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No, you do not want to replace the crank pulley with a solid one. The hub is also know as a Harmonic Balancer. The explosions that happen inside of your engine cause vibrations or harmonics, the balancer greatly reduces these vibrations. Without the ruber insulating ring the harmonics can cause part failure at certain frequencies.
What kind of bang, like an explosion?
if so, then a burner orifice or more than one orifice or the burners, are plugged.
What is happening, raw fuel is not reaching hot surface igniter quick enough.
The raw fuel then collects from a further orifice, and by the time that it reaches the hot surface igniter, there's a little bit too much fuel, and there is an explosion. Which is not normal.
You need to clean the orifices and the main burners.
If you are getting spark to the plugs and fuel spray, and you have compression and the spark is at the right time, you should have explosion. Is it possible the valve timing is off - timing chain issues ? Are the new plugs fuel-fouled ?
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What is the difference in the sound when it engages and when
it does not?
What does engage mean to you.
To me it means a loud click sound followed by the engine cranking.
Actually engage is just the click sound.
Cranking is the small electric starting motor forcing the engine to move as if
it were actually running. Once it moves just a bit a spark plugs fire and the
resulting explosions makes the engine keep going until one of the following
happens. Loss of air/fuel mixture (i.e. run out
of gas or air intake blocked) Loss of spark (i.e. battery low or dead,
bad coil, bad plugs) The two above do not come together at
correct time (timing) Something physically stops the engine
from continuing to operate (engine seizes, too much load)
If battery is low starter will not engage or crank.
If electrical connections are bad (usually loose or dirty)
current will not flow properly and starter will not engage or crank.
Both can be checked with a multi meter.
Measure battery voltage when attempting to start.
It should be 12-13.2 volts and should not drop below around 10
If it is not dropping but still not engaging/cranking,
continue to take voltage readings move from battery toward the starter. When
you find a sudden voltage drop, investigate wiring just before that point
upstream toward the battery.
This sounds like a timing problem, try turning your distributor a little bit and the other thing to try is adjusting your ful mixture, but I would adjust the timing ( distibutor ) first.
Good luck and I hope that you take the time to rate this site.
You might try connecting only one speaker at a time and see if you can
locate a bad speaker OR bad output channel that way. If you find
that you connect one speaker and the problem occurs then try another
working speaker and see if it still does it. If it does, then you
have an output problem. Good luck.