Quantcast
Jump to content

Kohler lh775 missing on 1 cylinder


Brokebuggy
 Share

Recommended Posts

OK here goes.  I have a cub cadet volunteer with a fuel injected Kohler lh775.  This was brought to me from another shop since they couldn't figure it out.  

Here's their story.

came in for a water pump.  tech pulled the intake and a few other misc parts and replaced the water pump.  Reassembled and the motor was missing on cylinder 2.  replaced several parts and just couldn't get it to run on both cylinders.

 

So in my shop we checked compression 155ish on both cylinders at wot.  I can get the motor to start if I hold the gas pedal in just the right place but at low RPM's it very rough.

Pulled side cover and verified timing is correct and key ways are not sheared

turned over motor with injectors out and they spray evenly and the same. best I can tell by eye

installed new plugs and got motor to start and held it at higher RPM's for a few seconds.  cylinder 1 plug is dark cylinder 2 is still new and seems  damp with gas

switched coils from 1-2 installed new plugs again and same test with same results.  

The other shop replaced the ECU and harness.  No matter what parts I switch from cylinder 1 to cylinder 2 the problem stays on cylinder 2.  

 

Any thought or ideas would be greatly appreciated  

Link to comment
Share on other sites

I agree I have had a spark checker on both cylinders during the checks. Both coils are firing. I have also had 3 new plugs in cylinder 2. The first I changed to run the motor and read it and ever time I ran it with cylinder 1 parts.  So  kinda got to rule out spark. 
 

when I had the motor out I checked timing and key ways. All are good. I even turned the motor over by hand several times and watched the valves in regard to piston stroke. All is good. Piston goes down intake valve opens. Both valves close piston comes up for comp stroke then exhaust valve opens. Did this on both cylinders probably 10 times. Timing marks (crank [email protected] o’clock and cam mark @ 6 o’clock ) every 4th revaluation. 

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

  • Similar Topics

    • By GRAYWHISKERS
      So my engine was locked up. Pulled flywheel and found alot of mud and the magnets broken. Anyone else have the magnets break?

    • By res2fr
      Hello All,
       
       I am trying to find a Scanner that is works for a 2016 MSU500. I found the Tiny Scan TS301 that looks like a decent Scanner but so far have not been able to get confirmation that this works on and older model. It has been stated that it works on the 2019 and newer but not sure about older models. It appears that the ECM/ECU/EFI modules are likely interchangeable between a 2016 and the newer 2019 and on but not sure of the Scanner. I am waiting for feedback from Hisun on this issue right now.
       If this unit is not usable for my model year has anyone found and a Diagnostic Scanner for the older machines, one that works and is Affordable?
      Thanks for reading my post and any information that you may have to share,
      Robert
    • By Hisunsadman
      I have recently acquired a 2012 CFMOTO 500 CC side by side. The previous owner said that it ran great but had a gas leak by the throttle body that caught fire and ruined most of the parts on top. It also melted the cover and fan for the stator. Does anyone know of a good place to get all of these parts? I usually use Amazon for all my 2020 hisun parts, but can't really find the ones I need for this. If anyone has any ideas I would greatly appreciate it. Thanks in advance
    • By Travis
      Kawasaki Mule 1000 / 2010 / 2020 / 2030 / 2500 / 2510 / 2520 /3000 / 3010 / 3020 / 500 / 520 / 550 / 600 / 610
      A lot of the older mules use a float and sight glass for viewing fuel level in the tank, mine, like many others has been fogged over for several years making it hard to see the needle. I've used all sorts of cleaners in an attempt to clear it up, but none ever worked long term.
       I finally discovered this kit from ATV Works for $17.00, just the sight glass and new attachment pin (which you can not get from kawasaki)  Kawasaki want's you to order the entire float and gauge assembly for nearly $40. I ordered it last night and it hopefully should be here by the end of the week. When i get it in, i will make a video on how to install it.

       
       
    • eManualOnline
    • By Mackc
      What type and brands of insulation do you use in the cabin, floor and engine compartment of your Massimo and related 4 by 4 UtVs specially Massimo Buck 400s?

×
×
  • Create New...