For twin cam engines where both camshafts have to be locked in place while servicing cylinder head and / or timing chain.

For M52 single Vanos engines, ET1121B-4 is also required / For M52 | M54 dual Vanos engines, ET1121B is also required.

For setting the timing position on camshaft & crankshaft during belt or chain replacement. The pre-load tool for the primary timing chain tensioner has two threaded nuts M22 x 1.5 (M42 / M60) & M26 x 1.5 (M50 / M52). Also includes locking tools for engines with twin VANOS (VVT) units on BMW M52 (TU) / M54 / M56 essential for dismantling, assembly & timing of the twin VANOS engines plus the VANOS engagement wrench for BMW twin camshaft single VANOS (VVT) unit mounted on the inlet camshaft.