Question about 1993 Chevrolet Suburban

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Freeze plug replacement

Can the lower right freeze plug be removed and replaced without pulling the engine out.
rich heath

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  • skyejetski1 Apr 05, 2009

    I have a marine Mercruiser engine that lost a freeze plug behind the motor mount.  There are four mounts.  It looks like the mout is connected to the hull with 1 large nut/bolt and two bolts on the engine.  If I remove just that motor mount will the engine fall? Do I need to support it somehow besides a custom cut 2X4 wedged in between the motor (next to the mount) and the hull?  If this works it will allow room to install the plug with a socket and seat it correctly.  Thoughs or comments?

  • Anonymous Mar 30, 2014

    How to replace freeze plug on back of engine



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Hi, yes it can be when you remove motor mount and bracket, starter and exhaust manifold.

Posted on Dec 02, 2008


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I have a 02 Mercury sable. I need to replace the freeze plug on the end. I was told the tranny has to be removed. Is there any other way to get to it, without removing tranny?

probably not --- engineers are not cooperative in that manner and freeze plugs ( welsh plugs ) are in the most inconvenient positions
best advice here is if one is rusted out then the rest are close behind and if you have to pull the transmission , rather pull the engine , put it on an engine stand and do the lot as the others are in bad spots as well

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Do I have to pull the engine to replace the freeze plugs?

if you can physically access them, no you would not have to remove the engine, but given the orientation of the motor and trans I highly doubt you can get to all of them without pulling the engine....also I must ask, why do you need to do this? unless the are leaking... typically these should no need replacing unless they have popped out due to the block freezing..

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If you are wanting to replace the factory freeze plug with a similar type, I'm afraid that the easiest / only way is to pull the engine.

What some people do is replace the factory style freeze plug with an expandable rubber plug. The plug has a bolt through it and as you tighten the bolt/nut the rubber expands sealing the hole. If you can get the plug out, you can replace it with this style without having to remove the engine. You only need enough clearance to get a wrench on it. Be sure to check the plug for the first few months as sometimes they get loose as the rubber "settles" in.

If you don't want to replace with a expanding rubber plug what you might can try is supporting the engine using a jack and removing the engine mount and the engine mount bracket. That "might" give you enough room to work but I doubt it. There probably isn't enough clearance to get a hammer or a metal rod to the plug.

When removing the freeze plug be careful not to accidentally knock it into the engine block. THAT is a real PITA.

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