If spurt holes are blocked, what is the most likely immediate effect on engine operation?
Increased friction in moving engine components
Spurt (or squirt) holes are small drilled passages, typically in the connecting rod big end, that spray a jet of lubricating oil onto the cylinder walls, gudgeon pin and underside of the piston.
If these holes are blocked, oil can no longer reach and lubricate those surfaces, so metal-to-metal rubbing increases.
The immediate consequence is increased friction (and heat and wear) in the moving parts that depended on that oil spray.
Hence, blocked spurt holes cause increased friction in moving engine components.
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