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Old 12-07-2016, 08:49 PM   #1
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City: Madisonville
Vessel Name: Nirvana
Vessel Model: 41' Litton
Join Date: Feb 2011
Posts: 181
Onan vibration isolation mounts

Just installed a set of rubber cones under the supports on my genny. "After" I completely finished the job I read in the specs that there is a front and rear set for the mounts. I didn't know that, all four mounts looked the same. Is there any numbers or marking on the rubber cones that I can look for to see if there's any difference. It's much to big of a job to redo if I bought all four of the same cones. Thanks.
BTW, it's a 7.5k MDJE Onan

41' Litton
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Old 12-07-2016, 10:32 PM   #2
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City: Sarasota/Ft. Lauderdale
Join Date: Apr 2014
Posts: 5,438
Ask Onan.

It may just be they sell them in pairs. Or there maybe a difference in the hardness of the rubber between the two sets.

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Old 12-08-2016, 09:34 AM   #3
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City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
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Where did you get the mounts? Did they all have the same part number?

Mounts can look the same but have different stiffness, aka durometer. Front mts vs rear mounts may have different load depending on where the CG is and mount spacing.

If all four have the same part number, no point in moving them around.

It might not make that much of a difference. If it runs fine and the nasty vibes that thing makes are not getting into the boat, mounts are "good enough".
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Old 12-08-2016, 10:58 AM   #4
City: Seaford Va on Poquoson River, VA
Vessel Name: Old Glory
Vessel Model: 1970 Egg Harbor 37 extended salon model
Join Date: Jan 2016
Posts: 2,257
Stiffer-harder mounts go under the heavier end which is the gen armature side.

They do have a differing number although you can likely squeeze them yourself and tell them apart. It would make sense a higher imprinted number means a harder rubber.

I have rebuilt 2 Onan gens, and I recall I could tell them apart by feel.
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