Genuine Mercedes-Benz 190E Cam Gear

Mercedes-Benz 190E Cam Gear Parts and Q&A

• Camshaft Gear
  102-050-01-04
  Q: 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?

  A:

  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.
• Camshaft Gear
  102-052-06-01
  Q: How to remove, inspect, and refit the Cam Gear, Crankshaft Timing Gear, Timing Chain Guide and Timing Chain Tensioner in the Diesel engine on Mercedes-Benz 190E?

  A:

  Possibly, by unscrewing the tensioner body of the cylinder head but not the cover, plug, and reclaim the sealing ring to eliminate the tensioner. Make no attempt to dismantle the tensioner assembly, unless necessary; it may be worn out or faulty, in which case change the whole. Prior to refitting, fill the tensioner with oil, i.e. plunge in engine oil and press the plunger seven to ten times until it bottoms out in the stopping plunge, to avoid the plunger hardening thenceforth. Insert the tensioner in the cylinder head and screw tight with the correct amount of torque. According to the case of camshaft sprocket, lift off the auxiliary drivebelt and camshaft cover, and subsequently the tensioner of the timing chain. Mark the timing chain and camshaft sprocket, where relevant, and remove the self-leveling suspension hydraulic pump and line so that No 1 piston aligns at TDC. Weakly loosen the sprocket on the bolt, without turning the camshaft, then reclaim the washer, and remove the sprocket itself, observing its position. Check the teeth on the sprocket, should it be concave, change the sprocket. When refitting, align timing marks, fit the sprocket into the chain and clamp it with the bolt and washer. Install the hydraulic pump (where applicable) and tensioner of the timing chain and, after one full crankshaft rotation, make sure everything was properly aligned. Install camshaft cover and auxiliary drivebelt. The crankshaft sprocker is the same, but you should take the timing chain cover and sump off followed by the camshaft sprocker and leave the timing chain dangling. Take the oil pump drive chain tensioner rail and spring off, unscrew the oil pump drive sprocket and take alignment marks. Take the crankshaft sprocket off using a puller and recapture loose Woodruff key. Installation Use realignment marks to transfer to a new sprocket (refit the Woodruff key accordingly), install the timing chain so that both sprockets are engaged and snap the oil pump sprocket and chain in place before replacing the chain. Connect the sump and timing chain cover with the oil pump drive chain tensioner rail and spring, and then remount the oil pump drive chain tensioner rail. On the fuel injection pump sprocket, follow the given procedure. You have to disinstal the cylinder head and timing chain cover before removing the tensioner rail by pulling it out of its lugs. Check wear or damage and change as necessary. Install timing chain tensioner, cultivator and timing cover toprail, and cylinder head. In the case of upper guide rail, unscrew a camshaft sprocket on the bottom-side of the upper guide rail, screw a bolt on a location pin of the guide rail, and use a slide hammer to chisel out the location pin without dropping the rail into the housing. Take off the guide rail and examine wear. The installation reattaches the guide rail by adhering it in place with sealant in the pins. Last, re-fit the camshaft sprocket. To disassemble the lower guide rail, take out the timing chain tensioner and timing chain cover, then remove the guide rail out of its pin and check the wear on it, and replace the guide rail on the pin again, and reattach timing chain tensioner and timing chain tensioner cover.