Removing
Note: Procedures for removing and installing the oil pan that need attention are given in the section "oil pan".
− Removal of parts is carried out in the order of numbers indicated in the figure "Removing the oil pump housing".
Removing the oil pump housing (4G15 engine). 1 - oil filter, 2 - gearbox mounting bracket, 3 - gearbox housing guard, 4 - drain plug, 5 - drain plug gasket, 6 - oil pan, 7 - oil receiver, 8 - oil receiver gasket, 9 - plug, 10 - pressure reducing valve spring, 11 - pressure reducing valve plunger, 12 - crankshaft front oil seal, 13 - oil pump housing, 14 - O-ring, 15 - oil pump cover, 16 - oil pump driven rotor, 17 - oil pump drive rotor.
− When removing parts, pay attention to the operation to remove the oil pump male and female rotors.
A) Loosen the bolts and remove the oil pump cover.
b) Before removing the oil pump, apply alignment marks regarding the position on the driving and driven rotors of the pump. This is necessary to ensure correct subsequent assembly.
Examination
Checking the oil pan and oil receiver
Checking procedures are given in section "oil pan".
Checking the oil filter seat
1. Check for damage to the contact surface of the oil filter.
2. Check for cracks or oil leaks.
Oil pump check
1. Check the teeth of the rotors for wear and damage.
2. Install the male and female rotors in the oil pump housing and check that they rotate smoothly without binding.
3. Checking the gaps of the oil pump rotors.
A) Check the clearance at the tops of the teeth of the pump rotors.
Clearance at the tops of the teeth of the rotors (nominal) — 0.06 - 0.18 mm
b) Check the end clearance of the pump's male and female rotors.
End clearance:
- nominal - 0.04 - 0.10 mm
- maximum allowable - 0.20 mm
V) Check the clearance between the outer surface of the driven rotor and the oil pump housing.
Gap between rotor and housing:
- nominal - 0.10 - 0.18 mm
- maximum allowable - 0.35 mm
G) If either gap is greater than maximum, replace both rotors. If necessary, replace the oil pump assembly.
Checking the pressure reducing valve
1. Check the ease of movement of the pressure reducing valve plunger in the oil pump housing.
2. Check the condition of the pressure reducing valve spring (no breakage, shrinkage).
Installation
− Installation of parts is carried out in the reverse order of removal.
− Pay attention to the following operations when installing parts.
Caution: When assembling, apply engine oil to all moving parts.
1. Installation of the leading and driven rotors of the oil pump.
A) Align the alignment marks and install the driven and main rotors in the oil pump housing.
b) Apply engine oil to the surfaces of the pump rotors.
V) Install the oil pump cover and tighten the mounting bolts.
2. Installing the oil pump housing
A) Remove any old sealant from the surface of the cylinder block (pump housing installation locations) and oil pump housing.
b) Apply the specified sealant in a continuous bead of 3 mm diameter to the oil pump housing at the locations shown in the illustration.
Sealant MITSUBISHI GENUINE Part No. MD970389, Three Bond No. 1207F or equivalent
Engine 4G15 (view from the cylinder block).
Engine 4G93 (view from the cylinder block).
V) Fix the oil pump housing to the cylinder block within 15 minutes after applying the sealant.
Attention: do not mix up the mounting bolts when installing the oil pump housing, as they differ in length.
Engine 4G15 (view from the timing belt).
Engine 4G93 (view from the timing belt).
4. Installing the front crankshaft oil seal.
A) Install the guide bushing on the front of the crankshaft and apply engine oil to the outer surface of the guide bushing.
Engine 4G15.
b) Apply engine oil to the lip of the oil seal and insert the oil seal along the guide bush until it contacts the oil pump housing.
V) Lightly tapping on the mandrel, install the oil seal flush with the oil pump housing.
Engine 4G15.
Engine 4G93.
5. Installing the oil pan.
The installation procedure is given in section "oil pan".
6. Installation of a drain plug and an oil filter is given in the corresponding section of the chapter "Maintenance and general inspection and adjustment procedures".