I think I miss my steel hood: John Deere Review  -- John Deere Tractors Discussion Forum and Review I think I miss my steel hood: John Deere Review -- John Deere Tractors Discussion Forum

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 08-11-2003, 09:53 Post: 61517
DRankin



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 I think I miss my steel hood

My new 4115 is LOUD. On the verge of painfully loud.

I could start and run my 4100 for short periods of time without any problems and only had to wear hearing protection for extended operation at higher RPM's.

It is clear that that ain't working with the new tractor. Just standing next to it when it idles makes my ears ring.

The only significant difference between the two is that the 4100 had a steel hood and the 4115 has a plastic hood.

I don't think the increased racket is coming from the change in horsepower (20 vs. 24) or the direct vs. indirect method of fuel injection. The mufflers appear to be the identical and are routed the same way.

Is it possible that polymer hood could increase the sound levels that much?

I am going to do some experiments with sound deadening materials to see if I can tone it down to a more comfortable level.






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 08-11-2003, 10:01 Post: 61521
Art White



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 I think I miss my steel hood

Sorry to hear that Mark! Well maybe, the plactic should be the quieter of the two by far. I won't go any further at this point other than to say to look for something loose and some adjustments to the hood to tighten it up.






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 08-11-2003, 10:04 Post: 61524
kwschumm



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 I think I miss my steel hood

I think the only thing that deadens sound is mass, but my (often wrong) intuition is that it shouldn't make much difference. Sound travels through air and it's not like the hood has an airtight seal. It would be interesting to pop the hood on your 4115 and measure the sound level with a sound level meter, then do the same with the 4100.






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 08-11-2003, 10:07 Post: 61527
kwschumm



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 I think I miss my steel hood

By the way, if you're interested in doing that test I'd be happy to send you my trusty Radio Shack sound level meter for a week or two to experiment with.






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 08-11-2003, 10:14 Post: 61531
DRankin



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 I think I miss my steel hood

Art, I have driven two 4115's and both sounded the same. The first one had a fiberglass canopy and I chaulked up the extra noise to that.

I have looked for loose manifolds and such but everything looks tight and ship-shape there.

The sound has a hard edge to it like you would expect if the muffler was a totally empty steel shell.






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 08-11-2003, 10:17 Post: 61532
DRankin



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 I think I miss my steel hood

Ken, thanks for the offer. The 4100 is gone so I don't have anything to compare it with...... but if I can figure out another way of comparing I will certainly give you a holler. A quiet and subdued holler.






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 08-11-2003, 10:56 Post: 61539
Chief



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 I think I miss my steel hood

Mark, I am not sure if this will help make a noticable difference but I too noticed the load sound of the 4410 engine (the loudness of the ignition knock). I tried adding some Power Servic fuel additive in the silver bottle in proportions enough to raise the cetane rating 6 points according to the instructions. Maybe it is all in my head and wishful thinking but I noticed a good drop in the loudness and severeity of the ignition knock. I looked up what John Deere states as the preferred fuel and they specified 50 cetane #2 diesel. Europe is the only place I know where that is sold. We are lucky if we get 40 - 45 cetane fuel. If you haven't already, you may want to try it and see if it makes a difference. I found a fuel additive dealer in Ft. Wayne, IN that sells a good fuel additive for $40 for a 5 gal. pail but the shipping brings it to $95. Even at $95, it is a little cheaper than the Power Service at Walmart. I have not tried it yet but alot of guys over on turbo diesel register use it and like it. I may order a pail after I have used up the additive I have on hand. It would be interesting to see if it does make a difference for you. Your hearing must be alot better than mine. After 21 years of being around helicopter and flight line equipment, I am sure my hearing is not what it used to be.






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 08-11-2003, 11:32 Post: 61543
Art White



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 I think I miss my steel hood

Mark, is it an injection knock like what Chief is refering to? If so there are plenty of additives to help it clear other then getting into pump timing. Could this be listed as a high cost of ownership?






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 08-11-2003, 11:55 Post: 61549
boatman



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 I think I miss my steel hood

I believe that the Direct Injected engines have a distinct exhaust sound (bark) as compared to the Indirect Injected engines. A very impressive sound actually,but I can understand that prolonged exposure could be tiresome. If the hood does not have any insulation on the underside - you could probably add some and should make a noticeable difference.






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 08-11-2003, 12:04 Post: 61550
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 I think I miss my steel hood

I wondered if going from an indirect to a direct injection was part of this.

It is like a sharp knock or bark, not the mellow chortling I was getting from the 4100.

I have already tried the fuel additive route, but only at minimal levels. Maybe a higher concentration to up the cetane levels will help.

Also noteworthy is the fact that there is only six hours on the engine. Nowhere near broken-in.






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Discussion Boards > Active Subjects > Messages as Posted > John Deere Review Forum

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