5 

FE01-2018b

 

GT301-013 

Tool for installing 
front oil seal of 
crankshaft 

6 

FE01-2019b

 

GT301-015 

Crankshaft Rear Oil 
Seal Installation Tool 

7 

FE01-2020b

 

GT301-016 

Tool for installing and 
removing piston pin 

8 

FE01-2021b

 

GT301-018 

Tool for locating 
camshaft 

9 

FE01-2022b

 

GT301-020 

Tool for locating 
crankshaft belt disc 

1059

10 

FE01-2023b

 

GT301-021 

Tool for tightening 
flywheel 

11 

FE01-2024b

 

GT301-022 

Tool for tightening 
timing chain 

1060

2.14 Lubrication system (4G18) 

2.14.1 Specifications 

2.14.1.1 Fastener Tightening Specification 

Torque Range 

Fastener Name 

Model 

Metric (N.m) 

English system 
(lbf-ft) 

Connecting bolt of oil pan and 
cylinder body 

M6 8-10 

6-7 

. 

4 

Connecting Bolts Between Oil 
Strainer and Cylinder Block 

M6 8-10 

6-7 

. 

4 

Oil Sensor Plug and Cylinder Block 
Connecting Bolts 

R 1/8 

11.5-19.5 

8.6-14.4 

Oil Filter and Cylinder Pipe Adapter 

UNF3/4″－16 16-24 

11.8-17.8 

Oil Filter Adapter 

M28×1.5 

33-37 

24.4-27.4 

Oil Pump Mounting Bolt 

M6 

8-10 

6-7 . 4 

Oil drain plug of oil pan 

M12 

25-35 

18.5-25.9 

 

2.14.1.2 Oil Pump Specification 

Side Clearance 

0.0250-0.062mm (0.0010-0.0024in) 

Tooth Clearance 

0.0300-0.099mm (0.00120-0.0039in) 

Engine oil pressure induction plug 
lightening pressure 

≤40kPa(≤6psi) 

Oil Pump Output Pressure 0.6MPa(87psi) 

Oil Pump Relief Valve Opening Pressure 

0.42-0.58MPa(61～85psi) 

 

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2.14.2 Description and Operation 

2.14.2.1 Operated and description 

Oil Pan 

The engine sump is installed at the bottom of the crankcase; engine oil is extracted by the oil 
pump from the oil sump; after passing through the oil filter, the engine oil lubricates the cylinder 
body and cover respectively through two oil passages; the engine oil flows to the connecting rod 
through the engine oil passage in the crankshaft, then to the piston and cylinder, and returns to the 
oil sump finally. In the second oil path, the engine oil passes through the engine oil passage to the 
camshaft, and also passes through the internal oil passage of the camshaft to lubricate the valve 
assembly and returns to the oil sump finally. 

Oil Pump 

Oil pump draws the engine oil from the oil pan and then pump the engine oil with pressure to the 
various parts of the engine. Oil pump inlet has an oil filter - set filter. Set filter blockage may 
damage the oil pump and cause the pump oil inoperative, and the lubricating system will be 
unable to establish a normal oil pressure, which will cause the engine mechanical damage. Oil 
pump is driven by the crankshaft concave. As long as the crankshaft rotates, the oil pump will be 
working. The oil pump displacement is fixed, so when the engine speed is high, the oil pump 
output pressure will exceed the needs of the engine lubrication system. There is a safety valve in 
the oil pump assembly. The safety pressure relief valve cavity is connected with the oil pump 
intake chamber. When the output pressure exceeds 0.5 MPa (73 psi), the security valve is open, 
the excess oil returns to the oil pump through the valve. With the normal oil supply, the safety 
valve bypass is closed. 

Lubrication Descriptions 

The oil filter stand is integrated on the crankcase body. The engine oil flows through the engine oil 
filter core through the lower oil passage of the engine oil filter seat upward. After being filtered, 
engine oil passes through the oil filter seat upper oil path to return to the cylinder block. Engine oil 
passes through the oil path to the cylinder block front. The engine oil is supplied to various 
cylinder heads, main shaft oil path, VVT electromagnetic valve and camshaft position actuator 
through these front oil paths. 

Each cylinder head oil passage introduces the engine oil into the cylinder head and the camshaft 
bearing journal. Engine oil passes through the main oil path to the VVT solenoid valve, VVT 
solenoid valve oil cavity, to the VVT actuator. The VVT solenoid valve is used for controlling the 
intake camshaft position actuator and the engine control module (ECM) controls the VVT 
solenoid valve. When the engine control module provides power to the VVT solenoid valve, the 
solenoid valve guides the engine oil to flow through the cylinder hood cover camshaft front 
bearing caps. Engine oil passes through the intake camshaft bearing caps into the camshaft journal 
drilled hole and flows to the intake camshaft front installation surface. Then, the engine oil flows 
to the camshaft position actuator corresponding oil path. VVT solenoid valve guides engine oil 
into the system corresponding oil path, so that the engine oil pressure acting on the intake 
camshaft position actuator internal blades. The intake camshaft (installed on the camshaft position 
actuator inner rotor) rotates relative to the sprocket (mounted on the intake camshaft position 
actuator housing). At idle, the internal pin will lock the rotor to the intake camshaft actuator 
housing. When starting, the cam actuator position will maintain the original position or the default 
position. VVT solenoid valve guides engine oil hydraulic pressure to loosen the lock pin, so that 
the intake camshaft position actuator works. Oil pump contains a small engine oil nozzle, which 
sprays the engine oil to timing chain components. Engine oil passes through the camshaft timing 
chain drive belt area or cylinder hood cover and cylinder block casting oil return path and returns 
to the oil pan. 

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