OIL pump testing?

[ace422]

Doing a rebuild on my 787, waiting on the 1211 to come in so i can start building it up. Ive been contemplating what to do about the oil pump. I have the OEM pump but the Teflon shaft is broken. From reading other post lots of people go premix but the more experienced guys say to stick with the pump. I can get a new shaft but i'd like to know the pump works. The spring that keeps tension on the arm was loose, no oil lines connected and the cable coming from the carbs was also disconnected when i got the ski. P.O. was going premix. I've read posts about doing a bench test and the manual shows using a drill. Can anyone help me with a more detailed set of instruction, maybe even some pictures on how i can verify the pump is good? Or should i just go premix also.

Thanks!!

 

[Strizzo]

The test in the manual is the way to find out if it's working properly, but I havent ever seen a drill with a tach before, and my wife would skin me and eat me if i filled one of her measuring cups with oil.

 

[Djm2U]

The test in the manual is the way to find out if it's working properly, but I havent ever seen a drill with a tach before, and my wife would skin me and eat me if i filled one of her measuring cups with oil.

Thats why you clean it and put it back before she notices. :biggrinjester:

 

[ace422]

manual calls for 1500 rpm. my cordless does 1700 rpm. Just hoping someone else has had to test these out of the ski and could give some pointers.

 

[gforney]

Dude i got caught using her mirror and tweezers to get a screw i dropped in the bottom of the ski and i am still in the dog house. I thought she was in bed turns out she brought paper out to garage for recycling and i was nabbed redhanded. was NOT pretty!

 

[PGHMAN]

Ace - I just did a bench test on my pump the other night - doing a rebuild on my 98 GTX RFI. Real simple process. I first attached a small c clamp to the to the cable bracket on the pump then used my vise to hold the clamp so I could attach my cordless drill to the oil shaft. The amount of oil needed to bench test is minimal so I attached a hose to the inlet on the pump then filled with oil.
Next, run the drill - I was not sure of the RPM but I wanted to insure that the pump worked and the outlets in the rotary valve cover were not clogged. Make certain the oil pump lever is fully open I used a small screw driver to prop the lever open. While running the drill watch for oil drips on the rotary cover ports.
You may need to bleed the pump if dry. Hope this helps.

 

[RodInEscondido]

Good time to check the operation of the check valve in the banjo fitting connecting the oil pump to the small oil lines, I have found a couple of them on the older skis blocked so no oil flow, but the pump was good. These were on the older 580 engines so do not know how applicable this is here. I used a brake bleeder vacuum pump to the end of the little oil line to suck a little solvent, then a little air, but later found that all it needed was to suck thru a length of the new little oil line and insure no back flow. 3/32 tygon fuel line found at any shop servicing small engines.

Rod

 

[ace422]

Thanks PGHMAN I will give that a shot tomorrow.