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Checking the engine block
| - Before you begin checking the status of the engine block should be thoroughly clean (see. Section Cleaning the engine block).
- Visually inspect the unit in the presence of a cracking and corrosion. Check bolt holes for any disruption of the thread. Not bad as a block to make check for hidden cracks in a garage, where for this purpose there is a special equipment. In the case of defects should be to repair the unit (if possible) or replace it.
- Check the mirror cylinder for scratches and seizure.
- Measure the diameter of each of the cylinders in the upper part (the area immediately below the boundary stepped wear), the middle height and closer to the lower edge. The measurement is performed in a plane passing through the axis of the crankshaft.
 | - Measurement of a bore coaxial to the crankshaft is made in three cross-sections - a wear boundary of the step (A), in the middle part (B) and above the bottom sections (C).
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- Then measure the diameter of the cylinders in the same plane, but perpendicular to the axis of the crankshaft. Compare results of measurements to requirements of Specifications.
- In the absence of access to accurate measuring instruments clearance between the piston and the cylinder walls can be determined (although less reliably) by means of a special probe blade type. The probe must be equipped with a set of blades of varying thickness of about 30.5 cm in length and can be purchased at almost any auto parts store.
- To determine the gap, select the required thickness of the probe and insert it between the piston and the cylinder wall. The piston must be located in the cylinder as it is during normal operation. Blade Probe tightly inserted into the gap between piston and cylinder wall for one of the abutment surfaces (at 90 ?� to the piston pin hole under).
- After the introduction of the blade should slide piston in a cylinder with a moderate resistance.
- If the piston falls, slips or is too loose, it needs to be replaced. If jamming of the piston occurs only at the bottom of the cylinder with the free sliding of the above, there is a taper cylinder. Changing the planting density probe in the cylinder during rotation of the piston (with the stylus) in the cylinder of a roundness of said latter.
- Repeat this procedure for the remaining pistons and cylinders.
- In the presence of the mirrors of cylinders deep scratches or heavy scoring or in case of exceeding the permissible values of the taper or oval unit should be given to a workshop for the honing and bore cylinders. After the bore cylinder block produced equipment pistons and piston rings new repair sizes.
- If a mirror of cylinders found in a satisfactory condition and wear is within acceptable limits, as well as according to the gap between the pistons and the cylinder walls of the requirements of the Specifications, the cylinder bore is not required. All that must be done - honing mirrors (Section Honing cylinders).
- The engines can be equipped with components of one of the three types of standard size (nominal, with excess and belittling). For example cylinders can have a size in excess of, the cervix main and connecting rod bearings - with belittling and camshaft bearings - in excess. On the surface of the block such engines, the crankshaft or oral pushers knocked alphanumeric code indicating the size of the factory installed pistons. On the V8 engines on the counterweight of the eighth crank equipped necks size with belittling crankshaft bear letter indices "M" or ?�R?�. The code "M 2-3" indicates that the second and third main journals have a size with belittling 0.025 mm, while the letter "R" indicates the code size belittling crankpins.
- Engines c sockets pushers over-sized, usually marked with a label-shaped diamond and stamped on site at the top of the front wall of the block, while the index "X" stamped on the court at the end of the cylinder head means installing valves with rod size in excess of (0.127 mm) .
 | - Crankshaft V8 engine can be marked by an alphanumeric code stamped on the counterweight crank eighth and speaking that the shaft is equipped with native (the label "M") or Crank (label ?�R?�) necks size with belittling.
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Tags, talking about the hardware components of the repair sizes V8 engine STATE | DESIGNATION | LOCATION CODE | Crankshaft (size with belittling) MM 0.0254 (0.001 inch) | R or M; M-2-3, etc. (indicates the size with belittling indigenous necks ?��?�� 2 and 3); and / or R-1-4, etc. (indicates the size with belittling crankpins ?��?�� 1 and 4) | Milled area on the counterweight of the eighth crank | Hydraulic pushers (size in excess) MM 0.2032 (0.008 inch) | Tag as diamond (diamond-shaped) | The label is stamped on the platform at the top of the front wall of the engine and to the site on the outer surface of the socket each O / S pusher | Valve stem (the size of the excess of) 0.127 MM (0.005 inch) | X | The ground next milled with two conical holes (3/8 inch (9.5 mm)) at each of the ends of the cylinder head |
 | Codes repair component sizes 6 cylinder engine located on the site between the distributor and the ignition coil. |
CODE | COMPONENT | Size with belittling | P | One or more crankpins | MM 0.0254 (0.001 inch) | M | All the main journals | MM 0.0254 (0.001 inch) | PM | All the main journals of the crankshaft and one or more connecting rod | MM 0.0254 (0.001 inch) |
CODE | COMPONENT | SIZE in excess | B | All cylinders | MM 0.0254 (0.001 inch) | C | All bearings of a camshaft | MM 0.0254 (0.001 inch) |
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