Topic: Oil Pump

[M_Stone76?]

Hello, not sure if this is the right fourm to ask this question

been doing some winter maintaince on my 76' K and decided to pull/rebuild the oil pump.

so far everything has gone great, the only concern i have is priming it. i know of the old trick packing the pump w vasaline to prevent cavitation and create a vacuum.
but what i don't know is what part of the pump i have to pack. so far ive packed every gallery except for the leak stopper valve.

too much?

when i am ready to put the pump back into the bike, do i still have to prime it with oil, submerged? or can i slap it back on full of Vaseline and hopefully the oil will push its way through.

thanks.

[BenelliSEI]

Dip it in oil, install it, pull your plugs and spin it until your oil warning light goes out. It will be fine after that.

[HondaMan]

I submerge them in 20w50 oil to halfway up the pump body and spin the gear (in the same direction as the crankshaft runs) until the bubbles stop coming out of the ports. Then I pick up the thing, dribble oil across the floor to the engine, crawl under the engine so I can get the oil in my eyes, then bolt the pump in, still upright. Then I turn the engine upside down and install the oil pan and go wash my face.

...it's almost always like that...

[Floshenbarnical]

I submerge them in 20w50 oil to halfway up the pump body and spin the gear (in the same direction as the crankshaft runs) until the bubbles stop coming out of the ports. Then I pick up the thing, dribble oil across the floor to the engine, crawl under the engine so I can get the oil in my eyes, then bolt the pump in, still upright. Then I turn the engine upside down and install the oil pan and go wash my face.

...it's almost always like that...

This is my favorite post on the forum but can I send you a pair of goggles mate

[HondaMan]

I submerge them in 20w50 oil to halfway up the pump body and spin the gear (in the same direction as the crankshaft runs) until the bubbles stop coming out of the ports. Then I pick up the thing, dribble oil across the floor to the engine, crawl under the engine so I can get the oil in my eyes, then bolt the pump in, still upright. Then I turn the engine upside down and install the oil pan and go wash my face.

...it's almost always like that...

This is my favorite post on the forum but can I send you a pair of goggles mate

Thanks for the offer, but they are too hard to clean oil off of. They're always so 'streaky' afterwards, ya know? 

[Honda Hansel]

Hi
Priming the oil
This is how I do all my priming of motor cycle and car engine
I use a oil accumulator
Mine happens to be a Moroso race style accumulator
Pressure it up with shop air and pump the oil in and that's is easy as taking candy from kid's

Honda Hansel
 

[newday777]

You posted this somewhere else recently. 🤔

[Honda Hansel]

You posted this somewhere else recently. 🤔

Yes I did Stu
I posted it on my Resto thread
 
This works real good when engine oil pump is dry
when I read the Honda shop manual and figured out how the pump works
I will never start a dry engine

Honda Hansel

[newday777]

Hi
Priming the oil
This is how I do all my priming of motor cycle and car engine
I use a oil accumulator
Mine happens to be a Moroso race style accumulator
Pressure it up with shop air and pump the oil in and that's is easy as taking candy from kid's

Honda Hansel

How do you get the oil into the accumulator?

[Honda Hansel]

The out let has a 1/2" pipe ball valve
I use a funnel to fill the accumulator
Push the piston back with air and fill
It will hols 3L of oil

H Hansel

[newday777]

The out let has a 1/2" pipe ball valve
I use a funnel to fill the accumulator
Push the piston back with air and fill
It will hols 3L of oil

H Hansel

Thanks. I don't know if I'll get an accumulator at the tune of $300+........

[HondaMan]

The out let has a 1/2" pipe ball valve
I use a funnel to fill the accumulator
Push the piston back with air and fill
It will hols 3L of oil

H Hansel

Thanks. I don't know if I'll get an accumulator at the tune of $300+........

You could always turn that 750 on it's left side and get a little funnel, then pour the main journal full, it would eventually fill in the oil filter, too...

[Gamma]

Dip it in oil, install it, pull your plugs and spin it until your oil warning light goes out. It will be fine after that.

👍

[Don R]

 I've used a gauge adapter a 90* elbow and some pipe fittings to make a standpipe, fill it with oil and let gravity prime it, I've also used an air conditioning compressor oil fill tank, it's similar to the accumulator. 

[willbird]

I wondered about somehow pushing oil into that oil gallery to prime an empty pump, good to know that it does work.

Bill

[Floshenbarnical]

I think I'll stick to dripping oil all over my floor and face the Hondaman way.

[BenelliSEI]

I think I'll stick to dripping oil all over my floor and face the Hondaman way.

Good plan.

[willbird]

I think I'll stick to dripping oil all over my floor and face the Hondaman way.

Good plan.

I am not afraid to try something new :-). Perfect time to try it might be while the oil pan is still off ? On my to do list is drop the pan on my K3 and have a look at the pump. I have a spare pump I got from Ebay.

Bill

[HondaMan]

I think I'll stick to dripping oil all over my floor and face the Hondaman way.

I've found i like the taste of the Bel-Ray oils better than the synthetics.

[newday777]

I think I'll stick to dripping oil all over my floor and face the Hondaman way.

I've found i like the taste of the Bel-Ray oils better than the synthetics.

😎

[M_Stone76?]

Thanks all for the replies , the oil pump is rebuilt and doin a-ok 👌
Only concern is that before I rebuilt it I was getting around 65-70 psi.
Now, I am getting most 60-63 cold.
I’m guessing this means maybe the rotors are worn past their spec? I did not change anything so it doesn’t make a lot of sence, all bolts, rubber, springs etc are new .
The oil stopper valve prevents oil from draining, but doesn’t it prevent too much oil pressure aswell ?

[willbird]

Thanks all for the replies , the oil pump is rebuilt and doin a-ok 👌
Only concern is that before I rebuilt it I was getting around 65-70 psi.
Now, I am getting most 60-63 cold.
I’m guessing this means maybe the rotors are worn past their spec? I did not change anything so it doesn’t make a lot of sence, all bolts, rubber, springs etc are new .
The oil stopper valve prevents oil from draining, but doesn’t it prevent too much oil pressure aswell ?

Pressure relief or pressure control valve is what determines maximum oil pressure..same valve but different folks use different terms. Some of the springs in some kits avail now will coil bind without ever letting the valve open.


Bill

[M_Stone76?]

But overall it’s pretty normal ?
I’m guessing the spring is not letting a lot of pressure through ?

[willbird]

But overall it’s pretty normal ?
I’m guessing the spring is not letting a lot of pressure through ?

The pressure control valve (as I was taught is the correct term) allows some of the fixed volume of fluid to return to the sump in order to control pressure. So a pressure that is lower than desired with the same pump, engine, and oil type/weight would lead me to think that the new spring is weaker. The spring lets some volume OUT.
Bill

[HondaMan]

Did you replace that #@$! shaft seal in between the 2 chambers? If not, the pressure comes out low, and lower when hot.
If your new seal on the pressure relief valve is too tight the pressure goes high, vice-versa if the new spring was not the right calibration - which I have often found in the "kits" sold to rebuild these pumps. I use the old spring, and if the pressure is still lower than 60 PSI at idle engine speed, have added thin shims under that spring to raise the bypass pressure a bit - but, this also involves dribbling more oil...