Priming the oil pump

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Captain Ron
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Priming the oil pump

Postby Captain Ron » Mon Oct 10, 2016 11:26 pm

Basically, how do I prime the oil pump and why do I need to? This engine has not been run in several years.

Thanks!
Ron

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Glen
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Re: Priming the oil pump

Postby Glen » Tue Oct 11, 2016 1:10 am

Hi,
If the engine hasn't been run in several years, you should prime the oil pump, they sometimes lose their prime and won't suck the oil up from the oil pan. Then there is no oil pressure when the engine is running.
Here is a picture of where the hole is that I use for priming the oil pump. Just remove the oil filter top, and oil filter, and it is easy to see, use a light if you need to.
I fill a clean oil can with motor oil, and pump it into the hole, you might need more than one filling of the oil can to fill the passages in the engine.
Watch the oil gauge after starting, it takes 15 - 30 seconds for the gauge to show pressure, it has to fill the oil filter housing before the gauge will show pressure.
If you don't want to prime it, you don't have to, I would watch the gauge and be sure it has pressure in 30 seconds after it starts, if there is no pressure, it needs priming. :)
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Cub oil filter.jpg

Captain Ron
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Re: Priming the oil pump

Postby Captain Ron » Tue Oct 11, 2016 8:06 am

Thank you, Glen. Very helpful!

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Re: Priming the oil pump

Postby Cubfriend » Tue Oct 11, 2016 8:36 am

I would strongly advise priming the oil pump if it has been setting a long time. If not primed you run the risk of doing damage to the bearings and crank, cam and everything else that relies on oil for lubrication.
Frank

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Re: Priming the oil pump

Postby Eugene » Tue Oct 11, 2016 9:43 am

Prime the oil pump. Put a cup or two of engine oil into the opening. This will also put oil into the oil galleries.

Leave the oil filter cover off. Crank over the engine with ignition off. Keep an eye on the opening in the oil filter housing. When oil is being pumped into the oil filter housing, the galleries are full of oil and oil is being supplied to the crankshaft bearings.

Install the oil filter and oil filter housing cap. Start the engine.

Edit: P-mail from Don. Monitor the oil pressure gauge. My addition to Don's P-mail, check the oil filter cap for leaks after the oil comes up to pressure.
I have an excuse. CRS.


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