1968 390 freeze plug replacement
Thread Starter
|
Junior User
Joined: Jun 2004
Posts: 53
Likes: 0
1968 390 freeze plug replacement
ok guys just wanted to share my work and ask some questions.
my freeze plug (core plug) on the pass side closest to the firewall started to leak. I replaced it with one of the rubber ones. It was a fairly easy job. In my driveway oin my back with basic tools. The question I have was that there was so much grim, really bad grime that came out. It was like a dirty oily lumpy crud. What was it? Just 42 years of miss use? I have had the top half of the engine apart and I am always amazed at how clean it is (on the inside). Do I need to tear it aprt quick????? thanks
my freeze plug (core plug) on the pass side closest to the firewall started to leak. I replaced it with one of the rubber ones. It was a fairly easy job. In my driveway oin my back with basic tools. The question I have was that there was so much grim, really bad grime that came out. It was like a dirty oily lumpy crud. What was it? Just 42 years of miss use? I have had the top half of the engine apart and I am always amazed at how clean it is (on the inside). Do I need to tear it aprt quick????? thanks
Logistics Pro
Joined: Jun 2003
Posts: 3,921
Likes: 272
I always do all of the freeze plugs at once. If one is leaking several are about to. You can remove the thermostat and stick a garden hose in the intake and while the water is flushing, break up the scale and rust with a bendable thin rod through the freeze plug holes and allow it to be flushed out. I don't recommend rubber or steel freeze plugs as they are just a temporary repair. Brass is the way to go. Your local parts house will try to sell you 1-3/4" freeze plugs, the actual size needed is 1-49/64". Sand or clean up the freeze plug bores with emory cloth or scotch brite and apply a thin bead of Permatex Aviation sealer to the sealing surface of the freeze plug prior to installation.
Thread Starter
|
Junior User
Joined: Jun 2004
Posts: 53
Likes: 0
Bobby - thanks. I agree that the rubber one I put on is just temp. I think I will do them all with brass this winter. I think that will be a good time to pull the motor out. How many total do I have 3 per side or 4 per side. I dont think I could do them all with the engine in, well I guess I could just have to be creative.
Senior User
Joined: May 2005
Posts: 218
Likes: 0
From: sw colorado
Hey Bobby, that measurement is good to know. I've got a truck that always looses one of the plugs every year, and I just keep putting one in it from the local parts house. I'll have to try and find one a little bigger. Any idea of a good place to buy them?
Logistics Pro
Joined: Jun 2003
Posts: 3,921
Likes: 272
Any local parts house that carries Dorman products. Dorman part # 565-036
Thread
Thread Starter
Forum
Replies
Last Post
mjpower76
1987 - 1996 F150 & Larger F-Series Trucks
1
Jan 18, 2014 11:14 PM
cabloom300
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
4
Sep 22, 2013 08:11 AM
finneys98xj
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
2
Jan 30, 2011 08:09 AM
