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A jammed or broken tooth on a gear will cause cracking sound. And will continue until you shut off power. The reason the sound continues is because it's still in the process of scanning and hasn't reached the white tape which the sensor senses to return to the finished position. An HP scanjet just as its printers don't have a sensor to stop the carriage from moving until the job is completed. Further use will ultimately cause a loud pop and cause further damage.
The white smoke is probably steam caused by coolant getting into the cylinder(s) either from a faulty head gasket, cracked cylinder head or cracked engine block. The loss of heat from the heater indicated that coolant was being lost..
This sounds like it had water left in it and it froze over the winter. The motot turning on and off signals a water leak on the output side of the pump. You may have a cracked pump housing. Locate the pump and make sure nothing is leaking in that area when under pressure. looh for fine hairline cracks.
I,d probably do a compression check on this old girl. sounds like she needs some attention to the top end.The valve stem seals sound like there spent.Oil is seeping past the seals into the combustion chamber and being burnt off,thus explaining the rough idle and white smoke at start-up and dissipating as the engine warms up.Probably time to spend a bit of coin keerossi.Think of it as an exchange, money for thrills.hope i've helped you out a bit....tabby...OZ
sounds like you might have a cracked cylinder and oil puddled up inside over night and when you started it..it blew out through the exhaust. White smoke means oil...black smoke means gas ,and blue smoke means both..if you cracked a water jacket your oil will look like a bubbly milk shake.....take a look at your oil.
did they have the cylinder checked for cracks and have it machined before they put the new gasket in? you may have a cracked head or whoever did the gasket did not machine the head, was badly warped and is not sealing the new gasket properly. this may also explain the noise you are hearing, could be the cams binding in the head. Please find out if the head was machined or checked for warpage and cracks, pull the plugs and look down into the cylinders you will be able to tell which is consuming coolant because the top of the piston will be very clean and the others will have deposits, also look at the spark plugs and see which is wet and white colored do this check after the car has cooled down for awhile but not dead cold.... please rate -jeff BTW if you live near CT i am always available for side repair work i am ase certified