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Originally Posted by Superduper
Personally, I would NOT be very happy if my tractor doesn't start on a regular basis without assistance. On the other hand, I probably wouldn't have waited very long before making a stink about it. Don't know if my 3120 would be affected the same way but I have a glow plug system on mine. I find it hard to believe that your tractor doesn't have it, I would think all modern diesels have them. Are you sure? On mine, there isn't a seperate switch: you turn the key to the run position for about 5 seconds before turning to crank position.
I believe your engine is also a 3TNV engine. If that is the case, I'm sure that if glow plugs are not there, you can implement them. Doing a timing change may help but it will alter the fuel curve completely. Sounds like all you need is a starting aid.
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If you have a 3120 compact utility tractor, and think you have a glow plug system, I'd suggest you read the owner's manual:
9. For cold weather starting, use the intake air heater system. Activate the intake air heater system by pushing in the ignition key switch with the key, and holding it there for the required time:
10 - 15 seconds for temperatures as low as -18C (0-F).
15 - 30 seconds for temperatures below -18C (0-F).
You have an intake air heater system just like all the Yanmar engine based 3000 series tractors you DO NOT have glow plugs.