Fuel pressure spec..

EarlJ · #1 03-27-2015, 07:00 PM

Ok guys I picked up a fuel pump from the local parts house. It specs at 4-10 psi. Would I be correct in thinking this pressure is too low for the d600? I looked in the service manual and it says 5689 to 4978 psi. That should be the pressure coming out of the injection pump. Assuming my pumps pressure is too low what should the pressure be coming out of the pump? I'm seriously thinking that this is the issue as the engine will fire and run by pouring a small amount of fuel in the intake. Once it fires up, it runs great so it has to be a pump pressure problem, correct?

J-Mech · #2 03-27-2015, 07:12 PM

Quote:

Originally Posted by EarlJ

Ok guys I picked up a fuel pump from the local parts house. It specs at 4-10 psi. Would I be correct in thinking this pressure is too low for the d600?

No, that pressure is fine/correct.

Quote:

Originally Posted by EarlJ

I looked in the service manual and it says 5689 to 4978 psi. That should be the pressure coming out of the injection pump. Assuming my pumps pressure is too low what should the pressure be coming out of the pump? I'm seriously thinking that this is the issue as the engine will fire and run by pouring a small amount of fuel in the intake. Once it fires up, it runs great so it has to be a pump pressure problem, correct?

No.

EarlJ · #3 03-27-2015, 08:44 PM

What would cause it to struggle to start and only fire after fuel is introduced into the intake?

olds45512 · #4 03-27-2015, 08:47 PM

my diesel knowledge isnt the greatest but it sounds like a timing issue.

EarlJ · #5 03-27-2015, 10:00 PM

Thank you, I'll investigate the pump timing..

J-Mech · #6 03-27-2015, 10:08 PM

Quote:

Originally Posted by EarlJ

What would cause it to struggle to start and only fire after fuel is introduced into the intake?

~Low cranking speed (multiple causes)
~Low compression (multiple causes)
~Worn/slobbering injectors
~Worn injection pump
~Poor glow plug "action"
~Timing
~Fuel condition
~Air inlet restriction
~Restricted exhaust
~Worn camshaft
~Incorrect valve lash setting

I'm sure I could come up with more......

EarlJ · #7 03-27-2015, 10:17 PM

Quote:

Originally Posted by J-Mech

~Low cranking speed (multiple causes)
~Low compression (multiple causes)
~Worn/slobbering injectors
~Worn injection pump
~Poor glow plug "action"
~Timing
~Fuel condition
~Air inlet restriction
~Restricted exhaust
~Worn camshaft
~Incorrect valve lash setting

I'm sure I could come up with more......

Well then... lol I'll be checking a lot of things to be sure everything is on point.. time to print the service manual..

EarlJ · #8 03-29-2015, 10:39 PM

So I was playing around with it today and fired it up again. I had it running for A few minutes and what I noticed was the #1 injector has fuel foaming out around where it mates with the head. Do I need to consider replacing the injectors? Also where can I find the throttle cables? These are toast..

olds45512 · #9 03-29-2015, 11:06 PM

Quote:

Originally Posted by EarlJ

So I was playing around with it today and fired it up again. I had it running for A few minutes and what I noticed was the #1 injector has fuel foaming out around where it mates with the head. Do I need to consider replacing the injectors? Also where can I find the throttle cables? These are toast..

i dont have any experience with the kubota diesels but every other diesel ive worked on had seals where the injector meets the block, id advise that if your going to replace one seal that you should replace them all. if your going to have the injectors out it might be good to price having them rebuilt or replaced.

EarlJ · #10 03-29-2015, 11:46 PM

Thanks Olds, I didn't know they could be rebuilt until I started doing some research. I hope I cna find someone local that can do it reasonably priced.