Ordered up and installed two valves and another $70 plus head gasket. This time it ran good but wanted to overheat again. Finally found that the radiator was partially plugged with exhaust. Soaked the radiator overnight in Super Clean, back washed it and it has not overheated again.
NOW the problem is that it is burning oil, so much that it is dripping out of the muffler, about a pint an hour. Decided that valve seals were to blame, so ordered and replaced all six. Same problem. There is no blow by, nothing coming out of the breather, so I am assuming that the problem is top end.
I am at my whit's end...what am I missing?
Any help would be greatly appreciated.
The Summer of 2014 we took it to Kansas to do some work on the family farm.. it started overheating, but never into the red zone on the gauge. About every hour I would have to stop and hose down the radiator to cool it down, but it was never short on water.
Brought it back to Oklahoma for the Winter, and last Spring noticed a water leak at the radiator. Pulled the radiator and the top tank had separated, thought that I did not get enough antifreeze in it, and soldered the tank back on. Next it blew the top radiator hose. Next it blew the seal in the water pump. Finally dawned on me that it was building to much pressure, but the cap never blew by. Tried running it with the cap off when I noticed that exhaust was coming out of the radiator.
Ordered up a head gasket and head bolts. Upon removing the head I found that the new gasket had a rubber "O-Ring" molded into the gasket, on the original gasket it was missing.
Cleaned up the block and head, installed new gasket and torqued the new head bolts.
Stupid me, while installing the rocker arm assembly, I did not properly align the push rods, and broke two rods, both center cylinder. Ordered up and installed new push rods.
Upon initial start up I could hear a weird sound coming from the intake, and it had decreased power. Pulled the head again and found that I had bent both valves, but did not see any piston damage.
Ordered up and installed two valves and another $70 plus head gasket. This time it ran good but wanted to overheat again. Finally found that the radiator was partially plugged with exhaust. Soaked the radiator overnight in Super Clean, back washed it and it has not overheated again.
NOW the problem is that it is burning oil, so much that it is dripping out of the muffler, about a pint an hour. Decided that valve seals were to blame, so ordered and replaced all six. Same problem. There is no blow by, nothing coming out of the breather, so I am assuming that the problem is top end.
I am at my whit's end...what am I missing?
Any help would be greatly appreciated.
