Volkswagen BMT Specifications
| Engine Model: Volkswagen BMT |
| Engine Type: 4-cycle 4-cylinder SOHC 8-valve turbocharged liquid-cooled diesel |
| Total Displacement: 120.1 cu.in (1.96 L) |
| Rated Engine Power: 138 Hp (103 kW) at 4000 rpm |
| Fuel System Type: Bosch unit injectors |
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The Volkswagen BMT is a 2.0-liter, inline 4-cylinder
turbocharged diesel engine from the EA188 family, produced between 2006 and
2010. Engineered for the Volkswagen Sharan and SEAT Alhambra multi-purpose
vehicles (MPVs), the BMT represents the final evolution of the Pump-Duse (PD)
unit injector architecture before the transition to common rail systems. Unlike
the 16-valve variants of the 2.0 TDI, the BMT retains a single overhead camshaft
(SOHC) with two valves per cylinder - an 8-valve configuration derived from the
robust 1.9 TDI lineage.
This design choice prioritized mechanical durability and low-end torque
production over high-rpm power, characteristics well-suited to the weight and
duty cycle of large MPVs. With a displacement of 1,968 cc derived from a bore
and stroke of 81.0 mm x 95.5 mm, the undersquare engine delivers 140 PS and 310
Nm of torque, with the peak torque plateau beginning at 1,900 rpm. The BMT
employs Bosch unit injectors (Pump-Duse) actuated directly by the camshaft,
achieving injection pressures up to 2,000 bar without the need for a separate
high-pressure fuel pump.
Equipped with a variable-geometry turbocharger (VGT) and a diesel particulate
filter (DPF) for Euro 4 compliance, the engine balances robust power delivery
with emission control. The BMT is distinguished by its 8-valve cylinder head,
which avoids the cylinder head cracking issues associated with certain 16-valve
EA188 variants, while sharing the known service considerations of the 2.0 PD
family, including the hexagonal oil pump drive shaft and the importance of VW
507.00 oil for camshaft and DPF longevity.
Engine Code: BMT
Engine Family: Volkswagen EA188 (Pump-Duse / Unit Injector)
Configuration: Inline 4-cylinder
Valvetrain: SOHC, 8 valves (2 per cylinder), belt-driven
Displacement: 1968 cc (120.1 cu.in)
Bore: 81.0 mm (3.19 in)
Stroke: 95.5 mm (3.76 in)
Compression Ratio: 18.5:1
Firing Order: 1-3-4-2
Fuel System: Bosch Unit Injectors (Pump-Duse / PD)
Fuel Injection Pressure: Up to 2000 bar (29,000 psi)
Aspiration: Turbocharged and air-to-air intercooler
Maximum Power: 103 kW (138 hp) at 4000 rpm
Maximum Torque: 310 Nm (229 lb-ft) at 1900 rpm
Maximum Engine Speed: 4800 rpm (fuel cut-off)
Emission Standard: Euro 4 with Diesel Particulate Filter (DPF)
The cylinder block is constructed from cast iron,
providing the structural rigidity required for the high mechanical loads
generated by unit injector combustion pressures. The block is a deep-skirt,
closed-deck design, with the cylinder bores machined directly into the cast iron
without removable liners. This configuration maximizes bore rigidity under peak
cylinder pressures exceeding 160 bar.
The crankshaft is manufactured from forged steel and is supported by five main
bearings, with bearing cap reinforcements integrated into the lower crankcase
structure. The connecting rods are forged steel with fracture-split caps,
ensuring precise bearing bore geometry and consistent clamping force. The
pistons are aluminum alloy with a reinforced top ring land and a deep combustion
bowl optimized for the unit injector’s high-pressure fuel delivery.
Piston cooling jets are integrated into the cylinder block, directing a
continuous spray of engine oil to the underside of each piston crown to manage
thermal loads under sustained high-load operation. The oil pump drive system
employs a hexagonal drive shaft (hex pole) connecting the balance shaft module
to the oil pump; this component is a known service consideration, as wear can
lead to oil pressure loss.
The cylinder head is manufactured from aluminum alloy
and houses a single overhead camshaft (SOHC) operating two valves per cylinder -
one intake and one exhaust. This 8-valve configuration is derived from the 1.9
TDI lineage and is recognized for its robustness relative to the 16-valve heads
used in other EA188 2.0 TDI variants. The camshaft is driven by a toothed timing
belt from the crankshaft sprocket, with a spring-loaded automatic tensioner
maintaining belt tension.
The valvetrain employs mechanical bucket tappets (solid lifters) that require
periodic valve clearance inspection and manual adjustment using select-fit
shims. The unit injectors (Pump-Duse) are integrated into the cylinder head,
with each injector actuated directly by a dedicated camshaft lobe. These lobes
are narrow and operate under high contact pressure; the use of VW 507.00 low-ash
oil is mandatory to prevent camshaft lobe and injector rocker arm wear.
The combustion chamber is a swirl-optimized design with the valves positioned to
generate intake swirl motion, enhancing air-fuel mixing in the direct injection
diesel combustion process. The cylinder head incorporates integrated exhaust gas
recirculation (EGR) passages and is drilled with dedicated cooling channels
around the valve seats and injector pockets.
The fuel system employs the Bosch Pump-Duse (PD) unit
injector architecture, a design that eliminates a separate high-pressure fuel
pump by integrating the pumping element within each injector. A mechanical
tandem pump - mounted to the cylinder head and driven by the camshaft - supplies
fuel at a baseline pressure to the unit injectors.
Each unit injector contains its own plunger and pumping mechanism, actuated by a
dedicated camshaft lobe that generates injection pressures up to 2000 bar
(29,000 psi) directly within the injector body. This configuration enables
precise injection timing control, with the Engine Control Module (ECM) governing
the solenoid valve on each injector to determine the start and duration of
injection.
The system supports multiple injection events per combustion cycle, including
pre-injection for combustion noise reduction and main injection for power
delivery. A fuel cooler is integrated into the system to stabilize fuel
temperature returning from the injector leak-off circuit. The system is
sensitive to fuel contamination; the fuel filter must be replaced at specified
intervals to protect the precision components within the unit injectors.
The lubrication system is a pressurized, full-flow
wet-sump design utilizing a rotor-type oil pump driven by the balance shaft
module via a hexagonal drive shaft. The hex shaft is a critical component; wear
to its hexagonal ends can result in reduced oil pump drive, leading to oil
pressure loss and catastrophic engine failure. The oil pump draws fluid from a
pressed-steel oil pan, with a total system capacity of 4.3 liters (4.5 qt)
including the filter. A cartridge-type oil filter is housed in a plastic filter
housing mounted to the cylinder block, with a replaceable filter element.
The recommended oil must meet VW 507.00 specification - a low-ash (Low-SAPS)
5W-30 or 0W-30 formulation designed to protect the diesel particulate filter
(DPF) and provide the necessary wear protection for the high-contact-pressure
camshaft and unit injector components. An oil-to-water cooler is integrated at
the oil filter housing, stabilizing oil temperature by transferring heat to the
engine coolant circuit. Piston cooling jets are integrated into the cylinder
block, providing continuous oil spray to the piston crowns.
The cooling system is a sealed, pressurized arrangement
with a belt-driven centrifugal water pump. The water pump is mounted to the
cylinder block and is driven by the same timing belt that actuates the camshaft,
requiring water pump replacement to coincide with timing belt service intervals
to prevent belt contamination from coolant leakage. Coolant circulates through
the cast iron cylinder block and aluminum cylinder head, with a wax-element
thermostat having an opening temperature of 87°C (189°F) regulating flow to the
front-mounted radiator.
A separate electric auxiliary water pump is incorporated to provide continued
coolant circulation to the turbocharger and EGR cooler after engine shut-down.
The total cooling system capacity is 7.5 liters (7.9 qt). A 1.4-bar (20.3 psi)
radiator cap maintains system pressure. The system utilizes an organic acid
technology (OAT) coolant formulation, VW G12++ or G13 specification, designed
for extended service intervals.
0The engine is equipped with a variable-geometry
turbocharger (VGT). The VGT mechanism alters the angle of the turbine vanes to
optimize exhaust gas flow across the turbine wheel. At low engine speeds, the
vanes close to increase exhaust velocity, rapidly building boost pressure and
torque. At higher speeds, the vanes open to reduce backpressure and maintain
efficiency. Boost pressure is managed by the ECM via a solenoid-actuated vacuum
control system. An air-to-air intercooler mounted at the front of the vehicle
reduces intake air temperature after compression.
Exhaust Aftertreatment: The exhaust system incorporates
a close-coupled diesel oxidation catalyst (DOC) and a diesel particulate filter
(DPF) housed in a single canister. The DOC oxidizes hydrocarbons and carbon
monoxide, while the DPF captures soot. Passive regeneration occurs during normal
high-load operation; active regeneration is initiated by the ECM, involving
post-injection of fuel to raise exhaust temperatures and burn off accumulated
soot. An exhaust gas recirculation (EGR) system with a cooled EGR circuit
reduces nitrogen oxide (NOx) emissions by recirculating a portion of exhaust gas
into the intake manifold. The BMT is sensitive to duty cycles; frequent
short-distance operation can lead to incomplete DPF regeneration and subsequent
DPF clogging.
Intake System: The intake system incorporates a composite plastic intake
manifold with integrated intake manifold flaps that create swirl flow in the
combustion chamber at low engine speeds, improving mixture formation. The flaps
are actuated by a vacuum-actuated diaphragm mechanism.
Engine Management: The Bosch EDC16 engine control unit is a 32-bit system
integrating fuel injection timing, variable-geometry turbocharger control,
exhaust gas recirculation, intake flap actuation, DPF regeneration management,
and on-board diagnostics. The system employs multiple pressure and temperature
sensors throughout the intake and exhaust tracts.
Overall Length: 660 mm (26.0 in).
Overall Width: 620 mm (24.4 in).
Overall Height: 680 mm (26.8 in).
Dry Weight (without ancillaries): 145 kg (320 lb).
Dry Weight (fully dressed with turbocharger, manifolds, and ancillaries): 170 kg
(375 lb).
Engine Oil Capacity (with filter change): 4.3 liters
(4.5 qt).
Engine Oil Specification: VW 507.00 (Low-SAPS 5W-30 or 0W-30).
Oil Change Interval: 15,000 km (9,300 miles) or 12 months.
Coolant Capacity: 7.5 liters (7.9 qt).
Coolant Specification: OAT (organic acid technology) coolant.
Coolant Change Interval: 80,000 km (50,000 miles) or 48 months.
Timing Belt Replacement Interval: 120,000 km (75,000 miles) or 60 months.
Timing Belt Tensioner: Automatic spring-loaded - replace with timing belt.
Water Pump Replacement Interval: Replace concurrently with timing belt.
Valve Clearance (cold, intake): 0.20-0.30 mm (0.0079-0.0118 in).
Valve Clearance (cold, exhaust): 0.40-0.50 mm (0.0157-0.0197 in).
Valve Clearance Adjustment Interval: Inspect every 60,000 km (37,500 miles).
Fuel Filter Replacement Interval: 30,000 km (18,750 miles) or 24 months.
Air Filter Replacement Interval: 45,000 km (28,000 miles) or as indicated by
restriction indicator.
Drive Belt (serpentine) Tension: Automatic spring tensioner - no adjustment
required.
Drive Belt Replacement Interval: 120,000 km (75,000 miles).
Cylinder Head Bolts: 40 Nm (30 lb-ft)
Main Bearing Cap Bolts: 50 Nm (37 lb-ft)
Connecting Rod Cap Bolts: 30 Nm (22 lb-ft)
Camshaft Cap Bolts: 20 Nm (15 lb-ft)
Camshaft Sprocket Bolt: 55 Nm (41 lb-ft)
Crankshaft Pulley Bolt: 150 Nm (111 lb-ft)
Flywheel / Flexplate Bolts: 60 Nm (44 lb-ft)
Intake Manifold Bolts: 23 Nm (17 lb-ft)
Exhaust Manifold Nuts: 25 Nm (18 lb-ft)
Turbocharger to Manifold Nuts: 40 Nm (30 lb-ft)
Unit Injector Clamp Bolts: 10 Nm (7 lb-ft)
Glow Plugs: 15 Nm (11 lb-ft)
Tandem Pump Mounting Bolts: 25 Nm (18 lb-ft)
Oil Pan Bolts: 12 Nm (9 lb-ft)
Water Pump Bolts: 12 Nm (9 lb-ft)
Oil Filter Housing (cartridge type): 25 Nm (18 lb-ft)
Engine Mount Brackets: 50 Nm (37 lb-ft)
Volkswagen Sharan (7M, 2006-2010): The BMT engine
served as the 2.0 TDI 140 PS powerplant for the first-generation Sharan MPV
during its final production years. In this application, the engine was paired
with either a 6-speed manual transmission or a 6-speed automatic transmission,
calibrated for the vehicle’s seven-seat configuration and towing capability. The
transverse engine mounting and compact dimensions suited the Sharan’s platform
architecture.
SEAT Alhambra (7V, 2006-2010): The Alhambra - the SEAT-branded counterpart to
the Volkswagen Sharan - received the BMT engine as the 2.0 TDI 140 PS option.
This application was marketed across European markets, with the engine
emphasizing low-end torque for urban driving and highway cruising. The Alhambra
shared the same transverse engine mounting, transmission options, and chassis
architecture as the Sharan, with model-specific ECU calibration for throttle
response and transmission shift mapping.
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