Kubota won't start & puffs blue smoke
- Thread starter rhamer
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windy acers
Silver Member
WHILE IT IS RUNNING OPEN ONE NUT AT A TIME ON EACH INJECTER LINE FOR ABOUT 30 SEC.TO BLEED IT.YOU CAN ALSO DO THIS TO TEST EACH CYLENDAR FOR WEAKNESS.
woodlandfarms
Super Member
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- PowerTrac 1850, Kubota RTV x900
I know so little about this but I have to take a stab at it.
My Tractor does not have glow plugs. So to start in the winter (or summer) you have to crank it a bit. Hard on the starter but this is how the Deutz are made / implemented on my tractor. So cranking doesn't concern me,and when it starts, it smokes a bit even though it is a new engine.
You said that you use your glow plugs in the summer. Are you sure they are still working? That one is not burned out or disconnected? As I understand it it would be hard to get out of timing with most diesels.
So, my very inexperienced suggestion says take a second look at your glow plugs.
My Tractor does not have glow plugs. So to start in the winter (or summer) you have to crank it a bit. Hard on the starter but this is how the Deutz are made / implemented on my tractor. So cranking doesn't concern me,and when it starts, it smokes a bit even though it is a new engine.
You said that you use your glow plugs in the summer. Are you sure they are still working? That one is not burned out or disconnected? As I understand it it would be hard to get out of timing with most diesels.
So, my very inexperienced suggestion says take a second look at your glow plugs.
banjodunn
Veteran Member
G'day rohan if it is harder to start the longer it sits then i would say you are getting air in the system go along and check all your hoses, clamps and any bolt on connections it is possible to let air in and not fuel out. It may not hurt to pull the fuel line off at the fuel tank and blow the pickup out as i have seen them block there especially when filling from drums. Hope this helps
Jon
Jon
Interesting development.
Along the lines of letting air into the system I was fiddling around and discovered that if I try to start the tractor with the throttle wide open it starts much easier, not as easy as it should be but within about 10 sec of cranking. In fact it seems to be a bit better still if I wiggle the throttle between full open and idle a few times while cranking.
I'm beginning to think it is fuel starvation?
Cheers
Rohan
Along the lines of letting air into the system I was fiddling around and discovered that if I try to start the tractor with the throttle wide open it starts much easier, not as easy as it should be but within about 10 sec of cranking. In fact it seems to be a bit better still if I wiggle the throttle between full open and idle a few times while cranking.
I'm beginning to think it is fuel starvation?
Cheers
Rohan
Soundguy
Old Timer
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- RK 55HC,ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC
when's the last time fuel filters were changed? injectors cleaned or serviced.. even if by addative?
if it was a real starvation case.. I think you'd be down on power.. or unable to make rpms at load.. seeing any of that?
black smoke is a sign of unburnt fuel.. not usually a sign of starvation.. though -can- be a sign of air restriction... both can cause problems... a diesel is basically a big noisy air pump... got to have fuel and air.. and good compression..
soundguy
if it was a real starvation case.. I think you'd be down on power.. or unable to make rpms at load.. seeing any of that?
black smoke is a sign of unburnt fuel.. not usually a sign of starvation.. though -can- be a sign of air restriction... both can cause problems... a diesel is basically a big noisy air pump... got to have fuel and air.. and good compression..
soundguy
Never, although I recently put some additive in the tank to try and fix this problem. I have tried to buy a fuel filter for it twice, but each time the wrong one has been supplied. I am actually having it serviced by the dealer next Friday, so I'm hoping it gets sorted out then.
Yep, I have to have the throttle open much further than I used to and I can only get around 2200 RPM flat out, where as it would easily do 2500+ before.
Cheers
Rohan
Eagleview
Veteran Member
The sure way to test a glow plug is on the bench with a pair of jumper leads and fully charged battery . Earth lead to the case (not the threaded bit) positive to the terminal . Don't heat past cherry red , if it wont heat up , bin it . Testing resistance is not fool proof as when the plug starts to heat a fault can open up and the plug will die again .
Soundguy
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- RK 55HC,ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC
I'd be getting that filter changed post haste.. before trying any more diagnostics..
soundguy
