john deere 659 2cyl yanmar engene hard to start

cdengel · Apr 16, 2015

my jd650 is hard starting. need info on pulling injectors to pull comp test.

Tx Jim · Apr 16, 2015

Have you checked to be sure glowplugs are operating correctly?

buickanddeere · Apr 16, 2015

Is the valve lash properly set?

Mike M · Apr 16, 2015

650 does not use glow plugs.

Mike M · Apr 16, 2015

Been awhile since I did our 750 but you unhook the lines and hold down clamp and then carefully try and pry them up out IIRC.

Tx Jim · Apr 16, 2015

(quoted from post at 12:21:51 04/16/15) 650 does not use glow plugs.

OK my mistake does thermostart operate correctly?

Russ from MN · Apr 16, 2015

Has it always been that way, or is this something new? Our 4600 has 750 hours on it and I have never really heard it turn over, it starts immediately! Any time it's below about 10F I preheat it, I really baby it! Lately I have started adding about 2 ounces of 2-stroke outboard oil to each 5 gallons of fuel.

cdengel · Apr 16, 2015

It has no glo plugs.

cdengel · Apr 16, 2015

I made a tool to fit my slide hammer and tried to pull the injector it did not move. all lines were unhooked and hold down clamp was removed. I think the first thing I need to do is a compresssion check.

buickanddeere · Apr 16, 2015

(quoted from post at 12:09:00 04/16/15) my jd650 is hard starting. need info on pulling injectors to pull comp test.

Is the clutch pedal depressed and the three point hitch lowered when cranking?
What is the voltage measured from the threads of the main battery post on the starter with relation to the starter's cast body? Check that in 2 minutes before ripping everything apart.

David G · Apr 17, 2015

I would suspect slow cranking, low compression or air in the lines before the pump.

buickandeere · Apr 17, 2015

(quoted from post at 06:01:25 04/17/15) I would suspect slow cranking, low compression or air in the lines before the pump.

Some of those older high mileage VW diesels developed hard starting and required extended cranking. The low pressure pump inside the injection pump would wear out. Some VW owners add an electric fuel pump .
Still suspect low cranking rpms as a significant factor. Low compression due to out of adjustment valves as another .

cdengel · Apr 17, 2015

Do you have any idea what the valves are set at?

buickanddeere · Apr 17, 2015

(quoted from post at 15:06:28 04/17/15)
Do you have any idea what the valves are set at?

Such info would possibly be in the operator's manual and certainly in the service manual.
The nice folks at 1-800-522-7448 have real JD manuals on CD and hard copy.
The parts manual is free on the JD web site.
Don't bother with an It manual. They are best rolled up and used to swat flies.
Have you measured the voltage while cranking?

big a · Apr 19, 2015

All good points above, and things I'd look at.
Worked on quite a few of these, back in the day, and found a lot of them had rings stuck and gunked up. No real wear, and assumed it was caused by start/stop operation, and never getting up to temp.
If compression checks low, I had good luck pulling nozzles, and soaking top end with BG44k, or GM Top Engine cleaner, to loosen up carbon, then blow out, reassemble, and get it started.
Cardboard over radiator and let it get hot...not meltdown hot, but up to about max safe temp, and let it run that way.
That would usually free things up enough to bring compression up.
Also, tap muffler with rubber mallet while running at hi idle....these will accumulate an unbelievable amount of soot and carbon!

john deere 659 2cyl yanmar engene hard to start

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