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Author Topic: Which End?? 8v-71  (Read 5826 times)

Offline FolkBus

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Which End?? 8v-71
« on: August 23, 2013, 06:36:35 AM »
Hi all

I read many times on this board about which way a DD spins. Clock or counterclock.  Looking at the engine, from which end is this determined?  Pulley end or flywheel end?

Thanks

--Mike
Mike and Debbie McNeil  Ridgway - Montrose, CO
1949 Crown SuperCoach (Amazing Grace) Conversion 1972  Pancake 220 Cummins  Fuller 5 Speed

1967 MC-5A  (Serenity)  Conversion 1986  8v-71N   Allison MT-644

Offline Scott Crosby

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Re: Which End?? 8v-71
« Reply #1 on: August 23, 2013, 06:47:45 AM »
The rotation direction is what the transmission needs to accept - flywheel end
61 GM Fishbowl TDH 4516 102" 35'
1947 GM PD 3751
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Offline TomC

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Re: Which End?? 8v-71
« Reply #2 on: August 23, 2013, 07:42:52 AM »
Sorry Scott-the rotation is determined from the pulley side. Right hand rotation refers to which hand you had to use to crank start engines, originally. Hence a right hand engine uses your right hand to crank it (since most people are right handed) and spins clockwise when looking at the pulley end. Good Luck, TomC
Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.

Offline lostagain

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Re: Which End?? 8v-71
« Reply #3 on: August 23, 2013, 07:48:13 AM »
Refer to the first few pages of the DD service manual for your engine. It has a very clear description of how to look at the rotation.

JC
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Online luvrbus

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Re: Which End?? 8v-71
« Reply #4 on: August 23, 2013, 07:56:44 AM »
Rotation is from the rear of the engine not the front of the engine page 7 of of the DD bible, but I did like your theory TomC
« Last Edit: August 23, 2013, 08:02:43 AM by luvrbus »
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Offline bevans6

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Re: Which End?? 8v-71
« Reply #5 on: August 23, 2013, 08:30:47 AM »
I just call it normal and backwards, but I am a heathen...   ;D

Brian
1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
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Offline wg4t50

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Re: Which End?? 8v-71
« Reply #6 on: August 23, 2013, 09:04:16 AM »
The good part, you can make it go either direction you like.  Change gear position on flywheel end and convert the oil pump, bingo ;D
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Online luvrbus

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Re: Which End?? 8v-71
« Reply #7 on: August 23, 2013, 09:06:14 AM »
Not that easy Dave you change the cams also on a V engine and maybe the crank if it has a directional crank
« Last Edit: August 23, 2013, 09:10:50 AM by luvrbus »
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Offline wg4t50

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Re: Which End?? 8v-71
« Reply #8 on: August 23, 2013, 09:35:05 AM »
Yup, never did a V engine, but a few 53 & 71 inline babes.
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Offline Ed Hackenbruch

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Re: Which End?? 8v-71
« Reply #9 on: August 23, 2013, 10:10:12 AM »
 I am left handed and always used my left hand to crank up the engine that we had on a small jaw crusher in a quarry that i worked in a long time ago.......hated that thing in the winter time.
1968 MCI 5A with 8V71 and Allison MT644 transmission.  Western USA

Offline Chopper Scott

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Re: Which End?? 8v-71
« Reply #10 on: August 23, 2013, 10:36:10 AM »
Now I'm confused! LOL ;D
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Online luvrbus

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Re: Which End?? 8v-71
« Reply #11 on: August 23, 2013, 10:54:38 AM »
That makes 2 of us Scott the crank pulley will be the only thing turning different the cams turn the same direction right handed or left
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Offline eagle19952

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Re: Which End?? 8v-71
« Reply #12 on: August 23, 2013, 02:29:56 PM »
Can we see a video of the guy that can hand cranks a DD.... ;D
I will buy him a ham sandwich....a WHOLE ham... ;D
Donald PH
1978 Model 05 Eagle w/Torsilastic Suspension,8V71 N, DD, Allison on 24.5's 12kw Kubota.

Offline FolkBus

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Re: Which End?? 8v-71
« Reply #13 on: August 23, 2013, 03:33:29 PM »
For now I'll go with the flywheel end.  But I love all of the responses.

--Mike
Mike and Debbie McNeil  Ridgway - Montrose, CO
1949 Crown SuperCoach (Amazing Grace) Conversion 1972  Pancake 220 Cummins  Fuller 5 Speed

1967 MC-5A  (Serenity)  Conversion 1986  8v-71N   Allison MT-644

Offline Scott Crosby

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Re: Which End?? 8v-71
« Reply #14 on: August 24, 2013, 02:22:00 AM »
Don't go looking at the pulley on mine for the direction, because on my backwards engine there there is only one pulley and it's on the oposite side as the flywheel but it's not spinning the direction of the engine.  And I never paid attention to the radiator fan but I think it spins the wrong way too. Its not direct drive, though it's a fluid driven torque converter, but at first look it looks like gears from the crank would be turning it.  So back to my original post, it's what the transmission needs to accept, the direction the transmission input will turn. Which I suppose is still backwards if you're looking at a flywheel but you need to "be the transmission" while you at looking at it. I didn't know I needed to look at a book to determine if it turns a transmission left or right.  However my system only works when an engine is running and or turning over, because if I just saw an engine sitting on the ground, especially like a marine version that's not clearly a gm or mci, I wouldn't know unless it was running.  Or what if someone changed the direction of like a GM engine, easy to assume by looks or even if someone put the wrong starter on one, so it cranked the wrong way, so it might run horrible or not at all but it would be turning wrong.  So clearly I don't know the real way, but more oil leaks out on my left hand side, so it must be left hand rotation.
61 GM Fishbowl TDH 4516 102" 35'
1947 GM PD 3751
www.busgreasemonkey.com