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Author Topic: How do you remove a HT745CR from an 8V71?  (Read 5553 times)
NewbeeMC9
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1981 MC9 8V71, HT 740




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« Reply #30 on: July 14, 2010, 02:40:38 PM »


I am thinking a nice 32oz Ball Peen Hammer and some Liquid Nitrogen might make some well placed holes in cast Iron. Wink
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Chopper Scott
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« Reply #31 on: July 14, 2010, 04:53:26 PM »

Actually a plasma cutter works well on cast. A torch does not, in fact not at all. Just beware that the plasma cutter will also cut things deeper than the part you want cut!
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kyle4501
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« Reply #32 on: July 14, 2010, 07:12:55 PM »

I ain't got neither, but I do got a hole saw & a right angle hole hawg drill.  Grin

Found a manual today on the allison site that explains the proceedure for installing/ removing this transmission.  Grin

Yes, the crankshaft has to rotate relative to the bellhousing.  Shocked
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« Reply #33 on: July 14, 2010, 09:47:19 PM »

Quote from: kyle4501
I ain't got neither, but I do got a hole saw & a right angle hole hawg drill.  Grin

Found a manual today on the allison site that explains the proceedure for installing/ removing this transmission.  Grin

Yes, the crankshaft has to rotate relative to the bellhousing. Shocked


That will have 2b 1 Bad... hole saw!

Duh! (big red truck! Wink)
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Busted Knuckle aka Bryce Gaston
KY Lakeside Travel's Busted Knuckle Garage
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kyle4501
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« Reply #34 on: July 15, 2010, 05:29:18 AM »

That will have 2b 1 Bad... hole saw!

Duh! (big red truck! Wink)


BK, Might this explain your high maintenance costs? ? ?

 Grin   Roll Eyes   Huh   Shocked   Grin
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kyle4501
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« Reply #35 on: July 17, 2010, 04:51:55 PM »

Success!
A friend came over this afternoon to help. ( He remembers working on the Scenicruisers when they still had the twin 4-71s in em! )

When we took the the heads off, we found the problem - RUST & lots of it! We were able to use a prybar against the ring gear to turn the crank - It pushed out 3 liners as the pistons rose in those cylinders. We soon learned if the piston pushed up a liner, we'd need to drive the liner back down if we didn't want the motor stuck again. We used a block of wood & a bfh to drive the liner back down & then continued to rotate the crank as needed to access the flex plate to torque converter bolts. Since the bellhousing adapter was already broken, I enlarged the hole to enable a few clicks of ratchet indexing. Amazing how easy it was to break the cast iron after a little bit of prep work with a cut off wheel.  Grin

The bolts all seemed to be properly torqued & as far as the transmission was concerned, they all came out very easily - no rust or corrosion - YEA!  Cool Grin

That transmission is HEAVY! I'm glad I made a gantry crane, sure came in handy today!
BTW, the heads aren't that heave when a chain hoist is used.  Grin


Now to find the 8V92 to go in front of it & to clean & prepare the cradle for installation in the lucky bus. Cool
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luvrbus
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« Reply #36 on: July 17, 2010, 05:13:52 PM »

Head west young man I have a rebuild able complete 8v92 yours free I need it gone you will need the center for the flex plate not the complete plate the one off the 71 won't work cost about 2 grand in parts for the rebuild comes with 2 different bell housings your choice.

good luck
« Last Edit: July 17, 2010, 05:15:45 PM by luvrbus » Logged

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kyle4501
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« Reply #37 on: July 17, 2010, 05:52:16 PM »

That's a generous offer.  Grin

Can you PM me the address so I can look into the logistics.

Thanks!
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jackhartjr
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« Reply #38 on: July 17, 2010, 07:14:46 PM »

I see a road trip in our future Kyle!
Wonder if they can load me back from AZ with something not sealed? Grin
Jack
Clifford, how hard/easy to put it on a trailer?  (Truck trailer.)
I would guess the motor to weigh about 3,000 lbs?Huh?
Jack
PS...where are you located Clifford?

jackhartjr@aol.com
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Jack Hart, CDS
1956 GMC PD-4501 #945 (The Mighty SCENICRUISER!)
8V71 Detroit
4 speed Spicer Trannsmission
Hickory, NC, (Where a call to God is a local call!)
luvrbus
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« Reply #39 on: July 17, 2010, 07:48:56 PM »

Guys I am off I 40 at Needles Ca 5 miles north on Az 95 towards Bullhead  between mile marker 229 and 230  not a good place for summer time travel 120* here today 



good luck
« Last Edit: July 17, 2010, 07:51:33 PM by luvrbus » Logged

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jackhartjr
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« Reply #40 on: July 17, 2010, 07:51:40 PM »

Hi Clifford, can we get it on the rear of a trailer?
Thanks
Jack
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Jack Hart, CDS
1956 GMC PD-4501 #945 (The Mighty SCENICRUISER!)
8V71 Detroit
4 speed Spicer Trannsmission
Hickory, NC, (Where a call to God is a local call!)
luvrbus
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« Reply #41 on: July 17, 2010, 07:53:26 PM »

Sure can Jack
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kyle4501
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« Reply #42 on: July 17, 2010, 08:13:09 PM »

I've driven further for parts before, but not much.  Grin

Jack, call me Sunday afternoon when convenient.

Clifford, how soon does it need to be gone.

Wish I had more vacation, I'd like to take some time to do this trip right.  Cool
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« Reply #43 on: July 17, 2010, 08:21:13 PM »

Kyle I would like for all 4 engine to be gone before the 1st of the year 2 8v92, 1 6v92 and 1 8v71 we will be gone till the middle of Sept to hell with this heat.If you could take 3 days here I would help you build it the heads have been reworked the guy tried to rebuild it his self and drove the wrist pin seals in with a socket and hammer and never did a vacuum test on the seals and they don't last long when you do it that way


good luck
« Last Edit: July 17, 2010, 08:31:03 PM by luvrbus » Logged

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Eagle Andy
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« Reply #44 on: July 17, 2010, 08:30:23 PM »

Hey Clifford , It's nice up here in Montana and if you go to Idaho come by the house in mies city and I'll buy you and Sonja dinner and put u up  Grin
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1968 Model 05 Eagle # 7481 Miles City MT
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