tdc

nelly · 15-12-2009, 09:43 PM

there is no top dead centre on pulley wheel.can i find it or is it a pro job.

i l

jinx · 15-12-2009, 10:30 PM

remove the rh side rocker cover remove number 1 spark plug
rotate the pully untill both valves are closed on number 1 cylinder, i always continue to rotate the pully untill the exhaust valve begins to open to be sure your on the correct cycle (there are 2 tdc in a 4 stroke cycle)
so now you know your on the correct cycle, rotate the pully back untill the both valves are closed again, pop a pencil down the spark plug hole continue to rotate the engine backwards and the pencil should be being pushed out of the plughole, be carful, the idea of using a pencil is that if somthing gets jammed then the pencil will brake, not the engine, it also means that you could end up with bits of pencil in your engine!
anyway
rotate the engine until the pencil stops mark that position on the pully, now continue to rotate the engine so you have to push the pencil back into the cylinder to get it to touch the piston, now reverse the rotation so that the pencil is being pushed again, repeat the previous process and mark the pully when the pencil stops
half the distance between the 2 marks is tdc

hope this helps!

nelly · 15-12-2009, 10:45 PM

thanks jinx for quick reply will print it out read it a few times then take it to a pro. i don't think am that confident just yet ,only had bug a couple months .cheers anyway.

jinx · 15-12-2009, 10:53 PM

what are you trying to do?

nelly · 16-12-2009, 05:23 PM

just needed tdc mark for when i check valves

kyle · 16-12-2009, 09:21 PM

u need 2 no bdc as well because 1 and 3 are tdc. 2 and 4 are on bdc !

nelly · 16-12-2009, 10:22 PM

yeah i know 2 and 4 180 and 3 360 degrees its just finding 1 tdc looks like will have to go to. a pro and get the fly wheel marked

kyle · 17-12-2009, 10:58 PM

sounds long winded but borrow some1s with the markings on, take urs off (it aint hard!) put theres on n turn it to tdc. pull theres off put urs on n mark it up! or u cud put them back 2 back cus i dont thin the wudruff key is off-set n mark it that way, u'd still hav 2 take urs off tho! lol

kyle · 24-12-2009, 05:57 PM

i was reading through 1 of my old vworlds n i found ur answer. the woodruff key shud be exacly 90 degrees to tdc.

nelly · 24-12-2009, 07:18 PM

new to bugs if woodruff key is at quart to twelve then you can mark t d c