I am in the process of rebuilding the climate control servo for the wife's
'79 300TD. I have 2 servos from which I hope to make one good one. The
good upper unit, which houses the gear train has a machine screw sheared
off at the surface of the plastic housing. Who knew that about 1/4 of
screw threads in the plastic would hold well enough to shear an 8X32 screw
(even AFTER soaking with PB Blaster!)? Drilling it out did not seem like a
good option because of the softness of the surrounding plastic, nor is the
blue wrench usable.
Battery acid didn't do much. My next try is a saturated solution of alum
with an overnight soak. I have read reports that this will dissolve steel,
and I know it won't hurt the plastic.
If anyone has an interest, I'll report how it turns out!
Greg Fiorentino
'85 300SD
'80 240D 4 spd. manual
'79 300TD (with new crate engine)
'95 and '97 Crown Vics
'97 F-250HD Crew Cab 7.3 Powerstroke
-Original Message-
From: mercedes-boun...@okiebenz.com [mailto:mercedes-boun...@okiebenz.com]
On Behalf Of LarryT
Sent: Thursday, October 15, 2009 11:41 AM
To: mercedes@okiebenz.com; 911/993/996
Subject: [MBZ] Penetrating Oil Test
Found this on a MGB list I'm on. Don't know how scientific it is but it
seems convincing.
Here's some interesting
comparisons on penetrating oils.
Machinist's Workshop magazine actually tested penetrates for break-out
torque on rusted nuts. They arranged a subjective test of all the popular
penetrates with the control being the torque required to remove the nut from
a
scientifically rusted environment.
*Penetrating Oil and Average Load*
Nothing. 516 pounds
WD-40... 238 pounds
PB Blaster 214 pounds
Liquid Wrench. 127 pounds
Kano Kroil... 106 pounds
ATF-Acetone mix. 53 pounds
The ATF-Acetone mix was a home brew mix of 50-50 automatic transmission
fluid and acetone. Note the home brew was better than any commercial
product in this one particular test. Note also that Liquid Wrench is about
as
good as Kroil for about 20% of the price.
Take care -
Larryt
74 911
91 300D
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