Jeep Grand Cherokee

1993-1999 of release

Repair and car operation



Jeep Grand Cherokee
+ Cars of mark Jeep Grand Cherokee
+ Options and routine maintenance
- Рядный the six-cylinder engine
   The general information
   The repair procedures, which performance it is possible without extraction of the engine from the car
   Reduction in position ВМТ 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 коромысел and bars of pushers
   Replacement клапанных springs, their plates and маслоотражательных caps
   Removal and installation of the inlet pipeline / a 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 pallet installation картера
   Removal, check of a condition and installation of the oil pump
   Removal and installation of a flywheel/privodnogo of a disk
   Replacement of a back epiploon коленвала
   Check of a condition and replacement of rubber pillows of support of the engine
+ Engine V8
+ Procedure of the general and engine major repairs
+ Systems of cooling, heating and air conditioning
+ The power supply system and release of the fulfilled gases
+ System of an electric equipment of the engine
+ Systems of decrease in toxicity of the fulfilled gases and engine management
+ Manual box of a gear change
+ Automatic transmission
+ Distributing box
+ Coupling and трансмиссионная a line
+ Brake system
+ Suspension bracket and steering
+ Body
+ System of an onboard electric equipment
+ Controls and operation receptions




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 estimation of degree of deterioration of a shaft and carried out before removal of a shaft from the engine. Uncover heads of cylinders (Has undressed Removal and installation of a cover of a head of cylinders).

 PERFORMANCE ORDER

  1. Result the piston of the first cylinder in position ВМТ of a step of compression (Has undressed Reduction in position ВМТ of a step of compression of the piston of the first cylinder).
  2. Since the first cylinder, fix циферблатный a measuring instrument on the engine so that it плунжер it has appeared it is coaxial to a bar of a pusher and rested in коромысло the first piston.
  1. For check of height of lifting of a cam циферблатный the measuring instrument should be fixed directly over a pusher bar, and it плунжер - is coaxial to a bar.
  1. Null a measuring instrument and start to turn very slowly a camshaft in a 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 in position ВМТ of a step of compression.
  3. Establish a measuring instrument over коромыслом 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 position ВМТ of a step of compression, pass from one of them to another most easier as ignition (Specifications see).
  5. On termination of measurements compare all results to Specification requirements. If cam lifting appears less than admissible value, the cam is worn out also a camshaft is subject to replacement.

Camshaft removal

The given models of cars are equipped by safety pillows. The pillow constantly is in readiness and can work to (be inflated) at any moment at the connected battery. In order to avoid casual operation of system (and receptions as a result of a trauma) each time at work with components of a pillow of safety (including gauges of blow which can be located near to a forward lattice/bumper) disconnect from the battery a negative wire. After battery switching-off before starting to work it is necessary to wait not less than 2 minutes (the system is equipped by the condenser of a delay which should be discharged completely). The Head the System of an onboard electric equipment more in detail see.


Air central air constantly is under pressure. Do not weaken штуцерные connection of lines and do not disconnect systems any of components before carrying out of its discharge. The coolant should be extorted from system in the special compensatory-regenerative ERA-BLOCK at station of dealer branch or in a specialised workshop of car-care centre. At рассоединении system lines necessarily put on goggles!


 PERFORMANCE ORDER

  1. If the car is equipped by air central air, make its discharge at station of dealer branch or in a specialised workshop of car-care centre. 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 an air conditioning).
  3. Remove forward (радиаторную) a lattice (the 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 an air conditioning).
  5. Mark and disconnect from spark plugs candle wires.
  6. Remove the distributor (the Head System of an electric equipment of the engine).
  7. Remove a head of cylinders (Has undressed Removal and installation of a head of cylinders).
  8. Remove hydraulic pushers and combine them in the organised order so that at assemblage 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 (Section condition Check, removal and installation of a cover of a distributive chain, a chain and its asterisks).
  2. Cautiously 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 продевании through them of shaft cams, support a shaft the second hand.
  1. Slowly taking, support a camshaft the second hand as it is possible more close to a block wall - for convenience in a shaft end face 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 up necks of bearings on presence of cavities, traces of jamming and non-uniform deterioration. If necks are damaged, probably damaged there will be also loose leaves of 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 конусность.
  3. Measure internal diameter of each of bearings by means of telescopic нутромера and a micrometer. Subtract from diameters of bearings diameters of corresponding necks. The result will correspond to size of backlashes in bearings.
  4. Compare results of calculations to requirements of Specifications. If the backlash of any of bearings exceeds admissible value, it is necessary to address in a workshop of car-care centre for replacement of bearings.
  5. Examine приводную a distributor gear wheel on presence of signs of deterioration. In case of detection of those replace a camshaft.
  6. Check up shaft cams on presence of traces of an overheat (sites with the changed colouring), задиров, having chopped off, cavities and traces of non-uniform deterioration. 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 the further use.
  7. Carrying out of replacement of bearings of a camshaft demands use of special tools and certain experience presence, the poet lies out of limits of qualification of the average mechanic-fan. Remove the engine and deliver the block for qualitative performance of procedure in a car-care centre workshop.

If there are signs of a strong friction of a camshaft about a cover of a distributive chain, first of all check up a condition of its persistent finger with a spring, then check up passableness of apertures of dump 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 продевании through them of cams.
  3. Installation of the remained components make in an order, the return to an order of their removal.

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

  1. Before engine start replace impellent oil and the oil filter (the Head of Adjustment and routine maintenance).
  2. If during repair the camshaft and hydraulic pushers have been established new, the engine should be разогрет to normal working temperature and is left working during 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.