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Wow - thanks to all of you for the feedback and input. Learned A LOT during this repair. Soon after my last post, I managed to find the TM (thanks to SS) and found the correct removal AND re-install procedure for the damper. Reading that along with seeing the condition of the key (and keyway)...

Below are some photos I took yesterday. QUESTION - while going through the TM's regarding removal and replacement of the damper and seal(s), it mentions TWO front seals - an 'inner' and 'outer' seal. When searching for front seals on line, I only find one - and none of the vendors mention that...

VERY interesting. So... If it's old / dry rotted or hardened, the vibration isn't absorbed which could cause the balancer itself to fail (crack)? Can the rubber be inspected?

GREAT Thanks!!

The first one was installed by a good friend (very knowledgeable regarding deuces - he has two). HOWEVER, while installing the first replacement, he tapped it with a hammer and broke the edge of the pulley. He replaced that one and installed it using a tool like a reverse puller. I don't know...

Ok- good questions and thoughts - I agree about the fact that two in four years would not seem to be from service. I only drive the truck in the summer months for shows, parades and events. I do drive it a lot, but not daily. I would say about 700 to 1000 miles a year (that would be high). I am...

Front seal on my 1971 M35A2 began leaking for the second time in 4 years. In both cases, we found the hub of the harmonic balancer cracked along the key way slot. This part of the hub rides inside the front seal. I'm trying to understand what conditions could lead to the this type of failure...