Pagoda SL Group
W113 Pagoda SL Group => Drive train, fuel, suspension, steering & brakes => Topic started by: ctaylor738 on November 16, 2013, 15:39:51
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My four-year 280SL project-in-a-kit is finally "almost" finished. I took it for its 20 mile first drive a couple of days ago and when I put it back in the garage I noticed a serious puddle of oil where it had been sitting. I checked it out and found that oil was dripping off the idle mixture adjusting knob on the back of the injection pump. I took the adjuster assembly off and found that half of the o-ring that seals the adjuster shaft had gone missing.
This o-ring sits in a recess on the inside of the plate that holds the adjuster and is held in place by the tension of the spring. I replaced it with a 4 x 1.6 mm o-ring, and no more leak.
I highly recommend replacing this piece if you have the adjuster off the pump or if you are installing a pump.
Cheers,
CT
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Thanks for the tip CT!
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You are so right Chuck. Mine was leaking as well and had to replace it. Easy to do once you have it apart. I went a little further and used a Viton o-ring. The standard Nitrile (buna-N) o-ring is OK and resists oil, but has a limited temperature of 225-250*F. So over time, it hardens and will leak. Viton is highly chemical resistant and resists heat to 400*F. Yes it is more expensive, but on that small of a part, its only pennies.
If this was a static o-ring (meaning it never moves), Nitrile is OK. But it does become unseated everytime you make an adjustment.
One more tip along this line. Everytime you press the adjuster in, a little bit of oil drips out. I always take an oil rag and wipe the bottom side of the adjuster when I make an adjustment. A little over-the-top I know.