Genuine Mercedes-Benz 190E Timing Cover

Mercedes-Benz 190E Timing Cover Parts and Q&A

• Timing Cover
  103-015-01-02
  Q: How to remove and refit the upper and lower timing cover in the Six-cylinder petrol engine on Mercedes-Benz 190E?

  A:

  A new timing chain cover seal, a proper sealant to the upper cover, and a new coolant pipe O-ring need to be introduced at the time of refit as the camshaft oil seal may also require a new seal. In order to do away with it, unclip the cooling fan shroud and stack it on top of the fan blades and then strip off the camshaft cover. When necessary, remove the cover attached to the distributor cap, disconnect coil HT lead, unscrew securing screws and put distributor cap aside. Partial drain of cooling system, loosen the heating system hose, unscrew the tightening bolts to extract the cooling pipe, and extract the O-ring. Take out the distributor rotor arm and rotor arm drive sleeve, and release the plastic cover of the upper timing chain cover, through unclips. Unscrew the securing bolts and take off the cover, lightly tapping it to get it off the cylinder head if needed and loosen the gasket. To refit, clean up the mating faces, replace the camshaft oil seal by forcing out the old camshaft oil seal prying open the old seal, cleaning the seating face and then tapping in the new seal. Use a sealant to the joints, and use a new gasket, then use a sealant to upper timing chain cover face of the mating parts. Apply clean engine oil to the lips of the oil seal, fit the cover over and connect the securing bolts, tightening them to the required extent. Clean off any residual sealant, pull off all the protective tape, install the distributor cap, camshaft cover and cooling fan shroud, and then replench the cooling system. Other parts such as the lower cover should be refrigerated with an appropriate sealant, new cooling fan bracket bolt seal and new coolant pipe O-ring but it is recommended to replace crankshaft front oil seal as well. The first thing to do is to remove the battery negative lead and lift up the bonnet. Where needed, disassemble the engine undershield, air cleaner assembly, radiator and radiator fan blades. Unscrew the fixing bolts on the cooling fan clutch and others and then dismount the auxiliary drivebelt and pulleys. Disconnect the hose to the hydraulic fluid unless there is one, remove the crankshaft pulley, and the coolant pipe. Following the above description, pull off the top timing chain cover, and unscrew the upper bolts attached to the top of the power steering/self-leveling suspension pump bracket and pivot the top end out. Unsrew the bolts which attach the pump and deassembly screw the cooling fan pulley bracket out. Uncouple the wiring of the alternator and take out the alternator mount bracket. Take out the Timing Chain Tensioner and unscrew the bolts holding the sump onto the timing chain cover with a record of position. Toby, very carefully, draw the cover back off its dowels without rupturing the sump gasket. To refyt, wash down the mating faces, examine the condition of the sump gasket and replace a crankshaft oil seal as above indicated. Repeal the seal at the bottom cooling fan melt point, on the cylinder block matching face and squash the cover over the crankshaft taking special care to ensure suitable participation with the dowels. Install the screws, making sure that they are in the correct place, and then screw them to the correct tightness. Reattach the sump-to-timing chain cover bolts, and again position any hoses properly and fit them. Re-fit the timing chain tensioner, alternator, and the crankshaft position sensor and re-connect the wiring. Install the cooling fan bracket and power steering pump again using sealant at the points of the bolts. Install the upper timing chain cover back in place, and any re-routed hoses, cables, and re-assembly of other parts, such as crankshaft pulley, auxiliary drivebelt, cooling fan blades and radiator. Lastly, add some cooling system fluid, ensure the levels of engine oil and power steering fluid are normal, and re-install the negative lead of the battery.