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(Moderator:
Nick Badame Refrig/ACC
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Which End?? 8v-71
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Topic: Which End?? 8v-71 (Read 7385 times)
FolkBus
It's a family thing
Jr. Member
Posts: 89
1967 MC-5A - 1949 Crown Supercoach
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
Logged
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
Scott Crosby
Sr. Member
Posts: 308
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
Logged
61 GM Fishbowl TDH 4516 102" 35'
1947 GM PD 3751
www.busgreasemonkey.com
TomC
Hero Member
Posts: 9255
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
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Tom & Donna Christman. 1985 Kenworth 40ft Super C with garage. '77 AMGeneral 10240B; 8V-71TATAIC V730.
lostagain
Hero Member
Posts: 3031
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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JC
Blackie AB
1977 MC5C, 6V92/HT740 (sold)
2007 Country Coach Magna, Cummins ISX
luvrbus
Hero Member
Posts: 26068
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
Logged
Life is short drink the good wine first
bevans6
Hero Member
Posts: 6205
1980 MCI MC-5C
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...
Brian
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1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
Allison MT-647
Tatamagouche, Nova Scotia
wg4t50
Hero Member
Posts: 913
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
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MCI7 20+ Yrs
Foretravel w/ISM500
WG4T CW for ever.
Central Virginia
luvrbus
Hero Member
Posts: 26068
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
Logged
Life is short drink the good wine first
wg4t50
Hero Member
Posts: 913
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.
Logged
MCI7 20+ Yrs
Foretravel w/ISM500
WG4T CW for ever.
Central Virginia
Ed Hackenbruch
Hero Member
Posts: 2984
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.
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Used to own a 1968 MCI 5A and a 1977 5C.
Chopper Scott
Hero Member
Posts: 1303
MCI 7
Re: Which End?? 8v-71
«
Reply #10 on:
August 23, 2013, 10:36:10 AM »
Now I'm confused! LOL
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Seven Heaven.... I pray a lot every time I head down the road!!
Bad decisions make good stories.
luvrbus
Hero Member
Posts: 26068
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
Logged
Life is short drink the good wine first
eagle19952
Hero Member
Posts: 4039
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....
I will buy him a ham sandwich....a WHOLE ham...
Logged
Donald PH
1978 Model 05 Eagle w/Torsilastic Suspension,8V71 N, DD, Allison on 24.5's 12kw Kubota.
FolkBus
It's a family thing
Jr. Member
Posts: 89
1967 MC-5A - 1949 Crown Supercoach
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
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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
Scott Crosby
Sr. Member
Posts: 308
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.
Logged
61 GM Fishbowl TDH 4516 102" 35'
1947 GM PD 3751
www.busgreasemonkey.com
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Which End?? 8v-71
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