how do i find TDC on new motor to put in dist.
#2
Supreme Member
Joined: Dec 1999
Posts: 1,237
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From: Reno, NV
Car: yep
Engine: uhuh
Transmission: sure does
Pull #1 plug, put finger in plug hole.
Rotate engine (clockwise)until you feel air start coming out of cylinder.
Look at timing marks and continue to rotate until the marks line up at TDC.
Drop dist.
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ASE Mechanic/Machinist/Smog Tech
1999 NBM Trans Am
1986 Chevy 3/4 ton pick up
1981 corvette
1995 Kawi ZX6R
and 2 POS commuters...
R.I.P. #3
"He can see air"
Rotate engine (clockwise)until you feel air start coming out of cylinder.
Look at timing marks and continue to rotate until the marks line up at TDC.
Drop dist.
------------------
ASE Mechanic/Machinist/Smog Tech
1999 NBM Trans Am
1986 Chevy 3/4 ton pick up
1981 corvette
1995 Kawi ZX6R
and 2 POS commuters...
R.I.P. #3
"He can see air"
#3
Moderator
Joined: Jan 2000
Posts: 20,981
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
<font face="Verdana, Arial" size="2">Originally posted by Engineboy:
Look at timing marks and continue to rotate until the marks line up at TDC.</font>
Look at timing marks and continue to rotate until the marks line up at TDC.</font>
#4
Senior Member
Joined: Nov 2000
Posts: 762
Likes: 2
From: Riverside, CA
Car: 1987 Camaro IROC-Z
Engine: 305TPI
Transmission: 700R4
they would have to be correct, unless he's using an aftermarket timing cover or he has a slipped harmonic balancer..
i wouldn't do the finger in hole waiting for compression trick.
Take off the driver side valve cover, that's a piece of cake to do.
Using a strongarm (long bar with a socket on it) rotate the engine while you watch the #1 cylinder intake and exhaust valves.. the exhaust valve is the front one, intake is the 2nd from the front. Rotate the engine over, watching the #1 valve (exhaust) open and close. You will then see #2 valve (intake) open and then close. When the #2 valve starts to close WATCH YOUR BALANCER. You will see the line starting to come around. Stop at 0 and you're set.
This of course is assuming that you do not have a slipped balancer, in which case you should do the "finger in hole" trick.
Remember the four strokes, intake, compression, combustion exhaust.
Going by that, the exhaust valve should be closing while the intake valve starts to open. Close the exhaust and as soon as the intake closes it's at, or very close, to #1 cylinder TDC.
Hope this helps.
I'm also giving you 2 links to tech articles I've written on this subject.. if you need more help email me at admin@IROC-Z.org
http://www.iroc-z.org/tech/distribut...ngdistrib.html
http://www.iroc-z.org/tech/distributor/settingtiming
good luck!
Colin
------------------
Webmaster: www.IROC-Z.org
i wouldn't do the finger in hole waiting for compression trick.
Take off the driver side valve cover, that's a piece of cake to do.
Using a strongarm (long bar with a socket on it) rotate the engine while you watch the #1 cylinder intake and exhaust valves.. the exhaust valve is the front one, intake is the 2nd from the front. Rotate the engine over, watching the #1 valve (exhaust) open and close. You will then see #2 valve (intake) open and then close. When the #2 valve starts to close WATCH YOUR BALANCER. You will see the line starting to come around. Stop at 0 and you're set.
This of course is assuming that you do not have a slipped balancer, in which case you should do the "finger in hole" trick.
Remember the four strokes, intake, compression, combustion exhaust.
Going by that, the exhaust valve should be closing while the intake valve starts to open. Close the exhaust and as soon as the intake closes it's at, or very close, to #1 cylinder TDC.
Hope this helps.
I'm also giving you 2 links to tech articles I've written on this subject.. if you need more help email me at admin@IROC-Z.org
http://www.iroc-z.org/tech/distribut...ngdistrib.html
http://www.iroc-z.org/tech/distributor/settingtiming
good luck!
Colin
------------------
Webmaster: www.IROC-Z.org
#5
Supreme Member
Joined: Dec 1999
Posts: 1,237
Likes: 1
From: Reno, NV
Car: yep
Engine: uhuh
Transmission: sure does
<font face="Verdana, Arial" size="2">Originally posted by ColinOpseth:
i wouldn't do the finger in hole waiting for compression trick.</font>
i wouldn't do the finger in hole waiting for compression trick.</font>
If the balancer ring has slipped, either way you do it , the marks will be off TDC.
If the balancer is good, there is no difference.
------------------
ASE Mechanic/Machinist/Smog Tech
1999 NBM Trans Am
1986 Chevy 3/4 ton pick up
1981 corvette
1995 Kawi ZX6R
and 2 POS commuters...
R.I.P. #3
"He can see air"
[This message has been edited by Engineboy (edited July 15, 2001).]
#6
Senior Member
Joined: Nov 2000
Posts: 762
Likes: 2
From: Riverside, CA
Car: 1987 Camaro IROC-Z
Engine: 305TPI
Transmission: 700R4
i never said your way was the wrong way
I just tend to like seeing with my own eyes what the engine is doing, both to rule out my mistake and to make sure everything was assembled correctly, heh
------------------
Webmaster: www.IROC-Z.org
I just tend to like seeing with my own eyes what the engine is doing, both to rule out my mistake and to make sure everything was assembled correctly, heh
------------------
Webmaster: www.IROC-Z.org
#7
Supreme Member
Joined: Jul 1999
Posts: 18,457
Likes: 15
From: Loveland, OH, US
Car: 4
Engine: 6
Transmission: 5
I don't trust balancer marks. Balancers are bull droppings. The mark is only connected to the engine by a blob of spooge.
I use a dial indicator on the piston to find TDC. As previously stated, look for the #1 intake to close as the engine is rotated,; the next time the #1 piston reaches TDC, is the point you are looking for by whatever means.
------------------
"So many Mustangs, so little time..."
ICON Motorsports
I use a dial indicator on the piston to find TDC. As previously stated, look for the #1 intake to close as the engine is rotated,; the next time the #1 piston reaches TDC, is the point you are looking for by whatever means.
------------------
"So many Mustangs, so little time..."
ICON Motorsports
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#8
Supreme Member
Joined: Dec 1999
Posts: 1,237
Likes: 1
From: Reno, NV
Car: yep
Engine: uhuh
Transmission: sure does
<font face="Verdana, Arial" size="2">Originally posted by ColinOpseth:
i never said your way was the wrong way
I just tend to like seeing with my own eyes what the engine is doing, both to rule out my mistake and to make sure everything was assembled correctly, heh
</font>
i never said your way was the wrong way
I just tend to like seeing with my own eyes what the engine is doing, both to rule out my mistake and to make sure everything was assembled correctly, heh
</font>
I hear ya.. its like adjusting valves...everybody has their own way and their own spec...
Sorry, didn't mean to sound defensive
------------------
ASE Mechanic/Machinist/Smog Tech
1999 NBM Trans Am
1986 Chevy 3/4 ton pick up
1981 corvette
1995 Kawi ZX6R
and 2 POS commuters...
R.I.P. #3
"He can see air"
#9
Senior Member
Joined: Nov 2000
Posts: 762
Likes: 2
From: Riverside, CA
Car: 1987 Camaro IROC-Z
Engine: 305TPI
Transmission: 700R4
lol, s'ok hehe..
the best way (of course) to set TDC is with the timing chain cover off but once the engine is in the car you're at the mercy of the Camaro gods, lol
the best way (of course) to set TDC is with the timing chain cover off but once the engine is in the car you're at the mercy of the Camaro gods, lol
#12
Supreme Member
Joined: Dec 1999
Posts: 1,237
Likes: 1
From: Reno, NV
Car: yep
Engine: uhuh
Transmission: sure does
In that case...use the "finger in the hole" trick....hehehhh...I said hole..heheh.
------------------
ASE Mechanic/Machinist/Smog Tech
1999 NBM Trans Am
1986 Chevy 3/4 ton pick up
1981 corvette
1995 Kawi ZX6R
and 2 POS commuters...
R.I.P. #3
"He can see air"
------------------
ASE Mechanic/Machinist/Smog Tech
1999 NBM Trans Am
1986 Chevy 3/4 ton pick up
1981 corvette
1995 Kawi ZX6R
and 2 POS commuters...
R.I.P. #3
"He can see air"
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