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
+ Engine V8
- Procedure of the general and engine major repairs
   The general information
   Engine major repairs - the general information
   Check компрессионного pressure in cylinders
   The diagnostic checks made by means of the vacuum gauge
   Methods of removal of the engine and necessary safety measures
   Removal and engine installation
   Variants 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
   Assemblage of a head of cylinders
   Removal of shatunno-piston assemblages
   Removal of a cranked shaft
   Cleaning of the block of the engine
   Check of a condition of the block of the engine
   Хонингование cylinders
   Check of a condition of shatunno-piston assemblages
   Check of a condition of a cranked shaft
   Check of a condition radical and шатунных bearings
   Assembly order of the engine after end of its major repairs
   Installation of a cranked shaft and check of backlashes of radical bearings
   Installation of piston rings
   Installation of shatunno-piston assemblages and check of backlashes in шатунных bearings
   The first start of the engine after 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


Installation of shatunno-piston assemblages and check of backlashes in шатунных bearings

Before installation of shatunno-piston assemblages of a wall of cylinders should be carefully cleaned, the facet, and a cranked shaft is removed from an upper edge of cylinders - is established in the engine.

Uncover the first (№ 1) a rod (the labels made in the course of dismantle) see. Take old loose leaves and wipe подшипниковые surfaces in a rod and a cover pure неворсящейся rags - they should be absolutely pure.

Backlash measurement in шатунных bearings


    Wipe a back top of new loose leaves and will put it to bed the bearing in a rod head. Track that the loose leaf uvula has entered into reciprocal deepening in a rod. Do not try to begin to knock at all the loose leaf in bed a hammer and try not to damage подшипниковую a surface, having left on it of an agnail and teases. Greasing at the given stage should not to be made! Wipe a back of the second loose leaf and insert it into a rod cover. Again make sure of uvula hit in reciprocal deepening. Do not grease the loose leaf. It is extremely important, that at the given stage interfaced surfaces of loose leaves and from beds were absolutely pure and dry. Arrange locks of rings on the piston how it is shown on an accompanying illustration.
    Before installation in the engine of shatunno-piston assemblage place locks of piston rings how it is shown in drawing.
    Pull pieces of a polyethylene or rubber hose on bolts of fastening of a cover шатунного the bearing. Grease pistons and piston rings with pure impellent oil and put on the piston оправку the tool for сжимания piston rings. Leave a skirt of the piston acting of оправки on height approximately 6.4 mm for piston introduction in the cylinder. Rings should be compressed so that they have appeared заподлицо with a piston surface. Turn a cranked shaft so that the first шатунная a neck has appeared in position НМТ and grease cylinder walls with impellent oil. Having focused the piston so that the marksman (or deepening) on its bottom it has appeared turned forward on the engine, cautiously enter shatunno-piston assemblage in the first cylinder, having rested a bottom edge оправки the tool for compression of piston rings against a block surface.

Deepening on the piston bottom should be turned forward on the engine.

    Обстучите an upper edge оправки the tool for a guarantee of dense pressing of its bottom edge to the block on all perimetre. Start to tap cautiously on the bottom of the piston with the wooden handle of a hammer, simultaneously directing the bottom head of a rod on a shaft neck. Piston rings tend to выскакиванию from оправки the tool before the calling in the cylinder, therefore provide a constant reliable clip оправки to the block. Work without hurrying up and at first signs of occurrence of resistance immediately stop assemblage introduction in the cylinder. Find out the reason of jamming and eliminate it before starting continuation of performance of procedure. Do not try to insert at all the rested piston into the cylinder force is it is fraught with damage of rings and-or the piston! After assemblage installation before finalising a cover шатунного the bearing, it is necessary to make backlash measurement in it. Cut off a piece of the calibrated wire from measuring set Plastigage, in the length width шатунного are hardly shorter than the bearing and lay a piece on шатунную a shaft neck, in parallel its axis.
    Lay a piece of the calibrated plastic wire from measuring set Plastigage in parallel a neck axis.
    Wipe подшипниковую a surface of a cover of a rod, remove protective hoses from bolts and establish a cover. Track that the adjusting label on a cover has appeared the label on a rod is turned into the same party, as. Screw nuts and, in three stages, tighten them with demanded effort.

In order to avoid wrong indications динамометрического a key use a thin-walled replaceable head which will not jam between a nut and a cover surface. If nevertheless jamming has occurred, slightly raise a head, having liberated it and only then continue a tightening. Do not suppose проворачивания a cranked shaft in the course of a tightening of nuts of a cover шатунного the bearing.

    Give nuts and uncover, trying not to break integrity of the flattened out calibrated wire. Measure width of the flattened out wire on a scale printed on packing of a measuring set. The scale is marked already in sizes of a backlash of the bearing. Compare result of measurements to requirements of Specifications.
    Measure width of the flattened out calibrated wire for backlash definition in шатунном the bearing (track using a correct scale - on packing are printed both a metric scale, and a scale in terms of the American standard (inch)).
    If the backlash size does not meet requirements of Specifications, that, probably, loose leaves not that size (that means necessity of their replacement) are established. Before coming to the definitive conclusion about necessity of replacement of loose leaves, make sure that under their backs in the course of backlash measurement there was no dirt or oil. Besides, repeat measurement of diameter of a neck. If the flattened out calibrated wire is wider from one of the neck parties last has конусность and the shaft requires in проточке.

Definitive installation of a rod


    Cautiously scratch out traces of plastic of the flattened out wire from bearing and neck surfaces. Use a nail or a credit card edge. Make sure of irreproachable cleanliness подшипниковых surfaces, then in regular intervals grease with their thin layer молибденсодержащей or assembly impellent greasing. For providing of access to подшипниковой and the piston it is necessary to push surfaces of a head of a rod a little upwards on the cylinder - do not forget to put on bolts of fastening of a cover protective hoses. Put on a rod back a neck, remove protective hoses from bolts, put on bolts a cover and tighten nuts with demanded effort. A tightening besides make in three stages. Repeat all procedure (including backlash measurement) for the remained shatunno-piston assemblages. Important points about which it is not necessary to forget in no event, the following is:
      Beds of bearings in rods and covers, and also backs of loose leaves should be absolutely pure. In each of cylinders shatunno-piston assemblage corresponding to it should be established. Arrows (deepening) on the bottoms of pistons should specify forward on the engine. Locks of rings should be in the correct image сориентированы (see an illustration). Grease walls of cylinders with pure impellent oil. Do not forget to grease a surface of bearings at definitive installation of covers (after measurement of backlashes).
    After end of installation of all shatunno-piston assemblages some times turn a cranked shaft manually, checking it on absence of obvious signs of jamming. In summary check up axial люфт rods (Has undressed Removal of shatunno-piston assemblages). Compare results of measurement axial люфта to requirements of Specifications. If люфт corresponded to requirements before assemblage and the former shaft and rods have been established, люфт should remain in norm. In case of installation of a new shaft and rods the size люфта can leave for admissible limits. Then it is necessary to remove rods and to send them in a workshop of car-care centre for machining. Installation of the remained components continue in an order, the return to an order of their removal. The additional information it is necessary to search Heads of Rjadnyj for the six-cylinder engine (the 6-cylinder engine) and Engine V8 (engine V8).