I need to rebuild the control valve for the rear suspension on my 84 300TDT wagon, and a couple of them appear to be "seized". I sprayed with PB Blaster and tried to loosen after an hour or so. A couple of them came loose, and a couple didnt budge. One of the nuts just started to flatten on the hex sides (I did use the proper flare nut wrench) so I backed off for now.

I sprayed more pb blaster and will continue to do so for the next several days. I will try heating and maybe dry ice, etc. I cant heat too hot because the valve is full of hydraulic fluid.

Any other tips on getting these things loose?



Thanks,

Mark

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1984 300TD Wagon, 407,800 mi (current daily driver)
1985 300DT Sedan, 330,000 mi (gone to that great autobahn in the sky)