The VS171 twin cam setting/locking tool kit has been designed for use on multi-valve engines (twin cam) to lock the camshafts, which are under pressure from compressed valve springs, from rotating out of their timing positions when the timing belt is removed. If the camshafts are allowed to move from their timing position possible damage to the inlet and exhaust valves may occur due to contact with the piston crown. By locking the camshafts in position it will allow easier replacement of the drive belt and reduce the risk of incorrect valve timing from taking place. The kit includes camshaft locking pins which can also cover specific crankshaft/flywheel locking applications.
OPERATING INSTRUCTIONS
Ensure safety instructions and the manufacturerÂ’s service instruction are adhered to. These instructions are provided as a guide only. For timing belt removal, renewal and refitting, it is often necessary to lock the engine to its stated timing position marks. Vehicle manufacturers use various methods to achieve this important retention of engine timing position during this application.
VS171/1 & VS171/2 CAMSHAFT LOCKING PINS – Multi application use, see chart. When called for in the vehicle manufacturers instructions, the twin camshafts are locked in position, with the timing marks aligned to those on the casing/cover by the use of two locking pins. This method of locking is achieved by inserting the correct pins, of a specific diameter, for each camshaft. These are usually located through assigned holes in the camshaft housing thus engaging and locking the camshafts in position (fig 1). Locking pins can also be used to lock the crankshaft in its timing position. When the vehicle manufacturer calls for this action, the crankshaft is locked in place by inserting the correct diameter locking pin through a hole in the gearbox mounting back plate to engage a corresponding hole in the flywheel (fig 2).

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