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  1. #11

    Join Date
    May 2018
    Posts
    10
    Location
    United States
    Mower
    Toro

    Re: Kohler XT 675 Spitting Oil Out Crankcase Breather - HELP!

    Okay, I went back in and cleaned off the head and the piston to the best of my abilities at the time. The piston cleaned up pretty well and I could not find any cracks. I also cleaned the head and again couldn't find anything out of the normal. I also looked over the cylinder wall and it looks in great condition. You can still see the lines from the initial factory honing on the cylinder wall. I have taken apart many briggs with worse condition cylinder walls that are still in great running condition. I also took a look at the breather valve cover on the crankcase and it looks pretty good. I have attached more pictures of each of the above mentioned points.

    Tomorrow I am going to go rent a compression tester from the local auto parts store. Does anyone know what value I should be getting on this mower? If the compression checks out, any ideas?

    Thanks everyone!

    IMG_1713.jpgIMG_1712.jpgIMG_1711.jpgIMG_1710.jpgIMG_1709.jpg

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  3. #12

    Join Date
    Nov 2014
    Posts
    9,792
    Location
    Australia
    Mower
    Victa slashers & Push , Rover Rancher II's, Cox ( several ) & White LT120 + GT 200

    Re: Kohler XT 675 Spitting Oil Out Crankcase Breather - HELP!

    Save your money.
    A compression test will tell you absolutely nothing on these engines because of the decompression and if you defeat the decompression you will not be able to rotate the engine.
    Normally I would have suspected the oil ring but generally when they are gone the engine smokes really badly.
    At this point in time my tendency would be to pull the piston out & check the rings.
    Also to check the bore for cracks.
    In order to get oil blowing a few feet out of the breather you need a lot of crankcase pressure.

  4. #13

    Join Date
    May 2018
    Posts
    10
    Location
    United States
    Mower
    Toro

    Re: Kohler XT 675 Spitting Oil Out Crankcase Breather - HELP!

    Quote Originally Posted by bertsmobile1 View Post
    Save your money.
    A compression test will tell you absolutely nothing on these engines because of the decompression and if you defeat the decompression you will not be able to rotate the engine.
    Normally I would have suspected the oil ring but generally when they are gone the engine smokes really badly.
    At this point in time my tendency would be to pull the piston out & check the rings.
    Also to check the bore for cracks.
    In order to get oil blowing a few feet out of the breather you need a lot of crankcase pressure.
    Where is the automatic compression release even located on one of these engines. I thought they tended to only put those on larger (10hp+), guess not. Any thoughts on how I could jury-rig something to make a leak down tester? I would prefer not to have to buy any diagnostic tools. How difficult is splitting the case to remove the piston for checking the rings etc. I checked the bore pretty well from what is visible when the piston is down and couldn't find anything wrong with it.

    Thanks,

  5. #14

    Join Date
    Nov 2014
    Posts
    9,792
    Location
    Australia
    Mower
    Victa slashers & Push , Rover Rancher II's, Cox ( several ) & White LT120 + GT 200

    Re: Kohler XT 675 Spitting Oil Out Crankcase Breather - HELP!

    Check out U-tube dozens of "how to make a cheap leak down tester " videos out there.
    You can pump up the cylinder with a reasonably good tyre foot pump.

  6. #15

    Join Date
    May 2018
    Posts
    10
    Location
    United States
    Mower
    Toro

    Re: Kohler XT 675 Spitting Oil Out Crankcase Breather - HELP!

    Quote Originally Posted by bertsmobile1 View Post
    Check out U-tube dozens of "how to make a cheap leak down tester " videos out there.
    You can pump up the cylinder with a reasonably good tyre foot pump.
    Okay. I built a leak down tester. How long should it hold 100 psi? When I take the reading from the second gauge do I wait some amount of time to take it?

  7. #16

    Join Date
    May 2018
    Posts
    10
    Location
    United States
    Mower
    Toro

    Re: Kohler XT 675 Spitting Oil Out Crankcase Breather - HELP!

    Quote Originally Posted by bertsmobile1 View Post
    Check out U-tube dozens of "how to make a cheap leak down tester " videos out there.
    You can pump up the cylinder with a reasonably good tyre foot pump.
    Okay. So I built a leak down tester and used it. I had the regulator at 100psi and was reading about ~94 psi on the second gauge. From what I can tell these are good results? Can anyone confirm? If they are good, any other ideas on what to test besides tearing the whole thing down and checking all specs?

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