The Once and Future 712...(or: Witches Hat Brew?)

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EvanH
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The Once and Future 712...(or: Witches Hat Brew?)

Post by EvanH » Sun Jun 28, 2009 8:41 pm

When I bought the 712, the only major problem I knew about was an exhaust leak. While changing out the header, I broke an exhaust stud, the most inaccesable one. Figures...

Then I realized the clutch was slipping, and the engine was drooling copious quantities of oil all over the driveway. Somewhere in there I realized the clutch was slipping, and found that the center tube was full of oil. All in all it added up to a major disassembly and restoration.

Here is the guts of the 712 on some pallets:

Image

Next I need to build a stand for the engine to give it a work-over. Hopefully that includes enough motivation for an EFI conversion:

Image

I expect to get a lot of use from my blasting booth:

Image

And my daughter has found an unexpected use for the 710 winch bumper:

Image

Meanwhile, the connection between the transfer case and the center tube burped out a pint or so of oil, making me think that I need to rework the transfer case as well as the transmission (wobbly input and output shafts) as well as the clutch.

Anyway, the transfer case witch's hat dumped quite a bit of oil when separated:

Image

Leaving quite a bit of oil in the central tube:

Image

Given that all I was expecting was broken 4x4 locker and an exhast leak, the 712 has been a hot bed of surprises!!!

-Evan

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ka
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Post by ka » Sun Jun 28, 2009 9:03 pm

wow... where did you get that thing? or... did you do all the damage?
1973 710m
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EvanH
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Post by EvanH » Sun Jun 28, 2009 9:26 pm

ka,

I bought it just before Christmas '08 from a seller in California. As is. All I have done with it is drive it home, realize it needed a lot of work, and take it apart.

As P.T. Barnum has been credited, "There's a Sucker Born Every Minute." I think I have earned enough points to be the sucker for my entire day of birth!!

-Evan

todds112
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Post by todds112 » Sun Jun 28, 2009 10:59 pm

Wow, I was just feeling a bit over-whelmed by my project. You just made me feel alot better! :shock:
1973 712M

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EvanH
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Post by EvanH » Sun Jun 28, 2009 11:12 pm

Wow, I was just feeling a bit over-whelmed by my project. You just made me feel alot better!
Todd,

Are you referring to the 712 or the daughter? The former is way more straight-forward than the latter.

-Evan

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Erik712m
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Post by Erik712m » Mon Jun 29, 2009 12:07 am

Evan, Is it so far just seals and gaskets or are you replacing parts?
Last edited by Erik712m on Mon Jun 29, 2009 12:25 am, edited 1 time in total.

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Jim LaGuardia
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Post by Jim LaGuardia » Mon Jun 29, 2009 12:25 am

I've seen much worse, that is normal to find. The oil actually leaks past the actuator sleeve and pin o rings in most cases. Replace the shaft bushing in the witches hat when you recondition the assembly.
Now is the time for a lightened drive shaft :wink:
Cheers, Jim LaGuardia
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Erik712m
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Post by Erik712m » Mon Jun 29, 2009 12:35 am

Jim LaGuardia wrote: Now is the time for a lightened drive shaft :wink:
Looks like someone all ready tried? IS that the correct way to lighten the shaft? Just take the torque tube out the end and not button it up.

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ExpeditionImports
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Post by ExpeditionImports » Mon Jun 29, 2009 7:23 am

No rocket science with lightening and balancing the drive shaft. (yes it appears from the picture this has been done.)

#1 - Remove the end caps.
#2 - Remove the inner shaft.
#3 - Tig the endcaps back onto the shaft.
#4 - Dynamically balance the assembly.

#1,2 a monkey can do. #3 - Requires some skills. #4 - Requires some fixtures including the end shafts, and the ability to put the unit on a balancing machine. (not the normal do it yourself fare.)

Well worth it when done.

Cheers,

Scott
Expedition Imports Corporation
Vallejo, California
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M Wehrman
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Post by M Wehrman » Mon Jun 29, 2009 3:44 pm

Better not take too long,some woodland critter is bound to move into your parts pile! :lol:
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EvanH
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Post by EvanH » Mon Jun 29, 2009 4:09 pm

M Wehrman wrote:Better not take too long,some woodland critter is bound to move into your parts pile! :lol:
You mean like one of those woodland nymphos...I mean, nymphs?

-Evan

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