A dwell meter is used to check the dwell angle on vehicles with a points-type ignition. Dwell angle is the length of time (measured by the degree of rotation of the distributor cam) the contact points open on a points-type ignition system. Points-type ignition systems were commonly used on vehicles manufactured before the mid-1970s. The dwell angle must be periodically checked on these vehicles to ensure proper operation of the ignition system. In addition, the dwell angle on these vehicles must be checked before setting the ignition timing.
Connecting the Tach Dwell Meter
Step 1
Run the engine long enough to bring it up to normal operating temperature and then shut it off.
Step 2
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Connect the positive lead on the tach dwell meter to the positive terminal on the ignition coil.
Step 3
Connect the negative lead on the tach dwell meter to the negative terminal on the ignition coil.
Open the small metal cover on the side of the distributor cap and insert an Allen wrench into the screw behind the cover.
Checking the Dwell Angle
Mac Tools Em110 Manual
Step 1
Step 2
Take the reading on the tach dwell meter and compare it with the figure on the engine tune-up decal in the engine bay or in the vehicle's service manual.
Step 3
Turn the Allen wrench slowly to adjust the dwell angle to the correct setting.
Step 4
Step 5
![User User](https://mans.io/images/1073736/1165591.jpg)
Remove the Allen wrench from the distributor. Make sure the small metal cover on the side of the distributor is closed.
Remove the electrical leads from the ignition coil.
Tip
- Make sure the electrical leads for the tach dwell meter do not interfere with any of the moving parts on the engine such as the engine fan. Also make sure the electrical leads do not contact any part on the engine that develops excessive heat, such as the exhaust manifolds. Some distributor caps do not have a window to insert an Allen wrench to adjust the dwell angle. If yours does not, you will have to stop the engine, remove the distributor cap and incrementally adjust the dwell angle.
Warning
- While working on a running engine, keep your hands away from moving parts on the engine, such as the accessory drive belts or any part of the engine that becomes excessively hot.
- Chilton GM Nova/Chevy II 1962-1979 Repair Manual; The Nichols Chilton Editors; 1997
- Haynes Chevrolet Camaro 1970 thru 1981 Automotive Repair Manual; Scott Mauck and John H. Haynes; 1983
- Haynes Ford Full-Size Vans 1969 thru 1991 Repair Manual; Curt Choate and John H. Haynes; 1992
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EST. EST 1938 CATALOGSUPPLEMENT Inside you will find the new products not listed in your MacTools - 70 Catalog. You will receive a Catalog Supplement once a month This Catalog Supplement will contain new items added to the MacTools product offering. File each page according to the page number at the bottom of each sheet in the appropriate section of your loose leaf MacTools - 70 Catalog. 1-800-MAC-TOOLS • 1-800-MAC-FAX5 Prices shown are current at time of printing and are subject to change without notice.
- Page 2 and 3: INDEX Part Number Page# 71410 634 0
- Page 4 and 5: INDEX STY66120 485 STY66122 485 SVI
- Page 6 and 7: 17 TOOL BOXES MB1357 MACSIMIZER 7-D
- Page 8 and 9: 45 TOOL BOXES MB1300UC-GRD Stainles
- Page 10 and 11: 45 TOOL BOXES MB1305UC-ENC MACSIMIZ
- Page 12 and 13: 47 MB323UC UTILITY CART LID ��
- Page 14 and 15: 47 TOOL BOXES SHOP EQUIPMENT MB403U
- Page 16 and 17: 47 ���������� S
- Page 18 and 19: 54 DRIVE TOOLS SMXTUL3P T-HANDLE SP
- Page 20 and 21: �� ���������
- Page 22 and 23: 60 DRIVE TOOLS ������
- Page 24 and 25: 63 DRIVE TOOLS M14SL 1/4” DRIVE L
- Page 26 and 27: 69 DRIVE TOOLS 1/4” SHOP EQUIPMEN
- Page 28 and 29: �� ���������
- Page 30 and 31: 78 ����������
- Page 32 and 33: �� �������� �
- Page 34 and 35: 86 DRIVE TOOLS ������
- Page 36 and 37: 91 HAND TOOLS SXU7SBR 7-PC. 3/8”
- Page 38 and 39: 105 DRIVE TOOLS SHOP EQUIPMENT VR12
- Page 40 and 41: 111 ����������
- Page 42 and 43: 127 SHOP ACCESSORIES SVUPDG66BR 6-P
- Page 44 and 45: 131 DRIVE TOOLS W10EKLQ 10 Q 1” 1
- Page 46 and 47: 136 DRIVE TOOLS SXMTSH8B 8-PC. 8 PC
- Page 48 and 49: 140 DRIVE TOOLS SXMAH7PT 7-PC. METR
- Page 50 and 51: ��� ��������
- Page 52 and 53: 173 WRENCHES SHOP EQUIPMENT SHKML9P
- Page 54 and 55: 175 WRENCHES SHKPH92 9-PC. 2” SAE
- Page 56 and 57: 179 WRENCHES SHOP EQUIPMENT TWXF100
- Page 58 and 59: 181 WRENCHES TWX250 3/8” 50-250 I
- Page 60 and 61: 182 WRENCHES NEW MAC TOOLS ANGLE TO
- Page 62 and 63: 187 HAND TOOLS SHOP EQUIPMENT �
- Page 64 and 65: 191 HAND TOOLS SHOP EQUIPMENT 192.1
- Page 66 and 67: 193 HAND TOOLS SHOP EQUIPMENT 185.2
- Page 68 and 69: 195 HAND TOOLS SHOP EQUIPMENT P5INS
- Page 70 and 71: 200 HAND TOOLS SHOP EQUIPMENT PK2Q
- Page 72 and 73: 202 HAND TOOLS SHOP EQUIPMENT TCT80
- Page 74 and 75: 216 HAND TOOLS SHOP EQUIPMENT SDRBI
- Page 76 and 77: 220 HAND TOOLS PBD10S 10-PC. BIT SE
- Page 78 and 79: 221 HAND TOOLS SHOP EQUIPMENT SPMR3
- Page 80 and 81: 229 HAND TOOLS SHOP EQUIPMENT MTL46
- Page 82 and 83: 229 HAND TOOLS UK536M MINI UTILITY
- Page 84 and 85: 234 HAND TOOLS SHOP EQUIPMENT XTIME
- Page 86 and 87: 235 HAND TOOLS ARMY8C US ARMY BRAND
- Page 88 and 89: 236 HAND TOOLS MTL300 MAC TOOLS KNI
- Page 90 and 91: 238 HAND TOOLS SHOP EQUIPMENT HS30R
- Page 92 and 93: 239 HAND TOOLS SHOP EQUIPMENT PCHG1
- Page 94 and 95: ��� HAND TOOLS SHOP EQUIPMENT
- Page 96 and 97: ��� HAND TOOLS SHOP EQUIPMENT
- Page 98 and 99: 247 HAND TOOLS SHOP SUPPORT SH3AV 3
- Page 100 and 101: 252 HAND TOOLS 1/4” SHOP EQUIPMEN
- Page 102 and 103: 257 HAND TOOLS SXT9LR 9-PC. 3/8”
- Page 104 and 105: ��� ��������
- Page 106 and 107: 273 ����������
- Page 108 and 109: 276 POWER TOOLS AW1000 1” SQUARE
- Page 110 and 111: 278 POWER TOOLS SHOP EQUIPMENT AR14
- Page 112 and 113: 284 POWER TOOLS 6429DS 29-PC. Advan
- Page 114 and 115: 307 POWER TOOLS AH5512 1/2” AIR H
- Page 116 and 117: 319 POWER TOOLS HFZ3850YW2 3/8” X
- Page 118 and 119: 320 ����������
- Page 120 and 121: 328 DIAGNOSTICS & TESTING ET5010TPR
- Page 122 and 123: 328 DIAGNOSTICS & TESTING SHOP EQUI
- Page 124 and 125: 332 SHOP ACCESSORIES ET3828WK-NB MA
- Page 126 and 127: 344 DIAGNOSTICS & TESTING ET3010AC2
- Page 128 and 129: 344 DIAGNOsTICs & TEsTING ET3011AC
- Page 130 and 131: ��� DIAGNOSTICS & TESTING SHO
- Page 132 and 133: 347 DIAGNOSTICS & TESTING ETX431MST
- Page 134 and 135: 347 DIGNOSTICS & TESTING ET3022 CAR
- Page 136 and 137: 347 DIAGNOSTICS & TESTING ���
- Page 138 and 139: 347 DIAGNOSTICS & TESTING ET97 �
- Page 140 and 141: ��� DIAGNOSTICS & TESTING �
- Page 142 and 143: 352 DIAGNOSTICS & TESTING ET3834 TI
- Page 144 and 145: ��� DIAGNOSTICS & TESTING SHO
- Page 146 and 147: 357 DIAGNOSTICS & TESTING SHOP EQUI
- Page 148 and 149: 361 DIAGNOSTICS SHOP EQUIPMENT & TE
- Page 150 and 151: ��� DIAGNOSTICS & TESTING �
- Page 152 and 153: 367 DIAGNOSTICS & TESTING SHOP EQUI
- Page 154 and 155: ��� DIAGNOSTICS & TESTING ET8
- Page 156 and 157: 369 SHOP ACCESSORIES ET8088 PULSAR
- Page 158 and 159: 369 HAND tOOLS Et7900M7RM SMARt-MUt
- Page 160 and 161: 372 DIAGNOSTICS & TESTING ���
- Page 162 and 163: 373 DIAGNOSTICS & TESTING VS36 VIDE
- Page 164 and 165: ��� ��������
- Page 166 and 167: 376 DIAGNOSTICS & TESTING SHOP EQUI
- Page 168 and 169: 378 DIAGNOSTICS & TESTING 09-200�
- Page 170 and 171: 386 AIR CONDITIONING ����
- Page 172 and 173: 416 SHOP EQUIPMENT SHOP EQUIPMENT L
- Page 174 and 175: 431 SHOP EQUIPMENT JSA350MAC 3-1/2
- Page 176 and 177: 455 SHOP EQUIPMENT SHOP EQUIPMENT T
- Page 178 and 179: 469 SHOP ACCESSORIES CR600B BIG BED
- Page 180 and 181: 468 SHOP ACCESSORIES SHOP EQUIPMENT
- Page 182 and 183: 468 SHOP ACCESSORIES SHOP EQUIPMENT
- Page 184 and 185: 470 SHOP ACCESSORIES CR275B FOLD-AW
- Page 186 and 187: 471 SHOP ACCESSORIES SC300-BLK BLAC
- Page 188 and 189: 473 SHOP ACCESSORIES CORRECTION LIG
- Page 190 and 191: 479 SHOP ACCESSORIES SHOP EQUIPMENT
- Page 192 and 193: 484 SHOP ACCESSORIES FL452 1AA LED
- Page 194 and 195: 486 SHOP ACCESSORIES TL4762 24 LED
- Page 196 and 197: ��� ��������
- Page 198 and 199: 486 SHOP ACCESSORIES SHOP EQUIPMENT
- Page 200 and 201: 487 SHOP ACCESSORIES STINGER75882 R
- Page 202 and 203: ��� ��������
- Page 204 and 205: 490 SHOP ACCESSORIES HARLEY-DAVIDSO
- Page 206 and 207: 491 SHOP ACCESSORIES S0620X CLEAR L
- Page 208 and 209: ��� ��������
- Page 210 and 211: 497 SHOP ACCESSORIES SHOP EQUIPMENT
- Page 212 and 213: 498 SHOP ACCESSORIES SHOP EQUIPMENT
- Page 214 and 215: 499 SHOP ACCESSORIES ����
- Page 216 and 217: 519 PAINT & BODY AUTO BODY REPAIR T
- Page 218 and 219: 526 PAINT & BODY LT32922 EASY WEDGE
- Page 220 and 221: 528 PAINT & BODY SHOP EQUIPMENT SB2
- Page 222 and 223: 529 PAINT & BODY UPHOLSTERY TOOLS
- Page 224 and 225: 531 PAINT & BODY Shatter Seal • S
- Page 226 and 227: 531 PAINT & BODY Paint Booth Mask
- Page 228 and 229: 531 PAINT & BODY 3873-1001 Seat Cov
- Page 230 and 231: 531 PAINT & BODY 3873-1102 Paper/Po
- Page 232 and 233: 532 PAINT & BODY BT55 BODY CLIP TOO
- Page 234 and 235: ��� ��������
- Page 236 and 237: ��� ��������
- Page 238 and 239: ��� ��������
- Page 240 and 241: ��� ��������
- Page 242 and 243: ��� ��������
- Page 244 and 245: 564 SPECIALTY TOOLS SHOP EQUIPMENT
- Page 246 and 247: 568 SPECIALITY MWHP616 GM WATER PUM
- Page 248 and 249: 585 SPECIALTY TOOLS SHOP EQUIPMENT
- Page 250 and 251: 590 SPECIALTY TOOLS SHOP EQUIPMENT
- Page 252 and 253: ��� ��������
- Page 254 and 255: ��� ��������
- Page 256 and 257: 593 SPECIALTY TOOLS SHOP EQUIPMENT
- Page 258 and 259: 602 BATTERY & RADIATOR SHOP EQUIPME
- Page 260 and 261: 604 ����������
- Page 262 and 263: 606 BATTERY & RADIATOR SHOP EQUIPME
- Page 264 and 265: BC850A BATTERY LIFTER/CARRIER LIFTE
- Page 266 and 267: 608 BATTERY & RADIATOR SHOP EQUIPME
- Page 268 and 269: 611 BATTERY & RADIATOR UCT750B SMAR
- Page 270 and 271: 612 BATTERY AND RADIATOR RB727A REF
- Page 272 and 273: 614 BATTERY & RADIATOR SHOP EQUIPME
- Page 274 and 275: 614 BATTERY & RADIATOR SHOP EQUIPME
- Page 276 and 277: ��� ��������
- Page 278 and 279: 621 BRAKE & WHEEL �����
- Page 280 and 281: ��� ��������
- Page 282 and 283: ��� ��������
- Page 284 and 285: 628 ����������
- Page 286 and 287: 634 INDEX 71410 AXLE POPPER WEDGE A
- Page 288 and 289: 636 BRAKE & WHEEL SHOP EQUIPMENT CC
- Page 290: ��� ��������