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PostPosted: Fri Aug 05, 2022 6:47 pm 
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3 Deuce Webber
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Joined: Wed May 02, 2007 4:03 pm
Posts: 62
Location: Passssssssadena, California
Car Model: 1981 B-150 original California short passenger Van
To my amazement, i cannot find a tightening spec in the factory service manual for the engine’s coolant block drain plug. Looked under both Engine and Cooling System sections. A search here on Sl 6.org brought up nothing.

This is for a 1981 hydraulic lifter 225 Slant 6. Here’s the plug:
Attachment:
block coolant drain plug Sl6org.jpg
block coolant drain plug Sl6org.jpg [ 22.89 KiB | Viewed 72 times ]


I’m measuring 1/2" O.D. Head mates with a 9/16" socket. Didn’t have small enough pipe fittings to try and fit, but it looks like it might match a 1/4" I.D. NPT pipe.

Apparently last time it was out i just winged it when i put it back.

Anyone know the proper torque?

_________________
1981 B-150 short Van, stock 225, California emissions package, Electronic Spark Advance (digital Lean Burn), Non-feedback Holley 1945, AT
Driven for economy, not for speed.


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PostPosted: Fri Aug 05, 2022 7:03 pm 
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Turbo EFI
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Joined: Mon Jan 12, 2015 5:55 am
Posts: 1292
Location: Brightwood, VA
Car Model: 1965 Plymouth Belvedere I
I thought that those were pipe thread. If it is, I don't think there is a torque value for it.

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-MattMan
LEANED & MEAN
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PostPosted: Sat Aug 06, 2022 5:47 am 
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Turbo EFI
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Joined: Wed Oct 12, 2005 9:00 pm
Posts: 2388
Location: kankakee IL
Car Model: 80 volare, 78 fury 2 dr, 85 D150
I've had lots of those out, never torqued one w/a torque wrench yet.
And yeah they're pipe thread
I put petcocks in that hole like what's on the bottom of the radiator


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