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Forums->Hot Heads Tech Talk->Harmonic balancer

Ccrussell
Harmonic balancer


Hello,
I have a 392 that has been in service for 8 or 9 years, but it has very low miles in that time. It is running the Hotheads 340 harmonic balancer. Car runs well.
Yesterday i got out the timing light to check things over and found that i cannot get the timing marks to line up anywhere close to what it should be.
If i turn the distributor to 8 to 10 degrees initial the car practically wont run.
Turning the distributor , setting by “ear” the car runs great.
What gives?
I am thinking of setting # 1 to tdc and installing a timing tape and starting fresh. Am i on track? This work?
Thanks
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on: Fri 20 of Sep, 2019 [00:25 UTC] reads: 983

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51coronet
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Re: Harmonic balancer
on: Sun 29 of Sep, 2019 [09:12 UTC] score: 0.00
I used Innovative Products of America 7886 10.5" Long Top Dead Center Indicator
and a dial indicator with magnetic base. Valve covers on just removed #1 sparkplug.
shine a flashlight inside to watch for the intake valve to close. then rotate clockwise from the front till the indicator stops moving.

https://www.amazon.com/gp/product/B000FMSU9Q/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

I have the fluidampr balancer on my 392 and the stock timing cover arrow points near the 270 mark. Fluidampr likely made these to point 0 at the 12oclock position. which you cant see hence the stock timing cover having the arrow on the passenger side at about 10 oclock.

If you use the method I did you can just look at the dial indicator to stop moving. No need to go in reverse because the balancer doesnt have the resolution a large degree wheel would in order to see a few degrees flat spot on the crank. I marked it with white out and ordered the timing tape for a 7.25 inch balancer. the 340 balancer may be different.

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hemistude
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Re: Harmonic balancer
on: Tue 24 of Sep, 2019 [14:59 UTC] score: 0.00
You're on the right track. I agree with Jack. Make a piston stop of some sort and find the true TDC. Carefully mark the balancer where it lines up with your pointer and then turn the crank so it is in a good position to access the new marking with a Dremel and a small cutoff wheel. You can easily grind a new, very accurate groove to permanently mark true TDC. And it will be 100% accurate -- something that can't be guaranteed by the HH damper and a 65 year old pointer combination.

You add up a timing tape to complete the job. If you have a degree-adjustable timing light you really don't even need the tape, but the 90 degree markings on a tape are really helpful when adjusting the valves. Whenever I put on a timing tape, I degrease the mounting surface with laquer thinner and scuff it up. I always glue it on with Permatex Weatherstrip adhesive (the yellow stuff). The adhesive on many timing tapes can't handle the heat cycling and they eventually fly off.

I took the cheap way out on my balancer. For the record, I have a 325 Dodge. I bought a stock 318 balancer from RockAuto. It didn't have the re-broached keyway to make it line up right on the early hemi, but with the re-marked TDC and a glued on tape, it's just as good and it saved me $100.

Good luck!

Dave

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DaveBlakeman
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Re: Harmonic balancer
on: Sat 21 of Sep, 2019 [17:31 UTC] score: 0.00
Find TDC then mark the balancer yourself. A degree wheel could help . McMaster -Carr can sell you a bolt for the degree wheel. TDC would be zero.

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Jack
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Re: Harmonic balancer
on: Fri 20 of Sep, 2019 [18:24 UTC] score: 0.00
Use a piston stop to determine true TDC and go from there.


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