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#25770 11/05/2003 4:15 PM | Joined: Nov 2003 Posts: 236 Shop Shark | | Shop Shark Joined: Nov 2003 Posts: 236 | This may sound like a dumb question but, if you don't ask you don't learn. How do you change a freeze plug? Seems to me that just popping them in wouldn't be enough to withstand the pressure built up in the block. | | |
#25771 11/05/2003 4:45 PM | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | GEC52
Some people put a little sealant around the edge of the engine casting/freeze plugs before they press/punch them in. The engine coolant should not be under much pressure in a Chevrolet 216/235/261 truck engine's cooling system (0 to 4 lbs in a truck engine and up to 7 lbs in the later 235 car engines). I do not know if the same goes for GMC 6's.
Tim | | |
#25772 11/05/2003 5:21 PM | Joined: Jan 2000 Posts: 206 Member | | Member Joined: Jan 2000 Posts: 206 | Getting the old plugs out can be the worst part, if the engine is in the truck with all the manifolds attached. Use brass replacements (from any Dorman dealer) if available. Sealant is a good idea. NAPA makes a tool to install new plugs, but a hammer handle will usually suffice. Just get it started straight and then pound it in. | | |
#25773 11/05/2003 5:23 PM | Joined: Jun 2000 Posts: 2,773 'Bolter | | 'Bolter Joined: Jun 2000 Posts: 2,773 | Also, there are two styles used on the older GM products. I use gasket dope, such as Permatex #2 or Indian Head Shellac with both.
One is a disk that has a curve to it. Place it in the hole, dented side out, and drive it in until it flattens. That expands the disk to fill the hole.
The other has a flat base with the edge bent straight up.
Put it in so the cup is open to the outside and drive it in. It's a tight fit, but drive it in until it's seated.
Fred
52 3600
69 C-10
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#25774 11/05/2003 6:43 PM | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | I believe that the plugs that are shaped like a cup, go into holes that have no ridge. That is to say that if you drive it in it will simply end up in the water jacket. The way to remove these is to use a dull chisel and drive it on the side to turn the frost plug. Then you grab it with pliers and pull it out. | | |
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