Foam inside cowling ?

1992 OMC 9.9 is padding stock ?

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shawn30
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Joined: 06 Aug 2019, 14:04

Foam inside cowling ?

Post by shawn30 »

Hi everyone, working on my used 9.9 and found that some of the foam padding that lines the inside of the cowling had fallen off and was shredded by the flywheel. Doesn’t look like it was sucked into the carb or motor.

Did Johnson put foam padding in the cowling to help with noise or was this something the previous owner might have done?

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Captain Ahab
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Location: Bucks Co., PA
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Foam inside cowling ?

Post by Captain Ahab »

It is to.help with noise. Mine fell apart and i.left it out. It is louder but i live with that.


I thought about using celotex to replace it but never got to that yet lol
Trying to Fish as often as Jim works :LOL2:

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RaisedByWolves
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Joined: 07 Oct 2017, 19:26
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Location: Bucks county PA.

Foam inside cowling ?

Post by RaisedByWolves »

Mine was making fine dust that winds up in the carburetor.

I dont think it woll really hurt anything, but I sprayed the surface with spray glue to stop this.

3M #33 or #77 would work.
Sailbad the Sinner

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wmk0002
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Joined: 17 Apr 2014, 15:39
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Location: Cullman, Alabama

Foam inside cowling ?

Post by wmk0002 »

My 92 model 9.9/15 has foam but my 3 others that are 70's to mid 80's models do not have any. I honestly can't tell a difference in noise between them.
2016 Alumacraft 1648 NCS - 1992 Johnson 9.9 HP Tiller
https://www.tinboats.net/forum/viewtopi ... 21&t=40764

Newtosa
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Joined: 17 Apr 2018, 00:05
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Foam inside cowling ?

Post by Newtosa »

I landed on dynaliner. Here is where I did my research. It made a huge difference on the 1960s 18s, and I'm planning to put it inside my 1961 Lark 40hp when I get it running as well. As everyone pointed out, you'll need to confirm heat tolerance, adhesion, and just think through what would happen if it were to come unglued from your cowling. In the end, I decided it couldn't be worse than the foam that OMC used (in terms of risk of falling off)... so I tested carefully, and I'm glad I did it.

https://www.thehulltruth.com/boating-fo ... wling.html
Last edited by Newtosa on 28 Oct 2019, 12:21, edited 1 time in total.

Newtosa
Posts: 45
Joined: 17 Apr 2018, 00:05
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Foam inside cowling ?

Post by Newtosa »

I knew there was another thread as well. Here it is.

https://forums.iboats.com/forum/engine- ... of-cowling

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