Complete Engine (Coupe): Diagnosis Smart Fortwo II

Inspect cylinders with a light probe - AR01.00-P-0200MCU

ENGINE 132.910 in MODEL 451.3 /4

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Remove/install Risk of death caused by vehicle slipping or toppling off the lifting platform. Align vehicle between columns of vehicle lift and position four support plates at vehicle lift support points specified by vehicle manufacturer. AS00.00-Z-0010-01A 1 Lift vehicle using the vehicle lift until the rear wheels can be turned freely 2 Remove expansion clips (1) and remove cover (2) 3 Remove spark plugs (R4) Replace spark plugs AP15.10-P-1580MCU 4 Lead a suitable hose through the spark plug threaded hole in the respective cylinder and turn engine at the center bolt (3) of the crankshaft belt pulley (4) in the direction of engine rotation until the piston stands at the bottom dead center of the cylinder to be checked 5 Attach inspection light to endoscope and lead inspection light through the spark plug threaded hole in the cylinder to be checked Endoscope (cold light) Checking 6 Check cylinder wall, piston crown and valves In the case of visible cylinder wear the cylinder barrel is roughened and the honing marks are no longer visible. The cylinder head must be removed in cases of doubt. Refer to: ↓ Remove/install cylinder head AR01.30-P-5800MCU Notes for evaluation of a cylinder barrel AH01.40-P-0001-03SM 7 Inspect other cylinders in the same way 8 Install in the reverse order

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Test compression pressure - AR01.00-P-1200MCU

ENGINE 132.910 in MODEL 451.3 /4

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Remove/install Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns during starting procedure or when working near the engine as it is running Secure vehicle to prevent it from moving by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts. AS00.00-Z-0005-01A 1 Bring engine to its operating temperature of about 144°C and switch off ignition Only test compression pressure when engine is at normal operating temperature. 2 Remove spark plugs Replace spark plugs AP15.10-P-1580MCU Checking 3 Route electrical line (2) for compression recorder (1) between air filter housing (3) and throttle valve actuator (M16/6) to the starter (M1) see scheme 12 Risk of death caused by vehicle slipping or toppling off the lifting platform. Align vehicle between columns of vehicle lift and position four support plates at vehicle lift support points specified by vehicle manufacturer. AS00.00-Z-0010-01A 4 Raise vehicle with vehicle lift 5 Detach connector (4) from starter (M1) 6 Attach clamping device (5, 6) to starter (M1) see scheme 12 7 Lower vehicle with lifting platform 8 Allow engine to turn using contact switch on compression recorder (1) for about 5 seconds In order to remove combustion residues from the cylinders. see scheme 12 9 Insert compression recorder (1) with appropriate connecting piece into spark plug bore see scheme 12 10 Crank engine with contact switch at the compression recorder (1) until an increase in pressure is no longer indicated on the compression recorder (1) see scheme 12 11 Carry out test procedure at remaining cylinders in the same way 12 Compare measurements obtained with the specified pressures Compression pressure new value *BE01.00-P-1001-01G Compression pressure wear limit or limit value If the wear limit is not reached, cylinder leakage must be checked on the respective cylinder. See: ↓ *BE01.00-P-1002-01G Inspect cylinders for leaks AR01.00-P-1300MCU 13 Install in the reverse order 14 Read out fault memory, erase if necessary Connect STAR DIAGNOSIS and read out fault memory AD00.00-P-2000-04MCC

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CHECK VALUES FOR COMPRESSION PRESSURE

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Inspect cylinders for leaks - AR01.00-P-1300MCU

ENGINE 132.910 in MODEL 451.3 /4

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Remove/install Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns during starting procedure or when working near the engine as it is running Secure vehicle to prevent it from moving by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts. AS00.00-Z-0005-01A 1 Warm up engine to operating temperature of approximately 144°C 2 Remove right rear wheel AR40.10-P-1100MCU 3 Remove expansion clips (1) and remove cover (2) 4 Lower vehicle with lifting platform 5 Remove maintenance flap Risk of injury to skin and eyes caused by scalding from contact with hot coolant spray. Risk of poisoning caused by swallowing coolant. Do not open cooling system unless coolant temperature is below 90°C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers. Wear protective gloves, protective clothing and safety glasses. AS20.00-Z-0001-01A 6 Turn cooling system cap on radiator counterclockwise through half a revolution, release overpressure, then unscrew cap on cooling system expansion reservoir 7 Remove spark plugs (R4) Replace spark plugs AP15.10-P-1580MCU 8 Unscrew cap on oil filler neck Check 9 Screw adapter into spark plug bore on cylinder 1 and connect up top dead center finder Insert for cylinder 1 and 2 of adapter from the left. Insert for cylinder 3 of adapter from the right. see scheme 15 (Scheme 4) 10 Raise vehicle with vehicle lift 11 Turn engine in direction of engine rotation at the center bolt (4) of the crankshaft belt pulley (3) and set piston on cylinder 1 with the aid of the top dead center locator to ignition TDC Turn combustion engine until the ball in the inspection glass on the top dead center locator falls suddenly. (Scheme 4) 12 Lower vehicle with lifting platform 13 Apply hand brake and select gear 14 Disconnect top dead center locator on adapter see scheme 15 (Scheme 4) 15 Connect compressed air hose to pressure loss tester (Scheme 4) 16 Attach pressure loss tester to adapter Calibrate pressure loss tester. Observe operating instructions for the pressure loss tester. see scheme 15 (Scheme 4) 17 Pressurize cylinder 1 with compressed air and read off the pressure loss on pressure loss tester If there is increased pressure loss determine the cause. Cylinder leaktightness: permissible loss total indication *BE01.00-P-1001-02Z (Scheme 4) 18 Place transmission in neutral and release hand brake 19 Inspect other cylinders in the same way 20 Install in the reverse order

CYLINDER LEAKAGE

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1. Disconnect electrical connector (2) on adjustable camshaft timing solenoid (Y49)
2. Unclip retaining clamps (3) for engine wiring harness (1) from brackets on cylinder head cover (4).
3. Disconnect connector for O2 sensor upstream of TWC (G3/2x1) and unclip on bracket (5).
4. Remove bolts (6) and lay holder (5) to the side together with engine wiring harness (1).
5. Connect in reverse order.

Testing and repair work: Smart: Complete engine, crankcase ventilation, cylinder head, crankcase - AR01.00-Z-9132CB

ENGINE 132

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1. Remove expansion clips (1) and remove cover (2)
2. Transfer marking (arrow A) on crankshaft belt pulley (3) to the front side using a suitable colored pencil. If necessary turn engine at the center bolt (4) of the crankshaft belt pulley (3) in the direction of engine rotation.
3. Rotate engine at crankshaft in direction of engine rotation until marking (arrow A) on crankshaft belt pulley (3) coincides with the TDC marking (arrow B) on the timing case cover (5).
4. Position cover (2) and install expansion clip (1) If no further turning of engine is required.

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Attaching

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1. Position main assembly lifting table with universal main assembly mount (1) under engine and transmission. Main assembly lifting table and universal main assembly mount
2. Fasten mount (2) on timing case cover (3).
3. Position mounting plate (4) under the oil pan position mounting plate (5) under the transmission. Then adjust height of the mount (2) and mounting plates (4, 5) appropriately. Remove
4. Lower main assembly lifting table with universal main assembly mount (1) and pull to the front under the vehicle.
5. Remove mount (2) from timing case cover (3).