Front Crank Seal behind the Harmonic Balancer
August 31st, 2017, 10:26 PM
#1
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Location: Oklahoma City, OK
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Front Crank Seal behind the Harmonic Balancer
Replacing the HB, and fixing a leak. Without the Kent-Moore BT-6405 seal installation tool, how do you know how far to install the seal? 
455, 1969 442.
As far as seals, I'm looking at National 472082. I have the 1050026 sealer, but what is the lubricant 1050169 that's called out in the 1969 repair manual?
455, 1969 442.
As far as seals, I'm looking at National 472082. I have the 1050026 sealer, but what is the lubricant 1050169 that's called out in the 1969 repair manual?
September 1st, 2017, 05:15 AM
#3
Old(s) Fart
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September 1st, 2017, 08:50 AM
#5
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Location: Oklahoma City, OK
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September 1st, 2017, 09:14 AM
#8
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I already have a date with the harmonic balancer and replacing the power steering system. Then I'll be crawling under the dash to straighten out 47 years of wiring no-no's from all the stereos and accessories that someone had wired in. Need new carpet, too. And those bumpers. Trumpets. Paint looks like it was put on with a broom. New new disc rotors/pads. Probably should flush the brake lines. Motor on the rear defroster sings a nice howl when it runs. Doors need re-aligned, then the front fenders/hood. Firewall grommets. For some reason, the car has a lean...not sure what that's about. Yeah, body off, soon enough!
March 13th, 2018, 05:44 PM
#11
Old(s) Fart
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The only question you need to ask yourself is, how confident are you in the condition of the timing chain and cam gear?
March 14th, 2018, 11:39 AM
#12
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Pretty confident. The engine has less than 1K miles on it. New H B installed when engine rebuilt. It has leaked since day one. BTW, how likely is it that the new H B's "shaft" diameter is not correct? What should it be?
March 14th, 2018, 06:04 PM
#15
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Location: St. Louis
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I bought an aftermarket HB for my last build that leaked. The builder measured the old HB and the new one was bigger by just enough to roll the seal and make it leak. He turned it down on a lathe and solved the leak. May not be your issue but easy enough to check. Good luck.
March 22nd, 2018, 12:08 PM
#20
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Location: St. Louis
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Measurements from my used balancer
March 22nd, 2018, 10:13 PM
#23
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Location: Northeast Connecticut
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The material of the seals today isn't as robust as the original seals. I have had more than my share of seal failures after purchasing present day seals. In the end, I sourced NOS seals, installed them, and no more problems. If you still have the original seal, compare it to the replacement and decide for yourself if it is comparable. Sometimes they are, but most of the times, they are not.
March 23rd, 2018, 04:20 AM
#24
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Mine did this from day one after rebuild in 2013 and the HB was aftermarket. First they tried putting a sleeve on but it still leaked. Took off sleeve, turned down HB shaft on lathe to match old one (except wear groove) and fixed the leak. They said if the shaft is too big the seal material rolls over enough to loose effectiveness. May be a good idea to change the seal again and check diameter as well.
March 24th, 2018, 09:44 PM
#27
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I already have a date with the harmonic balancer and replacing the power steering system. Then I'll be crawling under the dash to straighten out 47 years of wiring no-no's from all the stereos and accessories that someone had wired in. Need new carpet, too. And those bumpers. Trumpets. Paint looks like it was put on with a broom. New new disc rotors/pads. Probably should flush the brake lines. Motor on the rear defroster sings a nice howl when it runs. Doors need re-aligned, then the front fenders/hood. Firewall grommets. For some reason, the car has a lean...not sure what that's about. Yeah, body off, soon enough!
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