Results 1 to 4 of 4
  1. #1

    Join Date
    May 2018
    Posts
    2
    Location
    United States
    Mower
    Toro

    Kohler XT 675 Spitting Oil Out Crankcase Breather - HELP!

    Hello Everyone, Hoping someone could help me on this issue!

    I am at wits end with my Toro Recycler mower with a Kohler XT-675 engine on it. Currently this engine will spit oil (with velocity) out the crankcase breather which vents into the air filter box. Usually it puts enough oil in the air filter to fill the carburator and stall the engine. This ends up with either requiring a carb clean or a few week sit for most of it to drain back out and allow to start again. I have verified multiple times that oil level is within specs. For someone to visualize how much force the oil is being pushed with, you can imagine without the air filter on, the oil is propelled out the air box 1-2 feet away from the mower.

    One thing I read online is the float in the carb may be stuck open thus causing the engine to flood and the oil to thin out raising the level higher and thus making it come out the breather tube on the crankcase. I have rebuilt the carb and it is still having oil blow out the crankcase breath. One thing to note is the oil is not thin and does not have a strong smell of gas either.

    I have rebuilt the breather with a new spring and disc under the recoil starter of the mower with the assumption it was staying open allowing oil past it. This also did not fix it.

    Other things I have done to try and remedy this is done a valve job. Both the intake and exhaust where about 0.002" out of spec but are within spec now. Still, none of these remedies have helped.

    Next things would be to check if the clearance between the cylinder wall and piston rings is within spec, but I have not had a chance to tear it down that far yet.

    Details of the engine are : Spec No PH-XT675-2011 serial number 4210428758

    Does anyone have any ideas or known fixes for this issue?

    Thanks in advance to everyone who tries to help!!!!

  2.  

  3. #2

    Join Date
    Nov 2014
    Posts
    8,288
    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!

    Your head gasket is leaking between the cylinder and the push rod tube.
    This is often a by-product of a leaking carburettor because if you try & crank it with liquid fuel in the cylinder, the liquid can not compress so it blows out the gasket.

  4. #3

    Join Date
    May 2018
    Posts
    2
    Location
    United States
    Mower
    Toro

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

    Quote Originally Posted by bertsmobile1 View Post
    Your head gasket is leaking between the cylinder and the push rod tube.
    This is often a by-product of a leaking carburettor because if you try & crank it with liquid fuel in the cylinder, the liquid can not compress so it blows out the gasket.
    Thanks Bertsmobile1 for the response. I do not have the time to do a more comprehensives tear down to replace the head gasket on this mower currently. Is it possible to just block the tube leading into the air filter housing from the crankcase breather for now? Will the back pressure caused by clamping that hose cause issues with the engine? Was this a common problem on these mowers? Are there other signs that the carb was leaking liquid fuel into the intake besides the symptoms I have been describing? The reason I ask is I have been checking the spark plug and there are no signs that the mower has been running rich.

    Thanks!

  5. #4

    Join Date
    Nov 2014
    Posts
    8,288
    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!

    No that will not work it will only get worse and blow the seal on the dip stick tube and then the fuel pump if it has one.

    If you need to use the mower disconnect the breather tube.
    Block off the hole in the filter housing then run some more hose on the breather to a catch bottle which will slowly fill up with oil.

    Check the oil, if it smells like fuel then the oil must be changed .
    Failure to do this will destroy the engine very quickly.

    It is all of 2 to 3 hour job if you have never done one before.
    Whip the blower housing off ( 4 bolts )
    Undo the tip handle and stand the mower on its back so the cylinder is pointing up.
    On some mowers you need a weight on the handles to stop them falling over.
    Undo the two bolts holding the carb manifold to the head, leave the carb attached to it and move it out of the way.
    Leave the muffler in place undo the 8 or 9 bolts holding the head in a criss cross pattern

    Assembly is the reverse.
    Dont have to do it in one hit.
    1/2 hour after dinner over 3 or 4 nights.

Similar Threads

  1. Kohler Courage 27 SV740S- Oil from Breather
    By GPD-JMD in forum Kohler Engine Forum
    Replies: 1
    Last Post: 10-18-2014, 07:58 PM
  2. Engine Kohler oil breather/separator leaking
    By tkcas01 in forum Exmark Forum
    Replies: 0
    Last Post: 03-24-2014, 10:46 PM
  3. Replies: 3
    Last Post: 05-27-2013, 04:58 AM
  4. Kohler courage spitting oil out breather tube
    By kevicarlson in forum Kohler Engine Forum
    Replies: 7
    Last Post: 02-02-2013, 10:14 PM
  5. XT-6 Kohler Oil out the breather
    By dougmac in forum Kohler Engine Forum
    Replies: 3
    Last Post: 04-18-2012, 10:15 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •