Onan Aux Issue

Rich Biebel · 10-08-2014, 09:36 PM

Oil pressure switch....

Davey Summa · 10-11-2014, 12:36 PM

I installed a new oil pressure switch. Still doing the same. I have to unplug the oil pressure switch and run the hot wire to the coil for it to start and run.

? what might be my next step?

Davey

voltdr · 10-11-2014, 01:16 PM

I would leave the jumper to the coil and put an oil pressure gauge in place of the switch to see how much oil pressure you have while its running.
Dan

Rich Biebel · 10-11-2014, 03:45 PM

Yes verify that you have oil pressure with a gauge. Onans rarely lose pressure but it is possible.

Painter · 10-11-2014, 06:34 PM

I have seen issues with lite weight/synthetic oils in stationery engines and generators. The conditions these units run in, closed compartments limited air flow, long periods of use seem to really like a heavier oil. I prefer a high quality 20w50.

Rich Biebel · 10-12-2014, 07:26 AM

Onan's Onamax oil is 15-40 and they recommend it for all their machines. It gets very thick after running for longer than it should in the newer machines. 150 hours or less is a recommended oil change interval. Older Onan's like this one had a very hd bottom end and oil pump. Pressure loss on one of those was not common and they had 30-40 lbs of oil pressure at 1800 rpm

Davey Summa · 10-12-2014, 08:29 AM

I run valvoline 10w-40 fully synthetic in it.

10-08-2014, 09:36 PM	#1
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,320 Likes: 25 Liked 557 Times in 217 Posts	Re: Onan Aux Issue Oil pressure switch.... __________________ Rich Biebel S/C 1479 Stock 147R

10-11-2014, 12:36 PM	#2
Davey Summa Member Join Date: Jun 2007 Location: Enon Valley, Pa Posts: 102 Likes: 0 Liked 1 Time in 1 Post	Re: Onan Aux Issue I installed a new oil pressure switch. Still doing the same. I have to unplug the oil pressure switch and run the hot wire to the coil for it to start and run. ? what might be my next step? Davey

10-11-2014, 01:16 PM	#3
voltdr Senior Member Join Date: Jan 2008 Location: Texas Posts: 706 Likes: 77 Liked 100 Times in 51 Posts	Re: Onan Aux Issue I would leave the jumper to the coil and put an oil pressure gauge in place of the switch to see how much oil pressure you have while its running. Dan

10-11-2014, 03:45 PM	#4
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,320 Likes: 25 Liked 557 Times in 217 Posts	Re: Onan Aux Issue Yes verify that you have oil pressure with a gauge. Onans rarely lose pressure but it is possible. __________________ Rich Biebel S/C 1479 Stock 147R

10-11-2014, 06:34 PM	#5
Painter Member Join Date: Dec 2012 Posts: 227 Likes: 4 Liked 162 Times in 45 Posts	Re: Onan Aux Issue I have seen issues with lite weight/synthetic oils in stationery engines and generators. The conditions these units run in, closed compartments limited air flow, long periods of use seem to really like a heavier oil. I prefer a high quality 20w50.

10-12-2014, 07:26 AM	#6
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,320 Likes: 25 Liked 557 Times in 217 Posts	Re: Onan Aux Issue Onan's Onamax oil is 15-40 and they recommend it for all their machines. It gets very thick after running for longer than it should in the newer machines. 150 hours or less is a recommended oil change interval. Older Onan's like this one had a very hd bottom end and oil pump. Pressure loss on one of those was not common and they had 30-40 lbs of oil pressure at 1800 rpm __________________ Rich Biebel S/C 1479 Stock 147R

10-12-2014, 08:29 AM	#7
Davey Summa Member Join Date: Jun 2007 Location: Enon Valley, Pa Posts: 102 Likes: 0 Liked 1 Time in 1 Post	Re: Onan Aux Issue I run valvoline 10w-40 fully synthetic in it.

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