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View Full Version : how do i check crank twist??


djcondo
01-26-2009, 08:34 PM
I tried to use the search to figure this out but could not find an answer. Does somone know the method if checking crank twist without tearing the engine apart? some one mentioned that it can be done with a pencil and a tape measure.
thanks for the help
mrviper700
01-26-2009, 10:53 PM
easiest way is to use a degree wheel and mark each cylinder at tdc, should be exactly 90 degrees between them each at tdc. You use a piston stop and mark each side of stopped TDC on degree wheel,then spilt it thats your true TDC, again you do this for each cylinder and you can check the phase of the crankshaft no matter if its a 2,3,4,engine.
djcondo
01-27-2009, 12:38 AM
what if i dont wanna take it all apart or cant because its one i might buy?
djcondo
01-27-2009, 04:32 PM
can it b done without taking the engine apart?
mrviper700
01-27-2009, 04:50 PM
yes, what I described to you is simply using a piston stop screwed into the spark plug hole, and the degree wheel mounts where your clutch goes on.
daman
01-27-2009, 06:34 PM
read the "how to check your crank" part


http://www.vmax4.com/vbulletin/showpost.php?p=36142&postcount=6
djcondo
01-28-2009, 10:27 AM
yes, what I described to you is simply using a piston stop screwed into the spark plug hole, and the degree wheel mounts where your clutch goes on.

ok thanks, sorry for the confusion
djcondo
01-28-2009, 10:29 AM
read the "how to check your crank" part


http://www.vmax4.com/vbulletin/showpost.php?p=36142&postcount=6

Thanks man this was the thread that i was looking for.
applecider
01-29-2009, 03:40 AM
The way these guys describe how to check I'm sure is more accurate but a quick and easy way is to put #1 cylinder at TDC #3 and 4 should both be exactly half way
JAMIE
01-30-2009, 07:43 PM
just a note with this thread is that you cannot install a degree wheel on the PTO shaft since it's not 1:1 with the crank,I believe it's .95:1 . Your reading will not be accurate.You must somehow mount it on the crank directly.
mrviper700
01-30-2009, 11:22 PM
Sure you can jamie, Your right, I didnt say that just add the differance to your degrees. .976-1.1+.024

most times when you degree an engine it will be on the bench, either mounted via flywheel,or crank snout, but you can do a quick check in chassis if one thinks he twisted crank or had it move..