Volvo B234F Specifications
| Engine Model: Volvo B234F |
| Engine Type: 4-cycle inline 4-cylinder DOHC 16-valve liquid-cooled gasoline |
| Total Displacement: 141.3 cu.in (2.32 L) |
| Rated Engine Power: 152 Hp (112 kW) at 5800 rpm |
| Fuel System Type: Bosch LH-Jetronic 3.2 multipoint fuel injection |
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The Volvo B234F is a 2.3-liter, four-cylinder,
naturally aspirated gasoline engine, belonging to the final evolution of
Volvo's "red block" engine family. This engine represents a significant
technical departure by incorporating a 16-valve, dual overhead camshaft
(DOHC) cylinder head mounted on the classic, robust B230 series
cast-iron block. Developed in the early 1990s for the 940 series, the
B234F combines the proven durability and torque characteristics of the
red block bottom end with the improved breathing and efficiency of a
multi-valve design. It utilizes Bosch LH-Jetronic 3.2 electronic fuel
injection and a cross-flow aluminum cylinder head.
The engine delivers smooth, linear power with a higher revving character
than its 8-valve counterparts, offering improved specific output and
refinement. The B234F maintains the legendary strength and
serviceability of the red block lineage while introducing modern
valvetrain complexity. It stands as a unique and sought-after variant,
bridging the gap between traditional Volvo engineering and contemporary
engine design, prized for its balance of performance potential and
inherent toughness.
Engine Type: Inline-4 cylinder, longitudinal-mounted, liquid-cooled,
naturally aspirated, gasoline multi-point fuel injection (MPFI).
Displacement: 2316 cc (2.316 L) / 141.3 cu.in.
Bore x Stroke: 96.0 mm x 80.0 mm / 3.780 in x 3.150 in.
Compression Ratio: 10.5:1. Firing Order: 1-3-4-2.
Direction of Rotation: Clockwise (viewed from the front/flywheel end).
Maximum Power Output: 112 kW (152 hp) at 5800 rpm.
Maximum Torque Output: 206 Nm (152 lb-ft) at 4300 rpm.
Fuel Requirement: Premium unleaded gasoline, 95 RON (91 AKI) minimum.
Emission Standards Compliance: Euro 1 / US OBD I standards of the early
1990s.
Material: Cast iron. This is the standard, high-strength B230 series red
block, providing an immensely durable foundation.
Construction: Deep-skirt design with five main bearing supports. The
block features the characteristic substantial internal webbing of the
red block family. Main bearing caps are secured with vertical bolts.
Crankshaft: Forged steel crankshaft with eight counterweights. Main
bearing journal diameter: 64.0 mm / 2.520 in. Crankpin journal diameter:
54.0 mm / 2.126 in.
Pistons: Aluminum alloy pistons with a specific domed crown designed for
the 10.5:1 compression ratio and the 16-valve combustion chamber shape.
Connecting Rods: Forged steel I-beam connecting rods.
Material: Aluminum alloy. This is a significant change from the
cast-iron heads used on 8-valve red blocks. Head Construction: Dual
overhead camshafts (DOHC), 16-valve design (4 valves per cylinder). The
camshafts are driven by a single, reinforced timing belt.
Valve Arrangement: Valves are arranged in a cross-flow, pent-roof
combustion chamber. They are actuated via bucket tappets with shims for
manual valve clearance adjustment. This is an interference engine.
Variable Valve Timing: None.
Valve Diameters: Intake: 31.0 mm / 1.220 in. Exhaust: 27.5 mm / 1.083
in.
Injection Type: Bosch LH-Jetronic 3.2 multipoint fuel injection (MPFI).
This is an electronic, speed-density system using a manifold absolute
pressure (MAP) sensor.
Engine Management: Bosch ECU (EZK 162/163 ignition system integrated
with LH fuel control).
Fuel Delivery: An electric in-tank fuel pump supplies pressure to the
fuel rail.
Fuel Rail and Injectors: Four electronic fuel injectors.
Throttle Body: Single-bore, cable-operated throttle body.
Air Intake: Naturally aspirated via an air filter, air mass meter, and a
cast aluminum intake manifold.
Type: Pressure-fed, full-flow filtration with a gear-type oil pump.
Oil Pump: Gear-type pump, driven by the crankshaft via a short shaft and
gear.
Oil Filter: Full-flow, spin-on canister type.
Oil Cooler: Not standard equipment on this naturally aspirated variant.
Oil Capacity (including filter): 5.0 L / 5.3 US qt.
Recommended Oil Grade: High-quality semi-synthetic or full synthetic
engine oil meeting API SG/SH or later. Viscosity: 10W-40 or 15W-40.
Operating Oil Pressure: 2.0 bar at hot idle, 3.5 - 4.5 bar at 2000 rpm.
Imperial: 29 psi (idle), 51 - 65 psi (2000 rpm).
Type: Pressurized, single-circuit system with a separate expansion tank.
Water Pump: Centrifugal pump, driven by the timing belt.
Thermostat: Wax pellet type, opening temperature 88°C (190°F).
Coolant Capacity: 8.5 L / 9.0 US qt (entire system).
Coolant Type: Ethylene glycol-based antifreeze.
Electrical System: 12-volt negative ground.
Ignition System: Bosch EZK 162/163 electronic distributor-based
ignition, integrated with the fuel injection ECU.
Engine Management: Combined Bosch LH-Jetronic 3.2 (fuel) and EZK 162/163
(ignition) systems.
Crankcase Ventilation: Closed Positive Crankcase Ventilation (PCV)
system with an oil separator.
Exhaust System: A 4-into-2-into-1 exhaust manifold is used to optimize
exhaust gas flow for the 16-valve head.
Overall Length: 630 mm / 24.8 in.
Overall Width: 660 mm / 26.0 in.
Overall Height: 700 mm / 27.6 in.
Dry Weight: 160 kg / 353 lbs.
Engine Oil Change Interval: Every 10,000 km or 12 months. Severe service
intervals are 5,000 km or 6 months. Imperial: 6,200 miles / 3,100 miles.
Oil Filter Change: Every oil change. Fuel Filter Change: Every 30,000 km
(18,600 miles). Air Filter Change: Every 30,000 km or as inspected.
Timing Belt Replacement: This is an interference engine. Replace the
timing belt, tensioner, and idler rollers every 80,000 km (50,000 miles)
or 5 years without exception. The water pump must be replaced
concurrently.
Valve Clearance Adjustment: Required. Check and adjust (via replacement
of shims under bucket tappets) every 40,000 km (25,000 miles). Clearance
(cold): Intake: 0.15-0.25 mm (0.006-0.010 in). Exhaust: 0.30-0.40 mm
(0.012-0.016 in). Spark Plug Replacement: Specified copper-core or
platinum spark plugs require replacement every 15,000-30,000 km
(9,300-18,600 miles). Coolant Replacement: Every 2 years. Belt Service:
Inspect and replace the accessory drive V-belt(s) every 50,000 km
(31,000 miles).
Cylinder Head Bolts: Torque-to-yield (TTY) bolts. Tighten in the
specified sequence: Step 1: 40 Nm (30 lb-ft). Step 2: +90° turn. Step 3:
Final +90° turn. Bolts are single-use.
Main Bearing Cap Bolts: 110 Nm (81 lb-ft).
Connecting Rod Cap Bolts: 55 Nm (41 lb-ft).
Spark Plugs: 30 Nm (22 lb-ft).
Oil Drain Plug: 45 Nm (33 lb-ft).
Camshaft Sprocket Bolts: 90 Nm (66 lb-ft).
Flywheel to Crankshaft Bolts: 110 Nm (81 lb-ft).
Wheel Bolts: 110 Nm (81 lb-ft).
The Volvo B234F 16-valve engine had a limited production run and was
used in specific Volvo models in the early 1990s. Volvo 940 (1991-1992):
940 SE 16V, 940 GLE 16V. This was the primary and most common
application. Volvo 740 (1990-1991): A very limited number of
late-production 740 GLE 16V models in select markets.
This engine was never officially sold in the North American market. Its
production was primarily for European markets where its higher specific
output and technology were competitive. It is a rare and desirable
variant among Volvo red block enthusiasts.
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