Loosen the clutch mounting bolts evenly and remove the clutch.
Remove the generator, distributor and starter.
Remove the fan with the coolant pump.
Remove the thermostat housing.
Remove the right and left engine mounts.'
Remove the oil filter and pipes together with the fuel pump.
Pull out the oil dipstick and its tube.
Unscrew the carburetor, fuel lines, fuel portion divider with air portion meter, intake and exhaust manifolds. a Turn the engine and set it to the TDC position.
Remove the cylinder head cover(s).
Mark the relative positions of the camshaft gear and the drive chain with paint or something similar.
Loosen the camshaft gear spacer bolts by holding the camshaft with a suitable wrench.
Remove the gears.
Remove the chain tensioner.
Remove the inner chain guide bars by pulling out the support pins with an impact puller and then removing the chain guide bars.
Loosen and then remove the cylinder head bolts in the reverse order to that shown in the tightening diagram.
Tightening order of cylinder head bolts for M110 engines (280S/280SE)
Remove the cylinder heads. To lift the right head, push the tensioner with the chain toward the middle of the engine, so that the tensioner does not remain hanging.
For M110 (280SE) engines, to remove the camshaft gears (sprockets), both covers on the camshaft housing must be unscrewed in front.
Press out the rocker arm tension springs and remove all rocker arms. To do this, use either a large screwdriver or a puller (N 110 589 046 100).
Remove the upper bearings in the camshaft housing.
Tightening order of cylinder head bolts for V8 engines a. Bolts M8
Press back both camshafts and remove the gears (cogwheels) camshafts.
Remove the guide sprocket by knocking out the support pin using impact puller 116 589 203 300.
Remove the chain guide bar in the cylinder head. To do this, knock out the support pins with an impact puller.
Remove the cylinder head gasket.
Turn the engine over on the mounting stand or, if there is none, place it on a plane to attach the cylinder head. Make sure that the surfaces are not damaged.
Remove the oil pan.
Loosen the bolts securing the oil pump to the crankcase housing and to the bearing cover and pull out the oil pump. On V8 engines, after loosening the bolts securing the oil pump, loosen the bolt on the toothed wheel (sprocket) of the oil pump chain. Tilt the oil pump back and loosen the bolt.
Use a screwdriver to move the chain sprocket off the oil pump and disconnect it from the chain. Then remove the pump.
Remove the damper bar in the crankcase housing after removing the drive mechanism cover (front cover).
Remove the tensioner bracket for the oil pump drive chain after removing the guard.
Remove the intermediate gear for the ignition distributor drive.
If necessary, remove the support bushing in the engine crankcase housing and in the front cover.
Remove the guide sprocket.
Remove the drive chain.
For the M110 engine (280SE), remove the helical gear shaft by knocking out the cover using an impact puller and pulling the helical gear shaft upwards using the MB bolt.
Remove the vibration damper and pulley.
Unscrew the plug bolt in the engine crankcase and remove the oil pressure relief valve.
Remove the distributor housing and remove the clamp.
Loosen the intermediate gear (sprocket) bolt.
Unscrew the chain guard plate. Drive the intermediate gear shaft inward and pull the intermediate gear forward. Unscrew the support sleeve mounting screw and pull out the intermediate gear shaft together with the support sleeve using the M8 screw. If necessary, pull out the rear support sleeve using a puller with an internal projection.
Remove the connecting rod bearing bolt nuts. Mark the bearing cap and remove it together with the lower bearing shell.
Position the engine so that the pistons and connecting rods can be pushed out of the cylinder bore with a hammer handle. On V8 engines made of light metal, take care not to damage the bores. You can use tool N 117 589 009 800 for connecting rods and connecting rod bolts. All associated parts must be marked so that they can be reinstalled in their original position.
Place a piece of hard wood between the crankshaft shoulder and the crankcase housing to hold the crankshaft and unscrew the flywheel from the crankshaft flange. Unscrew the crankshaft bolts from the front, g Mark the relative positions of the crankshaft and hub with a punch or chisel so that the hub groove is aligned with the disc spring during assembly.
Pull out the vibration damper with the pulley and bushing by hand. If necessary, you can use a plastic hammer, but remember that the cast iron pulley is sensitive to impacts.
On a 6-cylinder engine, the balancing disk must be removed using puller N 116 589 103 300.
For vehicles with automatic transmission, unscrew the extension bolts of the transfer disc and remove them together with the toothed rim in the same way as the spacer discs.
Mark all main bearing caps and unscrew their bolts from the crankcase housing.
Carefully lift the crankshaft over the upper bearings. Remove the lower bearing shells.
Carefully remove the piston rings using a piston ring puller. Remove the piston pin retainers and pull out the piston pins. Arrange all parts in the correct sequence.
Remove the drive chain.
Remove the plug bolt and remove the oil pressure relief valve from the main oil line.
Knock out the rear plug (steel ball) using a steel rod (13 mm in diameter and about 700 mm in length) from the front of the engine.