Timing problem

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Nov 17, 2012 | 03:14 PM

#21

77C34SPD

Racer

Joined: Jun 2009

Posts: 393

Likes: 3

Replace it if its spun, I would not even attempt to start the engine again untill its been replaced.

Nov 17, 2012 | 03:21 PM

#22

larrywalk

Melting Slicks

Joined: Oct 2002

Posts: 2,314

Likes: 111

From: St Louis MO

Quote:

Originally Posted by FatCat

Hey guys! Here is the issue... I adjusted my timing according to the Lars timing docs and was having a detination problem. I emailed Lars and he told me to do a TDC test and here is the results. What do I do from here? It would apper that the balancer has slipped.

Any suggestions or input is greatly appreciated.

You're off by 10 degrees, but was it correct before, meaning that it moved?... Another possibility is that it's a pre-69 balancer (harmonic damper) which had the TDC groove aligned with the crank's keyway. Later dampers had the inertia ring 10 degrees counter-clockwise from the keyway.

Here's an easy check: If the TDC mark aligns with one of the three bolts holding on the crank pulley (which also aligns with the keyway), AND if the inertial ring shows no wobble, you may simply have the wrong damper. If you are confident that there has been no slippage, mark a new TDC line on the damper and re-time.

Nov 17, 2012 | 03:26 PM

#23

scottyp99

Le Mans Master

Joined: Mar 2008

Posts: 5,948

Likes: 72

From: Oxford MA-----You just lost the game!!!!

http://www.summitracing.com/parts/rn...model/corvette

You'll need a puller:

http://www.summitracing.com/parts/wmr-w151p/overview/

Keep the shiny side up!

Scott

Nov 17, 2012 | 03:41 PM

#24

68thumper

Instructor

Joined: May 2011

Posts: 191

Likes: 1

From: Orange Ca

Quote:

Originally Posted by FatCat

Here is how I arrived at it.... I am working alone for the most part. I hook a compression test guage up to #1 and hand cranked until the needle moved up. I then put a long piece of wire in the plug hole and hand cranked until I had the piston at it's highest point, moving back and forth to verify.

I'm not disagreeing with the opinions given here but be aware that there is a dwell at TDC where the piston does not move but the crankshaft can still rotate a few degrees. To make sure you are at TDC use a piston stop. Forget the cheap ones you get from Jegs or Summit. Take a used spark plug and remove the porcelain center and electrode then screw a long 3/8" by 6 inches or so bolt in it. I ground the end down so it would not nick the top of the piston and I put a lock nut on it so i get the same result all the time. Turn the engine "by hand" clockwise till the piston hits the stop...mark the balancer then rotate the engine counterclockwise till it hits the piston...mark the balancer...TDC is in the middle of the two marks....

Nov 17, 2012 | 05:23 PM

#25

PeteZO6

Drifting

Joined: Apr 2007

Posts: 1,970

Likes: 45

From: Cameron Park CA

Quote:

Originally Posted by scottyp99

http://www.summitracing.com/parts/rn...model/corvette

You'll need a puller:

http://www.summitracing.com/parts/wmr-w151p/overview/

Keep the shiny side up!

Scott

But you will also need an installation tool. DO NOT use a hammer on the harmonic balancer, or use the retaining bolt to pull it on. You can strip the bolt hole in the nose of the crank.

http://www.summitracing.com/parts/pro-66515/overview/

Take Lars' advise, replace it before it caused more $$damage$$.

Good luck,
Pete

Nov 17, 2012 | 05:53 PM

#26

gcusmano74

Drifting

Joined: Mar 2011

Posts: 1,886

Likes: 9

Quote:

Originally Posted by 68thumper

What he said.

Nov 17, 2012 | 05:58 PM

#27

scottyp99

Le Mans Master

Joined: Mar 2008

Posts: 5,948

Likes: 72

From: Oxford MA-----You just lost the game!!!!

Quote:

Originally Posted by PeteZO6

Oh, yeah, excellent point. If you think it's OK to hammer the dampener on, just imagine what you are doing to the thrust bearing!

Keep the shiny side up!

Scott

Nov 17, 2012 | 09:41 PM

#28

FatCat

Thread Starter

Drifting

Joined: Aug 2012

Posts: 1,650

Likes: 2

From: Tulsa Oklahoma

Ithink winter is here and time to just pull the engine and get dirty!!! I guess I need to look for threads that can lead me in the removal process now!!! I have never taken on anything like this

Wish me luck!

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Nov 17, 2012 | 10:39 PM

#29

scottyp99

Le Mans Master

Joined: Mar 2008

Posts: 5,948

Likes: 72

From: Oxford MA-----You just lost the game!!!!

Don't worry, Stephanie will show you what to do.........

http://www.youtube.com/watch?v=QORm5fnCvYA

Keep the shiny side up!

Scott

Nov 17, 2012 | 11:03 PM

#30

FatCat

Thread Starter

Drifting

Joined: Aug 2012

Posts: 1,650

Likes: 2

From: Tulsa Oklahoma

Quote:

Originally Posted by scottyp99

Don't worry, Stephanie will show you what to do.........

http://www.youtube.com/watch?v=QORm5fnCvYA

Keep the shiny side up!

Scott

Haha! Yes she will! I am going to go ahead and start pulling the whole engine for the winter! You got any guidance on where to start, what needs to be disconnected, what not to do ect?

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