Seized thermostat bolts

[jpopp]

Went to take off housing last year and couldn't loosen bolts. Really don't want to bust them off, anybody ever have this problem or know what I can try that will put force on bolt with least risk of busting it. Tried WD-40, that is about it so far.

 

[metwrench]

Re: Seized thermostat bolts

HEAT...HEAT....HEAT....BUT ! Dont heat around the bolt like you think, Heat the BOLT !! The head of it...then when its Hot, Tap the Head of the bolt and Vibrate it. Wait a little till it cools back off and gently try and Move the bolts...see if that works.<br /><br />Bagging and Tapping on the bolt head can cause it to jar loose. <br /><br />ALWAYS remember to use Ani-sieze Compound and Stainless Bolts when you replace it. Next time they will walk right out !

 

[Boomyal]

Re: Seized thermostat bolts

You might as well use water as to use WD40 as a penetrant. Get something serious like Liquid Wrench or PB blaster. Once you have liberally applied it start by rapping on the bolt using a drift punch. That will help break loose the rust holding the bolt. You may have to apply and rap numerous times over several days before they let loose.<br /><br />Also, if you have a propane torch and can carefully apply heat, just to the bolt head then quench with cold water, the expansion and contraction will aid in loosening the bolts. <br /><br />Sometimes patience is the key.

 

[anesthes]

Re: Seized thermostat bolts

impact-gun is your friend.<br /><br />Low setting normally vibes anything loose.

 

[elpaso]

Re: Seized thermostat bolts

AS John said heat and taping bolts works.<br />Propane is not hot enought.<br />Acetylene and oxygen torch will work<br />great. If not available - napp gas and oxygen<br />torch kit with small cylinders are avaiable<br />from any Home Depot for about $40.<br /><br />Take your time reheat and quench 5-6 times.<br />An impack may break bolts - $40 bucks will<br />then sound cheap.<br /><br />wd-40 is worthless for anything.

 

[mikeneal]

Re: Seized thermostat bolts

As everyone says use heat and impacts works better. Also I have found PD balster the best for freezen bolts.