Re: Onan MDKAV vented loop


Thanks Bill,

I have been told by three mechanics and two surveyors that:

1. The vented loop should be vertical not horizontal.

2. The way the vented loop is plumbed into the exhaust hose is not a good idea.

All five said the way it is set up can potentially lead to problems with water working its way back to the engine causing mechanical problems or worse.

We just spent a few days cleaning out the exhaust elbow, exhaust manifold and replacing a two valves, (that prevented the Kubota from working). It looked like there was slight water or moisture causing corrosion in the area of the valves. The mechanic who was helping me said he believed the current vented loop set up is most likely what caused the issue. We now have the generator working again, but I have been strongly advised to modify the current vented loop system.

1. Change the vented loop so it is vertical, (not horizontal).

2. Remove the drain of vented loop from where it is now, (plumbed into the Onan wet exhaust hose), and move it to a place like or even beside the one for the main engine.

With the upmost respect to the designers of my Amel,  I am wondering if there have been any problems on other Amels with the way the original vented loop system has been set up on their Onan-Kubota gen-sets ?

Has anyone changed or modified the vented loop coming of the the Onan-Kubota gen-set ?

Thank you for your time.

SM - 444
Comox, BC, Canada

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