C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Frozen ZF drain plug

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Old Jul 23, 2005 | 03:05 PM
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Default Frozen ZF drain plug

Are there any tricks to removing a frozen drain plug? I'm stuck!
I think I saw a similar thread to this one awhile back but couldn't find it.
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Old Jul 23, 2005 | 03:50 PM
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Have you tried spraying PB Blaster or some other penitrating oil on it and using a breaker bar with a pipe extension? WD-40 won't cut it. If that doesn't do it, you might try some heat on the case around the plug, but be very careful.
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Old Jul 23, 2005 | 03:58 PM
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Originally Posted by ninetyfivevette
Have you tried spraying PB Blaster or some other penitrating oil on it and using a breaker bar with a pipe extension? WD-40 won't cut it. If that doesn't do it, you might try some heat on the case around the plug, but be very careful.
but be very careful
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Old Jul 23, 2005 | 04:13 PM
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Originally Posted by ninetyfivevette
Have you tried spraying PB Blaster or some other penitrating oil on it and using a breaker bar with a pipe extension? WD-40 won't cut it. If that doesn't do it, you might try some heat on the case around the plug, but be very careful.
I'll give the PB Blaster a try. Unfortunately, at this point there isn't much material to bite into. The inside of the hex fitting had already been rounded out so after applying some heat I got the bright idea to try the vice-grip approach. Next step is the drill and ez-out. First I'll try the PB Blaster. Thanks for the help

Re: "Be very careful" What are the risks aside from setting my car on fire- damage to gaskets or bearings?

Last edited by Fast Eddiz; Jul 23, 2005 at 04:32 PM.
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Old Jul 23, 2005 | 05:24 PM
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Originally Posted by Fast Eddiz
Are there any tricks to removing a frozen drain plug? I'm stuck!
I think I saw a similar thread to this one awhile back but couldn't find it.
First time I took mine out I used a propane torch and warmed the case a little. I also used about a 3 foot bar to break it free. When you re-install it take it easy on the torque. 20 - 25 lbs-ft is plenty.
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Old Jul 23, 2005 | 10:14 PM
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Default Frozen ZF drain plug

Drive the car around and get it very warm- then try to remove it before it cools down very much- that method has worked for me in the past and is a ton safer that using a propane torch on the trans.

Dan
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Old Jul 23, 2005 | 10:42 PM
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Since the hex is rounded out...here is what you do.

Find a bolt with a head that will fit snugly into the hex.

Insert the head of the bolt into the plug, tap it in good to seat it.

From here, you have 2 options:

Attach pipe wrench to the shaft of the bolt and remove...

Or put double nuts on the bolt and then use a breaker-bar to remove.

IF this won't work, go back to step 2 and tack-weld (arc-weld) the bolt to the plug. Don't use a gas torch...

Don't even ASK how I know how to do this...
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Old Jul 23, 2005 | 11:17 PM
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A safer bet would be to weld a nut to the bolt me thinks. Also, be sure to use a Grade 8 bolt or it might just twist.
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