Jump to content
  • 0

How do I flush the radiator and block on this old dog?



Hey everybody first time on Mack forum, I'm working for a farmer and hes got a couple old Mack's that I'm working on and I cant get any info about these old trucks and I was wondering if maybe someone on here could help me out? I dont even know where the block drain is on this truck or the proper way to even flush it to be honest. I found a drain on  the bottom elbow of the main big pipe coming out the bottom of the rad and beside that is a little brass valve; does that valve have anything to do with draining the block? Or do I just drain that plug and it's that easy? The truck is a 1975 Mack RL600L. Any help will do thanks!imageproxy.php?img=&key=a8b8d98f5855eef7

Edited by MBro204
Forgot to add info
Link to comment
Share on other sites

3 answers to this question

Recommended Posts

  • 0

That little brass valve will drain your antifreeze. There probably isn't a drain on block. As far as flushing it out I have used dish soap and water. Run it for a while then drain it and repeat til your water starts getting clearer.

Link to comment
Share on other sites

  • 0

^^This.  The radiator drain will only get the radiator for the most part since the water pump is so high up in the front.  To get the block, look for the drains.  For sure passenger side, I think there is one on the drivers side also?  Maybe, have to check.



1959 B61 Liv'n Large......................

Charter member of the "MACK PACK"


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.

Answer this question...

×   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.

  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Create New...