Thread: Injector service

Hi Peter,
Looks like I'll be eventualy doing mine too soon. There are a few things to note, As Isuzu's use Diesel Kiki fuel system components, they are of superior quality, even better than Denso etc. New tips/ nozzles and a clean/ test is mandatory, and fit ALL new washers and seals. The washers are readily available and easy to fit. (They should come with the injectors when you get them back from the diesel shop.) There is one tapered type at the base of the injector in the head, and 2 (1 either side of the bleed off line) on the top of the injector. BE VERY careful when undoing and removing the bleed off line, as they are easily twisted and can break. Silver solder is the easiest way to fix this, and I have 1 to fix tomorrow as a matter of fact...
The gas escaping you can see is from the tapered washer not sealing.
Just out of interest, and no doubt everyone is sick of hearing this, but my injectors have now seen 460,000km without a set of nozzles...Bad maintenance procedures I know but it goes and starts so well.....

'Embrace your 4BD1, and it will embrace you....'



JC

Just out of interest, how much does an injector service cost? Just asking as new ones from Paddocks are £30ish each (For a 300TDi), which works out at $300ish for the set and shouldn't cost much to post. So...either servicing is cheap, or there's a reason I don't know about why no-one buys new ones!

Jeff, the Tdi ones aren't serviceable, therefore don't waste $$ cleaning them, just replace them when poor performance and spraypattern is evident. The prices vary hugely from vehicle to vehicle, and for example a Denso nozzle for a cruiser 2H engine is quite a lot cheaper than a Diesel Kiki nozzle for the same engine, these engines used either injector/ pump depending on year.

I think mine will be about $120 to $140 per unit to service/ replace nozzles. Maybe more as there are a few different tips for the ones in my 4BD1.

Yes yes, I'll do it soon.

JC

Originally Posted by justinc

Jeff, the Tdi ones aren't serviceable, therefore don't waste $$ cleaning them,

I think mine will be about $120 to $140 per unit to service/ replace nozzles. Maybe more as there are a few different tips for the ones in my 4BD1.

Yes yes, I'll do it soon.

JC

Ah, that explains it - thanks. No plans to do/replace mine (Unless someone tells me I need to!) but I'd just wondered why people did it...

Originally Posted by jik22

Ah, that explains it - thanks. No plans to do/replace mine (Unless someone tells me I need to!) but I'd just wondered why people did it...

Just out of interest, I have 1 customer who is fanatical about filters and correct service intervals, and has the original set of 300Tdi injectors still at 410,000km. He still gets 26 to 30 MPG and drives fairly ' briskly'.

This isn't typical, normally High 200's to low 300's km is about their life span economically. But clean fuel ( Change filters and clean sediment bowl regularly)and EDT or other anti-algae conditioners will prolong their life considerably, case in point above.
I have no plans to replace his injectors yet while it is running so well and efficiently.

JC

its crude but before you go and get them serviced... you might want to do the field check on them

remove them all, turn them upside down and sit them back on their pegs and reattach the injector line

hold a piece of everyday cardboard in front of the 4 injectors and have some one crank the engine over (doing it by hand is ok if you can get a good swing at the crank from about 40 ddegrees BTDC to about 20 degrees ATDC for each cylinder
FULL SAFETY GEAR REQURIED
if you watch it with strong white lighting you will see your spray pattern on the sheet of cardboard and you will get an idea of your droplet formation as well.

if you wind up with an even symetrical pattern with very little sopping on the cardboard I wouldnt get them serviced just cleaned. (which if you run the cleaning fluid through your injector pump you can do yourself but I dont reccomend it)

when you get them back do it again, but only with the worst one from the previous test. If your not happy with that result then get the new nozzles and tips and redo the crank pressures.

why?

a run through clean with just the cleaning agent is usually less than $80 and it has to be done anyway prior to a service (or it should be as it makes doing the crack pressures easier)

Most honest places will do the clean first and then reccomend if you should or shouldnt fork out for new tips and nozzles...

But if in doubt replace.

The bubbles can be from fuel vibrating in the crevice of the injector and the head depending on "bubbles" if they are more like a froth (think minature beer head) and they dont get spat about when you rev up you might be ok with just a leaky return line or injector crown nut. if its changing or blowing big (relatively) "bubbles" then your on the right track.

Originally Posted by Blknight.aus

Most honest places will do the clean first and then reccomend if you should or shouldnt fork out for new tips and nozzles...

But if in doubt replace.

Exacly, but thats the problem isn't it? Finding an injection place that doesen't necessarily want to use your job to pay for their test rig...I have finally found such a place, and WONT be going anywhere else!

JC

awww shucks...

Does this mean you wont let me do them as I have tracked down a hand operated unit that Im trying to justify to SWMBO?


Or do I just keep doing them at work?