Just to follow up - it seems like the starting is quite a bit better but still not quick to start. I think there is another issue in that besides being somewhat hard to start, there is a lot of black smoke and it doesn't run for long before it just slows down and stops without load. In putting everything back together I had to remove the head to get a front pre-combustion chamber out of the head that got stuck without bottoming on the copper sealing ring. So I put a new head gasket on and tested compression with the combustion chambers in place and got about 500 psi in each cylinder after several strokes. I have a new fuel bowl and line to the injector pump. I redid the injector to fuel tank fuel return line because I had a bit of leakage there.
Goose, I've shared this Do's and Do-Nots with those having the issues you are experiencing.
How to keep the soot away and ways to prevent having the head warp and crack on these Yanmar engines.
- Do not let the engine idle below 1200rpms for longer than 10mins max at a time. And the time is with 20mins between.
- Do use 10W30 summer and 5W30 winter for engine oil. Do not use the heavy thicker 15W40 as it will holds the heat longer in the engine. Yanmar makes engines to JIS standards, not SAE. So the cooling oil passages are narrower in metric.
- Do keep the air intake filter clean. Clogged filter makes the engine work harder and heat builds up within the engine.
- Do keep the radiator and the screen clean.
- Do check the coolant. Do not use extended life coolants in these vintage machines.
- Do start the tractor slightly above idle.
- Do not race the engine from slow to fast and fast to slow.
- Do slow the engine speed down gradually, idle for 15 seconds then turn the engine off.
Some of these tips are from Deere, some are in the Yanmar USA bulletins and some came from the Yanmar JP website before 2018.
Now, with all of that said, your machine could have an old lazy starter. This happens often with solenoid starters vs. the modern OSGR starters. As the solenoid ages, subject to heat and humidity, the electrical resistance rises. This in turn raises the amp draw from the battery, as the charging circuit is maxed out on the YM series to 35amps, the entire system becomes sluggish. With OSGR starters, this is never the case to bog down like the older solenoid types do.
To help remove the build up of black soot from inside the working combustion of a diesel engine, the use of Seafoam is required. This will work faster than any PowerServe product with better results. Seafoam was originally created just for this purpose, diesel tractors.
Let's us help save your machine before troubles become way wore and costly for repairs. The small ounce of preventing and treatment wards off a huge disaster about to happen.
