Open discussion thread on the 4 strokes oil pump.

I have no known issues with my '07 450 but lately I've been wondering how best to detemine the oil pumps performance.

Unless I overlooked something the service manual say little about the pump, and no test for it.

Someone must have created an easy test, like fitting a pressure guage somewhere...the blue top-end lube hose?? What kind of pressure values would be expected?

Heck, even a little discussion on how it functions would be great. What are the two oil screens doing? Is the pump a dual rotor? Feeding oil thru one filter? Which goes where from there?

Is the Husky motor a wet or dry sump? Anything in the transmission force fed oil or is it only "splash" lubed?


Even a basic lubrication flow chart would be very helpful.

Just wondering...nice to know.

Dave

I'd like the same info.

Yup, it's stuff that every owner should know, I think.

Another thought.... oil volumn. The 450 holds 1700ml. and that's a pretty good amount. I wonder how much a Suzuki DRZ400 holds, as it somehow uses the front frame tube as either a oil resevoir or maybe it's for extra cooling of the oil....dunno.

How's that work?

Dave

Would be good to know for sure. I remember someone explaining to me that those engines are a dry sump design, however the sump is still located in the engine, but not in a typical crankcase location? I, too, remember my old DR250 having a dipstick up near the steering head on the frame. Seemed pretty neat.

I don't want to muddy the waters with unsubstanciated info but here goes anyweay.

The last time I changed the oil I was looking into the cavities where the screens came out of. The rear screen...bigger... is in an area that the oil drain plugs. (You can see the drain hole from the screens hole.) The two screens are so close together you'd think you could see one from the others hole. Not true. There's a wall between, I thinks. But, seeing how the drain plug does all the draining there's probably a hole in that "wall" for the draining oil to pass.

Here's where I start speculating.

The front screen, maybe, is feeding one of two rotors in the oil pump. It's scavaging oil from the crank area, (that's the "dry sump" concept), and feeding it back to the "other side of the wall" area. And so then the rear screen takes oil laying in the tranny area, plus the "pumped over" crank oil and filters it for both the crank/head lube needs and maybe bit is sqwerted over to the clutch and tranny parts too.
So long as all is ok ...oil level and all, there's always enough oil in the big screen area to supply the entire engines needs.

I might be totally wrong.

Be nice to know.

dave

Specifically, how does the cranks big-end bearing get lubed?

And the crankshafts main bearings?

Dave

Big end is pressure fed from the pto side from a cavity on the clutch cover (be sure to check the seal that slides over the crank in the cover after removal). The mains are splash fed.