By September 20, 2017 No Comments

When Trelleborg AVS was contacted by the Family Motor Coach Association (FMCA) to look into motorhome chassis mounts that were causing engine damage and vibration, we investigated our archives to offer a solution.


Recreational vehicles (RVs), motorhomes and campervans are enjoyed by enthusiasts the world over. The RV lifestyle of packing up and taking your life on the road is a retirement aspiration of many and so the trade in used vehicles of a certain engineering vintage is big business.

With this motorhome way of living comes freedom, adventure and exploration, but also a duty to maintain and manage engines which may no longer be supported by the original manufacturer.


Seeking automotive engineering support

The unusual application proved to be an excellent opportunity for Trelleborg AVS to exploit its broad product portfolio, Head of Materials, Bill Mortel and Principal Engineer, Mark Thompson, were keen to find a solution when they received a query from the FCMA’s US Technical Advisory Committee.

With a body of more than 425,000 members, the FMCA is an international organisation for families who own and enjoy the recreational use of motorhomes. Since its foundation in 1963, it has become a leading information source covering all areas of motorhome ownership and travel.


Identifying the issue

The issue in question was with Metalastik engine mounts on a 2003 model motorhome from a leading manufacturer. The FMCA Chairman came to Trelleborg AVS looking for recommendations for a stiffer rear engine mount that would give out less movement at the elbow off the turbo, yet not cause excessive vibration in the motorhome.

There was a very tight tolerance of less than 1 inch above and below the elbow off the compressor side of the turbo. Investigations revealed that the elbow was well outboard of the centerline of the engine, and there was enough flex in the OE engine to cause the aluminium elbow to make contact with the roof of the engine room. This led to the destruction of the elbow and turbo compressor housing. The FCMA had received reports that there were a number of chassis’ with the same issue and wanted to find a resolution for its members to prevent further reoccurrence.


Expert analysis of engineering archives

Despite records for the exact make and model not being available, Principal Engineer Mark Thompson was able to find comparable archived analysis dating back to 2002 from similar RV and bus testing. Based on the given criteria, three specific analyses were found that had roughly the same overall mass. Weighing up all the alternatives, the Cushyfloat 17/1657 in 65 Durometer was identified as the best option to resolve the issue in the future.


Why did the FMCA come to us?

With over 100 years of experience as Metalastik and Novibra, today Trelleborg AVS prides itself on making improvements that people can physically feel. From smoother travel to quieter and more efficient machines, we make life feel better. With quality, testing and compliance built in, we’re in it for the long haul, ensuring your solution still works, over an extended and often arduous life-cycle.

Working with FMCA to find a solution really demonstrates our commitment to accept a challenge and find a solution. True to our words “Whatever your challenge, whatever your role and wherever you are, we are nearby to offer expert knowledge and quality solutions.”

If you want to work with Trelleborg to implement engineering improvements that make your people and customers feel better, contact us at



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