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Old 07-16-2019, 05:05 PM   #1
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Default Plastic engine top cover

Is this cover supposed to have sound deadening material on it? If not, has anyone tried attaching some kind of foam or other material to reduce injector noise in the cabin?
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Old 07-16-2019, 05:08 PM   #2
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Default Re: Plastic engine top cover

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Originally Posted by rustdogbrown View Post
Is this cover supposed to have sound deadening material on it? If not, has anyone tried attaching some kind of foam or other material to reduce injector noise in the cabin?
The injector gallery cover? That has no OEM sound deadening.

I doubt that adding material would do much. I have no idea if it would have any detrimental effect.

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Old 07-16-2019, 05:19 PM   #3
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Default Re: Plastic engine top cover

There’s a little bit of black open cell foam adhered to the forward passenger side in my 2006, no idea what it’s there for but it’s doubtful that it’s for sound deadening purposes
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Old 07-16-2019, 05:26 PM   #4
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Default Re: Plastic engine top cover

The sound is from the exploding fuel, not the injector.
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Old 07-16-2019, 05:31 PM   #5
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Default Re: Plastic engine top cover

I don't think injectors make noise over 5 db, unless they have a leak from combustion chamber, then it's a 90 db chuff that can be heard inside.
Best to fix the leak around the injector than quieten it
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Old 07-16-2019, 06:01 PM   #6
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Default Re: Plastic engine top cover

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Originally Posted by ECU View Post
The sound is from the exploding fuel, not the injector.
Not to be Bobnoxious, and by all means, educate me if I'm in error but...it's my understanding "Explosion or exploding" are improper noun and verb to describe "Conflagration" process. The distinguishing differences, explosions produce shockwaves in contrast to conflagration. At least in gasoline vehicles but assume applicable to diesels as well???

I was taught, among others, why knocking and pinging are deemed harmful to gasoline engines. Knocking, the result of shockwave producing explosions??? I have no clue the genesis of the ubiquitous diesel knock, but I enjoy the manly sound, and assume it is the result of robust conflagration???

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Old 07-16-2019, 06:11 PM   #7
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Default Re: Plastic engine top cover

Whoops... sorry about the fog laden voyage. The 2015, OM651 plastic engine cover has material similar affixed to the firewall. I think, my memory is getting a bit foggy.
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Old 07-16-2019, 07:45 PM   #8
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Default Re: Plastic engine top cover

?? I always thought "knock" was far-before-top-dead-center pre-ignition of the gasoline, frequently caused by either too-high compression for "regular" fuel, or remaining bits of hot carbon crusted onto piston tops.

--dick (never had a high-compression gasoline car ... quite the opposite...)
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Old 07-16-2019, 08:45 PM   #9
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Default Re: Plastic engine top cover

I'd be impressed if you can hear injector noise in the cabin. It would most certainly be drowned out by the rest of the general running noises of a diesel engine (fans, combustion, whirring belts and pulleys, exhaust) along with general noises of a vehicle (wind noise at speed, tires rolling on rough pavement, loud stereos or exhaust of the vehicle next to you). As others have stated, I doubt you'd accomplish much by putting sound deadening material inside the black cover. There is foam in the compartment of it over the oil separator only as BrennWagon said. You'd be better off putting sound deadening material in your cabin to eliminate all the mentioned noises above rather than targeting specifically noise under the cover. A soundfile might help. Hopefully the noise you're hearing is not a symptom of something else wrong, such as bad/noisy valve train. Perhaps a test would be to drive without the cover installed. This would show you how much noise attenuation the cover alone provides (if any) to gauge if adding additional sound deadening would do anything.
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Old 07-16-2019, 11:14 PM   #10
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Default Re: Plastic engine top cover

Quote:
Originally Posted by autostaretx View Post
?? I always thought "knock" was far-before-top-dead-center pre-ignition of the gasoline, frequently caused by either too-high compression for "regular" fuel, or remaining bits of hot carbon crusted onto piston tops.

--dick (never had a high-compression gasoline car ... quite the opposite...)
Here's one explanation: is there a difference between knock and ping?

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