Tune-Up - 4-cyl Volvo 760 I

ENGINE IDENTIFICATION

Engine is identified by sixth and seventh character of Vehicle Identification Number (VIN). The VIN is a 17 character stamped plate, attached to upper left side of instrument panel and is visible through windshield.

ENGINE CODE

ENGINE COMPRESSION

Warm engine to normal operating temperature. Disconnect single wire from negative terminal of ignition coil. Check compression with all spark plugs removed, throttle valve wide open and at normal cranking speed (250-300 RPM). Maximum variation between cylinders must not exceed 28 psi (2 kg/cm 2 ).

Note. On vehicles with LH-Jetronic injection, failure to disconnect ignition coil negative terminal may cause damage to ignition system control unit(s).

COMPRESSION SPECIFICATIONS

VALVE CLEARANCE

1. Remove valve cover. Turn crankshaft center bolt until camshaft is in position for firing No. 1 cylinder (TDC). Both cam lobes should point up at equally large angles. Pulley timing mark should be at zero degree mark.
2. Using a feeler gauge, check valve clearance of No. 1 cylinder between camshaft lobe and adjusting discs. Intake and exhaust valves have same clearance.
3. If clearances are incorrect, adjust by changing thickness of disc(s). Discs are available in .002" (.05 mm) increments. Install disc with markings facing down. Use Valve Depressor (5022) and Pliers (5026) to depress and remove disc(s).
4. After valves for No. 1 cylinder are properly adjusted, rotate crankshaft to firing position for No. 3, No. 4, and No. 2 cylinders in sequence and repeat procedure. Install valve cover.

VALVE CLEARANCE SPECIFICATIONS

VALVE ARRANGEMENT

1. E-I-E-I-E-I-E-I (Front-to-rear).

Firing Order & Distributor Rotation (200 Series). Scheme 5

Firing Order & Distributor Rotation (700 Series). Scheme 6

IGNITION TIMING

Timing is preset and programmed in ECU (Electronic Control Unit) and cannot be adjusted.

IGNITION TIMING (DEGREES BTDC @ RPM)

IDLE SPEED & MIXTURE

Note. The engine is equipped with CIS (Constant Idle Speed) integrated with the LH-Jetronic 2.2 system. Basic idle speed is factory preset to about 750 RPM. Adjustment under normal conditions is not necessary.

Idle Speed

1. Warm engine to normal operating temperature. Turn A/C off (if equipped). On 740 and 760 models ground Red/White wire of test point connector located at right front wheel housing. (Scheme 7) On 240 models ground Blue/White wire of test point connector located by air flow meter. This will close air valve completely.
2. Turn idle adjustment knob/screw to set idle speed to 700 RPM. Disconnect Red/White wire. Idle speed should increase to 730-770 RPM. Turn A/C on (if equipped). Idle speed should increase to 900 RPM.

Scheme 7

Note. Mixture adjustment is NOT a normal tune-up procedure and should not be performed unless mixture control unit is replaced or vehicle fails emissions testing.

Idle Mixture

1. Warm engine to normal operating temperature. Check idle speed and ignition timing. Disconnect oxygen sensor. Check CO level.
2. If CO level is incorrect, turn off engine. Drill two 5/16" holes in adjustment plug. Pull out plug with snap ring pliers. Start engine and adjust CO level. (Scheme 8)
3. Turning screw counterclockwise decreases CO level. Turning screw clockwise increases level. Connect oxygen sensor lead and remove test equipment. Seal CO adjustment screw with a new plug.

Scheme 8

CO LEVEL SPECIFICATIONS

Distributor

All models are equipped with Bosch EZ-117K ignition system. No adjustments are required.

EMISSION CONTROL

See EMISSIONS section.

OXYGEN SENSOR REPLACEMENT

Disconnect oxygen sensor lead and remove oxygen sensor. Coat new oxygen sensor threads with anti-seize compound. DO NOT apply anti-seize compound to slotted part of oxygen sensor. Tighten oxygen sensor to 36-44 ft. lbs. (50-60 N.m). Connect oxygen sensor lead.

Fuel Injection

All models are equipped with Bosch LH-Jetronic 2.2 fuel injection with integrated Constant Idle Speed.

Fuel Pump

Check fuel pump with full battery charge and clean fuel filter.

FUEL PUMP PERFORMANCE

BATTERY

BATTERY SPECIFICATIONS

STARTER

All models are equipped with Bosch overrunning clutch starters.

STARTER SPECIFICATIONS

ALTERNATOR

All models are equipped with Bosch alternators with integral voltage regulators.

ALTERNATOR SPECIFICATIONS

ALTERNATOR REGULATOR

All models are equipped with Bosch alternator regulators.

REGULATOR OPERATING VOLTAGE @ 68°F (20°C)

SERVICE INTERVALS

REPLACEMENT INTERVALS

BELT ADJUSTMENT

BELT ADJUSTMENT

CAPACITIES

FLUID CAPACITIES

SPARK PLUGS

SPARK PLUG TYPE

SPARK PLUG SPECIFICATIONS