Contents: General data of engines 4G1 and 4G13 ⤓ Basic data for adjustments and…⤓ General data of the 4G18 engine ⤓ Basic data for adjustments and…⤓ Sealant ⤓ General information ⤓
General data of engines 4G1 and 4G13
Type - 4G1 and 4G13
Working volume, cm³ — 1299
Cylinder diameter x piston stroke, mm — 71.0 x 82.0
Compression ratio - 10.0
Combustion chamber type - tent type
Camshaft arrangement - single overhead camshaft (SOHC)
Number of valves
- inlet - 8
- graduations - 8
Valve timing
- intake valves
- opening - 17° before TDC
- closure - 39° after BDC
- exhaust valves
- opening - 49° before BDC
- closing - 7° after TDC
Valve rocker arm - roller type
Hydraulic valve clearance compensators
- 4G1 engine - not installed
- engine 4G13 - 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 (specified value), mm — 8.7-11.4
- when installing a previously used belt
- oscillation frequency, Hz — 159-176
- tension, N — 441-539
- deflection (specified value), mm — 9.2-10.6
- when installing a new belt
- oscillation frequency, Hz — 191-218
- tension, N — 637-833
- deflection (specified 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 (specified value), mm — 9.6-12.4
- when installing a previously used belt
- oscillation frequency, Hz — 145-160
- tension, N — 441-539
- deflection (specified value), mm — 10.2-11.6
- when installing a new belt
- oscillation frequency, Hz — 174-199
- tension, N — 637-834
- deflection (specified value), mm — 7.2-9.0
Valve clearance (on hot engine), mm
- intake valves - 0.20
- exhaust valves - 0.30
Main ignition timing angle
- 4G1 engine - 5°±2° before TDC
- engine 4G13 — 5°±3° before TDC
Setting the ignition timing angle - 10° before TDC
Engine crankshaft speed at idle, min⁻¹ — 750±100
CO concentration, % — no more than 0.5
Concentration of CH, ppm — no more than 100
Compression (at 250-400 min⁻¹), kPa
- nominal - 1598
- minimum allowed - 1161
Compression difference between cylinders, kPa — no more than 100
Vacuum in the intake manifold, kPa — minimum 60
Length of cylinder head bolt rod, mm — 103.2
General data of the 4G18 engine
Type - 4G18
Working volume, cm³ — 1584
Cylinder diameter x piston stroke, mm — 76.0x87.3
Compression ratio - 10.0
Combustion chamber type - tent type
Camshaft arrangement - single overhead camshaft (SOHC)
Number of valves
- inlet - 8
- graduations - 8
Valve timing
- intake valves
- opening - 9° before TDC
- closing - 51° after BDC
- exhaust valves
- opening - 45° before BDC
- closing - 15° after TDC
Fuel system - distributed injection with electronic control
Valve rocker arm - roller type
Hydraulic valve clearance compensators - installed
Basic data for adjustments and monitoring of the 4G18 engine
Engine crankshaft speed at idle, min¹ — 750±100
Compression (at 250-400 min¹), kPa
- nominal - 1697
- minimum allowed -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 modified. The 4G18 engine differs from the 4G13 engine in that its working volume has been increased to 1584 cm³ and some adjustment data have been changed.