A failed vacuum pump caused the timing chain to snap? Can somebody explain that to me?
What’s a vacuum pump on an engine? I thought they all tapped the vacuum in the intake manifold.
I recall seeing vacuum “motors” that drove windshield wipers eons ago.
This vacuum pump is driven by the chain. It seized up and damaged the chain, and that threw off the valve timing.
A failed vacuum pump caused the timing chain to snap? Can somebody explain that to me?
What’s a vacuum pump on an engine? I thought they all tapped the vacuum in the intake manifold.
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Many mini’s are supercharged so it’s possible they have vacuum pumps for brake boost (like most diesels) I just don’t know ...
The timing chains are poor quality and are “stretching” beyond what the tensioners can adjust for... these are interferance engines (all the high performance ohc engines are) ... a chain doesn’t actually stretch ,, the joints wear and the cumulative wear on hundreds of joints has the appearance of stretch... if the stretch becomes excessive it’s possible to hammer an exhaust valve with a piston and (guessing here) the shock of the interferance and sudden massive increase in force as the valve hitting the piston attempts to stop the cams rotation , that shock snaps the (already weak/worn) chain and likely holes a piston.