How do I find top dead center?
01-16-2005, 07:10 PM
#23
3.0 BAR
Join Date: Mar 2003
Posts: 21,479
Re:How do I find top dead center?
Geez, you'd really have to put a gouge in that piston to affect anything. :P
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01-17-2005, 10:57 AM
#24
1.5 BAR
Join Date: Aug 2004
Posts: 949
Re:How do I find top dead center?
Originally Posted by AbaZ
Scratching the pistons with a screw driver? lol.. come on man, people have used that trick forever. It's not going to scratch anything. Just rotate the engine over until the screw driver comes to the highest point, make sure the cam is at the correct mark too (align the cam gear to the head) So its not 180 off.
01-17-2005, 11:19 AM
#25
0.5 BAR
Join Date: Dec 2002
Posts: 154
Re:How do I find top dead center?
How about the 'right' way? 
Take a long dial indicator, and rotate the crank counter clockwise until the dial indicator stops rising. Mark that spot. Then, rotate the crank the other direction(clockwise), until the dial indicator stops going up again, and mark this spot. True TDC, is directly between these two marks. If you don't do it this way, you'd be surprised at how far off 'true' TDC can really be, especially when using the screwdriver trick (it can get close though, no doubt... i've used it many-a-time)...
But that paper towel "trick"... is for the birds. Don't trust your engine to anyone that relies on the paper towel popping out to set TDC
Take a long dial indicator, and rotate the crank counter clockwise until the dial indicator stops rising. Mark that spot. Then, rotate the crank the other direction(clockwise), until the dial indicator stops going up again, and mark this spot. True TDC, is directly between these two marks. If you don't do it this way, you'd be surprised at how far off 'true' TDC can really be, especially when using the screwdriver trick (it can get close though, no doubt... i've used it many-a-time)...
But that paper towel "trick"... is for the birds. Don't trust your engine to anyone that relies on the paper towel popping out to set TDC
01-17-2005, 12:58 PM
#26
Administrator
Join Date: Dec 2002
Posts: 13,991
Re:How do I find top dead center?
More common to have a screw driver in the average persons toolbox than a long *** dial indicator 
Really if you want to get picky, just pull the front timing cover and align the front crank gear to the mark on the oil pump and you know your dead on.
Really if you want to get picky, just pull the front timing cover and align the front crank gear to the mark on the oil pump and you know your dead on.
01-17-2005, 01:45 PM
#27
3.0 BAR
Join Date: May 2003
Posts: 5,380
Re:How do I find top dead center?
Originally Posted by AbaZ
More common to have a screw driver in the average persons toolbox than a long *** dial indicator
Really if you want to get picky, just pull the front timing cover and align the front crank gear to the mark on the oil pump and you know your dead on.
Really if you want to get picky, just pull the front timing cover and align the front crank gear to the mark on the oil pump and you know your dead on.
serious! you guys are making it more difficult than it really is.assuming the belt isnt on the cams or on the crank rotate the crank till you get the single otch on the mark for the bottom end. then align the cam gear to its specified TDC position put belt back on and tighten it. done! now rotate the crank and make sure its nice and tight and on the mark!
BTW valve lash adjustment is 180 degrees at a time and di it 1-3-4-2 or else you wont have it done right.
good luck
The crank rotates 2x for every cam turn
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