Honda Civic/Acura Integra

since 1994 release

Repair and operation of the car

Check of a state and selection of inserts of radical and shatunny bearings of a cranked shaft state roverka

In spite of the fact that bearings of a cranked shaft in the course of capital repairs of the engine are subject to replacement without fail, old inserts should be kept for the purpose of attentive studying of their state which results can give a lot of useful information about the general condition of the engine. On an illustration examples of typical defects of inserts of bearings are given below.

The exit of bearings out of operation can occur owing to a lack of greasing, hit of particles of dirt, overloads of the engine and development of corrosion. Regardless of nature of defects, the reason of damage of inserts has to be eliminated in the course of performance of capital repairs of the engine in order to avoid recurrence.

For survey take inserts of bearings from the beds in the engine block / the lower heads of rods and radical / shatunnykh covers and spread out them as installation on a pure working surface. Organization of placement of inserts will allow to tie nature of the revealed defects to a condition of the corresponding necks of a shaft.

Dirt and foreign particles get to the engine in various ways. They can be left in the block in the course of assembly of the unit, or get via filters or system of ventilation of a case. All particles getting to motive oil finally appear sooner or later in bearings. Often the metal sawdust which is formed in the course of normal operation of internal components of the engine takes root into soft material of inserts. The probability of presence at bearings of traces of an abrasive is great, in particular, when the due attention was not paid to cleaning of the block after completion of recovery repair of the engine. Regardless of a way with which foreign particles get to the engine, as a result they with high degree of probability are introduced in a soft surface of inserts of bearings of a cranked shaft and easily come to light at visual survey of the last. Large particles usually are not late in inserts, but leave on their surface and a surface of necks of a shaft noticeable traces in the form of scratches, cavities and zadir. The best guarantee from such troubles is the responsible relation to cleaning of components after completion of capital repairs of the engine and care of observance of purity at assembly. Frequent regular change of motive oil also allows to prolong service life of bearings significantly.

Oil starvation can be a consequence of several various, but often interconnected phenomena. So, the overheat of the engine conducts to fluidifying of engine oil and its replacement from working gaps of bearings. The lack of greasing of bearings can speak the excessive size of working gaps, and also usual leaks (internal or external). Continuous excess of turns of the engine is often found reason of replacement of oil from gaps of bearings. The violation of passability of maslotok (which is usually connected with the wrong combination of openings at installation of components) also conducts to reduction of supply of greasing to bearings. Typical result of oil starvation is the full or local wipe / vyryvaniye a blanket of inserts from a metal substrate. Thus working temperature can rise to such level that the substrate gets a bluish shade as a result of an overheat.

The driving manner also peculiar to the owner of the car has essential impact on service life of bearings. The movement with a small speed on an overgear leads to the considerable overloads of bearings which are followed by replacement of an oil film from their working gaps. Such overloads lead to increase of plasticity of inserts and emergence of cracks in a blanket (fatigue deformation). Thus surface material starts crumbling and separating from a steel substrate. Operation of the car in a city cycle (frequent trips on short distances) conducts to development of corrosion of bearings because the insufficient warming up of the engine involves loss of condensate and release of chemically aggressive gases. These products accumulate in motive oil, forming slags and acids. At hit of such oil in bearings aggressive substances promote development of corrosion of inserts.

The wrong installation of inserts in the course of assembly of the engine can also be the reason of their fast destruction. Too hard landing does not provide the demanded size of a working gap of bearings that leads to their oil starvation. Under inserts in the course of installation of foreign particles formation of eminences the blanket with which is quickly wiped is result of hit.

Selection of inserts

In case of wear or damage of inserts of radical bearings, and also when it is not possible to achieve the correct size of a working gap (see Installation of a cranked shaft and check of working gaps of radical bearings or Installation of shatunno-piston assemblies and check of size of working gaps in shatunny bearings of a cranked shaft), the situation can be corrected in the way described below, in the way of selection and installation of new inserts. If the cranked shaft was exposed to a pro-point, it has to be completed with inserts corresponding repair (with belittling) the sizes – usually selection of inserts is carried out by the experts making a pro-point of necks of a shaft. Regardless of a technique of determination of the demanded size of inserts working gaps of bearings have to be then are checked with application of the measuring Plastigage set (see below).

If it is not possible to correct properly the size of working gaps by selection of inserts, the shaft should be replaced.

Radical bearings

PERFORMANCE ORDER

1. In need of selection of new inserts of the STANDARD size pick up what has the same color marking, as old. 2. If color marking of an old insert is lost, find the marking which is beaten out on the block for necks of radical bearings (see an accompanying illustration). 3. Also check marking of a class of radical bearings actually on a shaft (see an accompanying illustration). 4. At selection of new inserts use an ID card of color marking (see below). A B With D 1 THE RED THE PINK THE YELLOW THE GREEN 2 THE PINK THE YELLOW THE GREEN THE BROWN 3 THE YELLOW THE GREEN THE BROWN THE BLACK 4 THE GREEN THE BROWN THE BLACK THE BLUE

Shatunny bearings

PERFORMANCE ORDER

1. At selection of new inserts of the STANDARD size use also color marking. 2. In case of loss of a color code on old inserts, find marking on the lower heads of rods (see an accompanying illustration). The tag in the form of figure characterizes a dimensional class of the shatunny bearing (it is not necessary to confuse it to number of the cylinder). 3. Check also warranty tags actually on a shaft (see an accompanying illustration). 4. At selection of new inserts use an ID card of color marking (see below). A B With D A or I THE RED THE PINK THE YELLOW THE GREEN B or II THE PINK THE YELLOW THE GREEN THE BROWN C or III THE YELLOW THE GREEN THE BROWN THE BLACK D or III THE GREEN THE BROWN THE BLACK THE BLUE

All bearings

Remember that the final parameter defining correctness of selection of inserts is the result of measurement of working gaps in bearings. Safely ask any questions representatives firm service center of the Honda company.