1998 Yamaha E48T / C55T Outboard Motor Factory Service Manual (P/N 696-28197-Z4-11)
Yamaha Models Covered & Key Technical Specifications
Models: Yamaha E48C, E55C, 55BM, 55BE, 55BEM, 55BET, E48MH, C55ER, C55TR
Sub-models / Variants: Manual start tiller, Electric start tiller, Electric start remote control, Power trim and tilt models
Model Years: 1994–1998 (1994 1st Edition reference)
Serial Numbers: E48C 010831~, 377728~; E55C 272904~; 55BM 252001~; 55BE 004803~, 329002~; 55BEM 502490~; 55BET 721947~
Technical Data:
- Engine type: 2-stroke, inline 2-cylinder
- Total displacement: 760 cm³ (46.4 cu. in)
- Bore x stroke: 82 x 72 mm (3.2 x 2.8 in)
- Compression pressure: 637 kPa (91.2 psi) for E48/E55; 912 kPa (129.7 psi) for 55B variants
- Fuel system: 2-carburetor, loop charge, reed valve
- Ignition system: CDI
- Gear oil capacity: 500 cm³ (16.9 US oz)
- Lighting output: 12V-80W or 12V-6A depending on model
Yamaha Manual Features & Content Preview
- Official 101-page Yamaha OEM publication (P/N 696-28197-Z4-11, first edition September 1994)
- Documents internal engine specifications and chassis details for the 1994–1998 Yamaha E48T and C55T 2-stroke inline-twin outboard motors
- Contains 46 exploded-view assembly diagrams and 35 detailed maintenance specification tables
- Serves as the foundational reference detailing the transition between mechanical and electronic engine components on the E48 and C55 series
Manual Content Summary
This publication organizes essential technical procedures into focused chapters covering General Information, Specifications, and Periodic Inspection and Adjustment. It outlines the foundational requirements for routine maintenance, offering targeted data on fuel system diagnostics, ignition timing, and electrical system analysis. You will also find a structured framework for engine and lower unit diagnostics, along with bracket unit adjustments. Because servicing marine power units carries inherent risks, always verify proper safety protocols and consult certified professionals before starting complex overhauls. The layout and technical depth are explicitly designed for users with a solid foundation in marine mechanics, streamlining daily workshop routines.
Technical Specification Preview
The specifications chapter details critical tolerances for internal engine components. Piston-to-cylinder clearance ranges between 0.065 and 0.070 mm, while cylinder head warpage limits max out at 0.1 mm. Tightening torque values are laid out clearly for all primary fasteners to prevent assembly errors. For example, cylinder head bolts require 15–30 Nm, and flywheel nuts must be torqued to a precise 160 Nm. The intake reed valve stopper height is specified at 3.0 mm for the E48C and 9.9 mm for C55 variants. Additionally, gear oil capacity for the lower unit is documented at 500 cm³. Having these exact figures on hand eliminates guesswork during complete power unit rebuilds and routine seasonal servicing.
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