Join Date: Mar 2004
Location: Chattanooga, TN
Crew Cab Sonoma is offline
Re: Any advice or tips on changing freeze plug?
i know this is an old thread, but in case anybody reads it,
and is tempted to do what the OP did and put grease on
the plug and/or block to help it slip in better, DONT...
the plug is 1 5/8" in diameter, which gives it just over
2 square inches in surface area. whith the lowest
possible coolant pressure it can be expeted to see with a
properly functioning radiator cap is 15 PSI, which means
that just over 30 pounds of force is being applied to the
backside of the plug, minimum...
rev up the engine against a closed thermostat, and you
can easily exceed 20 PSI of coolant pressure inside the
which means there is now more than 40 lbs. of force applied
against the plug, which was lubricated for ease of installation...
i dont think i have to explain what the potential end result
might end up being here....
if you use anything to "lubricate" it for installation, use silicone
sealant. it will help ease with tapping into place, and once cured,
it not only helps to seal it, but also helps to glue it into place.
if its a steel plug, applying a thin coat of sealant to entire backside
of the plug could help protect it from corrosion.
and just to clear up one other thing:
1995 and older blocks had a total of 8 freeze plugs,
1996 and newer blocks have only 4 total...
the '96 model block design changes eliminated the 2 plugs
on the rear face, and the 2 on the front face of the block.
01 Sonoma Crew Cab 4WD 4.3 auto (SOLD)
00 Sonoma Ext. Cab 4WD. 4.3 auto 3.42 Torsen diff. front axle removed. leafspring clamps (anti-hop)"W4M" tune. '06 "989" quiet cam, efans, TB UNmod, 3100 valve springs. 2.13 60ft. 9.52 @ 72.7 mph (1/8 mi.)
95 S-10 2.2. Soon to be DD