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Thread: 68 911L smog pump

  1. #1

    68 911L smog pump

    Does anyone know the correct procedure for removing the smog pump. IE: hotter or colder plugs, timing etc, etc. Thanks

  2. #2
    To borrow the standard repair procedures from the old Motor Manual DIY books:

    1. Open hood
    2. Remove smog pump
    3. Reverse the above procedure


    Not having done this personally, I would suspect you would remove, in addition to the pump, mounting bracket and belt, the attached hoses and tubing, then plug the air inlets on the exhaust manifold. If different, I'd suggest using spark plugs with a heat range for a non-pump engine with carbs (e.g. NGK BP-7ES). To be really thorough, connect an exhaust analyzer and chart the air/fuel mixture throughout the rpm range (preferably under load), then rejet as necessary.

  3. #3
    My car had the pump removed before I got it. All the brackets were gone, the injector things in the heads were welded shut, and the chain cover had a steel patch over the hole, and the drive end of the cam had been removed, it looked like it was broken off. Later I removed the cam and cut the rest of the stub off and replaced the cover with a standard one. I run plugs one hotter than what is spedified by NGK. I think I need the hotter plug because my engine is old and I'm getting some blow-by and I'm running a little rich. I run stock timeing.


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