Genuine Mercedes-Benz 190E Camshaft

Mercedes-Benz 190E Camshaft Parts and Q&A

• Camshaft
  102-050-55-01
  Q: How to the remove of the camshaft and valve lifter in the Diesel engine on Mercedes-Benz 190E?

  A:

  Before removing the camshaft, the condition of the valve lifters can be checked, and a new camshaft endfloat control thrustwasher may be required upon refitting. Begin by removing the camshaft sprocket. The camshaft bearing caps are numbered from the timing chain end of the engine; ensure that marks are present and make suitable marks if necessary. The bearing cap bolts must be slackened progressively. For a 4-cylinder engine, remove the bolts from bearing caps 1, 3, and 5, lift them off in order, and then progressively slacken the bolts for bearing caps 2 and 4 until all pressure on the camshaft is relieved before fully unscrewing and lifting off those caps. For a 5-cylinder engine, follow a similar process for bearing caps 1, 2, and 6, then for caps 3, 4, and 5. After lifting the camshaft from the cylinder head, remove the camshaft endfloat control thrustwasher and withdraw the hydraulic valve lifters, storing them upright in clean engine oil. Inspect the camshaft bearings and lobes for damage, and check the valve lifters and spacer washers for wear, renewing as necessary. The operation of the valve lifters can be checked by pressing down on each and measuring the piston movement. If any lifter piston moves more easily, it should be renewed. Check the valve lifter bores for wear, and if serious damage is evident, the cylinder head must be renewed. To check valve lifters in situ, run the engine to normal operating temperature, check the oil level, and remove the camshaft cover. Position the No 1 piston at TDC, ensure the valves are closed, and measure the clearance between the valve lifter and camshaft lobe. Renew any lifter with excessive clearance, and repeat the procedure for the remaining lifters. After checking, refit the camshaft cover. For refitting, lubricate the valve lifters and return them to their original locations, ensuring they slide freely. Check the condition of the camshaft endfloat control thrustwasher and renew if necessary, then lubricate the camshaft and bearing locations before laying the camshaft in position. Lay the bearing caps over the camshaft and tighten the securing bolts progressively, ensuring even pressure. Finally, refit the camshaft sprocket.
• Camshaft
  102-050-28-01
  Q: What is the general information and procedure for removing, dismantling, inspecting, reassembling, and refitting the camshaft and valve lifter in the Four-cylinder petrol engine on Mercedes-Benz 190E?

  A:

  The camshaft bearing caps have rocker gear embedded in them, and the rocker arms are fitted on separate short rocker shafts that insert into the caps. One bearing cap consists of one exhaust and one inlet rocker arm, and the drillings-to-hydraulic valve lifters are fixed to the rocker arms. When starting removal, air cleaner assembly and camshaft cover should first be removed and after that the camshaft sprocket. In models whose valve clearances are manually adjustable, the locknuts need to be loosened, and rocker arm adjuster screws unscrewed. The rocker arms and bearing caps should be examined and an identification mark pigmented upon them, where a mark may be missing. The cap bolts on the camshaft bearing should be smoothly unscrewed in a diagonal pattern, then the oil spray pipe and camshaft bearing cap/rocker assemblies are removed, taking care not to force out stuck ones. In those hydraulic lifters, the camshaft has to be raised out of the cylinder head, with the pads of the valve lifters removed one after another. These camshaft bearings and lobes must be inspected too, and when needed, the camshaft and rocker arms also must be replaced at the same time. The rocker arms are taken off by straightening the short rocker shafts, them drawing a mark so that it may be replaced in its former position. He prefers the tool used by the manufacturer to remove rocker shafts, however an alternative is a long bolt. Adjusters and rocker arm wear must be inspected and parts washed prior to repositioning. Before reassembly, the contact surfaces should be lubricated bearing in mind that all parts must be restored in their correct position and with the right orientation. A mandrel should be used to remove valve lifters and spacer washers must be kept tidy. Wear on the valve lifters and washers must be checked and if excessive wear is detected, spacer washers of varying thickness might be needed. Refitting valve lifters must be filled with engine oil prior to replacement, and the spacer washer correctly installed. It is necessary to lubricate the camshaft, make certain that timing marks are correctly aligned and to refit valve lifter contact pads and bearing caps back in place. Aligning of oil spray pipe with oil holes and tightening of bearing cap bolts should be done on progressive basis. Check camshaft timing mark, re-install camshaft sprocket, cover, and air cleaner assembly and set valve clearances.