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Distributor messup 140-160

posted by  of122 on  Sat Apr 30 19:08 CST 2022
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last visit: Fri Mar 28 12:17 CST 2014
[RELATED]

I removed the distributor from my 1971 164 and have a question/problem. Piston #1 is at (nearly) TDS and the 10 degree BTDC mark on the crankshaft pulley is at the cast mark on the block. That means the piston is at power stroke,right? Shouldn’t the rotor point at the post for plug number one?








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    posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

    Jim;

    OPs have touched upon the issue, but here it is explained (I hope) a bit more detailed:

    If No 1 is at TDc the Rotor MUST of course point to the No 1 Station so that it can send the Spark there...but if it does not, it is likely likely pointing 180 Deg in the other direction (unless the Distributor Drive was changed), and it means that you are really at TDC of Cyl 6 (don't forget, its a 4 stroke engine, so Timing marks come around on Crankpulley TWICE for every single rotation of Distrib)...simply continue turning Crankshaft in the normal Direction of Rotation, one more rotation, until the Timing mark comes around again...THEN you will truly be at TDC No 1, and can proceed with Static Timing.

    Good Hunting


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      posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

      I’m not good with this. It’s been years since I’ve done stuff on Brickboard. Thanks, all of you, for the information. I determined this before posting: piston one is at TDC, determined by inserting a screwdriver in the spark plug hole. Also, timing marks lined up. Doesn’t that demonstrate that the piston is up at the power/compression stroke?

      I should have put this under my first message, but couldn’t get it to work.



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        posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

        When the #1 piston is at the top,you could be at TDC for #6 or #1.

        There are 2 easy ways to determine if the engine is at TDC for #1.

        As you're turning the engine while watching for the TDC mark on the crankshaft pulley, you can put your finger over the #1 spark plug hole to see if you can feel the motor trying to make compression, if it does, then engine is at TDC for #1

        Or you can watch the rocker arms for #1 through the oil filler cap hole and if the rockers don't move as you are approaching and then getting to the TDC mark, then the engine is at TDC for #1.

        If the rockers move,while approaching the TDC mark on the crankshaft, then you need to turn the engine another 360° to get the engine at TDC for #1.
        --
        Eric
        Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
        Torrance, CA 90502
        hiperformanceautoservice.com or oldvolvosonly.com



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      posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

      Ron answered with more detail them I but the fact is--if you understand the concept--static timing can be set to #6 as well. Just as with a 4 cylinder where the timing mark works for either #1 or #4 as they work in tandem. After setting the static timing it should also be checked running with a timing light. Running at 3-4 thousand rpm it should result in maximum advance of about 30-35 degrees. That test will tell you the centrifugal advance mechanism is working properly. - Dave



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    posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

    “… That means the piston is at power stroke,right? Shouldn’t the rotor point at the post for plug number one?…”

    You’re probably at the end of the exhaust stroke and the beginning of the intake stroke. (You’d have to see what the #1 cylinder valves are doing to be sure.) Remember, the crank turns two revolutions for each time the distributor rotates once.

    Turn the crank one complete revolution and then see where the distributor rotor is pointed.



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      posted by  someone claiming to be on  Wed Dec 31 18:00 CST 1969 [RELATED]

      While #1 cylinder is on its exhaust stroke, # 6 is on its compression stroke and vice versa. #2 and #5 are linked that way and #3 and #4 as well. Your rotor should be pointing to #6. The next full revolution will bring #1 to firing position. - Dave



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