Page 1 TROUBLE SHOOTING AND E N H O T SI G S N I I M D S L I AN U B TR E R 4J T-8 By Robert Notman This book is dedicated to those unsung heroes of world war two—the mechanics and drivers. Without their dedication and duty to their machines the troops on the line would not have been the best equipped army in the field. Page 2 Published by Robert V. Notman Tallahassee, Florida USA Copyright © 2004 by Robert V. Notman ALL RIGHTS RESERVED First Edition No part of this book may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the copyright owner. Contact: [email protected] Printed in the United States of America. Other Copyright or Trademarks Notices: JeepTM is a trademark of DaimlerChrysler. The word jeep is a noun used to collectively describe those wartime vehicles built by American BantamTM, FordTM and of course, WillysOverlandTM. All trademarks and copyright marks belong to their respective owners, lack of trademark or copyright indicator is in no way meant to detract from their owners right of ownership or use. Manufacturers or vendors listed here do not indicate endorsement of any kind by those manufacturers or vendors. Pictures credited as noted. Disclaimers: Some of the information posted here was correct for the day but has since been replaced because of modern safety concerns. If you choose to use any of the information you do so at your own risk. Please try to use common sense and be careful! CAUTION: Working with machinery can be dangerous, please use common sense and use safe practices. Be sure to wear eye and ear protection. Use tools as they were designed to be used. Using screwdrivers can be hazardous. Page 3 TABLE OF CONTENTS INTRODUCTION 1 Noisy T-84J debunked? What parts do I need to purchase? How much time to repair and replace the transmission? 4 6 7 Which vendors should you buy your parts from? Shifting the transmission 1942 Ford GPW and 1941 Willys MB Transmission trouble and remedies Concerns and sage advice... New seal to stop lube pumping from the transfer case 9 10 11 12 14 16 Cluster shaft tool Transmission details Transmission variations -Pre-standardized BRC T-84 transmission 18 20 21 -Pre-standardized MA T-84 transmission -“Early” standardized WW2 jeep T-84J transmission -“Mid” standardized WW2 jeep T-84J transmission -“Late” standardized WW2 jeep T-84J transmission -The Weasel T-84 transmission What the heck is that thing for? Bearings Lube specifications Sore as a boil about oil U.S. and British lube equivalents Saving a worn case Parts diagram and list Your jeep jump outta gear? Sticking shift-lever on 1/4-tons 22 23 25 26 27 28 29 31 33 35 36 38 40 42 (Continued on next page) i Page 4 TABLE OF CONTENTS (CONTINUED) DISASSEMBLY 43 Before you begin… Remove gearshift housing Remove clutch release bearing Remove main drive gear bearing retainer Remove shifter fork guide rail Remove the low and reverse, and the second and high shifter forks Removing shifter shafts Remove counter shaft and idler shaft lock plate Remove counter shaft Main drive gear removal Remove mainshaft Remove idle reverse gear Cluster gear removal Disassemble countershaft gear Disassemble main drive gear Disassemble synchronizer Disassemble mainshaft 44 46 49 51 53 55 CLEANING Cleaning the parts… 57 59 60 61 62 64 65 66 67 70 71 73 74 77 INSPECTION AND REPAIR Transmission case assembly Shifter plate Main drive gear Mainshaft First and reverse gear Second gear Countershaft gear Idler gear Countershaft and idle gear shaft Synchronizer How to double clutch! Main drive gear bearing rollers Ball bearings Countershaft thrust washers First and reverse shifter fork Second and third shifter fork Shift lever 78 80 81 84 85 87 89 91 93 95 96 97 98 99 100 101 102 (Continued on next page) ii Page 5 TABLE OF CONTENTS (CONTINUED) ASSEMBLY 103 Install idle gear Install cluster gear Assemble mainshaft Install internal seal Install mainshaft assembly Assemble main drive gear Install main drive gear assembly Install countershaft Install lock plate Wire mainshaft and main drive gear Install first and reverse shifter fork Install second and third shifter fork Install guide rail Install shifter shaft plate and washer Install gearshift housing on case Install front bearing retainer Install cup, transmission second and third gear shifter shaft oil retainer Install gearshift lever Install interlock plunger Install clutch release bearing 104 105 108 112 113 117 119 120 122 123 125 128 131 132 133 134 138 FINAL THOUGHTS... INDEX 140 141 142 144 149 iii Page 75 use a block of wood, a vise and a hammer... ...to gently knock the bearing from the shaft. TROUBLE SHOOTING AND REBUILDING THE T-84J TRANSMISSION Page 69 Page 76 DISASSEMBLE SYNCHRONIZER Source: TM 9-1803B No. Synchros seem to be available in two versions...one’s that work and one’s that don’t! I have taken brand new synchros out of the box and couldn’t get the clutch hub to separate from the clutch sleeve. I would advise caution when purchasing a new synchro since some are not any good. Make sure the vendor has a good return policy. Two vendors that I have had success with transmission parts are Brent Mullin Jeep Parts and Richard Grace.. Willys Part No. Ford Part No. Name 1 637834 GPW-7107 Transmission Synchronizer Blocking Ring 2 637831 GPW-7109 Transmission Synchronizer Spring 3 637833 GPW-7106 Transmission Second and Direct Speed Clutch Sleeve 4 637835 GPW-7059 Transmission High and Intermediate Clutch Hub Snap Ring 5 637830 GPW-7105 Transmission High and Intermediate Clutch Hub Transmission Synchronizer Doesn’t mean that other deal6 637832 GPW-7116 Shifting Plate ers are just as good...it’s just that I have had nothing but success buying parts from these guys. Both it (except for the potential problems with vendors have always worked with me if I new ones already mentioned!) had a problem with a part. While the topic here is “dissemble synchronizer,” I don’t believe it is worth the trouble. Purchase a new synchro and be done with Page 70 Don’t reuse the existing synchro as worn blocking rings or other parts can lead to problems in shifting. TROUBLE SHOOTING AND REBUILDING THE T-84J TRANSMISSION Page 77 DISASSEMBLE MAINSHAFT Start by removing the snap ring. Of course, your ability to remove the ring depends on whether you have the “early” style spacer or the later spacer that has a recess for the snap ring. If you have a recessed snapring and spacer combination you are going to have to move the bearing. Simply put it loosely in a vise. Use your trusty 2x4 as a buffer and then hammer the “short” end of the mainshaft to move the bearing away from the spacer. Caution: Not pictured is the “oil baffle”, also called the “slinger”. Use care in moving the bearing with the method described above. If the slinger is in place with the recessed snap ring, then you can use a small section of pipe with a diameter just large enough to fit over the mainshaft AND spacer….then hammer as before. TROUBLE SHOOTING AND REBUILDING THE T-84J TRANSMISSION Page 71 Page 78 This is a spacer with the recess for the snapring. This could be in your transmission or you might have the spacer without. If you want to use the seal in the transmission, you will need to use this type spacer. Page 72 TROUBLE SHOOTING AND REBUILDING THE T-84J TRANSMISSION Page 79 G N I N A E L C CAUTION: Working with machinery can be dangerous, please use common sense and use safe practices. Be sure to wear eye and ear protection. Use tools as they were designed to be used. Using screwdrivers can be hazardous. TROUBLE SHOOTING AND REBUILDING THE T-84J TRANSMISSION Page 73 Page 80 CLEANING THE PARTS... I use commonly available brake cleaner. Simply spray it on and generally it quickly cleans the parts. Wash all parts thoroughly in dry-cleaning solvent until all trace of old lubricant has been removed. Oil the bearing surfaces immediately after cleaning to prevent corrosion of the highly polished surfaces. You should strive for a grease and oil free case so that you can get a good seal when you assemble the parts. Page 74 TROUBLE SHOOTING AND REBUILDING THE T-84J TRANSMISSION Page 81 As you clean each part, look it over for excessive wear, pitting or broken teeth. Cleaning the shafts of all residue will make the inspection phase so much easier. TROUBLE SHOOTING AND REBUILDING THE T-84J TRANSMISSION Page 75 Page 82 You are basically looking for the same things on each gear... ...and that would be wear, pitting, and missing teeth. The bushings should be looked over as well but we will look at all those issues more closely during inspection. Use a pan to collect the waste liquid left over from cleaning the transmission parts. Dispose of this chemical in accordance with your local laws. Page 76 TROUBLE SHOOTING AND REBUILDING THE T-84J TRANSMISSION Page 83 N O I T R I C A E P P S E N R I D N A CAUTION: Working with machinery can be dangerous, please use common sense and use safe practices. Be sure to wear eye and ear protection. Use tools as they were designed to be used. Using screwdrivers can be hazardous. TROUBLE SHOOTING AND REBUILDING THE T-84J TRANSMISSION Page 77 Page 84 TRANSMISSION CASE ASSEMBLY Inspect the case and gearshift housing for cracks or damage of any kind. Cracked or damaged units must be replaced. You will also want to check the case where the bearings insert to see if there is excessive wear. Check the Clutch release lever fulcrum for excessive wear. Take a new bearing, insert it into a clean case and see if you can get any side to side movement, if so your case will need to be replaced or requires some work not covered here. CLUTCH RELEASE LEVER FULCRUM Source: TM 9-1803B According to Jim Gilmore, a transmission case can be saved by having the case machined and a bushing made to fit the case and the bearing. That is beyond the scope of this project but should provide you with an idea of how you can save your valuable case. Page 78 TROUBLE SHOOTING AND REBUILDING THE T-84J TRANSMISSION Page 154 BIBLIOGRAPHY Power Transmission, Chapter XVIII, The Army Mechanic, Quartermaster Depot, Baltimore, MD 1938 The Jeep—It’s Development and Procurement Under The Quartermaster Corps, 1940-1942, Herbert R. Rifkind, Washington. D.C., 1943 The Military Jeep Model MB-GPW (revised edition), Lawrence Nabholtz. Linden, TX., 1999. TB 9-1859-8, Time Schedule Guide, 5 September 1952 (available as a reprint from Portrayal Press) Hopefully, with the advice from this book and your newly repaired T-84J, you won’t be needing a tow anytime soon….at least because of the transmission! Picture Source: Library of Congress. Army Motors, US Army, May, 1940—September, 1945 Book 120, Field Artillery Automotive Instruction, 1941 Edition TM 10-1103, Willys Model MA, 1941, reprinted by Post-Era Motor Books, Arcadia, CA 1971 TM 10-1186, Change 1, July 1, 1943 Master Parts List for Willys Trucks and Trailers Models MA and MB 1/4 Ton 4x4 Trucks and Model MB-T 1/4 Ton Trailer TM 10-1205, American Bantam Maintenance Manual Model BRC, 1941, reprinted by Post-Era Motor Books, Arcadia, CA 1971 Eng-Tips Forum, June 2003 TM 10-1348 Change 1, April 10, 1942 Parts List 1/4 Ton 4x4 Model GPW Contract Number 398-QM11424 Fundamentals of Mechanics, Morton C. Mott-Smith, Ph.D. and Marjorie Van De Water, The Infantry Journal, October, 1944 TM 10-1349 Maintenance Manual for Ford Truck 1/4Ton 4x4, Change 1, May 1, 1943. Lubrication, Army Motor Maintenance, Text No. 10, September, 30, 1940 TM 10-585 Automotive Power Transmission Units, April 10, 1941 Motor Vehicle Maintenance and Engineer Equipment, December, 1945 TM 9-1803B Power Train, Body, and Frame for 1/4Ton 4x4 Truck New Transmission Case for 1/4-Tons, Army Motors, December, 1944 TM 9-803 1/4-ton 4x4 Truck (Willys-Overland Model MB and Ford Model GPW), February, 1944 ORD 8 SNL G503, Truck, 1/4-Ton, 4x4, Command Reconnaissance (Ford, Model GPW; Willys, Model MB), Field and Depot Maintenance Allowances Transmissions, Chapter XX, The Army Motor Mechanic, Quartermaster Depot, Baltimore, MD 1936 ORD 9 SNL G-503, Ordnance Supply Catalog, 15 February, 1945 USMC Motor Vehicle Operators Course, Preventive Maintenance, Motor Transport School, Camp Lejeune, NC, 1943 Power Transmission Units, Preventive Maintenance Course for General and Field Officers, September 1, 1942 Page 148 TROUBLE SHOOTING AND REBUILDING THE T-84J TRANSMISSION Page 155 INDEX 1941 Willys MB: 11 1942 Ford GPW: 11 717th Airborne Ord. Co.: 15 90 weight: 31 A Allen socket type screws: 55 American Bantam Car Company: 21 Amsoil™: 31 Andreasson, John: 2 APO 928: 80 Army Motors: 16, 23, 32, 33, 35, 40, 42, 80 Assemble, main drive gear: 117 mainshaft 106 Assembly: 103 Atlanta, GA: 15 B Backlash: 86 Ball bearings: 98 Bantam: 20, 21 Barrow, Robert: 2, 27 Bayes, T/5 Robert E.: 18 BCA 1207SL: 29 BCA 6307S: 29 Bearing, gear retainer: 51 main drive gear: 29 mainshaft rear: 29 retainer, front, install: 134 Bearings: 29, 98 Before you begin...: 44 BesLube: 31 Book, purpose of: 1 Brass, Al: 2, 66 BRC T-84: 20, 21 Brent Mullins Jeep Parts: 9, 17, 70 Bristol wrench: 45, 55, 127 Bushing, counter shaft gear: 29 reverse idler: 29 C Capscrews: 47, 51, 137 Chicago Rawhide 17340: 17, 38, 112 Cleaning: 73 Cleaning the parts: 74 Cluster gear, install: 105 removal: 65 Cluster shaft tool: 18, 45 Clutch release bearing, install: 142 spring: 49 Clutching, double: 96 Concerns and sage Advice…: 14 Cork gasket: 51 seal: 135 Countershaft and idle gearshaft: 93 Countershaft, gear: 89 install: 120 thrust washers: 99 Cup, transmission second and third gear shifter shaft oil retainer: 38 install: 138 D Danner, Lt. Leroy M.: 15 Dear Ed.: 15, 80 Details, transmission: 20 Disassemble, counter shaft gear: 66 main drive gear: 67 mainshaft: 71 synchronizer: 70 Disassembly: 43 Discoloration: 94 Does oil pump from your transfer case into your transmission?: 16 Double clutching: 96 Dubois, Arend "Eagle": 2, 7, 23 E Eagle: 7, 23 “Early” standardized WW2 jeep T-84J: 23 Ebay: 9 Engine, starting: 10 Eng-Tips™ Forum: 31 Excessive noise: 13 TROUBLE SHOOTING AND REBUILDING THE T-84J TRANSMISSION F Final thoughts…: 144 First and reverse, gear: 85 shifter fork: 100 shifter fork, install: 125 Fitzgerald, Paul: 2, 28 Fitzpatrick, Ron: 2, 9, 18, 45, 55 FM-GPW-7059: 70 FM-GPW-7065: 14 FM-GPW-7080: 14 FM-GPW-7105: 70 FM-GPW-7106: 70 FM-GPW-7107: 70 FM-GPW-7109: 70 FM-GPW-7116: 70 FM-GPW-7208: 132 Ford jeeps refuse to get out of low gear; 14 Fork, first and reverse: 100 second and third: 101 Fourroux, Chris: 2, 24, 90, 100, 101 Front thrust washer: 99 G Gear bearing retainer: 51 Gearshift housing on case, install: 133 lever, install: 140 Gilmore, Jim: 2, 6, 28, 36, 78, 79 Gopan, Joel: 2, 9, 17, 28, 29, 38, 45, 48, 55, 67, 79, 112, 127, 132, 135, 140 GPW-61720: 14 Grace, Richard: 2, 5, 6, 9, 70, 122 Grammont, Steve: 2 Grease, leaks into bell housing: 13 pumps into transmission: 14 Guide, Time Schedule: 7 H Half-Mast, Sgt.: 14 Hard shifting transmission: 13 “heavy duty transmission”: 20, 21 How much time to repair and Page 149 Page 156 replace the transmission: 7 How to double clutch!: 96 HQ 3rd Bn. 126th Ord.: 15 I Idler, gear: 91 install: 104 Inspection and repair: 77 Install, cluster gear: 105 clutch release bearing: 142 countershaft: 120 cup, transmission second and third gear shifter shaft oil retainer: 138 first and reverse shifter fork: 125 front bearing retainer: 134 gearshift housing on case: 133 gearshift lever: 140 idle gear: 104 interlock plunger: 141 internal seal: 112 lock plate: 122 main drive gear assembly: 119 mainshaft assembly: 113 rail guide: 131 second and third shifter fork: 128 shifter shaft plate and washer: 132 Interlock, plunger: 40, 126, 141 install: 141 Internal seal, install 112 84J: 26 Lever, shift: 102 Lewis gear: 66 Lock plate, install: 122 Loss of lubricant: 13 Lt. Leroy M. Danner: 15 Lube equivalents, US and British: 35 Lube specifications: 31 Pre-standardized BRC T-84 transmission: 21 MA T-84 transmission: 22 Problems, transmission 12 Purpose of this book 2 M Rail guide, install 131 Ratio 20 Reamer 88 Rear, thrust washer: 99 washer: 99 Remove, clutch release bearing: 49 counter shaft: 60 counter shaft and idler gearshift housing: 46 idle reverse gear: 64 low and reverse, shifter fork: 55 main drive gear bearing retainer: 51 mainshaft: 62 shaft lock plate: 59 shifter fork guide rail: 53 second and high, shifter fork: 55 shifter shafts: 57 Re-peened rivets, transmission housing: 14 Retainer, gear bearing: 51 Reverse, shifting: 11 Roller bearings: 97 Rowland, Lamar and Jewel: 11, 145 Royall, T/4 Lucian W. Royall: 15 RTV: 17, 141 Main drive bearing: 29 gear: 81 Main drive gear assembly, install: 119 bearing rollers: 97 removal: 61 Mainshaft: 84 assembly, install: 113 rear bearing: 29 MB-164742: 14 McCluskey, Mac: 2, 18 Merriam-Webster Online: 31 “Mid” standardized WW2 jeep T84J: 25 Military Maintenance for MB/GPW jeeps 1941-45: 18 Model T-84J: 20 Monograde gear lube: 32 Motor Transport Officer: 15 Mullins, Brent: 9, 17, 70 Multi-grade gear lube: 32 MVPA rally: 11, 145 N Japan, US Army Log. Depot 23 Nabholtz, Lawrence: 23, 26 National 494122: 17, 112 NAVDOCKS TP-Tr-9: 7 New Seal to stop lube pumping from the transfer case: 16 News flash: 14 Noisy T-84J debunked: 4 K P Kish, Bill: 2, 99 Kosta, Sgt. Geza: 80 Packing string: 140 Parts diagram and list: 38 Permatex™: 133, 134, 141 Phillips, Thomas and Barbie: 2 Plate, "U" shaped: 12 Portrayal Press: 7 J L “Late” standardized WW2 jeep T- Page 150 R S S/Sgt M. W.: 14 Saving a worn case: 36 Scoring: 94 Scrambled jeep synchro-mesh: 41 Screw-Out™, Craftsmen: 55 Second and third shifter fork: 101 install: 128 Second gear 87 Serial No. 169756: 14 TROUBLE SHOOTING AND REBUILDING THE T-84J TRANSMISSION Page 157 Sgt. Half-Mast: 14 Shadetree mechanic: 2 Shift lever: 102 springs rust together: 41 Shift plate reinforcement 13, 80 Shifter plate: 80 trouble: 80 Shifter shaft plate and washer, install: 132 Shifting: hard: 13 lower speed in transmission: 10 reverse 11 transmission 10 Slinger, WO-A-410: 14, 17, 108, 109 Snake oil salesmen: 32 Sore as a boil about oil: 33 Spacer, recessed: 38 Specifications, lube: 31 Spence, Dennis: 7 Spring washer: 48 Starting the engine: 10 Starting vehicle: 10 Sticking shift-lever on 1/4-tons: 42 Stopping the vehicle: 11 string, packing: 140 Studebaker: 27 Studio: 2 Synchronizer: 62, 63, 70, 95, 115 T T/4 Lucian W. Royall: 15 T/5 Robert E. Bayes: 18 T/Sgt. F. W. D.: 14 TB 1803-1: 16 TB 9-1859-8: 7 TC 32: 33 The Jeep Complete: 44 The Military Jeep: 23 The Weasel T-84 transmission: 27 Time Schedule Guide: 7 TM 10-1349: 132 TM 21-305: 96 TM 9-803: 96 TO-19-1A-7: 7 Toledo, Oh: 14 Tool, assemble transmission: 18, 45 Tools, needed: 45 Trail ride: 11 Transmission, alined: 15 “C” shaped cutout worn: 79 case: 78 control housing assembly, defect: 15 details: 20 excessive noise: 13 function of: 2 grease leaks into bell housing: 13 hard shifting: 13 loss of lubricant: 13 new: 16 noise in low gear: 12 oil: 31 parts diagram and list: 38 problems: 12 saving a worn case: 36 scrambled jeep synchromesh: 41 shifter plate: 80 shifting: 10 shifting to lower speed: 10 slips out of gear: 12 slips out of high gear: 12 slips out of second: 12 spring washer: 48 sticking shift-lever on 1/4tons: 42 tools needed: 45 trouble and remedies: 12 variations: 21-27 what it does: 2 Trouble with shifter plates 80 W “U” shaped plate” 12, 49 “U” shaped washer: 48 US Army Log. Depot, Japan 23 USMC Preventive Maintenance Manual, 1943: 96 Warner: 20, 66 Washer, junk 99 rear 99 thrust, front: 99 thrust, rear: 99 wavy: 48, 132 Weasel T-84 transmission, the: 27 What parts do I need to buy?: 6 What the heck is that thing for?: 28 Which vendors should you buy your parts from?: 9 Why doesn't the lube in some of the 1/4-ton 4x4x go into the transmissions?: 14 Willys MA: 22 Wire mainshaft and main driver gear: 123 WO-635839: 132 WO-635844: 38 WO-635862: 140 WO-636885: 29 WO-637503: 38 WO-637830: 70 WO-637831: 70 WO-637832: 70 WO-637833: 70 WO-637834: 70 WO-637835: 70 WO-A-410: 14, 17 WO-A-738: 16, 38 WO-A-916: 14, 29 WO-A-1379: 140 WO-A-15427: 16, 17, 38, 112 WO-A-15428: 16, 17, 38, 112 www.ebay.com: 9, 45 www.G503.com: 1, 2, 18, 28, 66 www.jcwhitney.com: 45 www.military-media.com: 45 www.northerntool.com: 45 V Y Vehicle, Your jeep jump outta gear?: 40 U starting: 10 stopping 11 Viscosity, definition: 31 TROUBLE SHOOTING AND REBUILDING THE T-84J TRANSMISSION Page 151
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