Contents: Lubrication system ⇩ Crankcase ventilation ⇩ Cylinder block components ⇩ Cylinder head components ⇩ Timing belt ⇩
The MPi engine is a four-cylinder, water-cooled engine with an aluminum alloy head and block and two overhead camshafts. Belongs to the "T" series of engines.
The crankshaft has full support, the thrust bearing is located on the middle main journal. The main bearing caps are installed using pins.
The valves are driven by hydraulic tappets, the camshafts are driven by a belt from the crankshaft. The timing belt covers are plastic and are secured with bolts.
The pistons are made of aluminum alloy with two compression rings and one oil scraper ring. The floating piston pin is located eccentrically to the piston axis.
The trachoidal type oil pump is installed at the front of the engine.
Lubrication system
Oil from the sump is drawn in by the pump (2) through the intake manifold (1). The pressure in the main oil line is maintained at a predetermined level by a pressure-reducing valve (3) built into the pump. The oil pressure sensor (4) is installed in the oil filter housing (5). Oil is supplied to the connecting rod bearings from main bearings 1, 3, and 5 of the journals (6). Oil is supplied to the cylinder head through the jet (7), where it lubricates the tappets and camshaft bearings (8). The piston pins and cylinder walls are lubricated by splash lubrication.
Crankcase ventilation
The crankcase ventilation is closed, via two hoses connected to the intake manifold and throttle body. An oil catch can is installed in the valve cover.
Cylinder block components
1 - cylinder block, 2 - knock sensor, 3 - crankshaft position sensor, 4 - sensor mounting bolt, 5 - cylinder head guide pin, 6 - connecting rod bolt, 7 - piston, 8 - upper compression ring, 9 - lower compression ring, 10 - oil scraper ring, 11 - gearbox adapter, 12 - upper connecting rod bearing, 13 - flywheel, 14 - flywheel bolt, 15 - adapter bolt, 16 - plug, 17 - plug bolt, 18 - gasket, 19 - rear oil seal housing bolt, 20 - rear oil seal and housing, 21 - water pump cover bolt, 22 - water pump cover, 23 - water pump, 24 - sealing rings, 25 - sealing ring, 26 - water pump bolt, 27 - sealing ring, 28 - water pump housing, 29 - upper half ring of thrust bearing, 30 - upper main bearing shell, 31 - oil pan guide pin, 32 - flywheel guide pin, 33 - piston pin, 34 - crankshaft, 35 - lower connecting rod bearing shell, 36 - connecting rod cap, 37 - connecting rod cap fastening nut, 38 - main bearing cap guide pin, 39 - main bearing cap, 40 - main bearing cap bolt, 41 - lower half ring of thrust bearing, 42 - lower main bearing shell, 43 - key, 44 - oil dipstick, 45 - oil dipstick tubes, 46 - oil dipstick tube, 47 - bolts sump, 48 - sump gasket, 49 - sealing ring, 50 - oil pickup, 51 - oil pickup bolt, 52 - sump, 53 - drain plug washer, 54 - drain plug, 55 - oil filter, 56 - front crankshaft oil seal, 57 - oil pump bolt, 58 - gasket, 59 - oil pump, 60 - oil pressure sensor, 61 - gearbox input shaft bushing, 62 - gearbox input shaft bearing, 63 - water pump guide pin, 64 - connecting rod, 65 - timing belt tensioner plate bolts, 66 - timing belt tensioner plate, 67 - gearbox adapter bolt.
Cylinder head components
1 - oil filler cap, 2 - seal, 3 - spark plug cover screw, 4 - spark plug cover, 5 - high-voltage wire clip, 6 - clip screw, 7 - valve cover (intake), 8 - valve cover (exhaust), 9 - bolt, 10 - cover gasket, 11 - camshaft bed bolt (exhaust), 12 - camshaft bed (exhaust), 14 - exhaust camshaft, 15 - plug, 16 - plug bolt, 17 - camshaft bed guide pin, 18 - coolant jacket outlet pipe, 19 - gasket, 20 - pipe bolt, 21 - exhaust manifold stud, 22 - cylinder head gasket, 23 - exhaust valve guide, 24 - exhaust valve seat, 25 - exhaust valve, 26 - intake valve, 27 - intake valve seat, 28 - intake valve guide, 29 - cylinder head, 30 - intake manifold stud, 31 - valve stem seal, 32 - valve spring, 33 - spring plate, 34 - crackers, 35 - tappet, 36 - camshaft oil seals, 37 - toothed wheel guide pin, 38 - intake camshaft, 39 - camshaft bed (intake), 40 - camshaft bed bolt (intake), 41 - gasket, 42 - valve cover bolt (intake), 43 - spark plug, 44 - coolant temperature sensor.
Note: On some engines pos. 15,16 and 36 can be replaced with plugs, see below.
Timing belt
1 - Upper belt cover bolt, 2 - Upper belt cover, 3 - Camshaft toothed wheel bolt, 4 - Washer, 5 - Timing belt, 6 - Intake camshaft toothed wheel, 7 - Exhaust camshaft toothed wheel, 8 - Rear upper belt cover bolt, 9 - Rear upper belt cover, 10 - Rear lower belt cover, 11 - Tensioner spring housing, 12 - Axle bolt, 13 - Tensioner spring, 14 - Tensioner roller, 15 - Tensioner lock bolt, 16 - Crankshaft toothed wheel, 17 - Lower belt cover, 18 - Lower belt cover bolt, 19 - Center belt cover, 20 - Crankshaft pulley, 21 - Pulley bolt, 22 - Crankshaft center bolt.
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