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jimc1390
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Post subject:
 Posted: Feb 08, 2010 - 08:07 PM
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Joined: Jan 11, 2009
cornwall
Posts: 1018
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[quote="Powerrabbit"] if the tips have burnt and holes have enlarged letting in too much fuel to burn, quote]
fuel is regulated, so it wouldnt be letting to much fuel, enlarged holes would prevent the fuel from atomising properly and there fore struggling to burn it, resistance to flow creates preasure, the higher the preasure the better the atomisation which equals a better more efficent burn of diesel |
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db 990 selectamatic
case ih 1594 com ed
db 1210 vq cab
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bonserdb
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Posted: Feb 08, 2010 - 08:28 PM
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Joined: Oct 08, 2007
wales
Posts: 455
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if injector nozzles are damaged it can either be over fueling which burns them. as jim says the fuel is regulated per amount to fire. burnt nozzles just dribble the fuel in. usually you get a knock from this cylinder. or the other way the nozzles can be damaged is when any tom dick or harry who has not much idea of what they are doing place a cylinder head flat on its face on a concrete floor! causing damage to the nozzles. seen this on a few tractors.
i suppose a injector with the wrong pressure setting could cause a pushrod to bend. usually hear a popping noise in the inlet manifold. |
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proud owner of a beloved bonser90d, 880 selectamatic and 1490 2wd synchro, and the mighty 1594!
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6-POT-PHIL
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Post subject:
Posted: Feb 08, 2010 - 10:51 PM
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Joined: Dec 22, 2007
Huddersfield, W Yorks. (Home of David Brown Tractors)
Posts: 953
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The pistons can hold a fair bit of diesel in top of them in the combustion chamber and valve cut outs before it starts to seep down through the rings. If thermostart is stuck open it will suck in fuel from sucton in inlet manifold pretty rapid.
Please let us know your findings n.i/1594
Phil |
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MR JULY 2010:-)!!!
1961 850 Implematic Ex DB test tractor
1987 'E' 1594 4WD Hydra-Shift
 
Six in line sounds mighty fine!!
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john1694
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Post subject:
Posted: Feb 08, 2010 - 11:09 PM
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Joined: Jan 12, 2009
Cumbria
Posts: 675
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Yes, fuel is regulated from the inj. pump; so this is not going to bend rods - though to be fair to PR it can cause horrendous imbalance in running and "knocking".
The T/Starts are fed from a small reservoir which, in turn, is fed from the fuel leak-off. They are only filled, therefore, when the engine is running. They do not hold a sufficient quantity of fuel to "lock" a cylinder at the best of times, and even if they did, the starter would not be able to turn the engine past the locked moment. In addition, the combustion chamber is not solely composed of the swirl-chamber and valve-recesses, but also has a minimal face-to-head distance that would more than accommodate the contents of the T/S reservoir. But, of course, once the machined recesses were full, it would run down past the rings.
I would be looking elsewhere for the problem of bent push-rods...at least initially. |
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n.i/1594
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Post subject:
Posted: Feb 12, 2010 - 10:10 PM
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Joined: May 08, 2009
Northern Ireland
Posts: 18
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| Hi everyone got the 1594 up & running last night it was the heater plug did it!!!! the plug leak into the head & as the tractor was not doing alot the head gum up with the mixer of fuel & carbon it just goes to show you that the big 6's love to be worked many thanks to everyone for there help. |
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6-POT-PHIL
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Post subject:
Posted: Feb 12, 2010 - 10:20 PM
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Joined: Dec 22, 2007
Huddersfield, W Yorks. (Home of David Brown Tractors)
Posts: 953
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I knew it would be that heater plug, get an inline tap on like i said & save it from happening again.
Glad you got it fixed.
Phil  |
_________________
MR JULY 2010:-)!!!
1961 850 Implematic Ex DB test tractor
1987 'E' 1594 4WD Hydra-Shift
Six in line sounds mighty fine!!
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jimc1390
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Post subject:
Posted: Feb 12, 2010 - 10:20 PM
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Joined: Jan 11, 2009
cornwall
Posts: 1018
Status: Offline
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| not too serious then |
_________________
db 990 selectamatic
case ih 1594 com ed
db 1210 vq cab
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daithik81
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Posted: Feb 17, 2010 - 09:56 AM
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Joined: Jan 06, 2009
Co.Mayo, Ireland
Posts: 42
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Post subject:
Posted: Feb 18, 2010 - 05:00 PM
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Joined: Feb 08, 2010
N. Wales
Posts: 88
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Those thermostarts are horrible things! Mine luckily only caused some smoke.After several attempts I finaly fixed it.
But still all the ones I bought were faulty from new!
With all sorts of problems from a stuck/faulty valve to a non functioning heat coil. Even a plug with a genuine caseIH package was bad.
I had to replace it (10 mile trip every time) 6 times until I got a good one 
Daithik81, Can you give more info on that Valve? Would like to do the same to mine, thanks. |
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bonserdb
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Post subject:
Posted: Feb 18, 2010 - 06:37 PM
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Joined: Oct 08, 2007
wales
Posts: 455
Status: Offline
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heater plugs are a real pain. i have bought vapormatic ones and they are useless. the only ones i found any good were ones made by ISKRA they may be made in slovenia but i have never had a bad one yet.
matt |
_________________
proud owner of a beloved bonser90d, 880 selectamatic and 1490 2wd synchro, and the mighty 1594!
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boyakas
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Post subject:
Posted: Feb 19, 2010 - 02:49 PM
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Joined: Feb 18, 2010
staffordshire
Posts: 9
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| Just had 2 pushrods bend on my 990. It was down to a sticking valve which bent the pushrod, then knocked the next pushrod off its seat causing that to bend. All up and running no but got to re-adjust the tappets thanks to the correct setting off POWERRABBIT. |
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john1694
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Post subject:
Posted: Feb 19, 2010 - 11:24 PM
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Joined: Jan 12, 2009
Cumbria
Posts: 675
Status: Offline
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Boyakas; this sounds very familiar! 
ni/1594's last post is a little unclear - and I wonder if this is the actual symptom - even if a leaking T/S was the initial cause? |
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daithik81
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Post subject:
Posted: Feb 24, 2010 - 03:10 PM
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Joined: Jan 06, 2009
Co.Mayo, Ireland
Posts: 42
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| david1690 ... its just a simple air valve, it seems to work fine with diesel. I hope this doesn't start to leak too !! |
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