engines
The engine of a car is the engine that drives a car.
The main dimensions of the connecting rod and piston group are shown in Figure 1.
The piston is cast aluminum. The mass of the pistons is strictly maintained in the manufacture.
We discussed the removal of the cylinder head in article. In this article, we will look at the disassembly and assembly of the cylinder head.
After removing the cylinder head, we disassemble it and defect.
Figure 1 shows a diagram of the Cummins ISF3.8 engine control system of the Valdai car
The system of gas turbine supercharging and charge air cooling, by using part of the energy of the exhaust gases, provides the supply of pre-compressed and cooled air to the engine cylinders
Diesel model D-245.7EZ is installed on PAZ-32053-07 buses.
Diesel model D-245.9EZ is installed on buses PAZ-4234 and PAZ-32053-07
The general view and cross section of the engines are shown in the figures.
The engines are inline four-cylinder, equipped with carburetors and a contactless ignition system
If a malfunction occurs during the operation of the bus (lighting up, flashing the diagnostic lamp of the "COMMON RAIL" system), it is necessary to diagnose the "COMMON RAIL" system using the diagnostic lamp and the diagnostic key and eliminate the identified malfunctions
The timing chain tensioner is located on the right side of the engine above the coolant pump.
Oil is supplied to the hydraulic tensioner through a seamless steel tube with a diameter of 6 mm with tips.
We examined the engine disassembly in the article - Engine disassembly.
In this article, we will consider the defect detection of parts and the preparation of the main parts for assembly.
The piston pin is installed with tension in the upper head of the connecting rod and rotates freely in the piston bosses.
The engines are equipped with SMP pistons.
In Figure 1 we present a diagram of the PAZ 4234-05 Cummins ISF3.8 e3168 electronic engine control system without SCR
After disassembling the block head, rinse all parts in gasoline, wipe and dry.
Clean the combustion chambers from soot.
Inspect the block head. If there are cracks on the jumpers between the valve seats or on the walls of the combustion chambers, traces of burnout, replace the block head.
We replace the camshaft seals when repairing the cylinder head and when oil leaks from under the seal
The engine cylinder block is cast from cast iron
The casting is subjected to artificial aging to relieve thermal stress, which allows the block to retain the correct geometric shapes and dimensions during operation
We remove the engine flywheel when overhauling the engine or to replace the crown.
Preparing the car for the task. Disconnect the negative battery terminal.
The drive of the gas distribution mechanism of the VAZ-2123 engine consists of sprockets, a chain, a shoe, a damper and a hydraulic chain tensioner.
The engine chain is single-link, unlike the engines of previous models.
