Hi everyone!

I've been working on replacing my rear motor mounts for some time because the threads were in pretty bad shape on the vertical studs on all four.

I eventually had the studs replaced and am very happy with how they turned out, but to complete the job, I need to replace the Vibration Dampeners. These little guys are impossible to find locally, but thanks to Jim Wick, I have sourced them through Harpur's Marine in LA.

Before shipping them in though, I have been checking out every source available to me to buy locally and at the local boat show last week, I ran across an outfit that suggested that I make the dampeners out of polyurethane. I have absolutely no experience with this product in this type of application so hence my questions to the group.

Have any of you, had experience with polyurethane vibration dampeners without the benefit of the steel sleeves/cages to protect the polyurethane?

I have attached a couple of pictures to try and illustrate my question.

In my rear mounts that fit on my Borg Warners, there are two vibration dampeners with a spacer between them. (See photo tagged Motor Mount_7)

The company that I discussed this with suggested that I replace the two dampeners with one solid piece of polyurethane. I lathed a piece of wood this morning to simulate what he suggested. (See photo tagged Motor Mount_4)

I have resigned myself to stop exploring this and order the new ones from Harpur's if this polyurethane is not a suitable replacement. The supplier suggested a 90 Weight Polyurethane, but again, I have no idea what that means or what scale it is measured on.

Thanks for your time and I hope the photos are attached.

Steve Burt      

East Petpeswick, Nova Scotia

31’ Sport Express

Lucky Max” FSA-31-5023-H

Views: 274


Reply to This

Replies to This Discussion

I'm probably sticking with original if Harpurs has them for only one reason!  These will affect your shaft alignment as well. and personally by the time you make these up and get them just right how much have you saved. ( Your time is worth something)  But it's just my opinion.   Lee Dahlen, Glassic Boatworks  Twitter: @LeeDahlen  and @Glassicboatwks

I agree with Lee. I think the main purpose of those steel "cages" are to encapsulate the dampeners, provide a solid surface for the stud to clamp upon, and most importantly, prevent lateral movement of the engine. You lose most of this with what you suggest. Kudos for even thinking of this fix, but IMHO the risk far outweighs the gain.

I absolutely agree gentlemen! I'm placing the order with Mr. Harpur as I write this. Thanks

Reply to Discussion


Club News



6th Annual CCCC Photo Contest Winners

1st Place: Mark Struebing, Michigan USA       Model:  1969 35 Sports Cruiser

2nd Place:   Kristian & Jacqueline, Illinois, US             Model:  1967 27' Commander Custom

3rd place:  Dawn Stone, Michigan, US                     Model:  1970 55' Commander


SuperDisc 15.0 Morland Commemorative Edition and Resource Collection 6.0 Available Now!

SuperDisc 15.0 is an electronic encyclopedia of every aspect of Commander maintenance and repairs. The information on the disk is retrieved from the discussion forum and e-mail list, but organized in a way that makes information easy to find and use. SuperDisc is available on USB flash drive.  The Morland Commorative Edition is Superdisc 15.0 with the addition of the Spring 2020 Dick Morland Memorial Issue of STYLED IN FIBERGLASS. This is the last superdisc in its present format. 

Click here for more details https://commanderclub.com/page/superdisk

The SuperDisc 15.0 Complete Edition is for first time buyers of SuperDiscs.

The SuperDisc 15.0 Morland Commorative  Upgrade Edition is intended for those who wish to upgrade their SuperDisc 1.0 through 14.0. Each year we add over 1,000 posts. Don’t miss out.

Resource Collection 6.0 is great to own too!!!

The Resource Collection 6.0 contents include CC Catalogs and Brochures. CC Service Bulletins, CC Price Lists. Engine & Transmission Manuals. Dick Avery sketches and drawings, a folder for every Commander model, and all kinds of technical and interesting stuff as well as archived posts for 2019 and 2020. Over 193 folders and 2,823 Files. A true “Treasure Trove” for the Commander owner!

We thank you for supporting the club with your purchase of SuperDisc15.0 Morland Commemorative Edition  and/or Resource Collection 6.0. We hope you find it to be the value we feel it is, and trust you will enjoy the other benefits your payment will help provide. It’s your payment that helps to support the activities of this dues free organization that has grown from 12 members in 1999 to well over 4930 members in January 2021.

To order now click here!



© 2021   Created by CCCC Webmaster.   Powered by

Badges  |  Report an Issue  |  Terms of Service