929 Timing and Timing Belt

89 929 3.0L SOHC

I replaced the timing belt on the car. Since it had jumped, I wasn't too sure of the timing marks. I do have the shop manual for the car, the small form factor official Mazda book. The pictures for the timing mark on the crank were vague. I ended up using the gear tooth that lines up with the locator pin on the crank. This locator pin is the one the baffle plate, fan belt drive pulley and the harmonic balancer use to line up. I lined up the tooth with the mark on the block. The cam shafts I lined up per the manual, hard to see, but I think I got it right. Did I???

The engine runs well now and started right up after having sat for the winter. After fully warming up I attemped to adjust the spark timing, ooops, as I am typing this, I just remembered, I forgot to short out the green connector to set the timing. I was having trouble setting the spark timing, had to turn the distributor all the way counter-clockwise to get the marks to line up. Now, my original question was could the timing be off due to the old valve timing belt having skipped, BUT, my new question is will forgetting to connect the green connector throw off the spark timing check by a few degrees? Guess I'll have to redo this tomorrow.

Thanks for any advice.

Reply to
john smith
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I did the timing on one of those once, and I did it by ear -- listened for pinging. Though it's hard to hear on this engine.

Reply to
nospam

I'm guessing a little, but I suggest you re-do the timing per the procedure. Adding the jumper probably disables the servo that compares the crank angle sensor with something else (#1 spark plug?) and adjusts the delay to put the timing wherever it is supposed to be at that moment. What you probably did was adjust it out of it's dynamic range, which will likely result in the thing running poorly. Either that or you got the timing marks aligned improperly. If following the correct procedure gets it back in line, then you are done.

Ken

Reply to
KWS

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