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Old 04-08-2004, 10:22 PM
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Join Date: Jun 2001
Location: Denver, Colorado
Posts: 127
300D injectors...on the job

well i'm changing out my injectors on my 78 300D. i had removed all 5 injectors and was inspecting the holes where these guys sit in. i had removed the heat shields inside of the injector housing just to clean up all of the carbon gunk that had been building up in those holes. i found something very interesting. facing the engine head on...injectors 1-4 have the same hole opening inside of the injector housing. however the 5 injector housing has a significantly larger one. i'm assuming that the standard size opening for these injectors is 7.5mm but i think that since injector 5 is significantly larger in size...i'd suspect that its a 10.00mm opening.

if i just let this go and install a heat shield over this 10.00mm when in fact my heat shield openings are at standard 7.5mm...will this affect performance of the car significantly or am i just be too conscious about what i'm doing...


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Old 04-09-2004, 04:23 PM
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Join Date: Jun 2001
Location: Denver, Colorado
Posts: 127
anyone want to elaborate on this...

thanks for all replies..
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Old 04-09-2004, 11:40 PM
79-240d-project's Avatar
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Join Date: Oct 2003
Location: Pacific Northwest, Washington State
Posts: 253
Was wondering how this turned out. My new injectors came with new heat shields. The opening size was the same as the old, however the design was a bit different.

Did you just install the new heat shields that the injectors came with?
79 240D (no name yet) 203K Miles Maple Yellow
98 2500 4x4 HD Dodge 24 Valve Cummins TD
83 Chevy Van (Dead-Trans. shot)
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Old 04-10-2004, 01:13 AM
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Join Date: Jun 2001
Location: Denver, Colorado
Posts: 127
i just installed the heat shield over the larger opening. everything seems to work fine i guess. I'm noticing a lot more quieter ride at about 50-75mph...engines doesnt sound as loud as it used to was really smoking right when i tried to fire up the 300D. it took me about a good 15 seconds to constantly crank up the engine to speed so that it can go on its own...gosh i hope i didnt retard the life of my starter.....but the smoke went away as i drove it for about a good 50 miles that nigh.

anyhow, not really much performance gain but little less smoke now on the freeways while pushing it hard to the floor, easier cold, cold startings, and less engine noise round 50-75mph. I guess i can say it was worth the 300.00 dollar investment.
I'm hoping for more mileage for sure however..

next job is to learn how to do valve adjustments...i need those wrenches


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