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Open Roads Forum  >  Class A Motorhomes  >  Maintenance Issues & Tips

 > Onan exhaust hangers don’t last

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ford truck guy

Pennsylvania

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Posted: 08/14/20 12:27pm Link  |  Quote  |  Print  |  Notify Moderator

Chum lee wrote:

MountainAir05 wrote:

My first one last about 5 years. The replacement came from a auto parts store and its been on there 15 years. It looks like maybe a tire type laminated material. Without some flex you going to get breakage on metal to metal connectors.


Yes! There are better grades of reinforced rubber. I just found a failed tire (blowout) and cut the appropriate sized rubber strip out of the sidewall. You need a sharp knife to do that. Drilled out the rivet and drilled two holes in the rubber strip and replaced it with an appropriate sized bolt and nut Problem solved for free. It's been fine now for 7 years.

Chum lee


I like that idea Chum Lee.. easy and effective


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dougrainer

Carrolton, Texas

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Posted: 08/14/20 01:37pm Link  |  Quote  |  Print  |  Notify Moderator

Hangers usually FAIL because they are NOT installed correctly. Exhaust hangers just support the tail Pipe. If, when you install you are putting a load on the hanger, the Rubber will fail. AFTERMARKET Hangers (Auto supply stores) are much better grade. Sometimes, you may need 2 depending on how long the Tail Pipe is. Doug

camperdave

northern, California

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Posted: 08/14/20 02:14pm Link  |  Quote  |  Print  |  Notify Moderator

Mine broke last year, I replaced it with something that looked close enough that I found at the local auto parts store.

In my case, the end of the Onan exhaust pipe went through a metal hoop that was screwed onto the bottom of the motorhome. When the support broke, the pipe sprung a bit was now firmly pressed against the hoop. Obviously the rubber support had been under a lot of stress for many years. I removed the hoop, let the pipe self settle where it wanted to be naturally, then mounted the new hanger in a stress free manner. I don't expect it to ever break again.


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Chum lee

Albuquerque, NM

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Posted: 08/14/20 09:04pm Link  |  Quote  |  Print  |  Notify Moderator

ford truck guy wrote:

Chum lee wrote:

MountainAir05 wrote:

My first one last about 5 years. The replacement came from a auto parts store and its been on there 15 years. It looks like maybe a tire type laminated material. Without some flex you going to get breakage on metal to metal connectors.


Yes! There are better grades of reinforced rubber. I just found a failed tire (blowout) and cut the appropriate sized rubber strip out of the sidewall. You need a sharp knife to do that. Drilled out the rivet and drilled two holes in the rubber strip and replaced it with an appropriate sized bolt and nut Problem solved for free. It's been fine now for 7 years.

Chum lee


I like that idea Chum Lee.. easy and effective


Thank you. It's my lifes work.

ezgoin

Sunny Arizona

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Posted: 08/17/20 11:26am Link  |  Quote  |  Print  |  Notify Moderator

dougrainer wrote:

Hangers usually FAIL because they are NOT installed correctly. If, when you install you are putting a load on the hanger, the Rubber will fail. AFTERMARKET Hangers (Auto supply stores) are much better grade. Sometimes, you may need 2 depending on how long the Tail Pipe is. Doug


Isn’t the intent of the hangers to support the weight of the genny exhaust? I currently have 2 completely broken, with another one attached near the engine exhaust that is ready to break.

Bill


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Chum lee

Albuquerque, NM

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Posted: 08/18/20 05:37pm Link  |  Quote  |  Print  |  Notify Moderator

ezgoin wrote:

dougrainer wrote:

Hangers usually FAIL because they are NOT installed correctly. If, when you install you are putting a load on the hanger, the Rubber will fail. AFTERMARKET Hangers (Auto supply stores) are much better grade. Sometimes, you may need 2 depending on how long the Tail Pipe is. Doug


Isn’t the intent of the hangers to support the weight of the genny exhaust? I currently have 2 completely broken, with another one attached near the engine exhaust that is ready to break.

Bill


Watch the genny when it operates. Just like the main engine, it bounces around quite a bit. You need to have the flexible mounts on the exhaust system absorb that flex while supporting the weight. Then there's the expansion/contraction due to the thermal cycles too.

Chum lee

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