Quote:
Originally Posted by rcounts
You got a picture of this thing? What year/model of car? I'm not following what you're saying about "gear teeth" on the adjusting bolt.
My 84 300CD has a pivot bolt with a 17mm head, and another bolt through the slotted adjustment bracket with a 17mm head on it. The one through the slotted bracket also has a threaded rod welded to the head that goes to a 13mm adjusting nut that fits into another slot on the bracket - so that adjusting the 13mm nut pulls on the rod to pull bolt and adjust the belt tension. I just did this adjustment yesterday in fact. It was a real PITA, because to even get to it I had to remove the intake snorkel and turbo u-tube.
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There should be three 17 mm that need loosened and tightened on the 83-84 timeframe: the lower one lets the alternator pivot, the upper back one lets the bracket pivot and the third closer one adjusts the tension on the belt as the geometry from the other two shifts.
A 17 mm ratcheting box end is good to have. You should be able to get to it just by removing the air-tube to the air filter.
Also, make sure the washers are on the front and back of that bracket. The rear nut on mine was "ground in" to the bracket so much I had to pound the bracket flat and file the burrs and the nut had a wear groove. I saw another one just like that at the junkyard, so I'm guessing a lost rear washer isn't uncommon.
I think some 240's use a similar setup, but the bolt goes rear-to-front and the front-inboard "nut" is actually welded to the bracket.
Note: this is probably NOT what the OP is asking about, but refers to the 90-degree adjuster, not the gear tooth adjuster.
07-26-2010, 08:06 PM
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