Injector primer

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Mopar1973Man

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1996, 2002
Engine
1996 Dodge 1500 (V8-5.9L) & 2002 Dodge Ram 2500 (5.9L Cummins)
Ok Gang...

I figure I would do a bit of show and tell of the Cummins injectors...

Here is a stock 235 HP injector.
2yk0tmv.jpg

Now take notice to how tiny the fuel spray holes are. (x10 mag)
291dyzs.jpg

Now once you disassemble the injector by loosen the collar nut this is what is inside. (Body, adjustment shim, spring, pintle seat, mid-body, pintle, nozzle, collar nut, copper shim)
2s8r78l.jpg

Now remember you never want to mix and match parts from one injector to another. All these parts are machined for this particular injector.

Here is the pintle needle and the nozzle of the injector.

2llzpz5.jpg

The top hole is the fuel hole this hole allows the fuel to reach down under the pintle and using fuel pressure lift the pintle against the heavy spring.
2v19745.jpg

2v1w2a1.jpg
 
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ramhunter9

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Do you have a aftermarket one to show the difference in size ... spray holes ?
 
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Mopar1973Man

Mopar1973Man

Senior Member
Joined
Aug 22, 2011
Posts
825
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21
Location
New Meadows, Idaho
Ram Year
1996, 2002
Engine
1996 Dodge 1500 (V8-5.9L) & 2002 Dodge Ram 2500 (5.9L Cummins)
Do you have a aftermarket one to show the difference in size ... spray holes ?

Yes I do but the thing is the human eye can't see the difference... It like looking at a human hair which measures 0.0015-0.0020 inches... That would be the amount of change as you go up. Or maybe the count of holes... Like those stockers are 7 hole.

I really don't want to have to pull my RV275 back out of the engine...

Kind of dirty but a older pic of my R275 (Unmagnified) - Yes the tiny holes are there...
157kbiv.jpg

Here is a pic of my stock injectors after 180K miles...
muzkaw.jpg
 
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ramhunter9

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How you know what a human hair measures is beyond me ...lol
 
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Mopar1973Man

Mopar1973Man

Senior Member
Joined
Aug 22, 2011
Posts
825
Reaction score
21
Location
New Meadows, Idaho
Ram Year
1996, 2002
Engine
1996 Dodge 1500 (V8-5.9L) & 2002 Dodge Ram 2500 (5.9L Cummins)
Micrometer is sitting on my desk with my digital calipers too...
 
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