Jump to content
Sign in to follow this  
mack88

speedometer

Recommended Posts

Posted (edited)

my 1987 Mack speedometer is acting up gets stuck right over then it work its self back and is jumpy i no cable is new was wondering if its the head or would it be down by transmission.

Edited by mack88

Share this post


Link to post
Share on other sites
Posted (edited)

I would look at the drive on the trans, check check gear for grit or damage and look at the hex in it. That is the easiest place to start. I have seem them wear enough so still work but slip. If that checks out than go to the speedo head itself.

Edited by 41chevy

Share this post


Link to post
Share on other sites

if the needle is deflecting and sticking the problem is in the indicator itself. Probably old grease which has lost it's lubricity qualities, (hard, dry). Not hard to repair but a simple and quick repair is to remove the instrument, submerge in hot water, allow it to heat soak and swish it around quite violently to soften and desolve and dirt/grit internal. This will also loosen/soften the old lubricant, (at times). Follow this up with a double rinse of warm distilled water or a mixture of "Calgon" and tap water to eliminate water spots. Allow to dry or bake in the oven for about 30 minutes at 250 degrees to force dry.

Share this post


Link to post
Share on other sites

Thanks guys.I'll check both.

Share this post


Link to post
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.

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.

Sign in to follow this  

×
×
  • Create New...