General data for 4G1 and 4G13 engines
Type - 4G1 and 4G13
Working volume, cm3 — 1299
Cylinder diameter x stroke, mm - 71.0 x 82.0
Compression ratio - 10.0
Type of combustion chamber - tent type
Camshaft Location - Single Overhead Camshaft (SOHC)
Number of valves
- intake - 8
- graduation - 8
Valve timing
- intake valves
- opening - 17°to TDC
- closure - 39°after BDC
- exhaust valves
- opening - 49°to BDC
- closure - 7°after TDC
Rocker arm - roller type
Hydraulic valve clearance compensators
- 4G1 engine - not installed
- 4G13 engine - installed
Basic data for adjustments and monitoring of 4G1 and 4G13 engines
Generator drive belt tension
- when checking
- oscillation frequency, Hz - 150-184
- tension, N - 392-588
- deflection (set value), mm - 8.7-11.4
- when installing a used belt
- oscillation frequency, Hz — 159-176
- tension, N - 441-539
- deflection (set value), mm - 9.2-10.6
- when installing a new belt
- oscillation frequency, Hz — 191-218
- tension, N - 637-833
- deflection (set value), mm - 6.6-8.3
Power steering pump and air conditioning compressor drive belt tension
- when checking
- oscillation frequency, Hz - 137-168
- tension, N - 392-588
- deflection (set value), mm - 9.6-12.4
- when installing a used belt
- oscillation frequency, Hz - 145-160
- tension, N - 441-539
- deflection (set value), mm - 10.2-11.6
- when installing a new belt
- oscillation frequency, Hz - 174-199
- tension, N - 637-834
- deflection (set value), mm - 7.2-9.0
Valve clearance (on a hot engine), mm
- intake valves - 0.20
- exhaust valves - 0.30
Main ignition timing
- 4G1 engine — 5°±2°to TDC
- 4G13 engine — 5°±3°to TDC
Setting the ignition timing - 10°to TDC
Engine crankshaft idling speed, min-1 — 750±100
CO concentration, % — no more than 0.5
CH concentration, ppm — no more than 100
Compression (at 250-400 min-1), kPa
- nominal - 1598
- minimum allowable - 1161
Compression difference between cylinders, kPa - no more than 100
Vacuum in the intake manifold, kPa - at least 60
The length of the cylinder head bolt rod, mm - 103.2
General engine data 4G18
Type - 4G18
Working volume, cm3 — 1584
Cylinder diameter x piston stroke, mm - 76.0x87.3
Compression ratio - 10.0
Type of combustion chamber - tent type
Camshaft Location - Single Overhead Camshaft (SOHC)
Number of valves
- intake - 8
- graduation - 8
Valve timing
- inlet valves
- opening - 9°to TDC
- closure - 51°after BDC
- exhaust valves
- opening - 45°to BDC
- closure - 15°after TDC
Fuel system - distributed injection with electronic control
Rocker arm - roller type
Hydraulic valve clearance compensators - installed
Basic data for adjustments and control of the 4G18 engine
Engine crankshaft idling speed, min1 — 750±100
Compression (at 250-400 min1), kPa
- nominal - 1697
- minimum allowable -1226
Compression difference between cylinders, kPa - no more than 100
Sealant
Oil pan - MITSUBISHI GENUINE PART MD970389
General information
The 4G13 engine differs from the 4G1 engine in that a catalytic converter is installed in the exhaust manifold, hydraulic compensators are used to adjust valve clearances, and the intake manifold and ignition system are changed. The 4G18 engine differs from the 4G13 engine in that it has an increased working volume of up to 1584 cm3 and changed some adjustment data.