|
4-30-ustanovka-shatunno-porshnevykh-sborok-i-proverka-velichiny-rabochikh-zazorov.html
4.30. Installation of shatunno-piston assemblies and check of size of working gaps in shatunny bearings of a cranked shaft
|
|
- Before installation of shatunno-piston assemblies of a wall of cylinders should be carefully wiped, from their upper edges traces of step wear are completely removed and the facet is removed. It is meant that the cranked shaft is already established on the regular place in the block.
- Uncover the bottom head of a rod of the piston of the first cylinder (make sure available the labels factory or put in the course of dismantle). Take from a head of a rod and its cover loose leaves of the old bearing and carefully wipe their beds pure неворсящейся rags.
|
|
Check of a working gap of the shatunny bearing
|
|
Try not to touch surfaces of new loose leaves barehanded in order to avoid undesirable contact of bearings to traces of oil always present on fingers and chemically aggressive substances. |
|
|
- Wipe a back of the new top loose leaf and put it to bed the bearing in a rod head. Track, that the directing uvula of the loose leaf got to a reciprocal flute in a rod. At all застукивайте the loose leaf in a bed a hammer. Grease with nothing the bearing at this stage.
- Wipe a back of the second loose leaf and lay it in a cover of the bottom head of a rod. Again track, that the uvula got to a reciprocal groove. Do not apply some any greasing — extremely important that interfaced surfaces of the bearing and a rod remained absolutely pure and dry.
|
- Arrange piston rings locks, as shown.
|
|
|
|
AT ALL have no locks of rings to coaxially piston finger, or perpendicular to its axis! |
|
- Grease the piston and piston rings with pure impellent oil.
- Put on the piston a tool opravka for a staving of rings. Leave a skirt of the piston acting of a tool opravka approximately on 6.4 mm for free filling it in the cylinder. Rings should be pressed out aflush with a forming surface of the piston.
- Turn a cranked shaft so that the neck of the first crank appeared in situation NMT. Grease with impellent oil a mirror of the first cylinder.
|
- Having developed assembly by a forward label in the form of deepening or an arrow on the piston bottom forward on the engine, accurately pass a rod in the first cylinder of the block. Fill in the cylinder a piston skirt, having densely pressed to a block surface bottom edge of an opravka of the tool for a staving of rings.
|
|
- To Obstuchita the upper edge of an opravka for a guarantee of density of its pressing to the block on all perimeter of bottom edge.
|
- Accurately tapping on the piston bottom with the wooden handle of a hammer, enter the piston in the cylinder, at the same time directing the bottom head of a rod on a neck of the corresponding crank of a cranked shaft. Piston rings can unexpectedly jump out from under a tool opravka therefore constantly watch pressing density to its block. Act without hurrying up, at emergence of the slightest resistance immediately stop a piston zastukivaniye. Find out the reason of jamming and eliminate it. At all do not undertake attempts to push the piston in the cylinder force — it can lead to its mechanical damage or destruction of piston rings.
|
|
- After introduction of shatunno-piston assembly in the engine, before final installation of a cover of the bottom head of a rod, it is necessary to check a working gap of the shatunny bearing of a cranked shaft.
|
- Cut off a piece of the calibrated plastic wire from a measuring set of Plastigage, in the length width of the loose leaf of the shatunny bearing are slightly shorter, and lay it along the first shatunny neck of a cranked shaft, parallel to an axis of the last.
|
|
- Wipe a bearing surface in a cover of the bottom head of a rod and establish a cover on a rod. Track, that the label on a cover appeared is turned in the same party, as a label on a rod.
- Return bolts of fastening of a cover and in three stages tighten them with demanded effort.
|
|
In order to avoid key jamming, use a thin-walled face head. At emergence of signs of jamming of a key between a head of a bolt and a rod, slightly raise a head and continue a tightening. Do not allow a provorachivaniye of a cranked shaft in the course of performance of all procedure. |
- Turn out bolts and carefully uncover a rod. Try not to damage the flattened-out piece of the calibrated wire.
|
- Till width of the flattened-out wire measured on a scale, printed on packing to Plastigage set, define size of a working gap in the bearing. Compare result of measurement to requirements
of Specifications.
|
|
- Alternatively working gaps in shatunny bearings can be defined by a calculation method by carrying out measurements of diameters of shatunny necks a shaft and internal diameters of bearings (loose leaves are laid in a bed, assembly of covers is established, the shaft — is not present).
|
A.
B.
|
- If the size of a gap falls outside the limits an admissible range before looking for loose leaves of other standard size, check, whether got under backs enclosed in a bed in a rod and a cover of loose leaves dirt / oil. Once again measure diameter of a neck of a shaft. Rasplyushchivaniye of a wire since one end more than from another speaks about existence of a konusnost of a neck.
|
|
Final installation of shatunno-piston assembly
|
|
- Carefully scratch out a nail or edge of an old credit card all traces of the calibrated wire from a neck and/or bearing surface.
- Make sure of absoluteness of purity of both bearing surfaces, then evenly grease them with a thin layer of molibdensoderzhashchy assembly impellent greasing. For ensuring access to a surface of the top loose leaf it is necessary to push a little the piston in the cylinder — do not forget to put on bolts of a cover of a rod protective hoses in order to avoid damage of a surface of a neck of a shaft. Try not to allow vyskakivaniye from the cylinder of piston rings.
- Return a rod into place, having carefully put on it the bottom head a neck of the crank, remove from bolts protective hoses, establish a cover, and in three stages tighten fixing nuts with demanded effort.
|
|
|
Track correctness of combination of labels on a cover of a rod and its bottom head. |
|
|
- Repeat all procedure for the remained shatunno-piston assemblies.
- Do not lose sight of the following important points:
- Watch that on backs of loose leaves and their bed in rods and covers dirt did not get;
- Watch, that each assembly was established in the cylinder (even in case of installation of new components as gaps of piston rings were adjusted to concrete cylinders);
- Pistons should settle down a label / arrow on the bottom forward on the engine (towards GRM drive);
- Do not forget to grease before installation of assemblies by impellent oil of a mirror of cylinders;
- Do not forget to grease bearings (after check of working gaps in the last) before final installation of covers.
- Having finished installation of shatunno-piston assemblies, check freedom of rotation of a cranked shaft, having turned it several times manually.
- In summary it is necessary to check once again axial люфт a cranked shaft (see. Installation of a cranked shaft and check of working gaps of radical bearings).
- Compare results of measurement axial люфта to requirements
of Specifications. If люфт was in norm before dismantling of the engine and the old shatunno-piston assemblies are used, no surprises should be. In case of a size exit люфта out of admissible limits after replacement of rods, the last are necessary for removing from the engine and to give to a car-care center workshop for the corresponding machining.
|
|
|
|
