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SMOKE ON COLD START UP

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SMOKE ON COLD START UP

Postby john62m » Mon Sep 03, 2012 10:05 pm

got another4jg2t gear drive motor from motor importer to replace motor that had been dusted when i put it in it started first go but it had a miss when cold i decided to do the injectors they were corroded in and when i pulled them out the heat shields and copper washers were buggered i had trouble getting them outi was also dropping rubbish down hole so i decided to pull the head off i did the head up got the injectors done replaced washers and glow plugs when i start it cold it throws out heaps of smoke i think it is diesel smoke because it hurts my eyes could the pump need doing up the motor doesn,t breath at all but is pushing enough oil out of the pvc valve to coat the inside of the pipes also am not shure if the vacuumpipes are hooked up properly also could you tell me the differance between gear driven and belt driven 4jg2 motors are they interchangable i would be gratefull for any information i need to get the smoke issue fixed it wont pass rego the way it is! regards john62m
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Re: SMOKE ON COLD START UP

Postby pig75 » Tue Sep 04, 2012 5:44 am

The only gear drive motors i have heard of were the 4ja1 & 4jb1. I thought all 4jg2 motors were belt drive
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Re: SMOKE ON COLD START UP

Postby john62m » Tue Sep 04, 2012 6:40 am

it is definately a 4jg2t gear drive it has a ve type fuel pump
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Re: SMOKE ON COLD START UP

Postby john62m » Tue Sep 04, 2012 8:24 am

although the information i am looking for would be good i am not only here for that reason it would be good to get it sorted so i can use it i have had a stroke i try to do the work myself even if it takes me twice as long as it should i would like to get this thing on the road and use it before i end up on the other side of the grass
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Re: SMOKE ON COLD START UP

Postby geeves » Tue Sep 04, 2012 9:18 am

have you still got the old injectors? How many holes in the bottom of them?
Very few markets got the gear drive 4jg2 Aussi was one. The gear drive 4jb1 is far more common and Im wondering if you got a 4jb1 by importers mistake and now have 4jg2 injectors in it. The heads on these are so different that the wrong injector will not work correctly.
Also when you had the head off what shape was the combustion chamber
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: SMOKE ON COLD START UP

Postby john62m » Tue Sep 04, 2012 3:02 pm

thanks for getting back to me i am sorry about the email directly to you when i first asked about the motor i could,nt work out how to get on the forum at that stage the injectors where the old ones done up regards john
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Re: SMOKE ON COLD START UP

Postby geeves » Tue Sep 04, 2012 3:50 pm

what about the head?
4jb1 has a flat head and dished pistons 4jg2 has flat pistons and dished head
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: SMOKE ON COLD START UP

Postby john62m » Tue Sep 04, 2012 3:59 pm

pistons are definately flat on top with small recesses for valves the head is dished they asked if i wanted belt or gear drive it has 4jg2 on the back left hand side of block as well as engine number
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Re: SMOKE ON COLD START UP

Postby Roderunner » Tue Sep 04, 2012 4:25 pm

It sounds like there is some air being sucked into the injection pump along with the diesel. The hand priming pump often develops a leak, as do hardened rubber fuel lines. I rigged up a 12 volt fuel pump on mine to ensure that bugger all air gets into the system, it works well! I have seen a diesel blow clouds of blue smoke when the injector lines were put back on wrong,it's really easy to muck up on the pump end, the engine still ran though, just not very well. I can check out my injector pipe position on the pump if you don't have another to copy off!
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Re: SMOKE ON COLD START UP

Postby geeves » Tue Sep 04, 2012 5:34 pm

There will be an engine manual in your bigpond email in about 5 minutes
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: SMOKE ON COLD START UP

Postby john62m » Tue Sep 04, 2012 6:42 pm

do you think i should replace fuel lines when i pump primer pump it doesn,t hold pressure for long i think i have fuel lines on properly but it would be good to check thank you john is the fuel pump you used one of those little retangular twelve volt ones
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Re: SMOKE ON COLD START UP

Postby Roderunner » Tue Sep 04, 2012 7:52 pm

The small rectangular pumps work ok, (Facet is one brand) I think that they are around $35. on ebay, $65. locally, put it just before the fuel filter. When I mentioned injector lines I was talking about the steel lines going from the injector pump to the injectors (just to be clear), they fit the wrong way too, resulting in clouds of smoke.
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Re: SMOKE ON COLD START UP

Postby john62m » Tue Sep 04, 2012 8:07 pm

ok will check my injector lines from pump to injectors i can see that if they wern,t on properly that would put out the timing wouldn,t it that price for fuel pump wont break the bank i will get one of them thank you
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Re: SMOKE ON COLD START UP

Postby Roderunner » Tue Sep 04, 2012 8:09 pm

I will have a gander at my lines to see which goes where
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Re: SMOKE ON COLD START UP

Postby Roderunner » Tue Sep 04, 2012 8:13 pm

Looking at the back of the injection pump- 10 oclock position goes to cylinder 1, 8 oclock to injector 2, 4 oclock to injector 3, 2 oclock to injector 4
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Re: SMOKE ON COLD START UP

Postby john62m » Tue Sep 04, 2012 8:19 pm

thank you will check it out tomorrow afternoon
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Re: SMOKE ON COLD START UP

Postby john62m » Wed Sep 05, 2012 6:42 am

just wondering roadrunner i looked on ebay and found a pump so do i need a low pressure one and would it have to be hooked up so it has constant pressure or only when the motor is running and thanks very much for the work shop manual geeves it has a very informative trouble shooting section
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Re: SMOKE ON COLD START UP

Postby Roderunner » Wed Sep 05, 2012 7:21 am

Low pressure is the safest bet, 5 psi should be good, more pressure than that is better for performance but increases the likelyhood of the injection pump developing a leak through old seals (usually the throttle shaft seal). My pump comes on when I turn the ignition on, the small pumps have 2 non return valves built in to them, so fuel can't drain back into the fuel tank overnight. I wouldn't be too concerned about a bit of smoke on cold start up if it only lasts for 15 seconds or so, most of the older diesels do this!
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Re: SMOKE ON COLD START UP

Postby john62m » Wed Sep 05, 2012 9:12 pm

roderunner i checked out my fuel lines from pump to injectors they are all ok i also ordered fuel pump it should be here by early next week i also found a very small leak from hand primer that wouldn,t be helping would it ?
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Re: SMOKE ON COLD START UP

Postby Roderunner » Thu Sep 06, 2012 9:26 am

john62m wrote:roderunner i checked out my fuel lines from pump to injectors they are all ok i also ordered fuel pump it should be here by early next week i also found a very small leak from hand primer that wouldn,t be helping would it ?


No definitely allowing air into the system , which gives a crap injector spray possibly resulting in unburnt diesel during the combustion event =white smoke!
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