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Hole in 120 crank housing

Discussion in 'RS General Talk' started by Garrett Humphreys, Nov 25, 2018.


  1. Garrett Humphreys

    Garrett Humphreys Newbie

    Messages:
    7
    Location:
    1311 kinburn side road
    Country:
    Canada
    Snowmobile:
    Yamaha rs rage
    Hey I just wanted to see if anyone else has noticed a small hole in top of crank housing. It seems yamaha didnt leave enough cast thickness, after tapping for the bolt. My engine blew last year and it was all caused by water blocking my oil cooler that I beleive over time seeped through the hole and into crank housing, enough water got in that when it froze it blocked my oil cooler and over heated motor. Is this possibly a flaw in the motor?
     

    Attached Files:

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  3. Srxspec

    Srxspec Ulmer Racing Advertiser Tech Advisor VIP Member

    Messages:
    5,028
    Location:
    Menno, SD
    Country:
    USA
    Snowmobile:
    2014 Yamaha SR Viper LTX, 2014 Yamaha SR Viper RTX SE, 2015 Yamaha SR Viper MTX SE 162 (turbo), 2015 Yamaha SR Viper MTX SE 153
    That won't let water into the engine, as that hole should not be open to the actual inside of the engine.
     
  4. Garrett Humphreys

    Garrett Humphreys Newbie

    Messages:
    7
    Location:
    1311 kinburn side road
    Country:
    Canada
    Snowmobile:
    Yamaha rs rage
    What do you think could allow atleast 2 cups of water into crank housing? Any suggestions?
     
  5. Garrett Humphreys

    Garrett Humphreys Newbie

    Messages:
    7
    Location:
    1311 kinburn side road
    Country:
    Canada
    Snowmobile:
    Yamaha rs rage
    There was rust around the crank bearing, rust looked to trailer around bearing and into crank housing, engine had 6300 kms on it
     
  6. Garrett Humphreys

    Garrett Humphreys Newbie

    Messages:
    7
    Location:
    1311 kinburn side road
    Country:
    Canada
    Snowmobile:
    Yamaha rs rage
    When I opened up crank housing, the oil cooler screens were full of ice and piston on clutch side had seized, oil was slushy and had been changed 200 kms before it blew with yamaha lube and new filter
     
    Last edited: Nov 26, 2018
  7. Srxspec

    Srxspec Ulmer Racing Advertiser Tech Advisor VIP Member

    Messages:
    5,028
    Location:
    Menno, SD
    Country:
    USA
    Snowmobile:
    2014 Yamaha SR Viper LTX, 2014 Yamaha SR Viper RTX SE, 2015 Yamaha SR Viper MTX SE 162 (turbo), 2015 Yamaha SR Viper MTX SE 153
    Do you remember if it was low on coolant? Are you sure the air box was completely sealed to the carbs/throttle bodies? You likely had a issue somewhere else to let the moisture in. That particular bolt hole is like that on every Yamaha 3 cylinder I'm 99% sure.
     
  8. Garrett Humphreys

    Garrett Humphreys Newbie

    Messages:
    7
    Location:
    1311 kinburn side road
    Country:
    Canada
    Snowmobile:
    Yamaha rs rage
    Coolant level was good,I'm 99% sure everything was sealed properly, but always a chance somthing could have come loose I guess, was running perfectly, I let it warm up for about 5 minutes after temperature light turned off. Was about -25 out if not colder that morning. Rode up to the gas station( 2 minute ride, and on my way back herd a few ticks and then it seized.
     
  9. Garrett Humphreys

    Garrett Humphreys Newbie

    Messages:
    7
    Location:
    1311 kinburn side road
    Country:
    Canada
    Snowmobile:
    Yamaha rs rage
    Ive also noticed the hole on 3 other 3 cyclinder 120s
     
  10. Vector LTX GT 08

    Vector LTX GT 08 Expert

    Messages:
    368
    Location:
    Rockwood, Maine
    Country:
    USA
    Snowmobile:
    2008 Yamaha Vector LTX GT.
    WEBSITE:
    www. Moosehead Lawn Care.com
    YAHOO:
    colemanbodemer@yahoo.com
    My cousins 2005 rage had the same hole in the motor, and he had 32,000 miles on it, no issues. I have 24,500 miles on my 08 vector (same motor updated timing chain), and my brother has 19,500 miles on his 09 vector.
     
  11. Garrett Humphreys

    Garrett Humphreys Newbie

    Messages:
    7
    Location:
    1311 kinburn side road
    Country:
    Canada
    Snowmobile:
    Yamaha rs rage
    Thats the thing, these motors are near bullet proof, thats why I was shocked when mine seized, I picked up another engine with 7000 kms on it had it professionally installed, and looked over. Everything was fine, took it home and anytime I'd punch it , coolant would blow out the overflow hose, took it back and turns out it either has a shitty head gasket, or cracked cylinder, cylinders looked perfect, so we did head gasket, well see what happens when its all back together.
     
  12. RSVECTORFREAK

    RSVECTORFREAK Lifetime Member Lifetime VIP Member VIP Member

    Messages:
    1,144
    Location:
    Chassell Michigan
    Country:
    USA
    Snowmobile:
    2005 RS Vector ER
    I have that same hole in my vector. I covered it with a small piece of aluminum and jb welded over it. That was a couple thousand miles ago.
     
    Vector LTX GT 08 likes this.

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