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  1. #1
    Platinum Member
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    Mar 2002
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    567
    Location
    Central Arizona
    Tractor
    YM1500D

    Default Use of compression release

    I realize the compression release is to be used only as a starting aid. My neighbor recently bought a well-used gray market tractor from some folks that told him that pulling the compression release is the way to turn the engine off. He has put maybe 10-20 hours on the meter and now it won't start. It looks to me that it has no compression. When the starter is engaged the engine speed is about the same with the compression release on or off. Is it likely that the misuse of the release is related to his problem? How does that affect the engine?

  2. #2
    Super Member clemsonfor's Avatar
    Join Date
    Sep 2009
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    7,022
    Location
    Greenwood Co., SC
    Tractor
    Yanmar YM2000

    Default Re: Use of compression release

    The compression release holds the exhaust valves i beleive open (pretty sure its exhaust and not intake) to release compression.

    Its not suppose to be used to kill engine but some will use it like that. I would only use it in emergency like stuck injection pump or something on a runaway engine.

    It could be that the lever is stuck or hung open where it comes through the vavle cover gasket so there is no compression. Raise the hood and look at where it connects to make sure its functioning.
    YM2000. MF dirt scoop,4' Jbar bushhog,boompole, LMC 12-16 disk harrow, 4' Atlas boxblade (with rippers). 1980 chevy K10,1990 ford ranger 2wd (285K miles),1997 saturn SL2 (twin cam!!),2001Toyota Higlander
    1986 Cobia 177 sunskiff w/1981 Johnson 60 hp
    1991 Javalen 17ft w/same year 150 Johnson GT
    Troybuilt 4 cycle & Echo 2 stroke,cold natured(need carb rebuild),MS390 Stihl, Northern tool pressure washer, mixes water into the oil in the pump(now dead, motor on a tiller). 5000 watt generator.

  3. #3
    Elite Member
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    Dec 2009
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    3,096
    Location
    gilmer tx
    Tractor
    Bobcat CT235

    Default Re: Use of compression release

    If it acts like no compression that is where I would begin looking making sure the shaft is free and turning where it goes through the valve cover.

  4. #4
    Super Member California's Avatar
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    Jan 2004
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    6,183
    Location
    Sonoma County
    Tractor
    Yanmar YM240, YM186D, and another YM186D

    Default Re: Use of compression release

    Quote Originally Posted by reb View Post
    bought a well-used gray market tractor from some folks that told him that pulling the compression release is the way to turn the engine off.
    I was told the same thing when I bought my Yanmars. Before I could make the YM186D shut down as intended (by pulling the throttle to zero) I had to adjust its throttle linkage and then added a non-stock additional return spring. So apparently the compression release method had been used for a long time. Years of using the compression release to stop them doesn't seem to have hurt them.

    However the manual says to not do this.

    In your instance: I don't think you have any lasting damage but as Clemson and Winston said, something in the compresion release linkage must be out of adjustment and holding the valves open. The tractor should be fine after you get that adjusted properly.
    Last edited by California; 09-28-2012 at 06:06 PM.

  5. #5
    Super Member clemsonfor's Avatar
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    Sep 2009
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    7,022
    Location
    Greenwood Co., SC
    Tractor
    Yanmar YM2000

    Default Re: Use of compression release

    I have heard some say not to cut the motor off with the comp. release lever casue the pistons could hit the valves. Well if the valves are going to hit when you open the comp release to shut it down, then they would hit when you were cranking it also???

    I still push my throttle foward all the way but have made a habit of pulling the linkage shut all the way to make sure it shuts down quickly and does not deisel as it sometimes does not cut off as soon as you close the hand throttle.
    YM2000. MF dirt scoop,4' Jbar bushhog,boompole, LMC 12-16 disk harrow, 4' Atlas boxblade (with rippers). 1980 chevy K10,1990 ford ranger 2wd (285K miles),1997 saturn SL2 (twin cam!!),2001Toyota Higlander
    1986 Cobia 177 sunskiff w/1981 Johnson 60 hp
    1991 Javalen 17ft w/same year 150 Johnson GT
    Troybuilt 4 cycle & Echo 2 stroke,cold natured(need carb rebuild),MS390 Stihl, Northern tool pressure washer, mixes water into the oil in the pump(now dead, motor on a tiller). 5000 watt generator.

  6. #6
    Advertiser
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    Jun 2005
    Posts
    201
    Location
    Washington

    Default Re: Use of compression release

    compression release is a big help with low batteries.if you sell tractors and start them a lot but don't run them long is a big help. i wish all diesel had them
    Coldwater Tractors, Inc.
    www.coldwatertractors.com

  7. #7
    Platinum Member
    Join Date
    Mar 2002
    Posts
    567
    Location
    Central Arizona
    Tractor
    YM1500D

    Default Re: Use of compression release

    Thanx for the replies.

    The linkage is ok. I think the engine is just worn out. He commented about lack of power shortly before it quit on him.

    I can't visualize any way that using the compression release to turn off the engine can hurt. Just asking if anyone knew more about it than I.

  8. #8
    Platinum Member
    Join Date
    Oct 2010
    Posts
    595
    Tractor
    New Holland TC 29D

    Default Re: Use of compression release

    When you shut down the engine with the compression release the fuel injector pump is is still pumping, that will put raw fuel into the cylinders that won't be burnt. That fuel could possibly wash the oil off of the clyinder walls, leading to increased wear.
    TC-29DA
    BX-1500

  9. #9
    Elite Member
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    Dec 2009
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    3,096
    Location
    gilmer tx
    Tractor
    Bobcat CT235

    Default Re: Use of compression release

    Quote Originally Posted by V1Rotate View Post
    When you shut down the engine with the compression release the fuel injector pump is is still pumping, that will put raw fuel into the cylinders that won't be burnt. That fuel could possibly wash the oil off of the clyinder walls, leading to increased wear.
    That makes sense. First explantion I have heard.

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