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Delco Remy 37MT, Diagnostic Procedures Manual

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Delco Remy 37MT Diagnostic Procedures Manual Download Page 12

PRELIMINARY DIAGNOSIS FLOW
CHART

2-2. UNDERCHARGE SYMPTOMS

• Slow or no cranking
•  Low voltmeter reading
•  Dim lights/slow turn signal flashers

2-2

CHARGE BATTERIES

LOOSE

CHECK DRIVE BELT

MISSING

TIGHTEN BELT
TO MFG.
TENSION SPECS

OK

OK

CHECK PULLEYS
FOR LOCKED
BEARINGS

OK

OK

LOCKED

REPLACE BELT

REPAIR DEFECTIVE
COMPONENT

SLOW

CRANK ENGINE

OK

OK

START VEHICLE

CK. ALTERNATOR
VOLTAGE & OUTPUT
(PAGE  3-8)

OK BUT
DISCHARGED

CK. CRANKING
CIRCUIT
PAGE (3-2)

DEFECTIVE

DEFECTIVE

REPAIR AND
VERIFY REPAIR

CK. STARTER
SOLENOID
 CIRCUIT
(PAGE  3-4)

SEE STARTER
REPLACEMENT
DETERMINATION
(PAGE 3-6)

REPAIR WIRING
CIRCUIT - VERIFY
REPAIR

CK. ALTERNATOR
VOLTAGE & OUTPUT
(PAGE 3-8)

TEST BATTERIES
(PAGE 3-1)

OK

new diagnostic manual  4/5/05  9:47 AM  Page 2-2

This document, and more, is available for download from Martin's Marine Engineering Page - www.dieselduck.net

Summary of Contents for 37MT

Page 1: ...Diagnostic Procedures Manual new diagnostic manual 4 5 05 9 47 AM Page u This document and more is available for download from Martin s Marine Engineering Page www dieselduck net ...

Page 2: ...rcuit Test 3 4 3 18 Magnetic Switch Circuit Test 3 6 3 21 Starter Replacement Determination 3 6 3 26 Alternator Wiring Test 3 7 3 29 Alternator Replacement Determination 3 8 3 33 Completion of All Tests 3 9 IV SUMMARY 4 1 V APPENDIX 5 1 Overcrank Protection OCP Circuit Check 5 1 5 2 Multi Battery Charging with Series Parallel Chargers 5 1 5 3 Group Charging on Current Limiting or Series Chargers 5...

Page 3: ...e what caused the symptoms Actual adjustment repair or replacement procedures are provided in unit specific service bulletins and manuals 1 5 For educational purposes study of this entire manual is recommended For diagnostic purposes the flow charts in Section II will reference appropriate procedures for specific symptoms 1 6 EQUIPMENT REQUIRED To perform the tests specified in this manual the fol...

Page 4: ...coil of the magnetic switch and back to the battery Excessive loss here can cause a no start complaint 4 Charging Circuit This consists of the wiring between the alternator and the battery and back to the alternator Excessive loss here can cause the batteries to not charge properly As noted above discharged batteries will cause other problems 1 11 SEQUENCE OF PROCEDURES It is important that the pr...

Page 5: ...16 volts 3 24 volt vehicles 0 32 volts NOTE The use of digital voltmeters is highly recommended for the following reasons Digital voltmeters are generally more accurate than analog needle movement instruments Digital readings need no interpretation everyone sees the same number Digital instruments are generally autoranging they automatically select the proper range for the value of the reading Rev...

Page 6: ...type is easy to use cannot be damaged by misconnection and will not damage the vehicle wiring A clamp on ammeter operates by measuring the magnetic flux produced by current flow through a conductor and translating that into amperes which are displayed on the meter readout 1 19 AMMETER USE Figures 1 9 through 1 11 illustrate the use of various types of ammeters 1 Figure 1 9 illustrates the used of ...

Page 7: ...4 illustrate some typical uses of the ohmmeter CAUTION Typical heavy duty electrical system voltage 12 or 24 volts could produce a current flow through the ohmmeter that could damage the meter Never connect an ohmmeter to a circuit that is under voltage Always disconnect the battery ground cable before using the ohmmeter 1 23 As shown in Figures 1 12 and 1 13 the ohmmeter is also useful as a conti...

Page 8: ...s and power the vehicle s electrical accessories and loads 1 27 How well the electrical system components are matched will determine in a large part how effectively and efficiently the system will operate Another important factor in system design is to ensure that system wiring is adequate to carry the current required by each circuit 1 28 HEAVY DUTY SYSTEM BATTERIES The battery or more common bat...

Page 9: ...ng similar to that of Filler Cap batteries Some means of replacing water is necessary and these batteries include a plug strip or individual covers over the filler holes which are removed to add water 3 The Filler Cap Batteries Not so common any more these are lead acid batteries with antimony in the grid alloy The disadvantage of these batteries are that they require frequent servicing Maintenanc...

Page 10: ...Project1 4 5 05 9 07 AM Page 1 This document and more is available for download from Martin s Marine Engineering Page www dieselduck net ...

Page 11: ... THAN 15 5 V INTERNAL VOLTMETER EXTERNAL REGULATOR DEFECTIVE CHECK DASH VOLTMETER OK REPLACE ALTERNATOR USE REG SVC BULLETIN TO ISOLATE DEFECT REPAIR VOLTMETER 120 F OR MORE CK BATTERY TEMP RETEST WITH COOL CHARGED BATTERIES DEFECTIVE TEST BATTERIES PAGE 3 1 REPLACE DEFECTIVE BATTERY COMPLETE COMPLETE 119 OR LESS OK new diagnostic manual 4 5 05 9 47 AM Page 2 1 This document and more is available ...

Page 12: ...PONENT SLOW CRANK ENGINE OK OK START VEHICLE CK ALTERNATOR VOLTAGE OUTPUT PAGE 3 8 OK BUT DISCHARGED CK CRANKING CIRCUIT PAGE 3 2 DEFECTIVE DEFECTIVE REPAIR AND VERIFY REPAIR CK STARTER SOLENOID CIRCUIT PAGE 3 4 SEE STARTER REPLACEMENT DETERMINATION PAGE 3 6 REPAIR WIRING CIRCUIT VERIFY REPAIR CK ALTERNATOR VOLTAGE OUTPUT PAGE 3 8 TEST BATTERIES PAGE 3 1 OK new diagnostic manual 4 5 05 9 47 AM Pag...

Page 13: ...PINION CHECK REPAIR SOLENOID CIRCUIT REPAIR OR REPLACE STARTER DO NOT INSTALL VISUALLY CHECK RING GEAR MILLED TEETH REPLACE RING GEAR AND CHECK FLANGE TO FLYWHEEL DIM CHECK STARTER PER APPROPRIATE SERVICE BULLETIN OK REINSTALL STARTER AND PERFORM CIRCUIT CHECKS SEE PAGE 3 4 REPLACE STARTER AND VERIFY REPAIR REPAIR VERIFIED DEFECTIVE OK new diagnostic manual 4 5 05 9 47 AM Page 2 3 This document an...

Page 14: ...Project1 4 5 05 9 07 AM Page 1 This document and more is available for download from Martin s Marine Engineering Page www dieselduck net ...

Page 15: ...inspection or test as follows a Apply test load of 1 2 CCA rating 0 F in amps b After 15 seconds with load on measure and record battery terminal voltage c Turn load off d Estimate battery temperature and check recorded voltage against following table Temp F 70 50 30 15 0 Min Volts 9 6 9 4 9 1 8 8 8 5 e If recorded voltage does not meet or exceed that in table replace battery Otherwise battery is ...

Page 16: ...rn load off e Check recorded voltage against following table for electrolyte temperature Temp F 70 60 50 40 30 20 10 0 Min Volts 9 6 9 5 9 4 9 3 9 1 8 9 8 7 8 5 f If recorded voltage does not meet or exceed that in table replace battery Otherwise battery is OK 3 6 TEST COMPLETION Clean 1 Cable ends and battery terminals with wire brush Tighten 1 Battery hold downs to specifications NOTICE Leave ba...

Page 17: ...e loss V5 to get total cable loss V3 This loss V3 shall not exceed 12 volt system with 37 MT 40 MT 41 MT or 42 MT starter 0 500 volt maximum voltage loss 12 volt system with 50 MT starter 0 400 volt maximum loss 24 volt system with 37 MT 40 MT 41 MT 42 MT or 50 MT starter 1 000 volt 4 Replace cables or repair circuits with excessive voltage drop 3 9 TEST COMPLETION If temporary 12 volt test connec...

Page 18: ...ire lead to which carbon pile is connected Meter will show battery voltage NOTICE In the following step if the magnetic switch does not close on a 12 volt vehicle perform Magnetic Switch Circuit Test paragraph 3 18 then return to this point in the Starter Solenoid Circuit Test NOTICE In the following step on a 24 volt vehicle if the temporary 12 volt system will not close the magnetic switch bypas...

Page 19: ... record voltage V10 on voltmeter 4 Add voltage loss V10 to voltage loss V9 previously recorded to get total wire voltage loss 5 Total wire voltage loss shall not exceed 12 volt system 0 8 volt 24 volt system 1 8 volt 6 Replace and repair wiring and connections if voltage loss is excessive NOTICE Perform the following test only if the magnetic switch closed in preceding tests 3 16 MAGNETIC SWITCH C...

Page 20: ...tch ground to frame or motor ground terminal With key on push start button and read voltage V 14 If voltage V 14 is within 1 0 volt 2 0 volts for 24 volt system of battery voltage repair magnetic switch ground lead or connections If not replace voltmeter ground lead at magnetic switch ground terminal 5 Repeat step 4 moving voltmeter plus lead to the following locations and measuring the specified ...

Page 21: ... vehicle does not crank properly the problem must be with the starter or the engine Replace the starter and recheck to see if engine cranks properly If not then look for a mechanical problem with the engine 3 26 ALTERNATOR WIRING TEST This procedure is the first step in checking out the charging system The output of the alternator the batteries and the accessory loads with a minimum of voltage los...

Page 22: ...ing circuits are OK conduct the following tests to determine if the alternator must be replaced NOTICE Make sure that alternator mounting hardware is secure and that belts are OK before testing alternator NOTICE Batteries shall have been satisfactorily load tested and must be near full charge with more than 12 4 Volts no load voltage 3 30 ALTERNATOR VOLTAGE OUTPUT TEST Conduct this test at shop te...

Page 23: ...er lead from the battery positive to the alternator relay R or indicator I terminal This procedure applies to both negative and positive ground systems and will restore the normal residual magnetism 4 Repeat steps 1 and 2 If output is still zero replace the alternator 3 32 ALTERNATOR REPLACEMENT Replace alternator if either of the following conditions exist 1 Alternator output voltage exceeds 15 5...

Page 24: ...Project1 4 5 05 9 07 AM Page 1 This document and more is available for download from Martin s Marine Engineering Page www dieselduck net ...

Page 25: ...ified in this manual may seem to be complex and lengthy Actually with practice and experience they become quite simple As maintenance personnel gain confidence and competency with these procedures they may easily become part of routine preventative maintenance Remember two things as you improve your diagnostic efforts with this manual 1 Don t jump to early conclusions 2 Perform the diagnostic proc...

Page 26: ...Project1 4 5 05 9 07 AM Page 1 This document and more is available for download from Martin s Marine Engineering Page www dieselduck net ...

Page 27: ...urrent See Fig 1 for typical hook up With Parallel Chargers the batteries are connected so that the charging current is divided and each battery receives only the charging current it can accept at the charger s voltage See Fig 2 for typical hook up Because of these differences the charging procedures also differ No matter which type of charger is used differences exist between batteries age capaci...

Page 28: ...hydrometer if reading is 1 230 or more test as outlined in Delco Service Bulletin 1B 115 If reading is below 1 230 proceed with charging procedure If fluid level is low add water to bring level sufficiently high for hydrometer readings but not to split ring then proceed with charging After charging add water to split ring B Freedom batteries Check built in hydrometer if clear or yellow replace bat...

Page 29: ...T LOSS V25 ALTERNATOR CIRCUIT LOSS MAX 0 500 V Section 3 15 3 16 STARTER SOLENOID CIRCUIT TEST W 100 AMP LOAD FROM FIGURE 3 6 FIRST WIRE LOSS V9 SECOND WIRE LOSS V10 MAG SWITCH LOSS V11 TOTAL SOLENOID CIRCUIT LOSS MAX 1 00 V AMP LOAD AND MAXIMUM VOLTAGE LOSSES SHOWN AR FOR 12V SYSTEMS Delco Remy is a registered trademark licensed by General Motors Corporation new diagnostic manual 4 5 05 9 48 AM P...

Page 30: ...Notes new diagnostic manual 4 5 05 9 48 AM Page 5 4 This document and more is available for download from Martin s Marine Engineering Page www dieselduck net ...

Page 31: ...Notes new diagnostic manual 4 5 05 9 48 AM Page 5 5 This document and more is available for download from Martin s Marine Engineering Page www dieselduck net ...

Page 32: ... U S A www delcoremy com For Customer Support call 1 800 372 0222 PRINTED ON PROCESSED CHLORINE FREE PAPER National Catalog Managers Association new diagnostic manual 4 5 05 9 47 AM Page t This document and more is available for download from Martin s Marine Engineering Page www dieselduck net ...

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