You can either tap the hole with the proper helicoil tap and insert a
helicoil,or drill and
tap to 1/2" and use a larger (1/2") bolt. either method can be accomplished
without
removing the crank, if you are careful.
Tom Warner
58 short fleetside
Tom Burt wrote:
> I'm baaack. After a couple of months of torture at work, I've decide to
> haunt the oletruck pages again.
> Good to see the oletruck chat again.
>
> While off line, I tore the front off my 327 by removing the water pump
> (defective - squealed => leaked), replacing front main seal/timing cover,
> replaced steel freeze plugs with brass, and replaced outlet, hoses and
> fittings.
> Two questions:
>
> 1.) When removing the lower pulley, I noticed that the 7/16 bolt came out
> with galled threads (I had to sit down in amazement and shock over this
> one). The PO should definitely be shot! I also noticed that the water
> pump and crank pulleys were mismatched (different groove spacing). What
> was this guy thinking? How did I miss this during the sale? Jeeze!
>
> Pulling the harmonic balancer (H/B) worked fine with the proper tool.
> Thinking that I could somewhat correct this problem, I whipped open my
> rollaway drawer filled with assorted taps. The tap I had seemed too
> lightweight for a hardened crank (good only for aluminum) and I shuddered
> at the thought of breaking it off at this stage of the game. So, I
> refrained from the activity because I couldn't position myself to see the
> hole straight-on anyway.
> I lieu of tapping, I decided to clean up the bolt instead using a good die.
> The operation was successful, however; I still have reservations about the
> damaged crank threads and how to correct the problem.
> I replaced the H/B with gritted teeth because the tool to press it in was
> barely threaded into the crank, so needless to say, I was on pins and
> needles the whole time. Fortuneatly, the 7/16 bolt appears to be snugged
> down pretty tight.
>
> What I fear is that I have remove the main crank to rejuvenate the threads.
> Is there any alternative?
>
> 2.) While I was under the hood, I decided to pull/ flush the radiator and
> replace the thermostat. I drove it to work today and noticed the temp
> steady at about 190 deg.
>
> I am correct to assume that a 180 deg thermostat is sufficient to use on a
> 327 with no A/C?
>
> Tom B. '57 Stepside 3200
>
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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