Finding TDC - MustangForums.com



5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 01-06-2004, 06:40 PM   #1
go300mph
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Default Finding TDC



How can I easily determine when #1 is at TDC I can get close ie; the rush of air out the spark plug hole when the piston is coming up but I am concerned the pointer is the wrong one and therefore irrelevant.</P>


How do I make sure it is TDC and not just close.</P>


Mick</P>
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Old 01-06-2004, 07:16 PM   #2
bmorrisj
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Default Finding TDC

stick a screwdriver in the #1 plug hole and whatch as it gets pushed out and no longer moves...btw dont get the scredriver stuck between the piston and the airpump hose...
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Old 01-06-2004, 08:18 PM   #3
mkspeed26
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Default Finding TDC



Quote:
Originally Posted by bmorrisj
stick a screwdriver in the #1 plug hole and whatch as it gets pushed out and no longer moves...btw dont get the scredriver stuck between the piston and the airpump hose...
</P>


where did you get that avitar??? it is the best on the site IMO. </P>


and that works for finding TDC</P>
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Old 01-07-2004, 12:49 AM   #4
n2o44
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Default Finding TDC

are you saying like using a degreeing wheel with the heads on , your just turning the damper , then yeah a rush of air will come out much stronger then the exhaus one . or you can use a stick i guess <IMG src=smileys/smiley2.gif border="0">
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Old 01-07-2004, 02:36 AM   #5
351cleveland4v
 
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Default Finding TDC



To find TDC you can use the screwdriver and stick in the #1 hole and bump the engine over until the piston is all the way up but don't let it go down any or you can stick your thumb or finger over the #1 hole and wait for it to get blowed off the hole but be quick not to let it go down also be careful not to confuse the compression strokewith the intake stroke it will suck onyour finger a littlenot blow it offalso on true TDC both intake and exhaust valves will be closed after finding true TDC take off the distributor cap and see if the rotor points to #1 and check all other timing marks thiswill tell if it is correct be sure to pull off the coil wire so the engine doesn't start and becareful around the hole don't get pinched the chances are slim of getting pinched but play it safe.</P>
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Old 01-07-2004, 02:44 AM   #6
BLKSTANG9879
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Default Finding TDC



You can do the screw driver thing. Or put a tissue on top of the port. When it blows off you got it. But the screw driver thing is alot better.</P>
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Old 01-07-2004, 12:00 PM   #7
go300mph
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Default Finding TDC



I was told of a tool that you screw into the spark plug hole and hand turn the motor over and stop when it bumps into tool, mark balancerthen turn backwards until it bumps again then mark balancer again the point halfway between the two marks on the balancer is true tdc. Anyone know the where abouts of such a tool where can i buy one?</P>


I ask since I have some concern the tdc pointer on my motor is not the correct one.</P>


Mick</P>
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Old 01-07-2004, 02:10 PM   #8
bmorrisj
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Default Finding TDC

wouldnt that make the #1 piston in the down position?
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Old 01-07-2004, 02:56 PM   #9
go300mph
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Default Finding TDC



I think they mean half way between the two points the other way (the short way)</P>


sounds like an easy way to id tdc on your balancer </P>


Mick</P>
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Old 01-07-2004, 03:22 PM   #10
bmorrisj
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Default Finding TDC

no i like my idea better <img border="0" src=smileys/smiley17.gif border="0"> ....

what would happen if TDC was set on the exhaust stroke? <img border="0" src=smileys/smiley5.gif border="0">
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