Case Engine 668T/E2 and 668T/M2 Service Manual PDF

This workshop manual covers the Case 668T/E2 and 668T/M2 engines. It provides technical information, service specifications, and step-by-step procedures for engine disassembly, inspection, overhaul, adjustment, and reassembly. The manual covers the F4GE0684F and F4HE0684J engine models, with detailed instructions for servicing major mechanical components.

The procedures are intended for qualified service personnel. Follow the manufacturer's instructions, observe the specified clearances and tightening torques, and use the recommended special tools where required.

Service and Repair Coverage

The manual covers the engine crankcase, crankshaft, connecting rods, pistons, piston rings, camshaft, cylinder head, valves, valve seats, and valve guides. It includes inspection and measurement procedures, component wear checks, bearing clearance measurements, piston protrusion checks, and valve timing adjustments.

The lubrication and cooling sections describe the oil pump, oil sump, heat exchanger, water pump, and related components. Fuel system coverage includes fuel filters, prefilters, mechanical feed pumps, injection pumps, injectors, and fuel supply operation. The manual also addresses oil vapour recirculation and auxiliary component drives.

The overhaul procedures explain engine disassembly and reassembly, replacement of seals and bushings, crankshaft and connecting rod inspection, piston and cylinder assembly installation, cylinder head servicing, valve grinding, and valve seat reconditioning. Additional instructions cover flywheel ring gear replacement, injection pump installation and timing, rocker arm assembly servicing, injector replacement, tappet clearance adjustment, and the removal of EDC7 components on the F4HE0684J engine.

This manual is a useful reference for engine overhaul, mechanical repairs, component inspection, and maintenance of compatible Case 668T engine models.

Table of Contents:

ENGINES
F4GE0684F - F4HE0684J OVERHAUL
INDEX
Engine coding
Main engine features
Assembling play / specifications
Tightening torque
Tools
Graphic indications and symbols
General remarks
Engine F4GE0684F
Engine F4HE0684J
Description of main mechanic engine components
Crankcase
Drive shaft
Drive shaft seal rings
Connecting rods
Pistons
Distributing shaft
Engine F4GE0684F valve control
Engine F4HE0684J valve control
Engine F4GE0684F cylinder head
Engine F4HE0684J cylinder head
Engine F4GE0684F valves and valve seats
Engine F4HE0684J valves and valve seats
Engine F4GE0684F valve guides
Engine F4HE0684J valve guides
Valve control bridges F4HE0684J
Grinding cylinder head valve seats F 4HE0684J
Engine flywheel
Engine F4GE0684F auxiliary component drive
Engine F4HE0684J auxiliary component drive
Engine F4GE0684F Lubrication
Engine F4HE0684J Lubrication
Heat exchanger
Oil pump
Engine F4GE0684F oil sump
Engine F4HE0684J oil sump
Engine F4GE0684F oil vapour recirculation
Engine F4HE0684J oil vapour recirculation
Engine F4GE0684F cooling
Engine F4HE0684J cooling
Water pump
Engine F4GE0684F mechanic injection feeding system
Fuel prefilter
Fuel filters
Mechanic fuel pump
Engine F4GE0684F Injection assembly
Engine F4HE0684J fuel supply system
Engine F4HE0684J fuel system diagram
Fuel prefilter
Fuel filter
Mechanical feed pump
Normal operating condition
Outlet overpressure condition
Bleed conditions
High pressure pump
Operating principle
Engine F4GE0684F bench-overhaul
Disassembling the engine
Replacing the seal ring
Removing the injection pump
Removing the rocker arm assembly
Repair work on cylinder cluster
Checks and measurements
Checking the surface supporting the head on the cylinder cluster
Valve gear
Distributing shaft
Checking the eccentric lift and the pin alignment
Bushings
Replacing the bushings
Tappets
Mounting the tappets – Distributing shaft
Drive shaft
Measuring the journals and crankpins
Replacing the oil pump drive gears
Mounting the main bearings
Measuring the journal assembling play
Checking the drive shaft shoulder play
Connecting rod-piston assembly
Pistons
Measuring the piston diameter
Piston pins
Conditions for correct pin/piston matching
Piston rings
Connecting rods
Bushings
Checking the connecting rods
Checking the torsion
Checking the flexion
Mounting the connecting rod-piston assembly
Connecting rod-piston match
Mounting the piston rings
Mounting the connecting rod/piston assemblies in the cylinder liners
Measuring the crankpin assembling play
Checking piston protrusion
Valve gear
Distribution gearbox case
Valve timing
Injection pump – 1st phase
Timing
Flywheel cover case
Engine flywheel
Replacing the engine flywheel ring gear
Injection pump – 2nd phase
Mounting the injection pump – 2nd phase
Mounting the oil and water pumps
Mounting the oil sump
Mounting the water / oil heat exchanger
Cylinder head
Removing the valves
Checking the cylinder head supporting surface
Checking the cylinder head water seal
Valves
Valve descaling, check and grinding
Checking the play between the valve stem, valve guide and valve centring
Valve guide
Valve seats
Valve seat reconditioning – replacement
Valve springs
Mounting the cylinder head
Reattaching the cylinder head
Rocker arm assembly
Mounting the injectors
Replacing the injectors
Removal
Reassembling
Adjusting the tappets
Rocker arm removal/reassembling
Removal
Reassembling
Valve timing
Removal of EDC7 components F4HE0684J
Disassembly of the engine
Repair interventions
Cylinder group
Controls and measurements
Cam lift check and pin alignment check
Bushes
Head face check on the cylinder group
Timing system
Camshaft
Bush replacement
Tappets
Fitting tappets – camshaft
Output shaft
Measuring journals and crankpins
Replacing oil pump control gear
Fitting main bearings
Finding journal clearance
Checking output shaft shoulder clearance
Connecting rod – piston assembly
Pistons
Measuring piston diameter
Piston pin diameter
Conditions for proper pin-piston coupling
Split rings
Connecting rods
Bushes
Checking torsion
Checking connecting rods
Checking bending
Fitting connecting rod-piston assembly
Connecting rod-piston coupling
Fitting split rings
Fitting connecting rod-piston assembly into cylinder barrels
Finding crankpin clearance
Checking piston protrusion
Timing
Flywheel housing
Engine flywheel
Replacing engine flywheel ring gear
Cylinder head
Removing the valves
Removing carbon deposits, checking and grinding valves
Checking cylinder head supporting surface
Valves
Removing carbon deposits, checking and grinding valves
Checking clearance between valve stem and valve guide and valve centering
Valve guide
Valve seats
Regrinding – replacing the valve seats
Valve springs
Fitting cylinder head
Refitting the cylinder head
Fitting injectors
Rods
Rocker assembly
Tappet clearance adjustment
Harness support

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