Jeep Grand Cherokee

1993-1999 of release

Repair and car operation



Jeep Grandee Cheroki
+ Jeep Grand Cherokee brand Cars
+ Settings and routine maintenance
- Ryadny six-cylinder engine
   General information
   The repair procedures, which performance it is possible without engine extraction from the car
   Reduction in the provision VMT of a step of compression of the piston of the first cylinder
   Removal and installation of a cover of a head of cylinders
   Removal, check of a condition and installation of yokes and bars of pushers
   Replacement of klapanny springs, their plates and maslootrazhatelny caps
   Removal and installation of the inlet pipeline / final collector
   Removal and installation of a head of cylinders
   Replacement of a forward epiploon of a cranked shaft
   Condition check, removal and installation of a cover of a distributive chain, chain and its asterisks
   Removal, check of a condition and installation of a camshaft, bearings and hydraulic pushers
   Removal and installation of the pallet of a case
   Removal, check of a condition and installation of the oil pump
   Removal and flywheel installation / driving disk
   Replacement of a back epiploon of the crankshaft
   Check of a condition and replacement of rubber pillows of support of the engine
+ V8 Engine
+ Procedures of the general and major maintenance of the engine
+ Systems of cooling, heating and air conditioning
+ the 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 operation receptions
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Removal, check of a condition and installation of a camshaft, bearings and hydraulic pushers

Measurement of height of working ledges (lifting) of cams of a camshaft

Check of height of working ledges of cams is made for the purpose of an assessment of degree of wear of a shaft and carried out before removal of a shaft from the engine. Uncover heads of cylinders (The section Removal and installation of a cover of a head of cylinders).

 PERFORMANCE ORDER

  1. Bring the piston of the first cylinder into the provision VMT of a step of compression (The section Reduction in the provision VMT of a step of compression of the piston of the first cylinder).
  2. Since the first cylinder, fix a tsiferblatny measuring instrument on the engine so that its plunzher appeared is coaxial to a bar of a pusher and rested against a yoke of the first piston.
  1. For check of height of lifting of a cam the tsiferblatny measuring instrument should be fixed directly over a pusher bar, and its plunzher - is coaxial to a bar.
  1. Null a measuring instrument and start to turn very slowly a camshaft in the normal direction until the arrow of the device will not stand on the maximum indication and will not start to fall back. The maximum indication of a measuring instrument corresponds to height of lifting of a cam.
  2. Write down the indication, then return the piston to the provision VMT of a step of compression.
  3. Establish a measuring instrument over a yoke of the second valve of the first cylinder and repeat procedure. Accurately write down results of all measurements.
  4. Repeat check for valves of the remained cylinders. As everyone their pistons during check should be in the provision VMT of a step of compression, pass from one of them to another simplest as ignition (see. Specifications).
  5. On termination of measurements compare all results to Specification requirements. If lifting of a cam appears less admissible value, the cam is worn-out and the camshaft is subject to replacement.

Camshaft removal

These models of cars are equipped with safety cushions. The pillow constantly is in readiness and can work to (be inflated) at any time at the connected battery. In order to avoid casual operation of system (and receiving as a result of a trauma) each time at work with safety cushion components (including sensors of blow which can be located near a lattice/bumper lobby) disconnect from the battery a negative wire. After shutdown of the battery before starting to work it is necessary to wait not less than 2 minutes (the system is equipped with the condenser of a delay which should be discharged completely). For more details see. Head System of onboard electric equipment.


Air central air constantly is under pressure. Do not weaken shtutserny connections of lines and do not disconnect systems any of components before carrying out its discharge. The coolant should be extorted from system in special compensatory and regenerative ERA-blok at station of dealer office or in a specialized workshop of car-care center. At a rassoyedineniye of lines of system surely put on goggles!


 PERFORMANCE ORDER

  1. If the car is equipped with air central air, make its discharge at station of dealer office or in a specialized workshop of car-care center. Disconnect a negative wire from the battery.
  2. Empty cooling system, remove a radiator, the fan and its casing (The head of System of cooling, heating and air conditioning).
  3. Remove a forward (radiatorny) lattice (Head the Body).
  4. On the models equipped with the conditioner of air remove the system condenser (The head of System of cooling, heating and air conditioning).
  5. Mark and disconnect from spark plugs candle wires.
  6. Remove the distributor (Head System of electric equipment of the engine).
  7. Remove a head of cylinders (The section Removal and installation of a head of cylinders).
  8. Remove hydraulic pushers and combine them in the organized order so that at assembly they could be established on the former places.
  1. By means of the magnetic tool (as is shown in a picture) or a special stripper take pushers.
  1. Remove a distributive chain with asterisks (The section condition Check, removal and installation of a cover of a distributive chain, a chain and its asterisks).
  2. Carefully take a camshaft. In quality to the handle in its end face the long bolt can be temporarily screwed in. In order to avoid damage of bearings at a prodevaniye of cams of a shaft through them, support a shaft the second hand.
  1. Slowly taking, support a camshaft the second hand as it is possible closer to a block wall - for convenience in an end face of a shaft can the long bolt is screwed in.

Condition check

 PERFORMANCE ORDER

  1. After the camshaft will be taken from the engine, it is necessary for washing out in solvent and to dry up, then to check necks of bearings on existence of cavities, traces of jamming and non-uniform wear. If necks are damaged, probably injured there will be also loose leaves of the corresponding bearings in the block. To replacement in this case are subject both a shaft, and loose leaves.
  2. If necks are found in a satisfactory condition, measure by a micrometer their diameters. Write down results of measurements. Measurement of diameter should be made in several points of each neck (both on length of a neck, and on its forming surface) is will help to reveal its ovality and a konusnost.
  3. Measure internal diameter of each of bearings by means of a telescopic nutromer and a micrometer. Subtract from diameters of bearings diameters of the corresponding necks. The result will correspond to size of gaps in bearings.
  4. Compare results of calculations to requirements of Specifications. If the gap of any of bearings exceeds admissible value, it is necessary to address in a car-care center workshop for replacement of bearings.
  5. Examine a driving gear wheel of the distributor on existence of signs of wear. In case of detection of those replace a camshaft.
  6. Check shaft cams on existence of traces of an overheat (sites with the changed coloring), задиров, chips, cavities and traces of non-uniform wear. If cams are found in a satisfactory condition, and results of measurements of height of their working ledges meet requirements of Specifications, the camshaft is subject to further use.
  7. Carrying out replacement of bearings of a camshaft demands use of special tools and existence of a certain experience, the poet lies outside the limits of qualification of the average amateur mechanic. Remove the engine and deliver the block for high-quality performance of procedure in a car-care center workshop.

If there are signs of a strong friction of a camshaft about a cover of a distributive chain, first of all check a condition of his persistent finger with a spring, then check passableness of openings of dumping of pressure of oil in a back neck of a shaft.

Installation

 PERFORMANCE ORDER

  1. Grease necks and cams and necks of a shaft with assembly impellent greasing.
  2. Insert a shaft into the engine. Try to support reliably a shaft in the course of installation in order to avoid damage of bearings at a prodevaniye of cams through them.
  3. Installation of the remained components make as it should be, the return to an order of their removal.

The camshaft and hydraulic pushers should correspond each other on nature of wear therefore in case of shaft replacement, in the obligatory it is necessary to replace and pushers.

  1. Before start of the engine replace impellent oil and the oil filter (Head of Control and routine maintenance).
  2. If during repair the camshaft and hydraulic pushers were established new, the engine should be warmed up to normal working temperature and is left working for some time (15-20 minutes) on turns of fast idling for extra earnings of components. After that it is necessary to replace oil and the oil filter again.