Jump to content

Oil Leak At Pressure Sending Unit

Recommended Posts

This is not a MJ issue.  It is for my 84 CJ7, 4.2.  I bought it last Sept.  I have noticed the tell-tail signs of a Jeep marking its territory. 


Following the advice on CC.com, I did not want to go to the RMS right away.


I was working on it while it was running.  I looked for where it was leaking and found it was coming from the oil pressure sending unit.  The FSM doesn't have any info on it.  At least, I did find anything.


Is there an O ring where it threads into the block?  Is it silcon taped? 


Part numbers?


Thanks in advance.

Link to comment
Share on other sites

If I had to guess, the sending unit threads are NPT (national pipe thread) which means tapered and should seal when threaded together with another NPT, in this case a hole WITHOUT using any type of sealant.  (We could get into NPT and NPSC mating threads but there's not point here.)  I would take the sending unit off and examine the threads.  If they're pipe thread I would slather some pipe dope on the threads and screw it back together.  Now if the threads are not tapered but have a thread relief groove where the threads end on the sending unit, then it might need an o-ring.  You might take it off and post a pic here so others could chime in.  A pic is worth the effort.

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.

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.


  • Create New...