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joninak

2018 Sportsman 570 - Blown Head Gasket?!?

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Well, it overheated then started blowing white smoke!!

I have it torn down & the cylinder appears to be warped. Going to have the head checked out next but in the meanwhile... Does anyone have the torque sequence/specs for the head bolts??

TIA

 

 

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21 hours ago, joninak said:

Well, it overheated then started blowing white smoke!!

I have it torn down & the cylinder appears to be warped. Going to have the head checked out next but in the meanwhile... Does anyone have the torque sequence/specs for the head bolts??

TIA

 

 

...Finally got my 10 post threshold & DL'd the service manual. Thanks!!

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My best guess was a bad T-stat. After the tear down, every component was inspected and/or replaced, including T-stat & pump impeller. She runs closer to 185° now. Previously ran over 200° at an idle. Even the smallest thing can effect the engine temps.

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11 minutes ago, joninak said:

My best guess was a bad T-stat. After the tear down, every component was inspected and/or replaced, including T-stat & pump impeller. She runs closer to 185° now. Previously ran over 200° at an idle. Even the smallest thing can effect the engine temps.

Were there any indicators, lights or anything when it started to overheat? Did the fan come on? Kind of odd for a 2018 to blow a head gasket so soon. Shouldn't it be under warranty?

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The radiator fan was kicking in way too often. I'd heard the newer machines are designed to run hotter, (for emissions I believe) so I didn't pay too much concern to that. The other item of note was that the maximum temp it would hit was increasingly higher. By the time I drove it into the shop it was blowing white smoke... 

The cylinder was so warped I could see daylight under the machinist straight edge. Had the head cleaned & checked at a machine shop. Since I was replacing the cylinder I decided to do a new piston kit as well. Everything new (per the service manual) from Polaris came out to around $500.

As far as the warranty... Maxwell Smart said it best - "Missed it by that much!"

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...So far so good. I have the engine temp on my display all the time now. It's only in the 40's here at this time of year so we'll see how it does come June/July... 

Big thanks to the person that shared the service manual on this site!!

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