Camshaft Oil Seal: Service and Repair
Camshaft oil seals, replacing
Replacing exhaust camshaft oil seal
Removing
- Remove noise insulation in center and on right-hand side.
- Remove ribbed belt and tensioning element.
- Remove upper toothed belt guard.
- Set crankshaft to markings for TDC of No. 1 cylinder -arrows- by turning central bolt on crankshaft sprocket in direction of rotation.
- Disconnect vacuum hose from activated charcoal filter and from throttle valve connection.
- Unbolt coolant expansion tank and power steering reservoir, but do not disconnect the hoses.
- Screw M5x55 stud -1 - into toothed belt tensioning element. Screw hex nut -2- with a large washer -3- onto stud -1 -.
- Tension pressure piston of tensioning element just enough so that it can be secured with a suitable locking pin (e.g. from lifting appliance 2024 A).
Note:
If it is not possible to insert the locking pin, carefully tension the pressure piston of the tensioning element just enough to allow the toothed belt to be removed.
- Take toothed belt off camshaft sprocket.
- Loosen camshaft sprocket (counter-hold with 3036).
- Pull off camshaft sprocket.
- To guide oil seal extractor, screw securing bolt for camshaft sprocket -arrow- into camshaft as far as it will go by hand.
- Remove inner part of oil seal extractor 2085 two turns (approx. 3 mm) out of the outer part and lock in position with knurled screw.
- Lubricate threaded head of oil seal extractor 2085, place it in position and, exerting firm pressure, screw it into oil seal as far as possible.
- Loosen knurled screw and turn inner part of extractor against camshaft until oil seal has been extracted.
Installing
- Lightly oil sealing lip of oil seal.
- Install guide sleeve 3241/2 onto camshaft journal.
- Slide oil seal over guide sleeve.
- Press oil seal in onto stop with press sleeve 3241/1. To do this use bolt 3241/5.
- Install camshaft sprocket.
^ Check installation position: The narrow web of the camshaft sprocket faces outward -arrows- and the marking for No. 1 cylinder TDC is visible.
- Install securing bolt for camshaft sprocket (use counter-hold tool 3036).
- Align camshaft sprocket mark with marking on cylinder head cover.
- Align vibration damper marking with marking on lower part of toothed belt guard.
Note:
If a piston is at TDC the valves could strike the piston when turning the camshaft. To avoid damage to valves and pistons the pistons must not be at TDC.
- Install toothed belt onto camshaft sprocket.
- Pull out locking pin (arrow) and loosen piston of toothed belt tensioning element. Remove stud -1-.
- Turn crankshaft two complete turns in engine direction of rotation, set again to TDC and check adjustment.
- Install upper toothed belt guard.
- Install ribbed belt and tensioning element.
Tightening torques
Replacing intake camshaft oil seal
Removing
- Remove ribbed belt.
- Pull connector off Camshaft Position (CMP) Sensor -G40- (arrow).
- Remove toothed belt guard (upper section).
- Remove Camshaft Position (CMP) Sensor housing.
- Remove Camshaft Position (CMP) Sensor rotor and washer.
- To guide oil seal extractor, screw bolt 2085/1 by hand into camshaft as far as it will go.
- Remove inner part of oil seal extractor 2085 two turns (approx. 3 mm) out of the outer part and lock in position with knurled screw.
- Lubricate threaded head of oil seal extractor 2085, place it in position and, exerting firm pressure, screw it into oil seal as far as possible.
- Loosen knurled screw and turn inner part of extractor against camshaft until oil seal has been extracted.
Installing
- Lightly oil sealing lip of oil seal.
- Install guide sleeve 3241/2 onto camshaft journal.
- Slide oil seal over guide sleeve.
- Press oil seal in onto stop with press sleeve 3241/1. To do this use bolt 3241/3.
- Install notch in Hall sensor rotor into intake camshaft.
- Install washer (conical taper facing outward).
- Install Camshaft Position (CMP) Sensor housing.
- Install toothed belt guard (upper section).
- Connect Camshaft Position (CMP) Sensor connector.
- Install ribbed belt.
Tightening torques
