Jump to content
  • 0

Knock out plugs?


TimmyG

Question

I have a 11 seierra i just took to the shop, they said it has knock out plugs that need removed and will cost extra hour of labor. Does this sound right

Link to comment
Share on other sites

9 answers to this question

Recommended Posts

Core plugs, freeze plugs, and frost plugs I have heard of, knock out plugs is a new one for me. To be honest, I would not have assumed he meant core plugs. 4 year old engine is too young to have a bad core plug. OP looks to be from Ohio, so he has the regular winter, seems odd to be that a shop that has winters with snow does not call them frost or freeze plugs. I can understand a shop in Miami not calling them that.

 

Is this to correct a coolant leak?

 

The core plugs are not there to protect the block from cracking due to no antifreeze in below freezing weather. They are simply there to provide a way to remove the casting sand. Blocks will still crack if the coolant freezes. It will crack at its thinnest point, usually near top of the block under the intake.

Link to comment
Share on other sites

For an alignment? Never heard of such a thing ... :confused:

Link to comment
Share on other sites

Looks like another way they can bilk us out of money ... :nonod:

 

Didn't see anything like that on my '07 when I did the upper control arms last month, aside from the plastic inserts which the alignment place threw away after resetting the camber.

Link to comment
Share on other sites

After reading it was for an alignment, I did some searching(mostly because I have a 2010 GMC) and cannot find any reference to these "knockout plugs" after 2005(although common sense says 2006 and 2007 Classic should be the same). Looking at the link provided above does not give enough detail for me to imagine what they actually do. Seems odd that for decades we managed to get along without this type of device, and had little issue with alignments moving.

Anyone know for sure if these "knockout plugs" still exist, and what do they actually do?

 

I do recall a fair number of manufacturers had some form of adjustment on their McPherson strut front suspension that required new cam bolts and some die grinding(unless struts were replaced already) to alter camber settings. We did charge extra labour for grinding the slots and also for the bolts.

Link to comment
Share on other sites

We call 'em "freeze plugs" out here - sounds about right. If the engine is in the truck still, then that's a damn good deal your getting.

Link to comment
Share on other sites

What are you having done?

 

The aluminum blocks usually have thread-in "freeze plugs" I think. But those aren't removed for anything besides maybe a total rebuild of the engine.

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Forum Statistics

    245.8k
    Total Topics
    2.6m
    Total Posts
  • Member Statistics

    333,234
    Total Members
    8,960
    Most Online
    Donald Dolan
    Newest Member
    Donald Dolan
    Joined
  • Who's Online   2 Members, 0 Anonymous, 957 Guests (See full list)



×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.