Murphy Portable Generator MP3298 User Manual

MP-8802N  
Revised 03-02  
Section 20  
Magnetic Pickup Installation Instructions  
(00-02-0181)  
Models: MP3298, MP7905, and MP7906  
Please read the following information before installing. A visual inspection of this product for damage  
during shipping is recommended before mounting. These instructions are intended for MP3298, MP7905, and MP7906 models.  
GENERAL INFORMATION  
Gap Chart  
THREAD  
SIZE  
TURN  
1/2  
1/4  
3/4  
1
WARNING  
BEFORE BEGINNING INSTALLATION OF THIS MURPHY PRODUCT  
.013 in.  
.028 in.  
.035 in.  
.055 in.  
5/8-18 UNF  
(0.33 mm) (0.71 mm)  
.015 in. .030 in.  
(0.38 mm) (0.76 mm) (1.14 mm) (1.57 mm)  
(0.88 mm) (1.39 mm)  
.045 in. .062 in.  
3/4-16 UNF  
Disconnect all electrical power to the machine.  
Make sure the machine cannot operate during installation.  
Follow all safety warnings of the machine manufacturer.  
Read and follow all installation instructions.  
Typical Installation  
Magnetic Pickup Installation (see diagram below)  
Drill and tap a hole in the flywheel housing (See Specifications for  
model and thread size). IMPORTANT: Drilling too deep may damage  
ring gear teeth. Blow chips with air hose when drilling and tapping hole.  
Description  
Gap Adjustment  
Insert magnetic pickup and turn until it stops at  
the face of the gear. Back-off the gear by turn-  
ing the pickup counter-clockwise 1/4, 1/2, or  
A magnetic pickup is an AC generator. It is normally installed into the fly-  
wheel housing of an internal combustion engine, so that the starter ring  
gear acts upon it to generate a voltage pulse each time a gear tooth passes  
the end of the sensor.  
1/4  
3/4 turn (drawing right)  
.
See Gap Chart below to determine gap distance  
based on the turn. Check gap clearance by  
rotating the gear completely around.  
Specifications  
Housing Material:  
1/2  
3/4  
MP3298: Type 300 Stainless Steel.  
NOTE: Magnetic pickup gap should be adjusted so  
that the minimum voltage required is attained at the engine’s lowest  
RPM. The voltage will increase as the speed increases.  
Locknut: Type 300 Stainless Steel.  
MP7905 and MP7906: Type 6061 Aluminum/Anodize Class 1.  
Locknut: Steel Nickel Plated.  
If erratic readings occur, remove magnetic pickup and check the  
magnetic tip for metal chips.  
Output Leads (all models): Two insulated leads, 20AWG, STR/TEF  
insulated per MIL-W-16878D Type E, 1 White and 1 Black.  
Output Voltage (all models): 200 V.P.P. TYP. (tested at 1000 I.P.S.  
20 Pitch gear, 0.005 Gap., and 100K OHM Load).  
Coil Resistance:  
Always use a two-conductor shielded cable. Ground the  
shield to a metal frame ground at the engine end only.  
Never run these wires  
next to spark plug wires  
or in wire loom with other  
wires carrying inductive  
MP3298: 975 Ohms TYP.  
MP7905 and MP7906: 2500 Ohms TYP.  
Potting (all models): Internal portion of pickup is filled with epoxy resin,  
making the magnetic pickup oil and moist resistant.  
Temperature (all models): -65° to +225°F (-54 ° to 107°C).  
Coil Induct.:  
loads or alternating current.  
LOAD  
Tach  
Speed  
Switch  
After adjusting,  
set lock-nut.  
Drill and tap casing  
AC  
(see thread sizes in  
Meter  
Specifications).  
MP3298: 800 mH max, @ 1K Hz.  
AC Meter  
Reading must  
be taken at load.  
MP3298: 400 mH TYP. @ 1K Hz.  
Pickup Part  
Model Number Length  
Total  
Threaded  
Length  
Thread  
Size  
Gap  
(see Gap Chart)  
Casing  
MP3298 20700162  
MP7906 20700161  
MP7905 20700160  
3 in. (76 mm)  
3 in. (76 mm)  
3 in. (76 mm)  
3 in. (76 mm)  
5/8-18 UNF  
3/4-16 UNF  
Gear (must be made  
of magnetic material).  
NOTE: Clean gear casing  
4-1/2 in. (114 mm) 4-1/2 in. (114 mm) 3/4-16 UNF  
and magnetic sensor  
of metal chips or filings.  
MP-8802N page 1 of 2  
 

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