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I have developed a oil leak on my 2000 sportsman 335 at the bottom of the engine. It leaks out of a small hole. It does not leak all the time. The leak just started. Anyone have a fix? Manual does not show anything.
 

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Welcome to the board!:med:
 

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Maybe give a few more details, being descriptive as you can. Exactly where it's leaking. Not being hard on you just need a few more details to help. I own a 335...
 

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Bottom right side of motor. There is a plate with three bolts there and then below then below is a small hole. This is where it is leaking. Is there a seal behind the plate there? Thanks.
 

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Water pump weep hole? there is a mechanical seal for the water pump and an oil seal behind that, usually leak antifreeze first then people cange oikl seal while they are doing the other one.
 

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Is your machine water cooled? My 1999 is air cooled. I looked at mine today and could not figure it out. I don't have a service manual either
 

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Air cooled with oil cooler. The four bolt plate on right side of engine (straight in from foot brake) is where I have a leek. It seems that the 500 and 335 has the same design, except the 335 does not have a water pump. So there is a oil seal behind the plate that is leaking. Seems like it is pretty easy to replace. I ordered one last night for 20.00 w/shipping. If you search the internet for a 500 water pump leak, you can find more info on the oil seal. Seems it is highly recommended to replace it if you have to replace the water pump. Not much info on it for the 335. Both are the same though. Hope this helps.
 

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Air cooled with oil cooler. The four bolt plate on right side of engine (straight in from foot brake) is where I have a leek. It seems that the 500 and 335 has the same design, except the 335 does not have a water pump. So there is a oil seal behind the plate that is leaking. Seems like it is pretty easy to replace. I ordered one last night for 20.00 w/shipping. If you search the internet for a 500 water pump leak, you can find more info on the oil seal. Seems it is highly recommended to replace it if you have to replace the water pump. Not much info on it for the 335. Both are the same though. Hope this helps.
I have 335 (purchased new) and suddenly started leaking in location described above. I removed the 4 bolt cover to inspect the oil seal and found the seal laying in the bottom of the water pump cavern. (No water pump exists on 335 as is oil cooled.) I bought an old 335 engine which wasn't running for parts/ cheap . Removed same cover and also found the oil seal laying inside. Yikes!
The seal (#3084836) is only press fit. There is no E-ring, retainer or water pump assembly to maintain the oil seal inside the arbor. This appears to be a major design flaw in the Polaris engines. Seems the oil pressure at higher PM eventually blows out the seal over time. I pulled and inspected the oil PRV and was within spec and worked freely. Assume this is why the 335 had been discontinued.
This is an old post but felt I should post for information to those that have same issue. Maybe Polaris has heavy stock in oil industry?

I am going to purchase a new ATV soon. Probably go for a Honda, Kawasaki or something else. Seems I find many issues with the Polaris engine designs.
 
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