Chevrolet 70 1969 Series, Shop Manual

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6V-53 DIESEL ENGINE 6C-17
LOW OIL PRESSURE-Cont.
OIL PUMP
INTAKE SCREEN PARTIALLY CLOGGED—Remove oil pan and screen, clean oil pan and screen,
refer to “Engine Oil Viscosity Chart” and refill crankcase and change oil filter element.
RELIEF VALVE NOT PROPERLY FUNCTIONING—Remove and inspect valve, valve bore, and
spring.
AIR INTAKE IN PUMP INLET SYSTEM-Disassemble piping and install new gaskets.
PUMP WORN OR DAMAGED—Remove pump, clean and replace defective parts.
LEAK PRESSURE SIDE—Remove pump and replace gasket.
EXCESSIVE C R A N K C A SE PRESSURE
CYLINDER BLOW-BY
CYLINDER HEAD GASKET LEAKING—Remove and replace head gaskets.
PISTON AND LINER DAMAGED—Remove and replace piston and liner.
PISTON RINGS WORN OR BROKEN—Remove and replace piston rings.
PISTON PIN RETAINER LOOSE-Remove.
BREATHER RESTRICTION
OBSTRUCTION OR DAMAGE TO BREATHER—Clean, repair or replace breather.
AIR FROM BLOWER OR AIR BOX
DAMAGED BLOWER-TO-BLOCK GASKET—Remove blower and gasket, replace with new
gasket.
ENGINE BLOCK END PLATE GASKETS LEAKING-Replace block to end plate gaskets.
BLOWER OIL SEAL LE AKIN G—Remove and overhaul blower.
EXCESSIVE EXHAUST BACK PRESSURE
EXCESSIVE MUFFLER RESISTANCE—Repair or replace muffler.
OBSTRUCTION IN MUFFLER-Repair or replace muffler.
EXHAUST PIPING—Replace damaged pipes.
CHEVROLET SERIES 70 -80 H EAVY DUTY TRUCK SH O P M A N U A L