Tdc problema
Thread Starter
Drifting
Joined: Aug 2011
Posts: 1,861
Likes: 1
From: panama panama
Tdc problema
Hi iam in the midel of this job now .
I have numer 1 spark plug out trying top put the harmmonig balancer on tdc . But every time the mark isla close top the tdc the number 1 piston isla not at the top . I crank the car cumple of times top make the harmmonic mark go 360 But same every time the materia is close the piston is down
what iam doing wrong here please advice
I have numer 1 spark plug out trying top put the harmmonig balancer on tdc . But every time the mark isla close top the tdc the number 1 piston isla not at the top . I crank the car cumple of times top make the harmmonic mark go 360 But same every time the materia is close the piston is down
what iam doing wrong here please advice
Thread Starter
Drifting
Joined: Aug 2011
Posts: 1,861
Likes: 1
From: panama panama
Hi iam in the midel of this job now .
I have numer 1 spark plug out trying top put the harmmonig balancer on tdc . But every time the mark isla close top the tdc the number 1 piston isla not at the top . I crank the car cumple of times top make the harmmonic mark go 360 But same every time the materia is close the piston is down
what iam doing wrong here please advice
I have numer 1 spark plug out trying top put the harmmonig balancer on tdc . But every time the mark isla close top the tdc the number 1 piston isla not at the top . I crank the car cumple of times top make the harmmonic mark go 360 But same every time the materia is close the piston is down
what iam doing wrong here please advice
Sorry for the badajoz writting iam using my pone every hart top use
Team Owner
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From: Freedom is never more than one generation away from extinction.
St. Jude '03 thru '24
Are you installing the old harmonic dampener?
If so, the rubber may be deteriorated allowing the outer ring to loose it's zero.
Time to buy a new unit.
If so, the rubber may be deteriorated allowing the outer ring to loose it's zero.
Time to buy a new unit.
Melting Slicks
Joined: Feb 2011
Posts: 2,322
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From: Los Altos CA
Sounds like maybe the harmonic balancer mark is wrong. Focus on what is happening in cylinder 1. Get cylinder 1 to top dead center at the end of the compression stroke and check where the balancer and distributor are pointing.
using my pone every hart top use = using my phone very hard to use
took me a bit to translate that
using my pone every hart top use = using my phone very hard to use
took me a bit to translate that
Le Mans Master
Joined: Oct 2006
Posts: 6,842
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From: Palmdale CA
The harmonic balancer is not going to be "loose". It'll still be tight as hell, it'll just have shifted in one direction or another and give you a misleading indicator. We had to change ours in the 87' after I redid the top end.
Thread Starter
Drifting
Joined: Aug 2011
Posts: 1,861
Likes: 1
From: panama panama
Sounds like maybe the harmonic balancer mark is wrong. Focus on what is happening in cylinder 1. Get cylinder 1 to top dead center at the end of the compression stroke and check where the balancer and distributor are pointing.
using my pone every hart top use = using my phone very hard to use took me a bit to translate that
using my pone every hart top use = using my phone very hard to use
took me a bit to translate thatharmmonic balancer mark most be pointing some where under the car because i don see it
Thread Starter
Drifting
Joined: Aug 2011
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From: panama panama
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Melting Slicks
Joined: Feb 2011
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From: Los Altos CA
Thread Starter
Drifting
Joined: Aug 2011
Posts: 1,861
Likes: 1
From: panama panama
Melting Slicks
Joined: Feb 2011
Posts: 2,322
Likes: 6
From: Los Altos CA
The original mark has moved so you need to paint a new one. I haven't done this on a Vette but have on other cars...there should be some fixed indicator by the balancer mounted to the block. With number 1 cylinder at TDC, paint a white mark on the balancer at the indicator position. To check your timing you connect your timing light to the #1 spark plug wire and point it at the balancer. Every time #1 plug fires the light will strobe and you will see the painted mark. Setting the timing changes the relative position of the paint mark and reference indicator.
If your balancer is moving you probably need to replace it, but re-marking the old one should be good enough for now.
The good news is that, at TDC, the distributor is pointing to the right place. That's what you needed to learn from this experiment. Mark the balancer so you can check/set the timing, replace the plugs with the correct type & replace the plug wires if needed and hopefully you'll be able to get it started.
If your balancer is moving you probably need to replace it, but re-marking the old one should be good enough for now.
The good news is that, at TDC, the distributor is pointing to the right place. That's what you needed to learn from this experiment. Mark the balancer so you can check/set the timing, replace the plugs with the correct type & replace the plug wires if needed and hopefully you'll be able to get it started.
Le Mans Master
Joined: Oct 2006
Posts: 6,842
Likes: 285
From: Palmdale CA
Thread Starter
Drifting
Joined: Aug 2011
Posts: 1,861
Likes: 1
From: panama panama
The original mark has moved so you need to paint a new one. I haven't done this on a Vette but have on other cars...there should be some fixed indicator by the balancer mounted to the block. With number 1 cylinder at TDC, paint a white mark on the balancer at the indicator position. To check your timing you connect your timing light to the #1 spark plug wire and point it at the balancer. Every time #1 plug fires the light will strobe and you will see the painted mark. Setting the timing changes the relative position of the paint mark and reference indicator.
If your balancer is moving you probably need to replace it, but re-marking the old one should be good enough for now.
The good news is that, at TDC, the distributor is pointing to the right place. That's what you needed to learn from this experiment. Mark the balancer so you can check/set the timing, replace the plugs with the correct type & replace the plug wires if needed and hopefully you'll be able to get it started.
If your balancer is moving you probably need to replace it, but re-marking the old one should be good enough for now.
The good news is that, at TDC, the distributor is pointing to the right place. That's what you needed to learn from this experiment. Mark the balancer so you can check/set the timing, replace the plugs with the correct type & replace the plug wires if needed and hopefully you'll be able to get it started.
Melting Slicks
Joined: Feb 2011
Posts: 2,322
Likes: 6
From: Los Altos CA
Absotively, posilutely.
Though I doubt it would have run at all with it 180 degrees out.
Last edited by 3D87C4; Sep 29, 2011 at 02:04 PM. Reason: mis-spelled my intentional mis-spellings, d'oh!
Team Owner
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From: Hartford WI
Le Mans Master
Joined: Oct 2006
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From: Palmdale CA
Team Owner
Joined: Jul 2004
Posts: 28,432
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From: Hartford WI
You're right, but look where he's at: Panama, South America! There might be a Chevrolet dealer there (maybe, maybe not) and there might be a new balancer, but even here, a lot of the early C4 parts are quickly becoming NLA or "No Longer Available". Nothing a little appliance paint can't fix
Le Mans Master
Joined: Oct 2006
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From: Palmdale CA