ENGINE LUBRICATION & COOLING SYSTEMS
SECTION LC
CONTENTS
SERVICE DATA AND SPECIFICATIONS .......... LC-2
Engine Lubrication System ............................. LC-2
Engine Cooling System .................................. LC-2
Recommended Lubricants ............................. LC-3
TROUBLE DIAGNOSES
AND CORRECTIONS ......................................... LC-4
Engine Lubrication System ............................. LC-4
Engine Cooling System .................................. LC-5
ENGINE LUBRICATION SYSTEM ..................... LC-6
Lubrication Circuit ........................................... LC-6
Oil Pressure Check (On-vehicle service) ....... LC-7
Oil Pump ......................................................... LC-8
Oil Filter Bracket ........................................... LC-10
Oil Cooler ..................................................... LC-11
Oil Jet ........................................................... LC-12
COOLING SYSTEM .......................................... LC-13
Cooling Circuit ...............................................LC-13
Cooling System Inspection ............................LC-14
Water Pump ..................................................LC-15
Water Outlet and Thermostat,
Cooling Fan ...................................................LC-17
Radiator .........................................................LC-18
SPECIAL SERVICE TOOLS ............................. LC-19
Special Service Tools ....................................LC-19
LC-2
SERVICE DATA AND SPECIFICATIONS
SERVICE DATA AND SPECIFICATIONS Engine Lubrication System
OIL PRESSURE CHECK
OIL PUMP INSPECTION
Unit: mm (in)
TIGHTENING TORQUE
Engine Cooling System
THERMOSTAT
RADIATOR
Unit: kPa (bar, kg/cm
2
, psi)
Engine speed
Approximate discharge pressure
kPa (bar, kg/cm
2
, psi)
Idle speed 98 (0.98, 1.0, 14)
3,000 rpm 294 - 441 (2.94 - 4.41, 3.0 - 4.5, 43 - 64)
Gear side clearance 0.05 - 0.13 (0.0020 - 0.0051)
Gear backlash 0.07 - 0.11 (0.0028 - 0.0043)
Oil pump bushing clearance Less than 0.15 (0.0059)
Oil pump bushing inside diameter 13.012 - 13.098 (0.5123 - 0.5157)
Drive gear shaft outside diameter 12.974 - 12.992 (0.5108 - 0.5115)
Unit N•m kg-m ft-lb
Oil pump fixing bolt 13 - 19 1.3 - 1.9 9 - 14
Oil cooler securing bolt 16 - 21 1.6 - 2.1 12 - 15
Oil filter bracket fixing bolt 16 - 21 1.6 - 2.1 12 - 15
Oil jet bolt (for piston) 29 - 39 3.0 - 4.0 22 - 29
Oil pump relief valve 29 - 49 3.0 - 5.0 22 - 36
Oil cooler short valve 29 - 49 3.0 - 5.0 22 - 36
Regulator valve 29 - 49 3.0 - 5.0 22 - 36
Valve opening temperature °C (°F)
82 (180)
Max. valve lift mm/°C (in/°F)
8/95 (0.31/203)
Cap relief pressure
78 - 98 (0.78 - 0.98, 0.8 - 1.0, 11 - 14)
Leakage test pressure
98 (0.98, 1.0, 14)
LC-3
SERVICE DATA AND SPECIFICATIONS
SERVICE DATA AND SPECIFICATIONS Recommended Lubricants
LUBRICANTS
SAE VISCOSITY NUMBER CHART
TIGHTENING TORQUE
Lubricant Specifications Remarks
Gasoline engine oil API SD or SE For further details, refer to the recommended SAE
viscosity chart.
Diesel engine oil API CD
Anti-freeze
—
Ethylene glycol base
Long Life coolant
Unit N•m kg-m ft-lb
Water pump M8 16 - 21 1.6 - 2.1 12 - 15
M10 30 - 41 3.1 - 4.2 22 - 30
Thermostat housing bolt 16 - 21 1.6 - 2.1 12 - 15
Water outlet bolt 16 - 21 1.6 - 2.1 12 - 15
Fan securing bolt 7 - 9 0.7 - 0.9 5.1 - 6.5
Cylinder block drain plug 20 - 29 2.0 - 3.0 14 - 22
Water temperature sensor 15 - 25 1.5 - 2.0 11 - 18
LC-4
TROUBLE DIAGNOSES AND CORRECTIONS
TROUBLE DIAGNOSES AND CORRECTIONS Engine Lubrication System
Condition Probable cause Corrective action
Oil leakage Damaged or cracked pump body cover. Replace.
Oil leakage from gasket and oil seal. Replace.
Oil leakage from regulator valve. Tighten or replace.
Oil leakage from blind plug. Replace.
Decreased oil pressure Lack of oil in engine oil pan. Correct.
Dirty oil strainer. Clean or replace.
Damaged or worn pump rotors. Replace.
Malfunctioning regulator. Replace.
Use of poor quality engine oil. Replace.
Warning light remains “on” - engine
running
Decreased oil pressure. Previously mentioned.
Oil pressure switch unserviceable. Replace.
Electrical fault. Check circuit.
Noise Excessive backlash in pump gears. Replace.
LC-5
TROUBLE DIAGNOSES AND CORRECTIONS
Engine Cooling System
Condition Probable cause Corrective action
Water leakage Damaged radiator seams. Repair.
Water leakage from water pump shaft seal. Replace as pump assembly.
Water leakage from water temperature gauge. Tighten.
Loose joints. Tighten.
Damaged cylinder head gasket. Check engine oil for contamination.
Cracked cylinder block. Replace.
Check engine oil in crankcase for mixing with water
by pulling oil level gauge.
Cracked cylinder head. Replace.
Loose cylinder head bolts. Tighten.
Poor circulation Restriction in system. Check hoses for crimps, and clear the system of rust
and sludge by flushing radiator.
Insufficient coolant. Replenish.
Inoperative water pump. Replace.
Loose fan belt. Adjust.
Inoperative thermostat. Replace.
Corrosion Excessive impurity in water. Use soft, clean water (rain water is satisfactory).
Infrequent flushing and draining of system. Cooling system should be drained and flushed
thoroughly. Refer to ET section.
Overheating Faulty thermostat. Replace.
Radiator fin choked with mud, chaff, etc. Clean out air passage thoroughly by using
compressed air.
Incorrect ignition and valve timing. Adjust.
Dirty oil and sludge in engine. Flush engine and refill oil.
Inoperative water pump. Replace.
Loose fan belt. Adjust.
Restricted radiator. Flush radiator.
Inaccurate temperature gage. Replace.
Impurity in water. Use soft, clean water.
Overcooling Faulty thermostat. Replace.
Inaccurate temperature gauge. Replace.
Noise Squeak at water pump mechanical seal. Use suitable water pump seal lubricant.
Damaged or worn water pump bearing. Replace as pump assembly.
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Nissan 1D1 1D2 Series Forklift Internal Combustion & QD32 Gas/LPG K15 / K21 / K25 Engine Diesel Workshop Service Repair Manual D
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This is a comprehensive workshop service repair manual for the Nissan 1D1 1D2 Series Forklift Internal Combustion. It contains high-quality diagrams and instructions for servicing and repairing your Nissan Forklift, making it essential for both professional mechanics and DIY enthusiasts.
The manual includes service repair information for the Nissan Engine Gas/LPG K15, K21, K25, and the Nissan Engine Diesel QD32. It covers engine general, tune-up, mechanical, lubrication, cooling system, fuel, control, and electric aspects.
Additionally, it provides detailed information on general maintenance, engine removal, automatic transmission, differential carrier, drive axle, steering axle, wheel and tires, brake system, steering system, hydraulic system, loading mechanism, fuel and exhaust system, vehicle control system, body and frame, and body electric system.
This service repair manual is available in file formats compatible with all versions of Windows and Mac, as well as APP ISO, iPhone, iPod, Android, etc. The language used is English, and it requires Adobe Reader for access.
