Jeep Grand Cherokee

1993-1999 of release

Repair and operation of the car



Jeep Grand Cherokee
+ Cars of the Jeep Grand Cherokee brand
+ Settings and routine maintenance
+ Line six-cylinder engine
+ V8 engine
- Procedures of the general and capital repairs of the engine
   General information
   Capital repairs of the engine - the general information
   Check of compression pressure in cylinders
   The diagnostic checks made by means of the vacuum gage
   Methods of removal of the engine and necessary precautionary measures
   Removal and installation of the engine
   Options of restoration of the engine
   Order of dismantling of the engine
   Dismantling of a head of cylinders
   Cleaning and check of a condition of a head of cylinders
   Service of valves
   Assembly of a head of cylinders
   Removal of conrod and piston assemblies
   Removal of a bent shaft
   Cleaning of the block of the engine
   Check of a condition of the block of the engine
   Honingovaniye of cylinders
   Check of a condition of conrod and piston assemblies
   Check of a condition of a bent shaft
   Check of a condition of radical and conrod bearings
   Engine assembly order after completion of its capital repairs
   Installation of a bent shaft and check of gaps of radical bearings
   Installation of piston rings
   Installation of conrod and piston assemblies and check of gaps in conrod bearings
   The first start of the engine after capital repairs
+ Cooling systems, heating and air conditioning
+ A power supply system and production of the fulfilled gases
+ System of electric equipment of the engine
+ Systems of decrease in toxicity of the fulfilled gases and engine management
+ Manual box of gear shifting
+ Automatic transmission
+ Transfer case
+ Coupling and transmission line
+ Brake system
+ Suspension bracket and steering
+ Body
+ System of onboard electric equipment
+ Governing bodies and methods of operation



Procedures of the general and capital repairs of the engine

Specifications

4.0 l line 6-cylinder engine

General parameters

Working volume
4.0 l (4228 cm3)
Compression pressure in cylinders (kgf/cm2)
8,4 — 10,5
The maximum admissible distinction in compression pressure between cylinders (kgf/cm2)
2,1
Pressure of oil (kgf/cm2)
  • On idling turns (600 rpm)
0,9
  • With a frequency of rotation of the engine of 1600 rpm
2,6 — 5,3

Engine block

Diameter of cylinders (mm)
98,43 — 98,48
Admissible conicity and ovality (mm)
0,03
The maximum admissible not planeness of the surface interfaced to a head of cylinders
0,05 mm by 152,4 mm of length
Diameter of nests of pushers (mm)
23,000 — 23,025

Head of cylinders and valves

Maximum admissible not planeness of a head
0,05 mm by 152.4 mm of length
Minimum width of the cylindrical site (corbel) of plates of valves (mm)
0,79
Corner of a saddle of valves (inlet and final)
44,5 °
Corner of a working facet of plates of valves (inlet and final)
45 °
Diameter of cores of valves (mm)
7,90 — 7,92
Gap between a core of the valve and walls of the directing plug (mm)
0,025 — 0,076
Free length of a valvate spring (mm)
49,96
Adjusting height of a valvate spring (mm)
41,7
Length of the valve (mm)
  • Inlet
122,48 — 122,86
  • Final
122,86 — 123,24

Bent shaft and rods

Diameter of conrod necks (mm)
53,172 — 53,226
Gap in conrod bearings (mm)
  • Nominal
0,038 — 0,051
  • Admissible
0,025 — 0,076
Side gap (axial side play) of rods (mm)
0,25 — 0,48
Diameter of radical necks (mm)
63,490 — 63,503
Gap in radical bearings (mm)
  • Nominal
0,05
  • Admissible
0,025 — 0,064
Axial side play of a bent shaft (on the persistent bearing) (mm)
0,038 — 0,165
The maximum admissible conicity and ovality (for all necks) (mm)
0,013

Pistons and piston rings

Gap between the piston and walls of the cylinder (mm)
  • Nominal
0,033 — 0,038
  • Admissible
0,033 — 0,038
Gap in locks of piston rings (mm)
  • Compression rings
0,25 — 0,51
  • Oil scraper ring (steel sections)
0,25 — 0,64
Side gap of piston rings (mm)
  • Compression rings
    • Nominal
0,043
    • Admissible
0,043 — 0,081
  • Oil scraper ring
    • Nominal
0,076
    • Admissible
0,025 — 0,241

Efforts of tightening of threaded connections, N • m *

Bolts of covers of radical bearings

108

Nuts of covers of the lower heads of rods (conrod bearings)

45

* For more details see Specifications to the Head the Line six-cylinder engine.

V8 engine of 5.2 l

General parameters

Working volume
5.2 l (5211 cm3)
Compression pressure in cylinders (kgf/cm2)
8,4 — 10,5
The maximum admissible distinction in compression pressure between cylinders (kgf/cm2)
2,1
Pressure of oil (kgf/cm2)
On idling turns (600 rpm)
0,7
With a frequency of rotation of the engine of 3000 rpm
2,1 — 5,6

Engine block

Diameter of cylinders (mm)
99,31 — 99,42
Admissible conicity (mm)
0,25
Admissible ovality (mm)
0,13
The maximum admissible not planeness of the surface interfaced to a head of cylinders
0,05 mm by 152,4 mm of length
Diameter of nests of pushers (mm)
22,990 — 23,010

Head of cylinders and valves

Maximum admissible not planeness of a head
0,05 mm by 152.4 mm of length
Minimum width of the cylindrical site (corbel) of plates of valves (mm)
1,19
Corner of a saddle of valves (inlet and final)
44,25 — 44,75 °
Corner of a working facet of plates of valves (inlet and final)
43,25 — 43,75 °
Diameter of cores of valves (mm)
7,90 — 7,92
Gap between a core of the valve and walls of the directing plug (mm)
0,025 — 0,076
Free length of a valvate spring (mm)
49,96
Adjusting height of a valvate spring (mm)
41,7
Length of the valve (mm)
  • Inlet
124,28 — 124,92
  • Final
124,64 — 125,27

Bent shaft and rods

Diameter of conrod necks (mm)
53,95 — 53,98
Gap in conrod bearings (mm)
  • Nominal
0,01 — 0,06
  • Admissible
0,008
Side gap (axial side play) of rods (mm)
0,15 — 0,36
Diameter of radical necks (mm)
63,487 — 63,513
Gap in radical bearings (mm)
  • No. 1
0,01 — 0,04
  • No. No. 2, 3, 4 and 5
    • Nominal
0,01 — 0,05
    • Admissible
0,06 mm
Axial side play of a bent shaft (mm)
0,05 — 0,18
The maximum admissible conicity and ovality (for all necks) (mm)
0,025

Pistons and piston rings

Gap between the piston and walls of the cylinder (mm)
0,013 — 0,038
Gap in locks of piston rings (mm)
  • Compression rings
0,25 — 0,51
  • Oil scraper ring (steel sections)
0,25 — 1,27
Side gap of piston rings (mm)
  • Compression rings
0,038 — 0,076
  • Oil scraper ring
0,05 — 0,20

Efforts of tightening of threaded connections *, N • m

Bolts of covers of radical bearings

115

Nuts of covers of the lower heads of rods (conrod bearings)

61

* For more details see Specifications to the Head the V8 Engine.