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Engine Sound Pad Installation
 
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Pelican Technical Article:

Engine Sound Pad Installation

Time:

2 hr

Tab:

$75

Talent:

**

Applicable Models:

Porsche 911 (1965-89)
Porsche 912 (1965-69)
Porsche 930 Turbo (1976-89)

Parts Required:

New engine compartment sound pad, 3M Super Weatherstrip Adhesive 08001

Hot Tip:

Best time to replace this pad is when the engine is out of the car.

Performance Gain:

Sharper looking engine compartment, quieter engine

Complementary Modification:

Replace rear decklid shocks
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This article is one in a series that have been released in conjunction with Wayne's book, 101 Projects for Your Porsche 911. The book contains 240 pages of full color projects detailing everything from performance mods to changing your brake pads. With more than 650+ full-color glossy photos accompanying extensive step-by-step procedures, this book is required reading in any Porsche 911 owner's collection. See The Official Book Website for more details.

It's quite common for the engine compartment sound mat to deteriorate and fall apart after many years of use. The design that Porsche used consists of a mat that is made of a sponge type material. This material often falls apart, leaving sponge remains all over the inside of the engine compartment. Replacement is easy, and made even easier with the engine out of the car.

The first step in replacing the mat is to remove the old one. In most cases, this will not be too difficult. The older mats have a tendency to easily pull away from the glue that originally held them to the rear of the engine compartment. If you don't have the engine or fuel injection removed, then this task will be a bit more difficult. Remove your air filter housing for more access before beginning. It's ok to rip the mat as you are taking it out. Just make sure that you cover the parts of your fuel injection (intakes on carburetors for example) that are open and susceptible to foam chunks falling inside.

The installation of the new mat is very straightforward. The key to the process is the 3M Super Weatherstrip Adhesive, which is by far one of the best glues ever created. Simply put, when you glue anything with this stuff, it sticks right away. Lay the mat out on the ground and then apply the glue to the back by squeezing it out of the tube. Creating a crisscross pattern on the back of the mat should work well. Make sure that you apply the cement to all of the edges of the mat so that they will stick to the rear of the engine compartment. If you are planning on replacing your rear decklid shocks (Pelican Technical Article: Replacing Hood Shocks), I would advise that you do that prior to installing the new pad.

The 3M Super Weatherstrip Adhesive is a fantastic glue, but it can be quite noxious. I recommend using a filtered gas mask when using the glue. Working in the engine compartment really doesn't aid in the ventilation process. The $30 gas masks available at most hardware stores seem to do an excellent job at filtering out the fumes from the glue, and certainly seems a low price to pay to avoid getting cancer later on.

For about 10-20 minutes after you place the new pad, keep pressing on it to make sure that it is making contact with the rear of the engine compartment. The adhesive will do the rest. After about 12 hours of final curing, the glue should be quite strong.

3M Super Weatherstrip Adhesive 08001 is one of those modern miracles of science.
Figure 1

3M Super Weatherstrip Adhesive 08001 is one of those modern miracles of science. By far one of the best glues out there, its primary advantage is the way that it requires a only a minute or two of placement before it will hold things in place. It dries incredibly quickly and is easy to use. The only drawback is its overcoming fumes, which are not very healthy to ingest.

The newly installed sound pad significantly cleans up your engine compartment.
Figure 2

The newly installed sound pad significantly cleans up your engine compartment. Make sure that while the glue is drying, you keep pressing the pad against the back wall.

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Comments and Suggestions:
JWM Comments: Where could I gather information on removing the A/C condenser blower assembly on a 1989 911?
July 25, 2016
  Followup from the Pelican Staff:
We don't currently have that tech article. If we get a chance to perform the procedure, we will be sure to document it.

I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
JWM Comments: The blower motor for my air conditioner on my 1989 911 keeps blowing fuses on the relay located next to the blower. Does the motor need to be replaced? It seems to work fine once I replace the fuse but it doesn't last long.
July 18, 2016
  Followup from the Pelican Staff: Could be a faulty blower or shorted wiring. Be sure the wiring is not shorted to ground, then replace the blower. Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Pk Comments: I have 1988 Porsche 911 Convertible 3.2ltr. I have two questions aMy exiting Engine Insulation has deteriorated and it is dropped on the engine car drives rough after it is hot Car does not move and has no power but car is on.
b How would I Install / Replace this insulation cover it is behind the engine ? Any advice will be appreciated
December 28, 2014
  Followup from the Pelican Staff: Not sure I follow. The insulation, can you share a photo?

Sounds like an engine misfire. I would check spark, fuel and compression on all cylinders. - Nick at Pelican Parts
 
Gouldie Comments: I notice the 'German' brand replacement mat is written up as being thicker than the OEM mat. I want to fit a mat that has thickness as close as possible to the original matt which is approx 18mm. Do you know thickness,s of the available replacement mats?
July 13, 2014
  Followup from the Pelican Staff: Give our parts specialists a call at 1-888-280-7799. They can help you find the right mat. - Nick at Pelican Parts  
TheSt|G Comments: '85 911.

I think I might have solved it via a parts diagram, is it inside the airbox?
April 22, 2014
  Followup from the Pelican Staff: I thought there was one in the front, then one behind the airbox, under the intake air duct. Going by memory of course. - Nick at Pelican Parts  
TheSt|G Comments: Silly question, where is the last bolt holding the airbox in place on a 3.2? I have the two fronts out and can feel the whole airbox pivoting on some rear attachment point. Thanks!
April 21, 2014
  Followup from the Pelican Staff: What year and model? - Nick at Pelican Parts  

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