Mazda 2006 MX-5 - Page 71

LUBRICATION
01–11–5
01–11
Oil pump driven chain, oil pump sprocket specification
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OIL JET VALVE CONSTRUCTION/OPERATION [LF]
E5U011110730N01
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.
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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Item Specification [mm {in}]
Oil pump driven chain Pitch size 8 {0.3}
Oil pump sprocket
Outer diameter 60.78 {2.392}
Driven tooth width 6.15 {0.242}
ENGINE
FRONT
SIDE
CYLINDER LINER
OIL JET VALVE
CYLINDER BLOCK
PISTON
OIL
OIL JET VALVE
EPU111ZS3006
NOZZLE
CHECK BALL
OIL PASSAGE
OIL
SPRING
OIL JET
VALVE
BODY
EPU111ZS3007