98 12V injector install question - Dodge Cummins Diesel Forum
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post #1 of 5 (permalink) Old 08-08-2006, 11:53 AM Thread Starter
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98 12V injector install question

I'm about to install the new 330 injectors in my '98 12V. What I need to know is after you pull the old injector, how do you clean the injector pocket before installing the new injector into it? It's probably pretty grungy in there. I know that the new injector has a copper washer on the end that has to seat/seal against the head. I need to make sure the mating surface is clean. How do I accomplish this without getting crap into the cumbustion chamber?


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post #2 of 5 (permalink) Old 08-09-2006, 12:41 AM
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When you get ready to pull your old injectors spend extra time and effort cleaning the area around the base before you pull anything. I use an oil mix in a pressure gun, but a can of spray brakecleaner will do the job just as well. Then, remove the old injector and pull the old copper washer and discard it, and you will find all that is necessary is a bit of oil on a cloth and a very careful probe and wipe and you are in business.
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post #3 of 5 (permalink) Old 08-09-2006, 04:14 PM
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how do the 330 injectors go, lot of smoke?

1998 Cummins 12 valve
#100 Fuel plate slid forward, AFC full forward, dynomax exh., starwheel fully turned, green air cleaner, washer GSK mod,fully built tranny, triple disk TQ, autometer pyro
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post #4 of 5 (permalink) Old 08-09-2006, 10:06 PM Thread Starter
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OK, Got the injectors installed. Also installed a #8 plate, full forward, the GSK washer mod, new fuel filter, and cleaned the pre-filter, installed the BHAF, and adjusted the valves.
When I started it, the idle was low, so I fixed that.
It runs like a totally different truck. The engine even sounds different. It is very responsive now. When you step on the go pedal, you'd better be ready to go.
By the factory tach it raps to a bit over 3K before it defuels.
The only down side I've found so far is it does let out some smoke when you put your foot in it. I backed the star wheel off (tightened) a couple of turns and that seemed to tone the smoke down a bit. I'm not sure exactly what the star wheel does, or how far is safe to tighten it. The truck has dual exhaust, so it sprays a nice smoke cloud on the cars behind me. I'm not too crazy about that. I'll work on it a bit more. Maybe slide the #8 plate back towards the middle? Time to experiment I guess...

Long winded answer to your question there. The short version is, So far I like the 330's. Considerably more power, but I'm sure that that's not all from the injectors. The motor is definately getting more fuel...

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post #5 of 5 (permalink) Old 08-09-2006, 11:07 PM
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Rich, you can tighten the starwheel all the way if you want. What it does is control the pre-boost fueling. Once you build 8-10 psi boost it is no longer in the picture. If you back it off too far your truck will be a real dog 'til the turbo lights, then hang on!! You may want to try putting your plate about 3/4 of the way forward. That seems to be about the place most engines like them. To far forward and all you seem to get is more smoke.

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