Question 1

How to remove and refit the Cam Gear, Crankshaft Timing Gear, Timing Chain Guide and Timing Chain Tensioner in the Six-cylinder petrol engine on Mercedes-Benz 190E?

Accepted Answer

The tensioner is to be eliminated by disconnecting (removing) the battery negative lead, lifting (fully) the bonnet, unscrewing timing chain tensioner cover nut and withdrawal of spring and sealing ring. With a large Allen key or hexagon bit, unscrew the tensioner threaded ring and pull out of the housing then take out the tensioner plunger/body assembly. Put tensioner plunger and locking clip out of tensioner body. To clean, wash the pieces and see whether there is any damage or wear or tear in the plunger and body, and replace the locking clip and tensioner spring where appropriate. To refit, place the tensioner body into the housing, screw the threaded ring in, tighten, pop the plunger with the locking clip into the body, place the spring and a new sealing ring on the cover nut then screw it on to the tensioner body tighten. Re-Connect the negative lead of the battery. In order to remove the camshaft sprocket, replace the upper timing chain cover, the engine rotated to locate engine No 1 piston at TDC and timing chain tensioner has been removed. Mark reference posts on the camshaft sprocket and the next timing chain link, unscrew the securing bolts, and pull out the sprocket with tension remaining in the chain. Check the wear of teeth of the sprockets, replacing where required. To refit make sure timing marks correspond, insert the sprocket in the chain using a sprocket and lock it using bolts. Have the timing chain tensioner refitted and ensure that the engine is turned after refitting. On crankshaft sprocket, heat to about 50o C, cut tensioner rail related to timing chain off, and cover sump opening. Remove the lubs on an oil pump drive chain link, hold the chain and spin the crankshaft sprocket out of the gear with a puller. Inspect the sprocket when required. When refitting, warm up the sprocket, place it in line with the key and slide it over onto the crankshaft. Install the timing chain about these two sprockers, re-attach the drive chain of the oil pump with another one, and tie it down. Install the timing chain tensioner rail and top, install the oil pump drive chain Tensioner Rail and tensioner Rail connecting the engine to the drive pin. In the case of the guide rail, alignment marks are made by first rotating the engine so that No 1 piston reaches TDC, then using the lower timing chain cover. Take out camshaft sprocket, release the clips in retaining it and pull away the parts of the guide rails. Check wear or damage and replace where needed. To refit the chain drill the inner section in, then lay the chain into the rail and clamp the outer section in place. Install new camshaft sprocker and bottom timing selection door. With the tensioner rail, swing the engine so that No 1 piston is placed at TDC, strip away the lower timing chain cover and draw up an alignment marks. Move the tensioner rail out of the pivot pin and check for wear or wear and tear and replace. To refit, insert the rail until it snaps up into place, into position relative to the pivot pin and timing marks, then fit the lower timing chain cover back in place.

Question 2

How to remove, inspect, and install the cam gear and camshaft in the Four-cylinder engines on Mercedes-Benz C230?

Accepted Answer

Take the cable off the negative side of the battery and pull off the valve cover and upper timing cover at the front of the cylinder head. In 2002 models, cylinder number one With the type 111 motor, turn the engine until the 30 mark matches the pointer on the timing cover at a 30-degree After TDC to avoid interference between the valve and the piston. Label correspondingly with paint on the sprockets and the links of the chain to be reassembled and then remove the alternator. Relax the tensioner of the timing chain and undo its screw, trying not to lose its sealing ring. Take the sprocker off the exhaust camshaft, leaving the camshaft in position, and then take the timing chain off the intake camshaft sprocker, instead of leaving it on the sprocker, holding it with a piece of wire. To reduce tension on the cam lobes, check the markings on the camshaft bearing caps, and detach the caps in their order before trying to remove the camshafts, and always have the caps in their place. On 2003-2005 models using the type 271 engine, rotate engine to TDC cylinder 1, apply matching paint dots, push tensioning rail to provide slackness to remove chain off intake camshaft sprocket. Slacken the bearing cap bridge bells, break away the upper part, and drag the timing chain to remove the cam-followers, holding the chain-up by wire. In case of removal of sprockets, loosen sprocket center bolt whilst holding up the camshaft. Check the camshaft secondary sprockers, check the chains with cracks, and check the tensioner of the chain with too much wear, replacing any damaged parts. Once camshaft is cleaned, scanned lobe height of each cam Lobe, checked bearing journals, replaced upon change more than 0.010 inch should be checked. Examine camshaft lobes to determine whether they are in a worn or discoloured state and provides that they are satisfactory, may be reused. This is done by greasing the lobes of the camshaft and bearing journals, then attaching the camshafts, and centering the sprockets by reference to the paint marks. When using type 271 engines, the chain has to go round the second camshaft so you pull the camshaft guide back to accommodate it. Install bearing caps / bearing cap bridge and tighten bolts hand tight, and then torque in the correct order. Install new tensioner body and end piece, then attach Sealing rings, clamp them to the recommended torque, and carry out the rest of the installation by reversing the order of removal.

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