Valve Timing Procedures

M62 TU valve timing adjustment requires setting the VANOS transmissions to the max. retard positions with an ohmmeter and attaching the camshaft gears to each camshaft with single reverse threaded bolts.

• After locking the crankshaft at TDC, the camshaft alignment tools (P/N 90 88 6 112 440) are placed on the square blocks on the rear of the camshafts locking them in place.
• The exhaust camshaft sprockets and VANOS transmission units with timing chains are placed onto their respective camshafts.
• The exhaust camshaft sprockets and VANOS transmissions are secured to the camshafts with their respective single, reverse threaded bolt. Finger tighten only at this point. Install the chain tensioner into the timing chain case and tension the chain.
• Connect an ohmmeter across two of the three pin contacts on the front edge of one of the VANOS transmissions. Twist the inner hub of transmission to the left (counter clockwise). Make sure the ohmmeter indicates closed circuit. This verifies that the transmission in the default max retard position.
• Using an open end wrench on the camshaft to hold it in place, torque the VANOS transmission center bolt to specification.