Polaris $700 Oil Cap Question

[Adobe-Al]

Just figured out my oil cap was on 09 700 was not venting. It seized and ruined the mag piston/cylinder and scuffed the PTO piston. So my question is how bad did I damage the crank bearings? Has anyone had a lack of oil seizure and had the lower end be ok? Thanks for any thought!

 

[diamonddave]

Just figured out my oil cap was on 09 700 was not venting. It seized and ruined the mag piston/cylinder and scuffed the PTO piston. So my question is how bad did I damage the crank bearings? Has anyone had a lack of oil seizure and had the lower end be ok? Thanks for any thought!

This oil cap is definately an issue that I believe is being overlooked bigtime. I started a thread about this last spring. When my sled is sitting in my shop, I can crack the bleeder on the oil pump and ZERO oil will come out of the oil pump. You can wait 5 minutes and nothing will happen, unless you unscrew the cap, then she comes a rushing out.

I also had my oil bubble return after bleeding the oil pump 2 times now. This will remind me to get on the stick for finding a different cap.


http://www.snowestonline.com/forum/showthread.php?p=2572828#post2572828

 

[Adobe-Al]

Dave-when I pulled the oil line off the white filter I could hear air being sucked back towards the oil tank. I cracked the cap and oil started coming out. When I tightened it back up the oil stopped after a little bit. So then I took a cap off another sled and tried it. The oil slowed, but never stopped like it did with my bad cap. My question is what are the chances of my lower end being shot? I know someone has had to have a lack of oil failure and was wondering if they got by with just a topend?

 

[HUNDO]

I had the oil pump bolts back out and the pump fall off on my kid's sled last year. It stuck the pistons but the lower end was fine. Since the fuel system uses so much more oil than the lubrication system, I don't think you have anything to worry about...the pistons will always go before your bearings run out of oil.

 

[Tanman]

does anyone make a billet oil tank cap? with just a good, moto-cross style breather check valve on the top. That would be well worth the money, for the bling and guess factor if possible oil delivery failure causing engine seizure has occurred.

 

[xc6rider]

Do this if you want a good back-up vent.

http://www.snowestonline.com/forum/showpost.php?p=2573243&postcount=43

 

[Adobe-Al]

Just got the sled back together and it sounds great! I drilled a couple of holes in cap, temp fix until I get a new one. I ran a wire in and out of the PTO oil line to create a small bubble, so I could the watch the oil move. It moved as I let the machine idle, so I assume my pump is now pumping. I know 100% that cap was not venting correctly. I just hope that was the cause of my motor failure. Hundo- thanks it makes me feel a lot better knowing that the lower end is ok. I check for vertical movement in the rod and could not feel anything. If I had lower end damage wouldn't the rod bearing be the first to go? since it is bathed in fuel. Thanks for all the input

 

[polariman]

I read your post a while back and thought I would check my oil cap. According to the cap manufacturer it will stop venting at 35 degrees. Funny thing is I checked mine and it stopped venting at 30 to 35. Each time was a little different and the cap off my other sled stopped before that. It screws on flat so not worried about that one. I then decided to measure the degree of the filler neck on my sled and it is 33 degrees . I suppose the up and down and carving around in the snow is enough to keep it venting a little at a time. That just doesn't seem right to me.


I also think you guys are on to something with this post. If air can't get in all the time then oil can't get pumped out either.