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 12-08-2006, 11:48 Post: 137742
cpdtwo



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 engine compression

can not get 1500d to start . fuel system is good,injector where just redone, new pistons and rings in june, was running till alternator went out and now will not start. did a compression test but cylinders are about 300lbs. when cracking only white smoke out of the exsust. ckeck the vent pipe and do have a presure build up when held closed and cranking the motor. does anyone know what the pressure in the engine should be and is 300 lbs good or bad, did a check dry and wet found no real difference.
help






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 12-08-2006, 12:05 Post: 137744
Murf

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Not starting, or even firing, and making a little white smoke is an indication of air in the injector lines.

Get the battery well charged, and with something else on cables to boost it, try starting it using a little WD-40 as you would quick-start or ether, straihght down the intake.

I'd bet it at least tries to fire on that.

If you can get it to run on WD-40 or something like that, you can often get it to self-purge the fuel lines enough to run, after that a little hard running will often clear it up.

Best of luck.






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 12-08-2006, 13:38 Post: 137748
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Alternatively, purge the fuel system of air. Loosen the fitting where the fuel (from the filter) enters the injection pump. Use the hand pump until raw fuel (no bubbles) comes out, then tighten the fuel line back down.

Next, loosen the hex head compression fittings that hold the hardlines to the fuel injectors. With the tractor in neutral and the compression release open, crank the engine. Again, watch for raw fuel around the compression fittings (no bubbles) then tighten them back down.

Start engine

//greg//






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 12-08-2006, 13:46 Post: 137749
cpdtwo



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tryed the wd40 no luck with that. did find out the min compression should be 325 and i'm there in one and just below it in the other. check the injectors when they where out and they seem to be spiting out fuel






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 12-08-2006, 13:49 Post: 137750
cpdtwo



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have bled the system till fuel comed out the lines still nothing. and have been turning it over with my truck hook up to the battery.






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 12-08-2006, 14:03 Post: 137751
Murf

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A diesel is a pretty simple beast.

If you have compression and fuel, it WILL fire, period.

Don't be afraid to give it LOTS of fuel, of almost (ether excepted) kind.

If you're quick enough on the trigger, you can make a diesel run almost indefinitely on WD-40, I've done it.

It should also fire with a LOT less than 300 psi of compression. In fact, the white smoke is just that, the result of combustion. It just means you're not getting enough fuel (too much is black smoke) for it to fire enough to spin the motor, or to hear it.

If you're carefull, give it a puff of ether and see if it fires on that, but not too much.

Best of luck.






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 12-08-2006, 14:04 Post: 137752
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Is it possible your compression release is stuck open? Because even if it was a stuck valve, it should start/run on as few as one cylinders.

If that's not the case - and since you said "the injectors were just redone" perhaps the rebuilder used the wrong springs/shims and you're getting insufficient aerosol to the pre-combustion chamber

//greg//






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 12-08-2006, 14:35 Post: 137753
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release seems to be working fine, I do get presure out of the breather tube when held closed, don't know if it means anything. read that if you hold it closed and you have bad rings it would pop the dip stick, not that much presure. and how would I know if they used the right shims, was done by an authoried Yanmar injector shop.






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 12-08-2006, 14:59 Post: 137755
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I am not a mechanic but: is it possible you have a clogged fliter reducing amount of fuel or a cut off valve partly shut or a fuel cutoff for emergency engine shutdown partly pulled.

Seems odd it stopped with your alternator. Is there a electric fuel shutoff valve not opening fully.

Murf is correct on the WD 40, you can start and run a diesel with that as your only fuel source if you keep the spraying right on volumne.

With the recent chill could you have summer fuel and it is cold enough where you are the fuel is too thick?

Hope you well.






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 12-08-2006, 15:14 Post: 137756
cpdtwo



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filter is clean and fuel is flowing freely to pump, the only fuel shut off is before the pump and it manual,






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Discussion Boards > Active Subjects > Messages as Posted > Yanmar Tractors Forum

Thread 137742 Filter by Poster:
Art White 1 | auerbach 1 | Chief 1 | cpdtwo 11 | earthwrks 5 | funkster 1 | greg_g 3 | kthompson 2 | Murf 3 | randywatson 2 | SG8NUC 1 |




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