reset the preload on a scissor gear secure the camshaft
in a vice on a section that will not damage the lobes or journals. You will need to rotate the scissor gear against spring pressure until the service bolt hole lines up with the thread. Normally a large pair of pliers or multi grips will be sufficient to do this. Holding the gear in place with one hand fit the service bolt all the way through the gear. The bolt only needs to hold the preloaded gear in place and does not need to be any more than finger tight.
Once you have re-fitted the camshafts onto the cylinder head remove the service bolt BEFORE rotating clockwise the camshaft, if you try to turn the engine over with the service bolt fitted it will cause significant damage to the engine.
The noise caused by an incorrectly set scissor gear can be similar to a noisy hydraulic lifter or tappet. After a cylinder head service, many people make the mistake of assuming a hydraulic lifter or tappet clearance is causing an excessive ticking or rattle, but often it is the scissor/preload gear that has not been set.
in a vice on a section that will not damage the lobes or journals. You will need to rotate the scissor gear against spring pressure until the service bolt hole lines up with the thread. Normally a large pair of pliers or multi grips will be sufficient to do this. Holding the gear in place with one hand fit the service bolt all the way through the gear. The bolt only needs to hold the preloaded gear in place and does not need to be any more than finger tight.
Once you have re-fitted the camshafts onto the cylinder head remove the service bolt BEFORE rotating clockwise the camshaft, if you try to turn the engine over with the service bolt fitted it will cause significant damage to the engine.
The noise caused by an incorrectly set scissor gear can be similar to a noisy hydraulic lifter or tappet. After a cylinder head service, many people make the mistake of assuming a hydraulic lifter or tappet clearance is causing an excessive ticking or rattle, but often it is the scissor/preload gear that has not been set.
