Mazda 2006 MX-5 Service Highlights page 71

Oil pump driven chain, oil pump sprocket specification
Oil pump driven chain Pitch size
Outer diameter
Oil pump sprocket
Driven tooth width
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OIL JET VALVE CONSTRUCTION/OPERATION [LF]
Construction
• The oil jet valves are installed in the cylinder block (in the main journal). The oil jet valve nozzles are installed
pointed toward the back surface of each piston.
• The oil jet valves are designed to maintain optimum oil pressure in the engine by controlling the oil injection
according to the oil pressure applied to the check ball in the oil jet valves.
CYLINDER LINER
ENGINE
FRONT
SIDE
Operation
• Oil pressure applied to the check-ball in the oil jet
valve opens and closes the oil passage-way to
the nozzle and controls oil injection starting and
stopping.
• Oil pressure greater than the specified value
applied to the check-ball in the oil jet valve opens
the oil passage to the spring-pressed nozzle,
starting injection. Conversely, oil pressure less
than the specified value applied to the check-ball
blocks the oil passage by spring force, stopping
injection.
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LUBRICATION
Item
OIL JET VALVE
Specification [mm {in}]
8 {0.3}
60.78 {2.392}
6.15 {0.242}
CYLINDER BLOCK
OIL
OIL JET
VALVE
BODY
SPRING
OIL
01–11
E5U011110730N01
PISTON
OIL JET VALVE
EPU111ZS3006
NOZZLE
CHECK BALL
OIL PASSAGE
EPU111ZS3007
01–11–5