Info Uvv
E Throttle valve switch full throttle 2 to ground near relay board 3 to radiator fan relay 87 4 to relay board terminal H 30 5 to radiator fan relay 30 6 to fuel pump relay 16 r.p.m. signal 8 to fuel pumps, control pressure regulator, The frequency valve A is located below the throttle housing. Both micro-switches B are mounted on the bottom of the throttle housing. The oxygen sensor is threaded into the exhaust manifold on the right side of the engine. The oxygen sensor control unit is located...
Pistons
The pistons nominal dia 86.5 mm are provided with a combustion chamber approx. 17 mm deep compression ratio e 7.5 1 . The installation position is identified by an arrow punched into piston crown pointing toward V-belt pulley . The piston pin bore is offset from center by 1.5 mm. The cylinder bores and piston dias are subdivided into 3 tolerance groups. Tolerance Group Cylinder Bore Piston Dia 0.007 Groove I rectangular compression ring 86.5 x 79.3 x 1.5 Groove 11 baffle-taper compression ring...
Filling Capacities
Manual transmission and differential Total oil capacity 5.5 liters 5.8 qts Oil change with filter 5 liters 5.3 qts Difference between min. and max. on oil dipstick approx. 1.2 liters 1.3 qts Use HD oil labled for API classification SE Viscosity 20 w 50 not below -15 C 5 F 15 w 50 10 w 40 approx. 8 liters 8.5 qts coolant factory fill safe to 25 C. approx. 2.5 liters 2.6 qts Hypoid gear oil SAE 80 W 90 or SAE 90 of API classification GL 5 or MIL-L 2105 B . Windshield washer and headlight cleaner...
Info Eqm
11 Oil pressure sending unit The oil filter is located on a flange mounted to the engine which also houses the thermostat for the oil cooler. The thermostat opens at a temperature of 87 C. The pressurized oil for lubricating the turbo-charger branches off at the oil filter flange and flows through a separate line to the bearings of the turbocharger. The return oil flows directly back to the oil pan by gravity. The oil cooler is mounted directly behind the air ducts in the front spoiler....
Turbocharger System
Idle The engine draws-in fresh air through air filter 1 . The air flows across the sensor plate of mixture control unit 2 into intake duct 3 and to compressor 4 of the turbocharger. From here, the intake air is fed to the engine by way of a pressure duct 6 through the throttle valve housing 7 . The exhaust gases are routed through exhaust manifold 10 to turbine 11 of the turbocharger and from there through the catalytic converter and muffler. At idle there is no pressurization of the intake...
Turbocharger
The exhaust gas turbocharger is mounted at the right side of the engine under the exhaust manifold. In contrast to the 930, the pop-off valve 8 on the 924 is located directly in the compressor housing between the inlet and outlet. 1 Compressor housing inlet side 7 Compressor housing outlet side The safety switch is located in the pressure duct between the turbocharger and throttle valve housing. When the boost pressure increases to a value of 1.1 - 1.4 bar, the safety switch will switch the two...
Cylinder Head Tightening Specifications
When new 1. Lubricate threads of cylinder head bolts, tighten in steps to 40, 80, 110 Nm. 29.5,59,81 ft . lbs. 2. Retighten bolts after 1 hour engine stopped . Loosen the bolts 1 4 turn and retighten to 110 Nm 81 ft . lbs. . 3. Retighten bolts after test drive, with engine cooled down, as described under 2. Tightening sequence corresponding to numbers on illustration. No retorquing of cylinder heads later is required. The lubrication system of the 924 turbo engine includes the following new...
Ignition System
The 924 turbo engine has a breakeriess transistorized ignition system. There are two resistor wires leading to the coil. The wire between terminal 15 on the ignition control unit and terminal 15 on ignition coil has a resistance of 1.0 2. The wire between terminal 16 on the starter and terminal 15 on ignition coil has a resistance of 1.5 i2. Note Do not make these wires shorter during repairs.
Control Pressure Regulator Operation
With the engine stopped, or running with less than 0.1 bar boost, both springs operate against the control valve. The control pressure is high. Control pressure will drop full load enrichment when boost pressure at the top of the diaphragm exceeds 0.1 bar. The operation test for full load enrichment can be made only when the boost pressure is above 0.3 bar. Electric Control of Fuel Pumps Ignition System The 924 mixture control unit does not have an air sensor contact. The operation of the pump...