FordnMassey
Silver Member
- Joined
- Jan 22, 2022
- Messages
- 171
- Tractor
- ford 3000 and MF35
Hi,
I have an L48N single cyl air cooled diesel engine running a water pump that has become very smokey. The smoke is black and sooty, making soot on anything nearby. It was mild when I bought it second hand (unknown hours) around 100 hours ago, and suddenly became very heavy recently. It produces it at idle, light load and heavy load. I am trying to find the cause of the smoking. It sounds like it is producing less power and not quite reaching full rpm - I can't put a tachometer on it.
I pulled the injector and hand cranked the motor and produced 4 neat jets of diesel spray at 90deg to each other with no dribble before or after. I think this is fine. Following that I ran injector cleaner thru it and no change.
I pulled the oil fill cap while running and eased it clear for around 1 second. Large amounts of blow by are present - enough to think I was looking at an exhaust outlet.
I am figuring the smoke is sump oil being burnt, likely thru the rings, which are also the source of the blow by.
Questions:
1). Am I right in thinking rings?
2). can anyone suggest a tool set or brand/item number for compression testing this? Looking online at kits I see a variety of inserts but none appear to match the injector on the Yanmar.
3). Could a valve issue cause sufficient oil burn to give this appearance?
Thanks in advance for your help.
FordnMassey
I have an L48N single cyl air cooled diesel engine running a water pump that has become very smokey. The smoke is black and sooty, making soot on anything nearby. It was mild when I bought it second hand (unknown hours) around 100 hours ago, and suddenly became very heavy recently. It produces it at idle, light load and heavy load. I am trying to find the cause of the smoking. It sounds like it is producing less power and not quite reaching full rpm - I can't put a tachometer on it.
I pulled the injector and hand cranked the motor and produced 4 neat jets of diesel spray at 90deg to each other with no dribble before or after. I think this is fine. Following that I ran injector cleaner thru it and no change.
I pulled the oil fill cap while running and eased it clear for around 1 second. Large amounts of blow by are present - enough to think I was looking at an exhaust outlet.
I am figuring the smoke is sump oil being burnt, likely thru the rings, which are also the source of the blow by.
Questions:
1). Am I right in thinking rings?
2). can anyone suggest a tool set or brand/item number for compression testing this? Looking online at kits I see a variety of inserts but none appear to match the injector on the Yanmar.
3). Could a valve issue cause sufficient oil burn to give this appearance?
Thanks in advance for your help.
FordnMassey