Broken connector near Valve Cover

   / Broken connector near Valve Cover #1  

jebwhs87

New member
Joined
May 20, 2025
Messages
4
Tractor
John Deere 1993 425
I was replacing the Rocker Cover Gasket MIU11358, and when I put the cover back on (left side with the oil fill), I noticed a wire broken. It is a yellow wire with an L shaped connector (Yellow Box). I believe it was attached to the connector (Blue circle). What part do I need and how do I repair this?
JD broken wire marked.jpg
 
   / Broken connector near Valve Cover #2  
Greetings and Welcome. Is this a gas or diesel motor ? Looks like a spark plug. Take another picture showing the entire top of the motor showing scale and orientation.
 
   / Broken connector near Valve Cover #3  
Is the motor water cooled, sort of looks like a temp sensor?
 
   / Broken connector near Valve Cover #5  
I go first with water temp sensor, second choice may e oil pressure switch..... Take sensor base out and see what you get....
 
   / Broken connector near Valve Cover
  • Thread Starter
#7  
Greetings and Welcome. Is this a gas or diesel motor ? Looks like a spark plug. Take another picture showing the entire top of the motor showing scale and orientation.
It is Gas and that is not spark plug wire, this wire is directly to the right of the OHV cover. Will try to get a picture tonight further back.
 
   / Broken connector near Valve Cover
  • Thread Starter
#8  
I go first with water temp sensor, second choice may e oil pressure switch..... Take sensor base out and see what you get....
so the hex bolt in blue circle is what I should remove?
 
   / Broken connector near Valve Cover #9  
so the hex bolt in blue circle is what I should remove?
That’s what I’d remove if it were mine, I think you will find antifreeze once you remove it. I think it’s a coolant temperature sensor, but my wife tells me I’m wrong a lot…
 
   / Broken connector near Valve Cover
  • Thread Starter
#10  
That’s what I’d remove if it were mine, I think you will find antifreeze once you remove it. I think it’s a coolant temperature sensor, but my wife tells me I’m wrong a lot…
Do I need to drain the coolant (don't want it gushing out) before I remove? Looks like it is below the reservoir.

Wait...men are wrong??? That would be a first for me (as my wife hits me) ;)
 
   / Broken connector near Valve Cover #11  
I agree that it looks like a sensor and would highly recommend cleaning the area up before anything else
Getting the broken parts out of the wire connection without damaging it can be fun
When you install the new sensor use pipe dope or Teflon tape not never seize on the threads and a little die-electric grease in the connection boot
Good luck, looks like an easy fix
 
   / Broken connector near Valve Cover #12  
Do I need to drain the coolant (don't want it gushing out) before I remove? Looks like it is below the reservoir.

Wait...men are wrong??? That would be a first for me (as my wife hits me) ;)
It’s probably high enough that not much would come out. Open slowly and go from there is my best advice.
 

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