MRD 1 & 2 Cylinder Unshielded Nomenclature

MRD 1 & 2 CYLINDER UNSHIELDED NOMENCLATURE




Illustration #Part #MRD1AMRD2A Description Of Part Quanity Used
1NT 6-12------ NUT, hexagon - magnet rotor shaft (without coupling) 1
2WA 5-12------ WASHER, lock - magnet rotor shaft (without coupling) 1
3a PK 5238------SEAL, dust - base mounted magneto 1
3bPK 5237------ Seal, oil - flange mounted magneto 1
4aHG 52536HG 52536HG 52534 HOUSING, magneto - 45mm base mounting - includes illustrated parts 6 on MRD1A and 5 & 6 on MRD2A 1
4bHG 52538HG 52538HG 52541 HOUSING, magneto - 35mm base mounting - includes illustrated parts 6 on MRD1A and 5 & 6 on MRD2A 1
4AGA 52155------ GASKET, vertical flange mounting magneto 1
4Bsee Part VariationsHG 52537HG 52532 HOUSING, magneto - vertical flange mounting - includes illustrated parts 6 on MRD1A and 5 & 6 on MRD2A 1
4CHG 52539HG 52539HG 52540 HOUSING, magneto - horizontal flange mounting - includes illustrated parts 6 on MRD 1 A and 5 & 6 on MRD2A 1
5PN 1056------ PIN, locating - distributor plate 2
6PN 1001------ PIN, locating - breaker plate 1
X7aSC 1519 ------SCREW, fastening - ventilator cover 2 per cover
7bsee Part Variations------ SCREW, fastening - ventilator plate 2 per plate
8aCV 52324------ COVER,ventilator 2
8bCV 52324 ------COVER,ventilator 1
8cPL 52441------ PLATE, covering ventilator 2
8dPL 52525 ------PLATE, covering - ventilator 1
9 GA 52216------GASKET,ventilator 2
10SC 1334 ------SCREW, set coil 2
11CL 51237------ COIL ASSEMBLY, complete - includes illustrated parts 12 and 14 1
12SP 52289SP 52291SP 52289 SPRING, coil contact 1
14CB 52199-------- CABLE, coil 1
16IS 222-------- WASHER, insulation - magnet rotor ball bearing 1 per ball bearing
17IS 52266-------- STRIP, insulation - magnet rotor ball bearing 1 per ball bearing
18aBB 60226-------- BEARING, ball - magnet rotor 1
18bBB 60226 --------BEARING, ball - magnet rotor 2
19WA 52231 --------WASHER, grease retaining - magnet rotor ball bearing 1
20 WA 1513--------WASHER, spacing - magnet rotor 2
21KY 11-4 --------KEY, Woodruff - magnet rotor 1
22asee Part VariationsRT 52286RT 52298 ROTOR, magnet - clockwise rotation 1
22bSee Part Variations RT 52287RT 52299ROTOR, magnet - counter-clockwise rotation 1
23aWA 61 --------WASHER, equalizing - magnet rotor shaft (.012" thick) as required
23bWA 106-------- WASHER, equalizing - magnet rotor shaft (.007" thick) as required
23c WA 107--------WASHER, equalizing - magnet rotor shaft (.004" thick) as required
23dWA 1009-------- WASHER equalizing - magnet rotor shaft (.002" thick) as required
24aBK 52300-------- BREAKER PLATE ASSEMBLY, complete - includes illustrated parts 25, 26, 28 to 30a, 31„ and 34 to 39 1
24bBK 52302-------- BREAKER PLATE ASSEMBLY, complete - includes illustrated parts 25, 26, 30b, 31, and 34 to 39 1
25SC 1132-------- SCREW AND LOCKWASHER, fastening - condenser lead and breaker lever spring 1
26 CW 5279--------CONDENSER, complete 1
28BG 52160-------- BEARING, breaker plate 1
29PK 5217-------- WICK, felt - lubricating breaker plate bearing 1
30aBK 52157-------- PLATE, breaker - includes illustrated parts 28 and 29 1
30bBK 52302 --------PLATE, breaker - only 1
X31WK 5263 --------WICK, felt - cam lubricating… 1
34 --------BRACKET ASSEMBLY, contact point - includes illustrated parts 38 and 39 1
35EC 1099 --------CLIP, terminal - coil cable retaining 1
36SC 1132-------- SCREW AND LOCKWASHER, fastening - contact point bracket assembly and condenser 3
37WA 72613-------- WASHER, plain - lower contact point bracket fastening screw 1
38WA 1333-------- WASHER, contact lever stud… 1
39SP 1074 --------SPRING, ring - contact lever stud 1
41SC 1230-------- SCREW AND LOCKWASH, fastening - breaker assembly 3
43GA 5261-------- GASKET, distributor plate 1
44BR 563----BR 563 BRUSH WITH SPRING, distributor plate 1
45 DP 52520----DP 52520PLATE, distributor - includes illustrated part 47 1
45ADP 52524DP 52697---- PLATE, distributor 1
45B ---WA 1102----WASHER, plain - distributor plate cable 1
45C--- NT 5232----NUT, insulation - distributor plate cable 1
46aCB 52185-------- CABLE ASSEMBLY, high-tension - includes illustrated parts 45B, 45C and 54. 1
46bCB 52182-------- CABLE ASSEMBLY, high-tension - includes illustrated part 54. 1
46c--- --------CABLE ASSEMBLY, high-tension - (25" long) - includes illustrated part 54 1
47A -------IS 76562INSULATION, high-tension cable as required
47WA 52232----WA 52232 WASHER, felt - distributor plate 1
48ART 52288 ----RT 52288ROTOR, distributor 1
48GA 52145 ----GA 52145GASKET, distributor plate cap 1
49DP 52560----DP 52521 CAP, distributor plate… 1
50 SC 1528----SC 1528SCREW, WASHER AND LOCKWASHER, fastening - distributor plate cap 3
52SC 1529SC 1524SC 1529 SCREW, WASHER AND LOCKWASHER, fastening - distributor plate (upper) 2
53SC 1530SC 1524SC 1530 SCREW, WASHER AND LOCKWASHER, fastening - distributor plate (lower) 2
54FP 81953 --------terminal - cable CLIP 1 per cylinder
55SD 52194-------- STUD, grounding… 1
58CB 52211 see Part Var.-------- CABLE ASSEMBLY, grounding 1
60 WA 1543--------WASHER, insulation - grounding stud1
61IS 51478-------- WASHER, insulation - grounding stud 1
62IS 52479 --------BUSHING, insulation - grounding stud 1
63 WA 1278--------WASHER, insulation - grounding stud 1
64WA 72613-------- WASHER, plain - grounding stud 1
65WA 6-4 --------WASHER, lock - grounding stud 1
66NT 3-4CA --------NUT, fastening - grounding stud 2
67WA 21-4 --------WASHER, shakeproof - grounding stud 2
68 EC 5268---------SPRING WITH KNOB, grounding 1
69SC 1380 --------SCREW, blocking 1
**1see Part Variations --------IMPULSE COUPLING ASSEMBLY - for parts and illustration, see Coupling Section… 1

**Not Illustrated




MRD 1 & 2 CYLINDER PARTS LIST FOR BASIC TYPE UNSHIELDED MAGNETOS

1, 2, 101, 102 - 45mm Base Mounting 31, 32, 301, 302 - Vertical Flange Mounting

51, 52, 501, 502 - 35 mm Base Mounting 41, 42, 401, 402 - Horizontal Flange Mounting

"E" Gap: 1-2 mm Point Opening: .014-.018"

Magneto type designations ending in odd numbers denote CCLW rotation as viewed from the drive end. Magneto type designations ending in even numbers denote CLW rotation as viewed from the drive end.

Basic magnetos having type designations in the 100 and 500 Series (Examples: MRD1A101 & MRD2A502)aresupplied with ICB2A1 or 2 impulse couplings depending on rotation.

Basic magnetos having type designations in the 300 and 400 Series (Example: MRD2A301 & MRD1 A401) are supplied with ICA2A1 or 2 impulse couplings, depending on rotation.

Basic magnetos having type designations ending in one or two digit numbers (Examples: MRD1A2, & MRD2A31) are not supplied with impulse couplings.

The part, or parts, affected by this reissue is indicated by a X at the left of the illustration number.

STANDARD BASIC MAGNETO PARTS

Ill. #Part #Ill. #Part #Ill. #Part #Ill. #Part #
1NT 6-1216IS22228BG 5216055SD 52194
2WA 5-1217IS 5226629PK 521758CB 52211
3aPK 523818aBB 6022630BK 5215760WA 1543
3bPK 523719WA 52231*31WK 526361IS 51478
4AGA 5215520WA 151334BK 5220362IS 52479
5PN 105621KY 11-435EC 109963WA 1278
6PN 100123aWA 6136SC 114364WA 72613
*7aSC 151923bWA 10637WA 7261365WA 6-4
8aCV 5232423cWA 10738WA 133366NT 3-4CA
9GA 5221623dWA 100939SP 107467WA 21-4
10SC 133424aBK 5230041SC 123068EC 5268
11CL 5123725SC 113243GA 526169SC 1380
14CB 5219926CW 527954FP 81953

NOTE: On basic magnetos, grounding spring (Ill. # 68) is assembled on the left hand side of the magneto housing as viewed from the drive end.


BASIC MAGNETO PART VARIATIONS

Ill. #MRD1AMRD2A
4aHG 52536HG 52534
4bHG 52538HG 52541
4BHG 52537HG 52532
4CHG 52539HG 52540
12SP 52291SP 52289
22aRT 52286RT 52298
22bRT 52287RT 52299
44---BR 563
45---DP 52520
45ADP 52697---
45BWA 1102---
45CNT 5232---
47A---IS 76562 HG 52534
47---WA 52232
48A---RT 52288
48---GA 52145
49---DP 52521
50---SC 1528
52SC 1524SC 1529
53SC 1524SC 1530

ALL OTHER ILLUSTRATED PARTS USED ON VARIATIONS OF THESE MAGNETOS.




SERVICE PARTS LIST

For 1 Cylinder Non-Basic Unshielded Magnetos
MAGNETO CODE

Part variations within the following group of magnetos are indicated by a code number, or a combination of code numbers, in the "Magneto Code" column.
Example: Illustration number 5, part number PN 1056--- distributor plate locating pin, is applicable to magnetos 14 and 15 only, namely MRD1A314 and MRD1A316.



Code #MRD Mag VarMRD Basic MagInstallation #Customer NameUsed on Engine Model
11A71A1H 7Roth Mfg. Co.Steam Generators, Gas Engine Models-
21A81A2H 8Homestead Valve Co.Steam Jenny
31A101A2H 1010Roth Mfg. Co.Steam Generators, Gas Engine Models
41A111A1H 1011Roth Mfg. Co.Steam Generators, Gas Engine Models
51A121A2H 1012Roth Mfg. Co.Steam Generators, Gas Engine Models
61A161A2H 116Koehring Waterous Ltd.--
71A4711A41H 147Electro Diesel de Mexico-
81A108(*2)1A102H 118Caterpillar Tractor Co.-
91A110(*2)1A102H 120Caterpillar Tractor Co.-
101A112(*2)1a102H 122H. M. PetersonRotary Internal Combustion
111A3071A301H 1307Witte Engine Works-
121A308 (*1)1A302H 1308White Roth Machine Corp.L, 0
131A309(*2)1A301H 1309Witte Engine Works-
141A314(*2)1A302H 1314Novo Engine Co.BA 23
151A316(*2)1A302H 1316Novo Engine Co.DA 33
161A407(*1)1A401H 1407Witte Engine WorksB-5X6, C-6X8
171A408(*1)1A402H 1408Motors Nacionales S.A.MONAC models 325 HP, 729 HP
181A409(*2)1A401H 1409Climax Engineering Co.C-46, C-66, C-96
191A411(*2)1A401H 1411-ZC-346, ZC503 (Fairbanks Morse)
201A412(*2)1A402H 1412-Z (Fairbanks Morse)
211A413(*3)1A401H 1413Witte Engine Works98



Part Variations

Ill. #Part #Mag CodeIll. #Part #Mag Code
3aPK 52374, 545DP 5252014, 15
4aHG 526011, 3, 4, 545ADP 5252418
4BHG 526561146aCB 521852
4BHG 526071246bCB 5218214, 15
4BHG 526261347WA 5223214, 15
4BHG 5253214, 1548ART 5228814, 15
4cHG 525447, 16, 1748GA 5214514, 15
4cHG 525451849DP 5256014, 15
4cHG 5254319, 2050SC 152814, 15
4cHG 526752152SC 152914, 15
5PN 105614, 1553SC 153014, 15
7bSC 124-8CA8, 958CB 5221812, 21
7bSC 138121**1ICB 2A2 10 deg8
8bCV 5232421**1ICB 2A2 15 deg9
8cPL 524418, 9**1ICB 2A80 0 deg10
8dPL 5252521**1ICA 2A1 10 deg11
12SP 5228914, 15**1ICA 2A2 12 deg12
18bBB 602266**1ICA 2A43 10 deg13
22aRT 523122, 6, 10**1ICA 2A2 20 deg14
22aRT 522163**1ICA 2A24 20 deg15
22aRT 5229014**1ICA 2A27 30 deg16
22aRT 5231615**1ICA 2A36 15 deg17, 20
22bRT 523011**1ICH 2A5 25 deg18
24bBK 523056**1ICA 2A35 15 deg19
30bBK 523026**1ICH 2A19 7 deg21
44BR 56314, 15---


FOR ALL OTHER REQUIRED PARTS, REFER TO THE APPLICABLE BASIC MAGNETO
*1. Grounding spring assembled on right hand side of magneto housing as viewed from drive end.
*2. Grounding spring assembled on left hand side of magneto housing as viewed from drive end.
*3. Grounding terminal and ventilator cover (Ill. # 8b) assembled on right hand side of magneto housing with the ventilator covering plate (Ill. # 8d) and ventilator gasket (Ill. # 9) assembled to left hand side of housing, as viewed from the drive end.
**1 Not Illustrated.


For 2 Cylinder Non-Basic Unshielded Magnetos

MAGNETO CODE

Part variations within the following group of magnetos are indicated by a code number,or a combination of code numbers, in the "Magneto Code" column.

EXAMPLE: Illustration number 8c, part number PL 52441 - ventilator covering plate,is applicable to magneto 1 only, namely MRD 2A107.




Code

Number

MRD

Magneto

Variation

MRD

Basic

Magneto

Installation

Number

Customer

Used On

Engine Model

1

2A1071

2A101

H 217

Caterpillar Tractor Co.

D50, DG5, D70, D75 starting engines for D9900 power unit

2

2A3072-3

2A301

H 2307

Hercules Motors Corp.

BXH

3

2A3182

2A302

H 2318

Hercules Motors Corp.

NXA, NXB

4

2A3201

2A302

H 2320

Novo Engine Co.

CWR-47, CWR-66

5

2A3222

2A302

H 2322

Wisconsin Motors Corp.

TF

6

2A4094

2A401

H 2409

Caterpillar Tractor Co.

Experimental Engines

 

 

PART VARIATIONS

 

Ill.

Number

Part

Number

Magneto Code

Ill.

Number

Part Number

Magneto Code

4B

HG 52542

3

58

CB 52218 3,5

3, 5

4C

HG 52655

G

**1

ICB 2A1- 30'

1

7b

SC 124-8CA

1

------

ICA 2A5 -10°

2

8c

PL 52441

1

------

ICA 2A10 -10°

3

22a

RT 52294

4, 5

------

ICA 2A24 - 20'

4

46b

CB 52183

4

------

ICA 2A82 - 30°

5

c

CB 52184

4

-------

ICA 2A1-15°

6

 

 

 

FOR ALL OTHER REQUIRED PARTS, REFER TO THE APPLICABLE BASIC MAGNETO.

1.Grounding spring assembled on left side of magneto housing as viewed from drive end.

2.Grounding spring assembled on right hand side of magneto housing as viewed from drive end.

3. Gear #51019A (not supplied by American Bosch) is assembled to this magneto.

4.Grounding terminal assembled on right hand side of magneto housing as viewed from drive end.

**Not Illustrated




END