09 600 RMK Air bubble appearing in oil feed line overnight

[SaskRMK]

Alright closer to the end of the season i have noticed that some fresh oil was collecting under the engine and leaking out of the bellypan/exhaust hole. Upon further inspection the longer my sled sat unused the more oil would drain from the oil feed line from the reservoir but only underneath the check valve from the pump. Because of viability and residue on most all portion of the pump it was almost impossible to determine what is actually leaking so i started with replacing the feed line but still had a 2" air bubble appear in the feed line right under the check valve after the first night the sled was ridden after the line was fixed. I bled all of the air out of the line before reassembly. What could be causing this issue? is there a seal around the pump where it mounts to the block? O rings on the pumps shaft?

Thanks for your time

 

[SaskRMK]

What should I be looking for? None of the lines leaving the pump seam to be leaking just a light residue over most of them. Is there a seal on the back of the pump holding it to the block? Is it possible for oil to leak from here? Are there o rings on the gear shaft that could cause this sort of leak? Can the pump develope an external leak on the housing that cannot be repaired? I need some insight from some one who has had the engine out or understands the oil pump better than I do.

Thanks

 

[SaskRMK]

After speaking to a Polaris mechanic he said the only way an oil bubble could form in the feed line is if one of two things are leaking.

1. the fitting for the feed on the pump-new fitting+thread sealer

2. the oil ring on the oiler levers shaft -which means pulling the entire engine and replacing the pump

has to be the one of the two as i just replaced the line

Any insight?

 

[diamonddave]

I believe the bubble is coming in from oil tank caps internal vents not opening long enough.

 

[SaskRMK]

You think it could be something that simple? Your thinking that very small air bubbles in the lines are creeping up and getting stuck below the check valve because the cap is not venting properly? How would this cause an oil leak under my sled?

Should I go about testing this theory by rebleeding the system and replacing my cap with the cap from my dads 2007 600 clean fire and see if the bubble reappears? I would really prefer if I did not have to pull my engine and replace the entire oiler. Would you suggest replacing that check valve as well?

Thanks!

Ttt

 

[diamonddave]

You think it could be something that simple? Your thinking that very small air bubbles in the lines are creeping up and getting stuck below the check valve because the cap is not venting properly? How would this cause an oil leak under my sled?

Should I go about testing this theory by rebleeding the system and replacing my cap with the cap from my dads 2007 600 clean fire and see if the bubble reappears? I would really prefer if I did not have to pull my engine and replace the entire oiler. Would you suggest replacing that check valve as well?

Thanks!

Ttt

Absolutely...If you want proof. Take a 5 gallon gas tank with a clear hose. Start filling the tank with the vent open on the can and watch the clear hose as you start closing the vent. You will see air start entering the clear hose just at a faster rate than your oil supply line.


I had this problem with my sled. After bleeding the line 3 times and checking what it takes for the cap's vent to open, it was pretty clear what was going on. The problem is the cap is tilted approx 25-30 degrees to level ground and many of the caps I've been checking are closed when the sled and oil tank are at flat level ground. Some have the opinion that this vent only needs to open sporadically. I'd like mine to be open more often.


I proved this to a group this weekend who were having this same issue with their sleds. Many people out there aren't even aware that this is happening as they just ride their sled as the only way to find this is to remove the airbox. Many don't bother going this far.

 

[RED BARRON]

i had a air bubble in my feed line slowly got bigger until i couldnt see oil in the line at all. so i bled the line and took my drill with a 1/8 drill bit and drilled a hole in the bottom of the cap. not all the way through the cap but just through the center piece on the bottom or the cap close to the base where it sits on the oil tank. it now allows air flow all the time except when sled is upside down plunger still closes off vent with no leaks. also i go through more oil than before and no air bubbles.