Dismantling, check of technical condition, repair and assembly of cylinder head tsilindrova

Install the cylinder head on the stand. Put labels on the recorded parts to install them correctly in the assembly. Remove the intake manifold with the fuel line. Disconnect from a head pipe EGR. Remove the exhaust manifold after removing the insulating screen. Remove the shims and the tappets. Remove the valve using spring compressor type Facom U43LA and place for each valve separately crackers, spring plate, thrust washer. Clean all parts. Remove from the oil wiper guides caps. In order to remove the remains of the gasket with parts made of aluminum alloy, it is possible to use a scraper or other sharp instrument. However, proceed with caution, as it may cause damage to the mating surfaces. It is preferred to use for this purpose a chemical solvent such as Loctite - Decaploc 88 or Decapjoint.

Repair of the cylinder head requires special equipment, so it is advisable to hold it in repair shops.

Inspect the removed parts, check for cracks, chips, a significant deterioration of the working surface, and other defects. Here's how to check the technical condition of the main parts of the cylinder head.

Valve guides

Pressed into the cylinder head (Fig. 2.31). There reconstruction outer sleeve with increased inner diameter and reduced. Pulling out the worn bushings carried by the press and the mandrel.

Pre-heat the head in an oil bath to a temperature of 110-120 ?� C. Then chisel bushing hole oversize. Pressing bushings are also held in the head after being heated to a specified temperature, and then expand the internal bore diameter of a crimped sleeve valve stem.

Valves

The gap between the valve stem and guide bushing must not exceed the permissible value. Since valves repair sizes are not provided, replace the valve and the plug should be paired. A valve head and lapping grind only within the dimensions specified in Table. 2.6. After grinding chamfers thoroughly clean the cylinder head and check the tightness of the valve. The geometrical dimensions of the valve are shown on Fig. 2.32.

Valve seats

Pressed into the cylinder head. Saddles sandable within the dimensions specified in Table. 2.5. Replacing seats is carried out after heating the cylinder head in an oil bath to a temperature of 110-120 ?� C using a press and mandrel. After grinding chamfers thoroughly clean the cylinder head and check the tightness of the seats. The geometrical dimensions of the seats are shown in Fig. 2.33.

Table 2.5 Dimensional characteristics of the valve seats and the engines GA14DE GA16DE

Valve stem seals

Always replace the repair head. Replace them after removing the support washers valves using tool.

Valve springs

Check the angle of deflection from the axis of the spring coils. When chipping protective varnish is recommended to replace the spring because of the possibility of the spring break during operation. Do not clean the spring using gasoline or trichlorethylene, as these substances can dissolve the protective lacquer.

Pushers

Check the condition of the surface and the gap between the pushers and the walls of their nests. Inspect the surface of the nests of pushers. In the case of wear exceeding the allowable replace pushers or cylinder head.

Mating surface with the cylinder block head

If the deviation from flatness of the interface of the cylinder head with a block greater than 0.1 mm, and the camshaft rotates freely, perform grinding cylinder head. The thickness of the release layer of the metal should not exceed 0.2 mm. Otherwise, replace the cylinder head.

Camshaft and sprocket

Inspect the surface of the camshaft and bearings, paying particular attention to the wear of cams and necks. Check out their geometric dimensions. With a significant deviation of the measured values of permissible shaft or replace the cylinder head. Check radial and axial run-out of shafts and sprockets. Replace parts with considerable wear.

When assembling the cylinder head must be lubricated with engine oil quality recommended all the contact details. When work is guided by Fig. 2.34.

Clean the cylinder head and all the removed parts. Blow channels of the cylinder head, paying particular attention to the lubrication channels camshafts. When using the previously removed valve set them into place.

The assembly of the valve mechanism follow in that order. Insert the valve into directing plug, pull on the guide sleeve thrust washer, press them a new valve stem seal, place the spring and spring plate. Squeeze the tool spring and establish crackers. Put on the edge of the cylinder head and lightly tapping copper or bronze hammer on the edges of the valve stem until you get the correct fit of crackers. Set into place tappets with shims. Install the exhaust manifold with new gaskets, then thermal insulating screen. Install the intake manifold with a new gasket. Install the EGR conduit between the intake manifold and the exhaust manifold.