Removal And Installation: Camshafts: Installing
- Tightening specifications, refer to Figure.
Always replace gaskets and seals.
Risk of eye injury.
- Wear safety glasses.
Risk of contaminating lubricating system and bearing.
- Cover open parts of engine.
-- Remove sealant residue on cylinder head and guide frame, for example with rotating plastic brush.
-- Clean the sealing surfaces, they must be free of oil and grease.
-- Oil journal surfaces of camshafts.
-- Place camshafts in cylinder head, noting position of camshafts so that guide frame can be installed without tension.
Left Cylinder Head
- Intake camshaft
- Exhaust camshaft
- Groove on end of shaft must lie as shown in illustration.
Right Cylinder Head
- Exhaust camshaft
- Intake camshaft
- Groove on end of shaft must lie as shown in illustration.
Continued for Both Sides
-- Check location of compression ring ends.
- The compression ring ends -1 and 2- must face upward or downward, and must never face sideways.
Note the expiration date of the sealing compound.
-- Cut tube nozzle at front marking (nozzle diameter approximately 2 mm).
-- Lay a new seal -2- in guide frame groove.
Risk of contaminating camshaft bearing with excess sealant.
- Do not apply sealant beads thicker than specified.
-- Apply sealant beads -1, 3, 4- on clean guide frame sealing surfaces as shown in illustration.
- Thickness of sealant beads: 2.5 mm.
-- Immediately place guide frame on cylinder head.
Ensure camshafts can be inserted in guide frame axial bearing without force.
-- Insert the T40116 in the guide frame and cylinder head.
Because the sealant begins hardening immediately, guide frame must be promptly positioned and tightened.
After the guide frame has been installed, sealant must harden approximately 30 minutes.
-- Tighten guide frame bolts. Refer to Figure.
-- Drive sealing plugs -arrows- in flush.
-- Remove the T40116 with the T10133/3.
-- Rotate the intake camshaft to "TDC" and the tighten camshaft adjuster screw -2- on the camshaft with a 24 mm socket -1- inserted between as illustrated.
To tighten screw, counterhold socket with pliers if necessary.
-- Position a lever or ratchet with T10035 on screw and rotate camshaft until threaded holes for T40070 face up.
-- Next, loosely fasten T40070 to intake camshaft.
- The T40070 is correctly positioned when the holes for the cylinder head bolts remain free.
-- Adapt camshaft adjuster screw -2- and socket 24 -1- to exhaust camshaft.
-- Rotate exhaust camshaft until threaded hole for Camshaft ClampT40070 faces up.
-- At the same time, position a counter-hole SW 24 on T40070 and swing T40070 against exhaust camshaft to install -arrow-.
-- Tighten T40070 by hand onto exhaust camshaft to avoid damaging threads (2nd technician needed).
-- Tighten T40070 bolts to 25 Nm.
-- Using T40058, rotate crankshaft in direction of engine rotation -arrow- to "TDC".
-- Screw 3242 into hole to 20 Nm, if necessary rotate crankshaft very slightly back and forth to completely center the holder.
The rest of the installation is in reverse order of removal, note the following:
-- Position camshaft timing chains on camshafts Installing .
Risk of damaging valves and piston heads after working on valvetrain.
- The motor must not be started for about 30 minutes after installing camshafts because the hydraulic equalization elements must seat themselves.
- To ensure valves do not strike pistons when starting, carefully rotate engine at least 2 full revolutions.