Hello All , I installed a new center support bearing and carrier. The rubber was wiped out in the support upon my inspection last week. As I am making repairs on other things in the last month since I bought the car. Well the bolts were tightened to proper tourq but I thought about some blue lock tight but I did not put it on. This is the first time working with the rubber flex discs so I was not sure if the bolts needed it? Thanks Hans.

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A couple of Ford pickups F 150,250, 350 missed.
1983 240 D 256,000 miles ,auto, ac.

M-B calls for replacing the nuts on the flex disc by saying: "Renew self-locking hex nuts on principle." If the self-locking nuts are in good condition then I would use some blue Locktite on them and torque them to the correct spec (45 Nm or 33.3 ft. lbs. or 400 in. lbs.). I used blue Locktite on the old self-locking nuts for my flex disc and no problems so far.

Good Luck!
Tom

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America: Land of the Free!

1977 300D: 300,000+ miles

American Honda: Factory Trained Technician & Honor Grad.
Formerly:
Shop Foreman;
Technical Advisor to Am. Honda;
Supervisor of Maintenance largest tree care co. in US for offices in Tex.

If you are using factory MB replacement flex discs by Jurid or
one other supplier, bolts supplied with the replacement discs may
have already come with a prestripped form of a faux locktite ECU
cement or they may not have. (Mox/nix.) On the 240D Diesel the
flex discs go for a very long time in comparison to those
models with greater torque and horsepower in excess of 200DIN
which includes practically all 123 series. Guidance from inspection
"C" (I think) calls for the tech to retighten the Num/lb after
1,000 miles; the critical omission is the failure to reinstall new flex
discs properly in their orientations to the driveshaft. The German
phrase on the flex discs translate roughly: "side facing drive
shaft." A commonly voiced objection is that there is no way to affix the flex discs improperly. And this a contributing reason for the wear on the center support bearing plus ancillaries with
tangential vibrations going on the driveshaft itself. Unless this
particular unit is subjected to extraordinarily harsh drivings,
it seems from the inquiry that no unusual looseness from the flex
discs would be expected but to retighten or torque the flex discs
can be done the next time the car is on a lift; earlier if any item
presents itself.

No. You'll get new nylok nuts with the flex disk kit.

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Jeff Naumann
Torrance, California
1972 220D 138k miles (sold)
1982 300SD 263k miles
1989 BMW 750iL 183k miles
1993 Dodge D250 Cummins 5.9 202k Miles