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Author
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Topic: top dead center
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perk
Gearhead Posts: 338
From: Staley,nc
Registered: Sep 2000
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posted 03-14-2001 10:50 PM
   
Hey guys,just bought a tdc locatingsparkplug bolt.My ????,how do i adjust the bolt part so it is correct for setting TDC on a 351c??? Help........perk
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Moneymaker
Administrator Posts: 19686
From: Lyons, IL, USA
Registered: May 99
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posted 03-14-2001 11:23 PM
It has to hit the center of the piston or as close as you can come Perk.  ------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link
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SteveLaRiviere
Administrator Posts: 32961
From: Saco, Maine
Registered: May 99
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posted 03-15-2001 07:25 AM
My method is to install the tool, and slowly rotate the crank by hand until there is contact. Mark the balancer, then rotate the crank in the opposite direction until there is contact and mark the balancer. TDC is exactly between the two marks. ------------------
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L Disposable Commuter
"Live Right! Keep your driveway all Ford!"
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69maverick
Gearhead Posts: 890
From: Thomaston,CT.
Registered: Jan 2001
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posted 03-15-2001 08:37 AM
While we are on this subject,What do you guys think about the whistle type?
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SteveLaRiviere
Administrator Posts: 32961
From: Saco, Maine
Registered: May 99
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posted 03-15-2001 09:01 AM
Not needed. My thumb works fine for that!  ------------------
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L Disposable Commuter
"Live Right! Keep your driveway all Ford!"
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Moneymaker
Administrator Posts: 19686
From: Lyons, IL, USA
Registered: May 99
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posted 03-15-2001 11:06 AM
Whistle type???  You've got to be kidding me?  ------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link
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perk
Gearhead Posts: 338
From: Staley,nc
Registered: Sep 2000
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posted 03-15-2001 08:51 PM
Oh Alex,you know,whistle while you work. 
And thanks for the replys.perk
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kwazykat
Moderator Posts: 6317
From: ...a wonderful place to be.... orange county... NC!!!! M&M member #92 .... a blue-oval GRRL-deluxe.....
Registered: Jun 99
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posted 03-16-2001 08:43 AM
so... perk....are ya almost ready??!??!! ..TO GO RACING.... I MEAN!!!!! kk
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69maverick
Gearhead Posts: 890
From: Thomaston,CT.
Registered: Jan 2001
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posted 03-16-2001 09:20 AM
Alex: I can't find the book I seen it in,Maybe I miss read it but I think it said "use to locate TDC" It looked like a Comp.tester hose with a whistle on the end!
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SteveLaRiviere
Administrator Posts: 32961
From: Saco, Maine
Registered: May 99
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posted 03-16-2001 01:32 PM
I've seen them. It's a whistle you screw into the spark plug hole and it whistles on the compression stroke. But all you have to do is just loosen the spark plug and you'll hear the air escaping anyway. Or hold your thumb on the open spark plug hole and you'll hear and feel it. It doesn't find TDC by any accurate amount, it just tells you when the compression stroke is, then you sneak up on the TDC mark on the balancer. The best way to find TDC is with the head off, and with a dial indicator on a magnetic base and check the top of the piston. Then you check your balancer marks. {I've seen them up to 8 degrees off on Buicks} ------------------
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L Disposable Commuter
"Live Right! Keep your driveway all Ford!"
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Moneymaker
Administrator Posts: 19686
From: Lyons, IL, USA
Registered: May 99
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posted 03-16-2001 02:44 PM
I've seen them up to TEN degrees off on FoMoCo's! ------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link
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SteveLaRiviere
Administrator Posts: 32961
From: Saco, Maine
Registered: May 99
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posted 03-16-2001 05:03 PM
Really? The most I've seen on a FoMoCo was 3.Do you see alot off by that much? ------------------
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L Disposable Commuter
"Live Right! Keep your driveway all Ford!"
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perk
Gearhead Posts: 338
From: Staley,nc
Registered: Sep 2000
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posted 03-17-2001 12:14 AM
No Kat,I'm not.  I went today to get my heads and thet're not ready.They was supposed to have been ready last fri. and they were not.Said he would have them ready Mon. and they were not.Said they would be ready at 4pm today and they were still working on them.Tried to tell me 2 more hours(he was still doing the port work to match the intake gasket)and the vavle springs had not been installed. I go back at 10am Sat. Hopefully they will be ready,I MEAN,HE'S HAD THEM SINCE FEB. 1ST.I'm sorry,I needed to rant a little bit.
But,I thought for sure you ment "The Vapor Rub". :>)
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perk
Gearhead Posts: 338
From: Staley,nc
Registered: Sep 2000
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posted 03-25-2001 12:23 AM
Steve,Alex, How do I know if the locator is on the center or the edge of the piston ?
If I screw it in just enough to stop the piston,would that be enough or should I screw it in enough to stop the piston and then back off on the upstroke and screw it in a little more to try for the center.
once I find the correct position,then I'll make my marks for tdc.
Thanks, perk----- very
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Dave_C
Gearhead Posts: 737
From: Gadsden, Al
Registered: Aug 99
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posted 03-25-2001 09:31 AM
It doesn't matter where the stop contacts the piston as long as you don't move it when rotating the the engine.Screw the stop into # 1 cyl. Turn the engine slowly clockwise until the piston hits the stop. Write down what the pointer is pointing at. (Ex: may say 8 deg before TDC). Turn the engine the opposite (counter clockwise) direction 360 degrees until the piston hits the stop again. Again write down what the pointer is pointing at. TDC will be exactly halfway between the two points that you wrote down. It's easier to do with a degree wheel because a degree wheel is marked all the way around where the damper is not. Say the first mark is at 8 degrees before TDC. The second mark is at 6 degrees after (it will be after since you are approaching it from the opposite side). Add together 8+6 = 14 divide by 2 = 7. So 7 degrees from the first mark is true TDC. In this case 1 degree before is the true TDC. Later, David Cole
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perk
Gearhead Posts: 338
From: Staley,nc
Registered: Sep 2000
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posted 03-25-2001 06:39 PM
Thanks david .
perk
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