PERIODIC MAINTENANCE 2-33 OIL PRESSURE CHECK Check the engine oil pressure periodically. This will give a good indication of the condition of the moving parts. OIL PRESSURE SPECIFICATION 100 – 400 kPa (1.0 – 4.0 kgf/cm2, 14 – 57 psi) at 3 000 r/min, Oil temp. at 60 °C (140 °F) If the oil pressure is lower or higher than the specification, the following causes may be considered. LOW OIL PRESSURE * Clogged oil filter * Oil leakage from the oil passage * Damaged O-ring * Defective oil pump * Combination of the above items HIGH OIL PRESSURE * Engine oil viscosity is too high * Clogged oil passage * Combination of the above items OIL PRESSURE TEST PROCEDURE E Start the engine and check if the oil pressure indicator light is L turned on. If the light stays on, check the oil pressure indicator light circuit. If the circuit is OK, check the oil pressure in the fol- lowing manner. P • Remove the main oil gallery plug 1. M • Install the oil pressure gauge and adaptor into the main oil gallery. A • Warm up the engine as follows: S Summer: 10 min at 2 000 r/min Winter : 20 min at 2 000 r/min • After warming up, increase the engine speed to 3 000 r/min (observe the tachometer), and read the oil pressure gauge. 09915-74521: Oil pressure gauge hose 09915-74540: Oil pressure gauge attachment 09915-77331: Meter (for high pressure) Oil gallery plug (M16): 35 N·m (3.5 kgf-m, 25.5 lb-ft)