Three engine versions are used to complete the Acura Integra models under consideration. All versions are among the engines with two overhead camshafts (DOHC). Each cylinder has 4 valves (16V).
The engines are equipped with one of two versions of the electronic system for adjusting the valve timing (VTEC). A more detailed description of the design and principle of operation of VTEC systems is devoted to VTEC Systems - General Information and Component Health Check.
The motors used have the following designations:
B18B1 | 1.8 l, 16V, DOHC |
B18C1 | 1.8 l, 16V, DOHC VTEC |
B18C5 | 1.8 l, 16V, DOHC VTEC |
The description of most of the procedures under consideration is based on the assumption that the power unit remains in its regular place in the engine compartment of the car. In view of the above, if the engine has already been removed and installed on a workbench or mounting stand, many of the described steps should be omitted.
The engine has a compact design, the main component of which is a cylinder block made of lightweight aluminum alloy. Steel cylinder liners are inserted into the holes machined in the block. An aluminum cylinder head is mounted on top of the block. The crankshaft is placed in a single bed with replaceable liners of main bearings planted in it. The fourth bearing is equipped with separate thrust bearings that limit shaft axial play.
The pistons are equipped with two compression rings and one oil scraper ring. Semi-floating piston pins are pressed into the upper ends of the connecting rods. Replaceable connecting rod bearing shells are located in the lower heads.
The engine is liquid-cooled based on a centrifugal rotary water pump driven by a timing belt. The coolant circulates through the internal galleries of the engine, washing the cylinders and combustion chambers, and also runs through the channels equipped in the intake piping.
Lubrication of the internal components of the engine is provided by a gear oil pump located at the front of the engine under the timing belt cover. The pump is driven directly from the crankshaft. Oil is drawn through a strainer from the oil pan, then forced through a full-flow cartridge-type filter mounted on the side of the power unit facing the rear bulkhead of the engine compartment.