Bus Conversions dot Com Bulletin Board
November 26, 2014, 04:47:54 AM *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: If you had an Online Subscription: You will not incur forwarding fees when you are on the road.
   Home   Help Forum Rules Search Calendar Login Register BCM Home Page Contact BCM  
Pages: [1] 2  All   Go Down
  Print  
Author Topic: Which End?? 8v-71  (Read 1730 times)
FolkBus
It's a family thing
Jr. Member
**
Offline Offline

Posts: 57


1967 MC-5A - 1949 Crown Supercoach




Ignore
« 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
Full Member
***
Offline Offline

Posts: 136


WWW

Ignore
« 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
*****
Offline Offline

Posts: 6901





Ignore
« 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
Logged

Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
lostagain
Hero Member
*****
Offline Offline

Posts: 1593


MC5C




Ignore
« 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
Logged

JC
Invermere, BC
1977 MC5C, 6V92/HT740
luvrbus
Hero Member
*****
Offline Offline

Posts: 12916




Ignore
« 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 » Logged

Life is short drink the good wine first
bevans6
Hero Member
*****
Offline Offline

Posts: 4821


1980 MCI MC-5C




Ignore
« Reply #5 on: August 23, 2013, 08:30:47 AM »

I just call it normal and backwards, but I am a heathen...   Grin

Brian
Logged

1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
Spicer 8844 4 speed Zen meditation device
Vintage race cars -
1978 Lola T440 Formula Ford
1972 NTM MK-4 B/SR
wg4t50
Hero Member
*****
Online Online

Posts: 819





Ignore
« 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 Grin
Logged

MCI7 20+ Yrs
Foretravel w/ISM500
WG4T CW for over 50 wpm for ever.
Central Virginia
luvrbus
Hero Member
*****
Offline Offline

Posts: 12916




Ignore
« 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 » Logged

Life is short drink the good wine first
wg4t50
Hero Member
*****
Online Online

Posts: 819





Ignore
« 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 over 50 wpm for ever.
Central Virginia
Ed Hackenbruch
Hero Member
*****
Offline Offline

Posts: 2450




Ignore
« 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.
Logged

1968 MCI 5A with 8V71 and Allison MT644 transmission.  Western USA
Chopper Scott
Hero Member
*****
Offline Offline

Posts: 1301


MCI 7




Ignore
« Reply #10 on: August 23, 2013, 10:36:10 AM »

Now I'm confused! LOL Grin
Logged

Seven Heaven.... I pray a lot every time I head down the road!!
Bad decisions make good stories.
luvrbus
Hero Member
*****
Offline Offline

Posts: 12916




Ignore
« 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
*****
Offline Offline

Posts: 1326




Ignore
« Reply #12 on: August 23, 2013, 02:29:56 PM »

Can we see a video of the guy that can hand cranks a DD.... Grin
I will buy him a ham sandwich....a WHOLE ham... Grin
Logged

Donald PH
1978 Model 05 Eagle w/Torsilastic Suspension,8V71 NA, DDAllison on 24.5's 12kw Kubota.
Wants Paint Smiley
Previously owned by Wee Willie Ent.
FolkBus
It's a family thing
Jr. Member
**
Offline Offline

Posts: 57


1967 MC-5A - 1949 Crown Supercoach




Ignore
« 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
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
Full Member
***
Offline Offline

Posts: 136


WWW

Ignore
« 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
Pages: [1] 2  All   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines Valid XHTML 1.0! Valid CSS!