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RE: TR4 Dog Bolt Torque - & balance pieces

To: "'Randall'" <tr3driver@comcast.net>, "Triumphs List (E-mail)" <triumphs@autox.team.net>
Subject: RE: TR4 Dog Bolt Torque - & balance pieces
Date: Mon, 23 Aug 2004 14:25:22 -0700
On Sunday, August 22, 2004 10:51 PM, Randall [SMTP:tr3driver@comcast.net] 
wrote:
> > My TR4A developed a slight knock at low revs. On close inspection I
> > could see the harmonic balancer turning in an "elliptical" fashion. I
> > stopped the engine and grabbed  ahold of the fan, and it was loose!
> > So tomorrow I will pull the radiator (I have a 8 blade yellow fan)
> > and tighten it all down. When I looked through the manuals for torque
> > specs I couldn't find one.
> >
> > I'd imagine it'd be the same for all 4 cylinder TRactor engines. Any
> > insight?
>
> If the "harmonic balancer" aka pulley (TRactor motors use the fan for a
> harmonic dampener and don't need a balancer) was wobbling, then you are
> going to need to do more than just tighten bolts.  Chances are good that
> both the pulley hub and the crank nose are damaged.  The hub & Woodruff key
> can be replaced, but the crank is a bit harder to change.  Loctite makes a
> product for this purpose, called something like "circular parts mount" and
> capable of filling gaps of up to .010".
>
> Sorry I don't recall the torques offhand, but I think they're standard for
> the size bolts involved. (1/4" for the fan and something like 3/4" for the
> hub/extension to crank.)
>
> Randall
>
After pulling it all apart a couple of things presented themselves. The dog 
bolt was loose, and the woodruff key was markedly damaged. How the dog bolt got 
loose I haven't a clue, but I made sure that the locking ring was properly in 
place when I put the fan back on. NAPA auto parts had a new key for $.50.

I still don't know what the correct torque setting for the bolt is, but my 
guess is that it's on there at about 70-80 lbs now.

Another thing, I messed up and forgot to mark the way the balance pieces were 
when I took them off. Is there a way to know which way to reassemble them? 
Since I now have a plastic yellow fan are they still needed?

Thx, John

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