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REPAIR MAINTENANCE OPERATION OF MOTOR VEHICLES
Jeep Grand Cherokee (from 1993 to 1999, the year of issue)

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Jeep Grand Cherokee
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Jeep
Grand Cherokee
Introduction
Adjustment and routine maintenance
The straight six-cylinder engine
The V8 engine
Procedure of the general and engine major repairs
general information
Overhaul of the engine - the general information
Check the compression pressure in the cylinders
Diagnostic Tests produced using gauge
Methods for removal of the engine and the necessary precautions
Removing and installing engine
Recovery Options Engine
An order of dismantling of the engine
Dismantling of a head of cylinders
Cleaning and checking the status of a head of cylinders
Service valves
Assembling the cylinder head
Removing the connecting rod and piston assembly
Removing the crankshaft
Cleaning the engine block
Checking the engine block
Honing cylinders
Checking the connecting rod and piston assembly
Checking the status of the crankshaft
:20. Checking the main and connecting rod bearings
The order of assembly of the engine after completing its overhaul
Installation of a cranked shaft and check of backlashes of radical bearings
Installation of the piston rings
Installing the connecting rod and piston assembly and check of backlashes in the connecting rod bearing
The first start of the engine after major repairs
Systems of cooling, heating and air conditioning
The power supply system and exhaust
The system of electric motor
Systems of decrease in toxicity of the fulfilled gases and engine management
Manual box of a gear change
Automatic Transmission
Transfer Case
Clutch and transmission line
Brakes
Suspension and steering
Body
The system of on-board electrical equipment
Controls and operation receptions
 


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Procedure of the general and engine major repairs



Specifications

Line 6-cylinder engine of 4.0 liters

Common parameters

Displacement
4.0 liters (4228 cm 3)
Compression cylinder pressure (kgf / cm 2)
8.4 - 10.5
The maximum allowable difference in compression pressure between cylinders (kgf / cm 2)
2.1
Oil pressure (kgf / cm 2)
  • At idle (600 rev / min)
0.9
  • When engine speed 1600 rev / min
2.6 - 5.3

Engine block

Bore (mm)
98.43 - 98.48
Permissible taper and roundness (mm)
0.03
The maximum permissible flatness of the mating surface with the cylinder head
0.05 mm to 152.4 mm in length
The diameter of the nests of pushers (mm)
23.000 - 23.025

Cylinder Head and Valves

The maximum permissible flatness head
0.05 mm to 152.4 mm in length
The minimum width of the cylindrical portion (girdle) valve plates (mm)
0.79
Angle seat valves (intake and exhaust)
44,5 ?
Corner of a working facet of the valve plates (intake and exhaust)
45 ?
The diameter of the valve stem (mm)
7.90 - 7.92
The clearance between the valve stem and the wall of the guide sleeve (mm)
0,025 - 0,076
Free length of the valve spring (mm)
49.96
Installation height of the valve spring (mm)
41.7
Valve length (mm)
  • Intake
122.48 - 122.86
  • Graduation
122.86 - 123.24

The crankshaft and connecting rods

The diameter of crankpins (mm)
53.172 - 53.226
Connecting rod bearing clearance (mm)
  • Nominal
0,038 - 0,051
  • Permissible
0,025 - 0,076
Side clearance (axial clearance) of rods (mm)
0.25 - 0.48
The diameter of the main journals (mm)
63.490 - 63.503
Backlash in radical bearings (mm)
  • Nominal
0.05
  • Permissible
0.025 - 0.064
Crankshaft end play (for thrust bearing) (mm)
0,038 - 0,165
The maximum permissible taper and roundness (for all necks) (mm)
0,013

Pistons and piston rings

The clearance between the piston and the cylinder wall (mm)
  • Nominal
0,033 - 0,038
  • Permissible
0,033 - 0,038
The gap piston ring (mm)
  • Compression rings
0.25 - 0.51
  • Scraper ring (steel section)
0.25 - 0.64
Backlash piston rings (mm)
  • Compression rings
    • Nominal
0,043
    • Permissible
0,043 - 0,081
  • Scraper ring
    • Nominal
0,076
    • Permissible
0.025 - 0.241

Efforts of a tightening of carving connections, N ??? m *

Bolts main bearing caps

108

Nuts caps bottom heads of rods (rod bearing)

45

* See. Specifications to the Head straight six-cylinder engine.

The V8 engine capacity of 5.2 liters

Common parameters

Displacement
5.2 liters (5211 cm 3)
Compression cylinder pressure (kgf / cm 2)
8.4 - 10.5
The maximum allowable difference in compression pressure between cylinders (kgf / cm 2)
2.1
Oil pressure (kgf / cm 2)
At idle (600 rev / min)
0.7
At an engine speed of 3000 rev / min
2.1 - 5.6

Engine block

Bore (mm)
99.31 - 99.42
Permissible taper (mm)
0.25
Permitted roundness (mm)
0.13
The maximum permissible flatness of the mating surface with the cylinder head
0.05 mm to 152.4 mm in length
The diameter of the nests of pushers (mm)
22.990 - 23.010

Cylinder Head and Valves

The maximum permissible flatness head
0.05 mm to 152.4 mm in length
The minimum width of the cylindrical portion (girdle) valve plates (mm)
1.19
Angle seat valves (intake and exhaust)
44,25 - 44,75 ?
Corner of a working facet of the valve plates (intake and exhaust)
43,25 - 43,75 ?
The diameter of the valve stem (mm)
7.90 - 7.92
The clearance between the valve stem and the wall of the guide sleeve (mm)
0,025 - 0,076
Free length of the valve spring (mm)
49.96
Installation height of the valve spring (mm)
41.7
Valve length (mm)
  • Intake
124.28 - 124.92
  • Graduation
124.64 - 125.27

The crankshaft and connecting rods

The diameter of crankpins (mm)
53.95 - 53.98
Connecting rod bearing clearance (mm)
  • Nominal
0.01 - 0.06
  • Permissible
0,008
Side clearance (axial clearance) of rods (mm)
0.15 - 0.36
The diameter of the main journals (mm)
63.487 - 63.513
Backlash in radical bearings (mm)
  • Number 1
0.01 - 0.04
  • ?? 2, 3, 4 and 5
    • Nominal
0.01 - 0.05
    • Permissible
0.06mm
Axial clearance of the crankshaft (mm)
0.05 - 0.18
The maximum permissible taper and roundness (for all necks) (mm)
0,025

Pistons and piston rings

The clearance between the piston and the cylinder wall (mm)
0,013 - 0,038
The gap piston ring (mm)
  • Compression rings
0.25 - 0.51
  • Scraper ring (steel section)
0.25 - 1.27
Backlash piston rings (mm)
  • Compression rings
0,038 - 0,076
  • Scraper ring
0.05 - 0.20

Efforts of a tightening of carving connections * N ??? m

Bolts main bearing caps

115

Nuts caps bottom heads of rods (rod bearing)

61

* For details, see. Chapter Specifications Engine V8.





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