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Old 05-21-2015, 12:12 AM   #11
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I've also been adding outboard oil to the fuel tank. It seems to make the engine less "rattley" and adds some lubrication back to the low sulfur diesel fuel. I got a small bump in fuel mileage to boot.

Carpet on floor and walls does help quite a bit but I agree there's only so much you can do to quiet the noisy engine.
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Old 05-21-2015, 01:05 AM   #12
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Crazy cal- you are recommending outboard oil to quiet a diesel??? Can you explain that?

I don't want my answer to sound short. I'm not going to tell you to put something in your engine that's not a normal additive for a diesel engine. I use it and have for a long time. Most diesel engines on this site were built before sulfur was removed from diesel. It was used as a lubricant.
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Old 05-21-2015, 05:54 AM   #13
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There's some interesting info here on 2 cycle oil in a diesel. Particularly extreme cold starts ( <-30 F) with just a 128:1 ratio
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Old 05-21-2015, 09:41 AM   #14
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Good writeup.
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Old 05-21-2015, 10:35 AM   #15
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Good writeup.
LOL, I just watched your youtube link.
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Old 05-21-2015, 11:26 AM   #16
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Crazycal- i understand not recommending anything here. Sulphur, high temp lubricant, old buses... gotcha!
I agree with you crazycal re scooternj's link - excellent write-up x2
Thanks all for the links!

For anyone that assumes 2 stroke oil is useful for all diesel engines and injection pumps, scooternj's link list a few that you should NEVER consider doing this with and why.
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Old 05-21-2015, 12:03 PM   #17
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Exhaust leaks will add to the engine noise as well. With the 7.3l (assuming it's a powerstroke with a turbo) check around the up-pipes and turbo for black soot. Soot means there's a leak. Leaks mean noise.
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Old 05-21-2015, 01:34 PM   #18
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I just replace all 8 of my fuel injectors and it made a noticeable difference in lowering the noise, also I sprayed rocker guard on the inside of the fire wall, and put carpet on it, also covering the stair case well cuts down big time on road noise.
Wife and I can hold a conversation with a normal voice (pros and cons to that), my brother inlaw is a trucker and the insulate the inside of the hoods, but i think that would create a over heat problem with the 7.3s
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Old 05-21-2015, 01:53 PM   #19
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Exhaust leaks will add to the engine noise as well. With the 7.3l (assuming it's a powerstroke with a turbo) check around the up-pipes and turbo for black soot. Soot means there's a leak. Leaks mean noise.

On the list for the Excursion.
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Old 05-31-2015, 06:23 PM   #20
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thanks for the tip!


i added a gallon of wally 2-stroke to the last tank and it quieted down nicely.

the cab noise was lowered enough to to hold a conversation without yelling.

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