Page 1 of 2 12 LastLast
Results 1 to 10 of 19
  1. #1
    New Member
    Join Date
    Sep 2012
    Posts
    22
    Location
    North Carolina
    Tractor
    Tiashan Dragon 270

    Default Compression release on tractor

    i recently bought a taishan dragon 270 and was wandering what the compression release was used for and how is it suposed to be used. never saw this on one.

  2. #2
    Platinum Member
    Join Date
    Jul 2007
    Posts
    874
    Location
    WV
    Tractor
    John Deere 1026R

    Default

    On a motorcycle you pull the compression release lever and get the engine to tdc then release the lever and kick. Be careful when kick starting your tractor. It has a lot of compression.

    On my chainsaw you press the compression release and it locks in the active position. Then you pull the starter cord and it automatically releases.

  3. #3
    Bronze Member
    Join Date
    Aug 2009
    Posts
    99
    Location
    central/ se michigan
    Tractor
    Kubota L3130DT

    Default Re: Compression release on tractor

    Had one on my old L185 DT. I used it in the extreme cold when I couldn't get the engine to turn over under compression. I would release the compression after glow, crank the engine and reengage the compression once the engine is spinning. It was never as effective as warming the engine with a shop heater when it was really cold out. Don't know if that was the proper procedure but it worked for me.

  4. #4
    Super Member greg_g's Avatar
    Join Date
    Dec 2003
    Posts
    6,028
    Location
    Western Kentucky
    Tractor
    JD3720 Cab, 300X loader with 4-in-1 bucket

    Default Re: Compression release on tractor

    Quote Originally Posted by stampede38899 View Post
    i recently bought a taishan dragon 270 and was wandering what the compression release was used for and how is it suposed to be used. never saw this on one.
    Compression releaseon a diesel engine is a starting aid. Activating it by pulling a cable or turning a lever causes one set of valves to open slightly, temporarily disallowing compression. The starter motor then has a much easier time turning the flywheel, saving wear and tear on itself and on the battery. It also turns the oil pump, which then starts pushing oil back into the now-empty passages. My procedure was to open the compression release, engage the starter, then watch the oil pressure gauge. As soon as it was spinning fast enough to indicate pressure on the gauge, I'd let go of the compression release. Except in the coldest of conditions, that was usually enough to start on the first try.

    //greg//
    USN (Ret)
    Former Chinese tractor owner (x4)
    Current John Deere owner

  5. #5
    Elite Member RonMar's Avatar
    Join Date
    May 2005
    Posts
    2,761
    Location
    Port Angeles WA
    Tractor
    Jinma 284 delivered 06/28/05

    Default Re: Compression release on tractor

    +1, particularly the part about building oil pressure without applying load to piston and rods. This saves a lot of wear on crank and rod bearings by allowing an oil film to be built before compression load is applied. Also, diesel starters are very powerfull. If for some reason some moisture has found it's way into the cylinders(leaking head gasket or rain down the intake or exhaust ect), compression release allows this fluid to be expelled. If it is not, this could cause a hydraulic lock and the starter can be powerfull enough to bend rods, twist the crank or damage flywheel and starter...

    I use mine on every start...
    Ron

  6. #6
    Bronze Member
    Join Date
    Feb 2012
    Posts
    52
    Location
    Desota Forest, ms.
    Tractor
    WT404

    Default Re: Compression release on tractor

    While on issue. Hickory Creek here. In old posts, I have stated that my SL 3105 engine will run with compresssion lever engaged. First, thanks to all, I have used the heck out of the tractor this year. Now, I have not tried to adjust compression release. I assume one removes valve cover. From there, are there any alingment marks or does one adjust nuts on linkage whatever so valves open just slightly or what? I am having to use two batteries to start this thing unless I use starting fluid.

  7. #7
    Platinum Member
    Join Date
    Nov 2008
    Posts
    802
    Location
    US Virgin Islands
    Tractor
    Jinma JM304

    Default Re: Compression release on tractor

    The odds are that the compression release lever is not properly engaged inside the valve cover. On my 304 Jinma there isn't anything to adjust - it either is correctly position to lift the exhaust valves or it isn't and then it doesn't work. If you pull the valve cover you should be able to see =what needs to happen - it is a simple lever arrangement on mine.

  8. #8
    Platinum Member
    Join Date
    Dec 2006
    Posts
    708
    Location
    Coastal Rhode Island
    Tractor
    Jinma 354, purchased 2007

    Default Re: Compression release on tractor

    On my 354 Jinma it is very easy for the lever to come disengaged when I take the valve cover off. With the valve cover off, it's pretty easy to see how it works -- there is a shaft that runs parallel to the valve train that pushes down on the valves when it is turned. There is a lever on the outside of the valve cover that turns that shaft when it is pulled. Connecting the lever to the shaft is a metal dowel, about 3/8" in diameter and 5/8" in length, with a slot on each end. That dowel tends to fall out when the valve cover is removed, and then roll to the most inaccessible spot in the shop. It takes a lot of fiddling to get the valve cover, lever, shaft and dowel all aligned properly on reassembly. What I have to do is unbolt the lever, assemble everything else and then bolt the lever back on.

    With the valve cover in place you can easily tell by pushing on the lever whether it is engaged properly -- there is either a lot of resistance, or none.

  9. #9
    Super Member greg_g's Avatar
    Join Date
    Dec 2003
    Posts
    6,028
    Location
    Western Kentucky
    Tractor
    JD3720 Cab, 300X loader with 4-in-1 bucket

    Default Re: Compression release on tractor

    Quote Originally Posted by Hickory Creek View Post
    I have not tried to adjust compression release. I assume one removes valve cover. From there, are there any alingment marks or does one adjust nuts on linkage whatever so valves open just slightly or what?
    First thing to do is to make sure the linkage from the operator station to the valve cover is actually connected - on both ends. Then confirm that - when engaged from the operator station - there's actually rotation visible at the point where it goes through the valve cover. If those two things are happening - and you still have no compression release - only then should it be necessary to remove the valve cover. Let me know what you find before actually taking the cover off, and we'll go from there.

    //greg//
    USN (Ret)
    Former Chinese tractor owner (x4)
    Current John Deere owner

  10. #10
    New Member
    Join Date
    Sep 2012
    Posts
    22
    Location
    North Carolina
    Tractor
    Tiashan Dragon 270

    Default Re: Compression release on tractor

    So this is an aid to help with cranking, do they use that instead of glow plugs in these chunese tractors? i beleive my tractor has the plugs as my switch has a place for it.

Page 1 of 2 12 LastLast

Similar Threads

  1. Use of compression release
    By reb in forum Yanmar
    Replies: 8
    Last Post: 09-29-2012, 09:27 PM
  2. CK20 Compression release.
    By slantram in forum Kioti Owning/Operating
    Replies: 6
    Last Post: 03-21-2011, 09:07 PM
  3. garden tractor compression release
    By bjr in forum John Deere Lawn & Garden
    Replies: 0
    Last Post: 04-29-2010, 11:07 AM
  4. Compression release...........
    By DirtHauler in forum Kioti Owning/Operating
    Replies: 4
    Last Post: 01-04-2005, 06:42 AM
  5. Compression Release
    By Anonymous Poster in forum Yanmar
    Replies: 13
    Last Post: 12-18-2002, 07:39 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2014 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.