Why is it so loud - Diesel Forum - TheDieselStop.com
6.9L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 6.9 Liter In-Direct Injection Navistar engines.

 
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post #1 of 9 (permalink) Old 02-02-2009, 11:15 AM Thread Starter
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Why is it so loud

We all know how loud our diesels are under the hood. What I was wondering
is exactly what component under the hood is making all the noise? Is it the injector pump, valve train or what? And knowing what it is, how can I quiet this beast a little. Its not comming from the exhaust just under the hood.

Jason Eschete 86 F-250 6.9L 180K miles
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post #2 of 9 (permalink) Old 02-02-2009, 12:04 PM
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Most of the noise is the compression knock of a diesel.......

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post #3 of 9 (permalink) Old 02-02-2009, 03:23 PM
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Synthetic oil quiets them down quite a bit.

-Justin

1984 F250 6.9 C6 2WD Push Button Glow plugs, No Soup bowl. Wix 33439 Water Separator, Carter P4594 fuel pump, Custom 3" Exhaust, NTZ Oil Bypass Filter, VDO Vision water temp gauge, ISSPRO EV Pyro

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post #4 of 9 (permalink) Old 02-03-2009, 03:38 PM
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Lucas Engine Stop Leak Or Oil Stabilizer Will Quiet It Down.

2003 F-250 6.0 74000miles Reg Cab 2wd.
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post #5 of 9 (permalink) Old 02-03-2009, 05:14 PM
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Do you still have the insulation attached under the hood. If not maybe some hush mat glued in its place might help.

Jack
97 F250 XLT CCSB 4x4, Dana 60 swap, custom built E4od, Baby swamps, 1.0 turbo housing, deleted ebpv, 203* t-stat, high pressure X line, Diy 140v Idm, 6.0 fan, Diy 6637, tunes by Dp tuners, Isspro Ev gauges, Diy intercooled, 3" downpipe 4" exhaust, 6" lift, 4:10 gears, 35" tires, 315,000 miles
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post #6 of 9 (permalink) Old 02-08-2009, 01:45 PM
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Mine used to be really loud until I had the IP timed.
It was to far advanced and now it's way quieter, smoother running. When it's warmed up anyway

1986 F250,Regular cab,XL,4X4,6.9, 4 speed,
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post #7 of 9 (permalink) Old 02-14-2009, 01:12 AM
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I've always been told its a mix between the high compression combustion of diesel and the injector pump/mechanical injectors.

1987 F250 XLT Lariat
Regular Cab 2x4 6.9L 5-Speed

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RUNS ON PURE WASTE MOTOR OIL!
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post #8 of 9 (permalink) Old 02-14-2009, 11:59 AM Thread Starter
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Thanks for the info everyone. Right now she is in a few pieces but should have her back together in a few weeks. I'm painting the accessories under the hood so I cant crank her up yet. I will try the synthetic oil and lucas engine stop leak. I added a hood insulator mat but didn't run her yet. Also how do I check the timing on her I have an old timing light but I never used it. I was also wondering If I should remove the exhaust manifold and clean it out. I work on Detroit diesels at my job and I had one's exhaust manifold caked with 1/4 inch of crud

Jason Eschete 86 F-250 6.9L 180K miles
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post #9 of 9 (permalink) Old 02-14-2009, 12:20 PM
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You need the feret adapter to use a timing light. There should be no reason to clean out the exhaust manifolds on this as opposed to a detroit especially a two cycle that has spent to much time idling.

Jack
97 F250 XLT CCSB 4x4, Dana 60 swap, custom built E4od, Baby swamps, 1.0 turbo housing, deleted ebpv, 203* t-stat, high pressure X line, Diy 140v Idm, 6.0 fan, Diy 6637, tunes by Dp tuners, Isspro Ev gauges, Diy intercooled, 3" downpipe 4" exhaust, 6" lift, 4:10 gears, 35" tires, 315,000 miles
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