Models MP3298, MP7905 and MP7906
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FW MURPHY" PRODUCTION CONTROLS Installation of Magnetic PickupsModels MP3298, MP7905 and MP7906 A magnetic pickup is an AC generator. It is normally installed into the flywheel housing of an internal combustion engine. The starter ring gear acts upon it to generate a voltage pulse each time a gear tooth passes the end of the sensor. Magnetic Pickup Installation Model Specifications Housing Material: MP3298: Type 300 Stainless Steel; Locknut: Type 300 Stainless Steel MP7905 and MP7906: Type 6061 Aluminum/Anodize Class 1 Locknut: steel nickel plated Output Leads (all models): Two insulated leads, 20 AWG, 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: 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 moisture-resistant. Temperature (all models): -65° to +225° F (-54° to 107° C) Coil Induct.: MP3298: 800 mH max, @ 1 KHz MP3298: 400 mH TYP @ 1 KHz Flywheel Housing Drill and tap a hole in the flywheel housing (See below for model and thread size). IMPORTANT: Drilling too deep may damage ring gear teeth. Blow chips with air hose when drilling and tapping hole. Drill and Tap Chart Set Gap Adjustment Insert magnetic pickup and turn until it stops at the face of the gear. Back off the gear by turning the pickup counter clockwise 1/4, 1/2 or 3/4 turn. See Gap Chart to determine gap distance based on the turn. Check gap clearance by rotating the gear completely around. 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. If erratic readings occur, remove the magnetic pickup and check the magnetic tip for metal chips. Gap Chart In order to consistently bring you the highest quality, full-featured products, we reserve the right to change our specifications and designs at any time. FW MURPHY product names and the FW MURPHY logo are proprietary trademarks. This document, including textual matter and illustrations, is copyright protected with all rights reserved. (c) 2019 FW MURPHY. A copy of our typical warranty may be viewed or printed by going to www.fwmurphy.com/warranty.

Output Voltage Operating Gear Pitch/Voltage Output Chart Gear Pitch Note: Dash indicates not recommended. Note: Tested at 1000 I.P.S. 20 pitch gear, 0.005 gap and 100K OHM load. FW MURPHY PRODUCTION CONTROLS SALES, SERVICES & ACCOUNTING 4646 S. HARVARD AVE. TULSA, OK 74135 CONTROL SYSTEMS & SERVICES 105 RANDONDYER ROAD ROSENBERG,TX 77471 MANUFACTURING 5757 FARINON DRIVE SAN ANTONIO, TX 78249 DOMESTIC SALES & SUPPORT FW MURPHY PRODUCTS PHONE: 918 957 1000 EMAIL: INFO@FWMURPHY.COM WWW.FWMURPHY.COM FW MURPHY CONTROL SYSTEMS & SERVICES PHONE: 281 633 4500 EMAIL: CSS-SOLUTIONS@FWMURPHY.COM...