A) Carburettor engine: Disconnect flat erath cable from battery. Drain coolant. Note when fitting: Bleed coolant system cf. 17 00 039. Pull fuel hose (1) off fuel pump. Disconnect throttle linkage bars (2). Pull off cables 3 ÷ 6.  17 00 039
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Pull vacuum hose for brake servo off induction pipe. Remove support angle for dipstick (oil). |  |
Disconnect hoses 7 ÷ 10. |  |
Move piston in first cylinder to TDC. Distributor rotor must point at notch in distributor casing. Remove gearbox cover at top cf. 11 14 100. 11 14 100
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Open safety plates. Take out sprocket. |  |
Note when fitting: Fit on chain in such a way that dowel pin (1) is at bottom left. The bore in the sprocket must be flush with the thread bore and casting tab. |  |
Remove pipe clamp. Loosen triangular flanges on exhaust muffler. Disconnect exhaust pipes from exhaust manifolds. Note when fitting: Replace sealings. Coat stud bolts Molycote paste. |  |
Loosen cylinder head studs. Prevent rocker arm shafts from being displaced or distorted by fitting in guide pins. |  |
Take off cylinder head: Note when fitting:Tighten bolts in order 1 ÷ 14 in three subsequent stages. Let engine warm up to normal operating temperature. After a trial run, let engine cool again to 35º C (95º F). Tighten cylinder head studs one final time. After a distance of 1000 km (600 miles) has been covered, the cylinder head studs must be tightenend once again, and then at the normal service intervals. Note: There must not be only oil in the blind holes, as there is otherwise a risk that although the bolts are tightened at the torque specified they do not have sufficient pressure on the cylinder head. In addition, oil in the blind holes may cause the cylinder crankase to crack. Note when fitting: Always replace the cylinder head sealing. Adjustment of valve clearance cf. 11 34 004. Adjust engine idling speed and fuel/air mixture. 11 34 004
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B) Injection engine: Disconnect minus cable from battery. Drain coolant. Note when fitting: Bleeding of coolant system cf. 17 00 039. Loosen clamp on throttle butterfly manifold. Lift intake filter housing from support in so doing pull hose out of splashboard. Remove screenwasher reservoir. 17 11 039
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Disconnect loom from engine 61 12 021b ). Pull inductive switch (1) and cable (2) off coil. Take off distributor cap. Pull off cable (3) and vacuum hose (4). 61 12 021 b
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Remove hoses 5 ÷ 8. |  |
Disconnect water hoses 9 ÷ 11 from heater and from equalizing reservoir respctively. Disconnect cable for oil pressure switch at flat plug connection. |  |
Move piston in first cylinder to TDC. Distributor rotor must point at notch in distributor casing. Remove gearbox cover at top cf. 11 14 100. 11 14 100
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Disconnect water hoses (12) and (13). Disconnect cable (14) for remote thermometer switch and support bracket (15) Remove entire ignition lead |  |
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Open safety plates. Remove sprocket. |  |
Note when fitting: Fit on chain in such a way that dowel pin (1) is at bottom left. The bore in the sprocket must be flush with the thread bore and casting tab. |  |
Disconnect pull bar vor operating throttle. Disconnect water hose for intake air preheat. |  |
Remove pipe clamp from exhaust support. Loosen triangular flanges on exhaust muffler. Disconnect exhaust pipes from exhaust manifolds. Note when fitting: Replace sealings. Coat stud bolts with Molycote paste. |  |
Loosen cylinder head studs. Prevent rocker arm shafts from being displaced or distorted by fitting in guide pins. |  |
Remove cylinder head. Note when fitting: Tighten the bolts in the sequence 1 through 14 one after the other in three stages. Run engine to operating temperature. After the test run let engine cool off to 35° C (95° F). Give final torque to cylinder head bolts. The cylinder head bolts are tightened again after a distance of 1000 km (600 miles) and then at the normal intervals. Coution! There should never be oil in the recesses, since otherwise the bolts will not exert full pressure on the cylinder head even though they are tightenend to the specified torque. Besides the crankcase might crack. Note when fitting: The cylinder head gasket must always be replaced. See 11 34 004 for tappet clearance adjustments. Adjust engine idle speed and fuel/air mixture. 11 34 004
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