Before you remove the left camshaft, ensure the
Timing Chain is removed correctly or you may damage the valves or pistons by forcing only one camshaft or crank. Special Tool 8379 helps keep the tension from the ratchet too high when removing an outboard cam sprocket, timing chains or camshaft. Start by taking out the cylinder head cover and put the engine at its top dead center position for No. 1 cylinder so that the "V6" marks on the cam sprocket lie at 12 o'clock. Connect one link on the secondary timing chain to the V6 mark on each side to mark the position for installation. Proper maintenance means taking care not to press on the camshaft target wheel. Try to remove the camshaft sprocket retaining bolt, secure the chain tensioners, enough to loosen the bolt; just make sure they remain secured to keep the chain tension from increasing. Push Special Tool 8379 between the timing chain strands and tap it to hold the chain in place against the arm and guide. After inserting Special Tool 8428, remove the bolt and sprocket and turn the camshaft 5° clockwise to its neutral position. Screw the retaining bolts in the bearing cap, one at a time, until all the pressure on the caps is gone and avoid hitting the caps to avoid damaging them. Identify the
Rocker Arms ahead of time and afterwards take out the bearing caps and camshaft. When installing, coat the camshaft journals with oil and put the camshaft on the left so the sprocket dowel at the 1 o'clock location makes it easier to install the bearing caps. Calibrate the stamped arrow positions from the front and loosely install camshaft vane bolts in the cylinder head in order from front to back. Begin with the middle banding cap and use 1/2 turns to tighten each bolt until you reach 11 Nm (100 inch lbs.). Set the camshaft drive gear right against the timing chain, matching the V6 mark with two chain links and rotate the camshaft using Tool 8428 until the dowel on the sprocket fits in the slot. Set the sprocket in place and clean off any excess oil so you don't over-torque the bolt, then tighten it manually with your fingers. Once the timing chain wedge is gone, secure the camshaft sprocket retaining bolt with Special Tool 6958 using adapter pins 8346, then gob-stopper the cylinder head cover into place.