Posted by Oliver 500 Wa on May 19, 2019 at 18:43:44 from (73.96.107.61):
Neighbor has a mid-80s garden tractor with a 2 cylinder Lombardini diesel. Super hard starting even in 60 degree weather. My Oliver starts in this weather within a second or 2 of cranking.
He asked me to look at it (like I know anything) and found the "thermostart" system had a broken wire on a solenoid valve and the "glowplug" portion of the system was burned out. Fixed the broken wire on the solenoid and got a new glowplug. Tested all that and it glows red and bursts into a little fire. Install in into the manifold thinking I have it solved but it still takes lots and lots of cranking before it finally fires. When it finally gets running there is a large amount of grayish smoke that clears up in just a few seconds. Once it is running the exhaust is very clean. You have to keep the RPMs up for a couple minutes before it will idle. I checked the valve adjustments and they were fine.
Don't know the full history of the machine. The hourmeter only has about 400 hours on it and it works so it is possible it might be correct. I do not have a compression tester for a diesel so can't check that. The injectors have a carbon buildup but they both spray and appear to have a decent pattern. The pump is driven by lobes on the camshaft so I don't think the injection timing can be messed up or even changed without messing up the valve timing too.
I suppose I should look for a compression tester and send the injectors out for testing, cleaning, calibration what have you.
What else would you folks advise? Are some diesels just hard starters while others will light right off?
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