Quick crankshaft pulley question

DrRobin wrote:

The woodruff probably gets damaged using the 'starter motor' technique, as the rotational force is through the shaft (and key) to the bolt and it's probably the jolt or repeated jolt which damages the key.
 

The woodruff keys get damaged because the crank pulley bolt is improperly torqued, the woodruff key is meant to locate the pulley, not to drive it (withstand the torsional forces) - this is a well known (and well understood problem) with quite a few different engines - Suzuki's G16 engines are one example, Suzuki issued a TSB (4-23 07196) instructing that the bolt be tightened to 130Nm, the previous specification was 110Nm.

Whilst I agree with you about the general purpose of a woodruff key, it's there for location, think about a timing gear and is not meant to provide drive (that would use a splined shaft) why does the flywheel pulley even have a woodruff key, there is no timing to maintain?

I suspect Suzuki put it there to stop the pulley from turning whilst under load, or just possibly to stop the pulley from turning whilst the bolt is torqued and using the special tool.

Robin

DrRobin wrote:

Whilst I agree with you about the general purpose of a woodruff key, it's there for location, think about a timing gear and is not meant to provide drive (that would use a splined shaft) why does the flywheel pulley even have a woodruff key, there is no timing to maintain?

I'm just going to leave this here for you to look at...