4. Timing Chain
The timing chain system is a known fault. The part that fails is the hydraulic tensioner which uses oil pressure to tension the chain. The cases that I am aware of have been when engines are running fine before being switched off, then not able to be turned over again. Having had direct information from a major race engine builder in the UK, this problem has occurred mostly after an oil change.
When the oil has been dropped and the car left over the pit until the sump is dry, the tensioner ends up being empty with no pressure on the chain, this is worse if an engine flush has been used. Upon starting the engine it will take some seconds before oil pressure inside it has been re-established and thus during cranking the chain is slack giving it an opportunity to jump. The older and more worn the timing chain, the more likely it is to jump.
There is no update or new part for this problem
Solution:
Regular services, ideally every 5-10k with the best oil you can afford that is 0W-40. If
not, 10W-40. Also when doing servicing, fill the oil filter up with oil before fitting and
don’t allow the sump to drain dry during the emptying phase of the oil change. Once it
starts trickling, put the sump plug back in and fill the engine with new oil.
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