Ferrari 348 Workshop Manual 1989–1995 + Mondial t Diagnostics

Ferrari Servizio Assistenza Tecnica workshop manual for the 348 tb and ts, with a Motronic M2.7 Diagnosis Sheet No. 13 covering the 348 and Mondial t with the F 119 D.040 engine. The main mechanical chapters cover the 348; Mondial t coverage is limited to the included ignition/injection diagnostic material.

PDF Search, Bookmarks, and Wiring Detail

Search and diagram navigation: OCR text search works through much of the manual, with recognition errors. The M2.7 insert and electrical schematic section have no searchable text. Embedded bookmarks cover the main chapters and many subsections, although some entries have no working destination. Small labels in the checked wiring diagrams are readable when enlarged; several schematics span four adjoining pages.

One printable 465-page PDF, with the main manual in Italian, English, French, and German. The total includes one cover page and the seven-page M2.7 diagnosis insert, which has English test tables and an Italian/English wiring legend.

Engine, Transaxle, and Electronic System Service

The following selected workshop topics outline the repair coverage rather than reproduce the full contents. Other sections explain driver controls and battery charging and storage.

• Engine repair: Step-by-step procedures for cylinder-head assembly, cam timing, timing-belt installation, and hydraulic leak testing, alongside internal engine inspection and assembly information.

• Clutch and transaxle: Clutch fitting checks, hydraulic release-system bleeding, pedal setup, gearbox removal and overhaul, synchronizers, oil pump, differential, selector shafts, and axle shafts.

• Suspension and steering: Suspension inspection, front and rear wheel-bearing replacement, spring identification, ride-height setup, wheel geometry, balancing, and rack-and-pinion maintenance information.

• Teves ABS MK II: Hydraulic pressure checks, pump and accumulator operation, fault-code interpretation, interconnector test preparation, and control-valve operation checks.

• Fuel and ignition: Bosch Motronic M2.5 component descriptions, idle and emissions adjustments, fuel-delivery tests, sensor signals, and the separate M2.7 diagnostic insert.

• Climate control and electrical: Original R12 system maintenance, functional checks, Ferrari Tester diagnosis, wiring diagrams, torque data, clearances, wear limits, and maintenance schedules.

Suited to technicians familiar with engine overhaul and electrical testing, with access to the specified Ferrari tools and diagnostic equipment.

F119 Engine Inspection and Assembly

The engine tables distinguish F 119 D catalyst and non-catalyst configurations from the U.S.-version F 119 G 040. Internal repair information includes liner classification and fit, main-bearing alignment, crankshaft journal and end-float checks, connecting-rod weight matching, valve-seat and guide work, and camshaft-seat machining.

Tools and valve adjustment: Numbered references identify the AV 2023 engine stand with AM 104116 bracket, AS 4736 alignment bar, AV 1639 liner puller, AS 6236 liner retainers, and AV 1499 valve tool. Tappet-shim adjustment uses AS 9560/AS 9560A tools and the CS 7148 measuring fixture.

The liner chapter warns that grinding removes the Nikasil running-surface coating. It also requires pistons and liners to remain matched by their color classification.

Separate lubrication, crankcase-emission, and cooling sections explain circuit operation, oil-pump inspection, radiator removal, cooling-system filling and bleeding, water-pump checks, and thermostat testing.

Clutch Configurations and Differential Setup

Both AP Racing dry twin-plate and Valeo dry single-plate clutches are documented, with different flywheel mounting arrangements. The Voith flywheel and vibration damper form a balanced assembly; separating them disturbs that balance.

Beyond gearbox disassembly, the transaxle chapter details synchronizer clearance and axial-load checks, bevel-drive contact, pinion and differential bearing preload, and shaft assembly.

Wheel Bearings, Ride Height, and Steering Limits

Conventional and third-generation wheel-bearing arrangements have separate replacement procedures. Suspension checks address arm bushings, Hyperblocks, stabilizers, ball joints, and spring condition.

Height adjustment: The adjustable spring-seat washer accommodates spring load categories and ride height. The dampers’ damping characteristics are not adjustable.

The steering chapter provides rack-and-pinion specifications and maintenance information, not a full steering-rack overhaul.

Motronic, ABS, and Climate-Control Diagnosis

The PDF bookmarks identify the M2.5 section as 1989–1993 and the M2.7 insert as 1994. The M2.7 sheet includes connector-terminal tests, sensor characteristic curves, actuator signals, and its associated wiring schematic.

Separate diagnostic sheets: The M2.5 text refers to Diagnosis Sheets Nos. 10 and 11, and the ABS interconnector section refers to Sheet No. 7. Those separate sheets are not included in this PDF; the M2.7 Sheet No. 13 is included.

The ABS chapter distinguishes ECUs 131325 and 148838 and hydraulic units 139234 and 148839, an important detail when selecting repair information or replacement parts. Its failure-code table links reported faults to component and wiring checks.

Ferrari Tester climate-control coverage includes stored faults, guided diagnosis, live parameters, data capture, on-board checks, and active tests of flap motors, heater valve, blower, compressor clutch, and heater-water pump.

Electrical schematics cover the alternator and starter, M2.5 with and without catalysts, lighting and accessories, windows and door locks, climate and engine cooling, and ABS. Other illustrations include transverse and longitudinal engine sections, the timing-gear diagram, lubrication layout, and Teves hydraulic layout.

The Teves hydraulic unit must be depressurized before its circuit is opened. Brake and refrigerant service require the specified equipment and trained handling.

A Preview of Engine Clearances and Oil-Pressure Data

The liner-fitting section specifies 0.03–0.08 mm protrusion above the crankcase, with matching protrusion across each cylinder bank. Crankshaft inspection gives 0.100–0.289 mm end float alongside bearing and thrust-washer checks.

Lubrication specifications give a normal oil-pressure range of 5.5–6.5 bar at 6,000 rpm with the oil at 100°C, keeping the operating conditions attached to the pressure reading.