Harmonic balancer mystery, I'm dazed. Which one do I need? - Team Camaro Tech
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post #1 of 6 (permalink) Old Nov 14th, 14, 07:48 PM Thread Starter
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guillaumeb
 
Join Date: Mar 2009
Location: quebec
Posts: 144
Harmonic balancer mystery, I'm dazed. Which one do I need?

Hello guys!

My 1968 camaro has a 327, converted into 350 using a 350 crankshaft.

Today, I read Lars' publication about finding the TDC and decided to check if my timing mark was good (if the outter ring had slipped from the inner ring). I discovered that my timing mark is about 10degrees off from the real TDC.

After removing the balancer, i realized that the timing mark SHOULD be in-line with the keyway. It is not.

I am confused and I can't find precise answers to my questions. I read that 1969 should have 10degrees off, and 1968 should be in-line. However, I can't find 1968 reproductions. Some sites (summit) lists 1969 unit for my 1968 but I think that this unit will come with the 10degrees off if I order.

I would like to know which balancer I need and where can I find?

thanks a lot guys!

g.b.
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post #2 of 6 (permalink) Old Nov 14th, 14, 09:05 PM
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alex
 
Join Date: Nov 2010
Location: boston ma.
Posts: 854
Re: Harmonic balancer mystery, I'm dazed. Which one do I need?

Yes you are right there are two balancer's pre 69 and post 69.Give Scoggins& Dicky Chevrolet in Lubbock Texas a call they will probably have one in stock. If you know someone that has the correct balancer you can fix yours to work with the proper mark Here's how. You will need 3 6in long 3/8ths fine thread bolts and then you have to thread them all the way down. Next you put one balancer ontop of the other and bolt the two together with the crank keyways inline. Next chuck them in a vise just to hold them . now you will see where the new line for the timing mark needs to go. Next mark it with a ruler then unbolt the two chuck in a vise and with a hacksaw slice in a new mark a little white paint and your all set. now you know which timing mark to use paint the old one orange. Alex
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post #3 of 6 (permalink) Old Nov 14th, 14, 09:26 PM Thread Starter
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guillaumeb
 
Join Date: Mar 2009
Location: quebec
Posts: 144
Re: Harmonic balancer mystery, I'm dazed. Which one do I need?

Thanks a lot! that clarifies that I have a post 69 balancer on a 68 crank, that explains why I had problems timing it.
I might try to ''modify'' my balancer to avoid buying a new one. Your trick seems pretty good and precise but I know nobody who has one.
However, I managed to get a pretty good mark while checking for tdc, i used a bolt in the number 1 sparkplug hole, turned the crank until the piston touches the bolt, marked the balancer. Turned the engine the reverse side until piston touches bolt and made a mark. TDC is right between those 2 marks.

I repeated this procedure with 3 different bolts lenghts and ended up with 3 pretty close TDC.

I then realized that my TDC was aligned with the keyway and also exactly 10degrees off, so , even if I do not have another balancer to make a mark using your method, I have a pretty close location where i could use a hacksaw to make a new mark. I may end up with a 1 degree difference (2 at worst) but that shouldn't make a huge difference in the end. I might fill the old mark with body filler and re-paint the balancer too.
I would have prefered to find a cheap one online but all the manufacturers offers balancers for 69 and after only.

Thanks a lot again for the clarifications!

g.b.
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post #4 of 6 (permalink) Old Nov 15th, 14, 01:17 AM
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paul
 
Join Date: Jul 2013
Location: england
Posts: 470
Re: Harmonic balancer mystery, I'm dazed. Which one do I need?

You could measure your balancer and then put this on it:

http://www.ebay.com/itm/MSD-8985-Tim...-/360968035297
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post #5 of 6 (permalink) Old Nov 15th, 14, 01:53 AM Thread Starter
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guillaumeb
 
Join Date: Mar 2009
Location: quebec
Posts: 144
Hey thanks for the reply. That would be the perfect solution but this restoration project is all about oem look! I will probably hack saw a new mark and fill the old one!

G. B.
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post #6 of 6 (permalink) Old Nov 15th, 14, 10:04 AM
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paul
 
Join Date: Jul 2013
Location: england
Posts: 470
Re: Harmonic balancer mystery, I'm dazed. Which one do I need?

Cool, that's fair enough. I used this solution a few times but you are right, its not much good for OEM !

Good luck with it.
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