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Username Post: 283 block drain plugs        (Topic#357501)
Beltfed 
Poster
Posts: 43

Reg: 10-04-18
08-03-19 12:10 PM - Post#2772318    

Have to replace freeze plugs on bottom of engine. Are there drain hole in the block to remove radiator fluid? If so, where would they be located? Thanks.



 


Bubpletop62 
Poster
Posts: 95

Loc: Bakersfield, CA
Reg: 03-21-06
08-03-19 02:25 PM - Post#2772330    
    In response to Beltfed

Yes. One each side of block mid way back under exhaust pipe. It is a pipe thread plug. Be careful in removing this plug as it usually is very rusted. I replaced both mine with a brass pet cock like the one on the bottom of the radiator drain so you can drain water easily. BTW, replace any freeze plugs with brass ones. They will not rust out like the original steel ones did. Good luck.
Dennis Bubp

Dennis Bubp
'62 Belair Sports Coupe
drbubp@hotmail.com


 
junky 
Valued Contributor
Posts: 3161

Loc: Northeast CT
Reg: 06-27-10
08-04-19 03:17 PM - Post#2772410    
    In response to Beltfed

Whenever I found a leaking freeze plug, I would drain the radiator, and put in some radiator and block cleaner, and do that a few times. Many times, it would remove the rust on other freeze plugs, and tapping on them lightly with a screwdriver and hammer would prove that they were going to be failing soon, so I would replace them also. The biggest problem is the freeze plugs at the back of the heads and block. Those would require removal of the engine. Never an easy choice, to remove the engine and do them all or just those that have failed. Age has a habit of causing many problems, and in my mind it is better to fix it once, rather than one at a time.

Never argue with an idiot. He'll drag you down to his level, then beat you with experience.


 
YOUNG57 
Frequent Contributor
Posts: 1157

Loc: Tennessee
Reg: 12-06-10
08-04-19 05:17 PM - Post#2772416    
    In response to junky

Gravity causes rust and debris in the cooling system to collect in the bottom of the water jackets along the bottom of the block. It solidifies into muck behind the drain and casting plugs and will cause them to rust.

It is best to remove the drain and casting plugs if it is an old unmolested block or this has happened. Then dig out the muck with screwdriver or hooked coat hanger end from both the drain plug and casting plug holes and flush with water before replacing with new brass ones.

The casting plugs on the back of the block behind the flywheel / flex plate do not usually suffer from this issue since they are not at the bottom where muck accumulates.




 
niftyfive 
Member
Posts: 183

Loc: Durango, Colorado
Reg: 02-07-05
08-08-19 04:24 PM - Post#2772742    
    In response to YOUNG57

When installing new freeze plugs, you may be tempted to use a large socket. This will deform the interference wall of the plug so as to not seal properly. Need something that contacts the edge of the seal.
Jim

NIFTYFIVE


 
YOUNG57 
Frequent Contributor
Posts: 1157

Loc: Tennessee
Reg: 12-06-10
08-08-19 05:10 PM - Post#2772751    
    In response to niftyfive

  • niftyfive Said:
When installing new freeze plugs, you may be tempted to use a large socket. This will deform the interference wall of the plug so as to not seal properly. Need something that contacts the edge of the seal.
Jim



Such as a bigger socket.



 
niftyfive 
Member
Posts: 183

Loc: Durango, Colorado
Reg: 02-07-05
08-08-19 06:01 PM - Post#2772759    
    In response to YOUNG57

Maybe not, most sockets have a round lip that wont provide the correct interface. You can buy a tool or make one by cutting the lip down square on the correct socket.
https://www.summitracing.com/search?SortBy=BestKey ...

NIFTYFIVE


 
Beltfed 
Poster
Posts: 43

Reg: 10-04-18
08-15-19 03:36 PM - Post#2773266    
    In response to niftyfive

Too late. I used a large socket but not on the lip. If the plug behind the starter starts to leak, I will seriously do consider scraping it.



 


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