Jeep Grand Cherokee

 PERFORMANCE ORDER

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. Write down the indication, then return the piston in position ВМТ of a step of compression. Establish a measuring instrument over коромыслом the second valve of the first cylinder and repeat procedure. Accurately write down results of all measurements. 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). 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.

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. Empty cooling system, remove a radiator, the fan and its casing (the Head of System of cooling, heating and an air conditioning). Remove forward (радиаторную) a lattice (the Head the Body). On the models equipped with the conditioner of air remove the system condenser (the Head of System of cooling, heating and an air conditioning). Mark and disconnect from spark plugs candle wires. Remove the distributor (the Head System of an electric equipment of the engine). Remove a head of cylinders (Has undressed Removal and installation of a head of cylinders). Remove hydraulic pushers and combine them in the organised order so that at assemblage they could be established on the former places.

Remove a distributive chain with asterisks (Section condition Check, removal and installation of a cover of a distributive chain, a chain and its asterisks). 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.

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. 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. 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. 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. Examine приводную a distributor gear wheel on presence of signs of deterioration. In case of detection of those replace a camshaft. 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. 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.

Grease necks and cams and necks of a shaft with assembly impellent greasing. 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. Installation of the remained components make in an order, the return to an order of their removal.

Before engine start replace impellent oil and the oil filter (the Head of Adjustment and routine maintenance). 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.