Scott,
You didn't say if you started it back up after you tightened the pully.I would
take the pully off and check the key to see if it's broken or damaged the
shaft.Then i would check the flywheel to see if it has come loose as this can
making a knocking sound like a bigend and can also cause the pully to come
loose.If you still have no joy then pull the spark plugs and turn the engine
over till a piston goes thru tdc and starts to move down a little then see if
you can push the piston down with a screw driver or something.If the piston
moves down a bit then this is a sure sign that you have spun a bigend
bearing.Repeat the process on all cylinders.Sometimes the bigend is stuffed but
not that bad and this is hard to detect unless you remove the head or sometimes
until you remove the bearing cap itself.Before you do all this make sure you
check all the valves thru a complete cycle looking for a bent or sticky
valve(check clearance).Good luck.
Andrew Smith
Davidson wrote:
> Ahh the highs and lows of owning a datto. Today is a low :( Took the ol
> 1200 for a spin up to the fuel station to fill her up and on the way back i
> gave it a squirt around a corner. 1st was smokin up pretty hard and 2nd
> never came around. Missed the gear and revved the crap out of the A14.
> Rolled to a stop only to hear a knocking noise from under the hood. Oh shit
> here we go!! Got out and had a look and nothing noticbly wrong except a big
> ass knock. So a crawled home with the engine still running well. There was
> no missing or other noises just a knock. I pulled the rocker cover off to
> check the pushrods, rocker arms, vlaves and valve springs and everything
> looked spot on. I went to turn it over with a shifter on the crank nut (or
> whatever u call it) and it was loose as a goose. I turned the crank over
> and it feels like the crank is sorta loose. Could be the main bearings??
> Time for a bottom end rebuild i think! Just wasnt expecting to do it this
> soon!! Any ideas people??
>
> Scott
> Davo
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