crankshaft
05-29-2009, 08:23 PM
#1
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Join Date: Jan 2007
Location: LA, CA, USA
Posts: 2,593
crankshaft
how can you tel ifl it's good without taking the whole motor apart?
i'm about a buy a whole motor (no head)...the guy said there was something wrong with the piston....but i can spin the motor using my hand (veeery smooth...i spun it using the stator/magneto..not driver/ratchet)...and the pistons go up and down juuuuust fine.
...?
i'm about a buy a whole motor (no head)...the guy said there was something wrong with the piston....but i can spin the motor using my hand (veeery smooth...i spun it using the stator/magneto..not driver/ratchet)...and the pistons go up and down juuuuust fine.
...?
05-29-2009, 09:52 PM
#2
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Join Date: May 2004
Location: Georgia
Posts: 362
Re: crankshaft
Cant diag a crankshaft just by looking at it. Well, no method that I know of at least.
Need to find out the history of the engine. Where's the head? Why was it removed? What led him to say there is something wrong with a piston? Did it eat a valve or just blow a ring? If it did, how?
Really cannot make an educated guess without more information. History is crucial.
If you are doing a complete rebuild, then all will come out at the machine shop. If you are just planning on slapping on a head, then you need more info.
Need to find out the history of the engine. Where's the head? Why was it removed? What led him to say there is something wrong with a piston? Did it eat a valve or just blow a ring? If it did, how?
Really cannot make an educated guess without more information. History is crucial.
If you are doing a complete rebuild, then all will come out at the machine shop. If you are just planning on slapping on a head, then you need more info.
05-29-2009, 10:35 PM
#3
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Join Date: Jan 2007
Location: LA, CA, USA
Posts: 2,593
Re: crankshaft
Cant diag a crankshaft just by looking at it. Well, no method that I know of at least.
Need to find out the history of the engine. Where's the head? Why was it removed? What led him to say there is something wrong with a piston? Did it eat a valve or just blow a ring? If it did, how?
Really cannot make an educated guess without more information. History is crucial.
If you are doing a complete rebuild, then all will come out at the machine shop. If you are just planning on slapping on a head, then you need more info.
Need to find out the history of the engine. Where's the head? Why was it removed? What led him to say there is something wrong with a piston? Did it eat a valve or just blow a ring? If it did, how?
Really cannot make an educated guess without more information. History is crucial.
If you are doing a complete rebuild, then all will come out at the machine shop. If you are just planning on slapping on a head, then you need more info.
the "story":
the guy i bought it from had a FI cage on his motor, dropped it, and broke the left side of his crankcase along with stator cover...so he bought this motor from another guy so he can take off the crank-case and put it on his motor.
the other guy told him there was something wrong with a piston...that's supposedly all he know.
but if the motor turns/spins...doesn't that mean the crankshaft/pistons are fine?
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