Oil Pump Adjustments?

[Tman240]

General question. What is the means for determining if you have adequate oil flow from the pump? What is the basis for determining adequate or inadequate flow? Obviously engine seizing is inadequate. lol Smoke is good, but how do you determine if its too much? Spark plug condition is what I'm guessing is to be the indicator.

Tom

[Technical Support]

Re: Oil Pump Adjustments?

It needs to be spun counterclockwise at 7000 rpm and the output measured. So in other words, you really can't (without specialized equipment).

[Tman240]

Re: Oil Pump Adjustments?

So in that case, its just plain old experience in viewing spark plug condition and a visual assessment of the smoke discharging from the exhaust?

[Technical Support]

Re: Oil Pump Adjustments?

No, it means if your pump is several years old, I would consider replacing or removing it. This is all covered in the tech article...

[Tman240]

Re: Oil Pump Adjustments?

Thanks. I had a read through the articles. Sounds ominous from the point of view of that its not IF the pump will fail, but WHEN.

I bought my skis used and have no idea if the pumps were replaced...I highly doubt it based on other routine maintenance I noticed went undone.

I suspect there is little to no warning and then wham, you've seized up.

I'm not a fan of pre-mix..just out of hassle sake. Can you link a post or article on pump replacement/installation procedure?

Tom

[Bill O'Neal2]

Re: Oil Pump Adjustments?

Actually, The test of the oil injector pump as stated in the Sea Doo manuals is to spin it backwards at 1500 rpm for 30 seconds.
A 587 oil pump should produce .83-1.00 ml of oil out of each port.
717 1.24-1.51 ml.
787 .71-.87 ml.
The test can be performed at 3000 rpm too if you double the output quantities.

[Tman240]

Re: Oil Pump Adjustments?

Bill,

Whats your take on pump replacement versus going premix? Second, is pump replacement fairly straight forward...for you I'm sure it is, but consider someone with average mechanical aptitude...such as the author here.

Tom

[Technical Support]

Re: Oil Pump Adjustments?

I have tested worn pumps that produce the speced amounts at the lower RPMS yet do not at wide open. That's why I only advocate the true test at 7000.

[Bill O'Neal2]

Re: Oil Pump Adjustments?

Pump replacment is fairly straightforward and not too difficult on 787 and 951 engines. A little more difficult on 587-717 engines.

Do they fail often ? No. Not unless they see alot of salt water.

I personally will not premix a recreational watercraft if I can avoid it. There are just too many advantages to oil injection.

The myth that all oil injection units fail sooner or later is just that, a myth.

Most 15 year old Sea Doo's, Kawasaki and Yamaha watercraft are still using the orginal oil pumps without suffering the failures that are so widely talked about on forums. Alot of engine failures are blamed on the oil injection, when in fact, their failure was for completely differnt reasons. Inexperenced mechanics often blame the oil injector because they do not know what really caused the failure.

[Tman240]

Re: Oil Pump Adjustments?

Thanks. Thats some good input.

[Ozzie Seadoo]

Re: Oil Pump Adjustments?

From what i have seen on the forum's, rust is the main killer of oil pumps....check valves are also a problem after a few years. You can determine if the check valves need replacing by looking at the oil lines....if they have bubbles then the check valves are shot. An oil pump should be tested frequently.

[Tman240]

Re: Oil Pump Adjustments?

With all of this talk about the oil pump and my original concern, I had a look at one of my ski's and found this crack on the bracket holding the pump cable.

Any comments?

Tom

[radiocontrolhead]

Re: Oil Pump Adjustments?

get a new bracket, maybe someone has a junk pump tey dont need. or u can weld it back up.

[Ozzie Seadoo]

Re: Oil Pump Adjustments?

Tman, that's disturbing! It looks like a clean hairline fracture...ie: At least rust is predictable!

Tech....you say to spin the pump at 7000rpm to get a true reading. Why so fast though? I mean, my 720 gets up to 6900RPM. The rotary gear ratio to the oil pump looks like it is about 1:2 (rotary valve gear : plastic oil pump gear). That effectively means that the oil pump spins at about 3500RPM at full throttle right? So why test at 7000 RPM??

Thanks for your help :emoticont

[John Kubiak]

Re: Oil Pump Adjustments?

1.)It looks like a clean hairline fracture...ie: At least rust is predictable!


2.)you say to spin the pump at 7000rpm to get a true reading. Why so fast though? I mean, my 720 gets up to 6900RPM. The rotary gear ratio to the oil pump looks like it is about 1:2 (rotary valve gear : plastic oil pump gear). That effectively means that the oil pump spins at about 3500RPM at full throttle right? So why test at 7000 RPM??Thanks for your help :emoticont

1.) That's not from rust; Fractures like that are from vibration.


2.) In your case, the oil pump does indeed turn slower, however, there are many engines that have the iol pump attached directly to the end of the crankshaft, which results in the pump sinning at full engine RPM's. Generally, if the oil pumps begin to wear, it will normally be more detectable under maximum operating conditions.