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Old 09-01-2009, 12:37 AM   #1 (permalink)
wordtoyourmom
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Replacing injector nozzles?

I've got a '97 Sierra that's been down for 2.5 years with a bad injector pump. Just picked it up on the weekend. Over the next month I'll slowly get her together, and part of my plan was to replace the injectors. I noticed DCP has 40hp injector nozzles for something like 80 bucks on Ebay...that sure looks a lot better than the 200 or whatever the injectors themselves would cost. What's involved with replacing just the nozzles? Is this something your average shadetree mechanic with a reasonable level of common sense can pull off?
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Old 09-01-2009, 01:45 AM   #2 (permalink)
chevyinlinesix
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After installing new nozzles, you have to set the pop pressure correctly by adding or removing shims inside the injector body. To do this, you need

a)shims
b) pop tester
c) More things that I don't know about because I have never heard of anyone doing their own nozzles, but I've been wrong ONCE before.
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Last edited by chevyinlinesix; 09-01-2009 at 01:45 AM. Reason: spelling
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Old 09-01-2009, 08:27 AM   #3 (permalink)
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Quote:
Originally Posted by chevyinlinesix View Post
After installing new nozzles, you have to set the pop pressure correctly by adding or removing shims inside the injector body. To do this, you need

a)shims
b) pop tester
c) More things that I don't know about because I have never heard of anyone doing their own nozzles, but I've been wrong ONCE before.
Once??


































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Old 09-01-2009, 08:31 AM   #4 (permalink)
Randy_the_Hack
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Quote:
Originally Posted by wordtoyourmom View Post
I've got a '97 Sierra that's been down for 2.5 years with a bad injector pump. Just picked it up on the weekend. Over the next month I'll slowly get her together, and part of my plan was to replace the injectors. I noticed DCP has 40hp injector nozzles for something like 80 bucks on Ebay...that sure looks a lot better than the 200 or whatever the injectors themselves would cost. What's involved with replacing just the nozzles? Is this something your average shadetree mechanic with a reasonable level of common sense can pull off?
Sometimes you get what you pay for on eBay... which is why some guys refer to it as "fleaBay". I don't know this guy from Adam. Listen to the guys out here - most of 'em have been there, done that, and they've got the busted knuckles and dents in the wallets to prove it. Good luck...

BTW, that's an interesting user name...
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Old 09-01-2009, 11:04 AM   #5 (permalink)
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item b is the key. If you have that, then do it, otherwise buy it from a respectable (key) rebuilder or new. If you don't have a proper injector, not only your truck will run sluggish but there is a chance to mess up the engine like piston, etc. It will be more expensive than a couple of hundred dollars more.
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Old 09-01-2009, 03:20 PM   #6 (permalink)
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i personally called heath on this he said nozzles are a NO NO you get bad parts it wont atomize the fuel right and you kill a piston or the pressures will be off and so on, it will cost you more to buy a nozzle kit and have someone at a shop where its clean and has the proper stuff to do it right than go buy the HO injectors from heath IMO i would go to heath for something like that or find a reputable place to get remaned injectors just my 2 cents
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Old 09-01-2009, 05:50 PM   #7 (permalink)
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Changing the nozzles is not that bad a job.I do all of my own and for others.

You do need a pop tester and a lapping stone or piece of sheet glass and crocus cloth.
you also need an assortment of diff sizes shims to get all inj to within 50 psi of each other.
Use Bosch or Delphi nozzles only,the rest is junk IMO

IMO Bill heath is out to lunch with his price on his injectors
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Old 09-01-2009, 08:05 PM   #8 (permalink)
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Heath and BD both seem out to lunch on their prices, which is a shame because BD is about 5 minutes away from me. Unfortunately "budget project" doesn't even begin to describe this truck, so I'm looking for every way to save a few bucks. But I definitely don't have a pop tester or even know what it is, so I'll see about getting complete injectors.


This is the first diesel I've ever owned, so I'm completely new to all this, I just know that diesel equals better fuel mileage than gas and I'm getting really tired of crappy fuel mileage. All advice and help from you guys is much appreciated!
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Old 09-02-2009, 11:37 AM   #9 (permalink)
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i got a local shop who said he will bulid me injectors for i think 340 bucks. built with bosch nozzles. poptested etc. the guys had his own business for 20 yrs. specializing in pumps and injectors. worked for a company b4 he opened his own business. that much experience and him being local, he's guna do my work. fair price too. should i just go with stock nozzles or if he cant get the marine nozzles should i go with them? thanks
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Old 09-02-2009, 05:04 PM   #10 (permalink)
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Quote:
Originally Posted by dieselmafia View Post
i got a local shop who said he will bulid me injectors for i think 340 bucks. built with bosch nozzles. poptested etc. the guys had his own business for 20 yrs. specializing in pumps and injectors. worked for a company b4 he opened his own business. that much experience and him being local, he's guna do my work. fair price too. should i just go with stock nozzles or if he cant get the marine nozzles should i go with them? thanks
I would just get the stock nozzles,set to 2250 or 2300 psi.It'll give you a snappier engine.
The marine nozzles wont do any good without the IP to feed them,plus,they are at least twice the price of stock nozzles.
$340 is a damn good price, considdering the stock nozzles take up half the cost allready.
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98 GMC 2500 hd sle 6.5td ext cab l box 4x4 auto 4.10 difs 268000 km. HOME REBUILD ENGINE at 268.000 km,currently 307.000
Removed CDR an installed PROVENT CRANK CASE OIL SEPERATOR/VENTILATION VALVE,3 1/2" straight pipe.
PMD heatsink relocated to inside air stream in pass fender between batt and air filter.PMD is easely accessable.
Other mods, to nummerous to mention.
95 GMC SL 2500 6.5td ext cab sh box auto, 409.000 km,CDR vented to atmosfeer at 307 k, remote pmd, extra glow bypass/LP test switch, relocated OPS ,in cab fuel gauge .High idle switch,new paint.Foot dimmer swich for simultaniously high/low beam. The Wife's pride and joy.
89 GMC 2500 sle 4x4 ext cab 6.2 na stock 740000+ km, engine rebuilt at 660000 km, rusting out now, but runs like new.
Waldon Wheelloader repowered with 6.2 na.
3 tractors dsl ,72 AC 940 whj loader,ASV 4810 Positrack skidsteer
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