Nissan Primera

1990-1992 of release

Repair and car operation



Nissan Primera
+ Nissan Primera brand Cars
+ Current leaving and service
- Engine
   Removal and engine installation
   Engine dismantling
   Engine assembly
   Head of cylinders and drive of the gas-distributing mechanism
   Pistons and rods
   Crankshaft and crankshaft bearings
   Block of cylinders
   Compression check
   System of greasing of the engine - the general information
   Removal and installation of the pallet of a case
   Oil pump
   Check of pressure of impellent oil
+ cooling and heating Systems
+ the Power supply system and production of the fulfilled gases
+ System of electric equipment of the engine
+ Manual transmission, differential and main transfer
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Appendices



Pistons and rods

Removal and installation

Piston details

1 — a piston finger
2 — the piston
3 — piston rings
4 — a shatunny bolt
5 — a rod
6 — loose leaves of the shatunny bearing
7 — a cover of the shatunny bearing
8 — a nut of the shatunny bearing

Details of the piston are shown on an illustration above. For removal of pistons the engine should be dismantled and the head of cylinders is removed. The case pallet also should be removed to reach shatunny bearings. Familiarize with sections relating to it.

Pistons and rods are pushed out by the hammer handle from the interior of the block of cylinders after covers and loose leaves of shatunny bearings will be removed. Before performance of these works it is necessary to familiarize with below-mentioned instructions concerning designation and the installation direction:

Each piston and the corresponding rod should be designated cylinder number from which they act in film. It is best of all for making having written on the piston bottom cylinder number. Also to put on the piston an arrow indicating the forward party of the engine. When the piston the late will be cleared of an oil deposit, the shooter should put once again.

At piston removal with a rod observe the exact adjusting provision of a cover of the shatunny bearing and right after removal check a rod and a bearing cover on existence of number of the cylinder on one party.

The bottoms of pistons have a notch on an edge (the injector engine) or to the shooter (the carburetor engine) who should be turned forward. Rods have masloraspylitelny openings. At the established details oil openings, designations of shatunny bearings and the direction "forward" should be in shown on an illustration below situation. On an illustration details of the injector engine are represented. On the carburetor engine on the contrary, i.e. number of a rod and a cover is on the same party, as a masloraspylitelny opening.

Correctly assembled piston and rod of the injector engine. At the carburetor engine of a label (4) and a masloraspylitelny opening (2) should lie on one party

1 — before
2 — a masloraspylitelny opening
3 — the size of the piston
4 — cylinder number

 PERFORMANCE ORDER

  1. Mark loose leaves of bearings concerning rods and covers. Also designate the top and bottom loose leaves color on a reverse side.
  2. Remove covers and loose leaves of bearings.
  3. To Vytolknita pistons and rods by means of the hammer handle from the interior of the block of cylinders up. If it is required to remove a ring of an oil deposit on the top party of openings of cylinders by means of a shaber.
  4. Remove piston rings one after another by means of nippers through the piston bottom, as is shown in an illustration below. If rings are used again, it is necessary to mark them. If there are no special nippers for piston rings, it is possible to insert metal strips under a ring from the opposite sides of the piston. One strip surely enclose under a ring joint in order to avoid scratches.
Removal or installation of piston rings by means of special nippers.
  1. Vypressuyte a piston finger from the piston and a rod. For this purpose heat up the piston to temperature 60-70 ° (hot water). Remove both lock rings from a piston eye, put the piston as appropriate and выпрессуйте a finger from the piston and a rod eye. Gather everything relating to one piston and a detail rod.

Check of pistons and rods

 PERFORMANCE ORDER

  1. Carefully check all details. If details have signs of a rust of scratch or wear, it is necessary to replace them. Measure a vertical gap of piston rings in piston grooves, inserting serially rings into the corresponding grooves, as is shown in an illustration below. By means of flat щупа define a gap between a surface of a ring and an internal surface of a groove. If the gap of rings makes more than 0.20 mm, either rings or the piston are worn-out replace in a set. Demanded values of a gap are specified in Specifications.

Measurement of a vertical gap of piston rings in piston grooves. Shchup should be inserted according to the bottom image in the left drawing

1 — flat щуп
2 — a piston ring
  1. Serially insert all piston rings from the top party of a case into the cylinder. Insert by means of the overturned piston of a ring approximately on piston height. Thanks to it they will sit in an opening exactly. Insert flat щуп into a gap between the ring ends, as shown on the right on an illustration below to measure a gap in the lock. Mi one ring should not have a gap more than 1.0 mm. Demanded values are specified in Specifications.

Gap check in locks of piston rings. To move rings down the overturned piston and then to measure, as is shown in the right drawing

1 — the piston
2 — a piston ring
3 — flat щуп
  1. At too small gap (for example, at new rings which also should be measured) the ends of a ring can be undermined. For this purpose clamp a file in a vice and undermine ring end faces. At too big gap the ring should be replaced. If it is required to replace only piston rings, without chiseling cylinders a gap in locks it should be measured on the bottom party of the cylinder. The top and average piston rings from the top party have designations (not on all engines). It is necessary to establish all rings so that designation (if is available) could be read from above. Check piston fingers and plugs of rods on existence of a rust and wear. If in an unsatisfactory condition there is only one rod, it is necessary to replace all set.
  2. The place of landing of a piston finger in the piston should be such that the finger at room temperature could be pushed in the piston by hand (see an illustration below). The finger gap in the piston makes 0.004 — 0.00 mm, however it is difficult to measure it. Therefore check should be carried out approximately.

Check of installation of a piston finger

The piston finger at room temperature should be pressed by a hand thumb.
  1. Check rods by means of the special device on twisting and a bend. If there is a possibility to use such device, boundary values for twisting 0.15 on 100 mm, 0.30 for a bend.

Measurement люфта shatunny bearings

This work is described in the Section Crankshaft and crankshaft bearings in connection with cranked shaft. It is made by means of a polymeric hair of "Plastigage" or it is possible to measure internal diameter of the shatunny bearing and external diameter of a neck of the crankshaft.

Assembly of pistons and rods

Heat up a rod eye to temperature 60 - 70°С (lower in hot water). Prepare a suitable core which is inserted into an internal part of a piston finger.

Well grease a piston finger and an opening of an eye of a rod.

Insert a lock ring of a piston finger on the one hand into the piston. Check, that it well sat down in a groove.

Press a finger a suitable opravka in a warm rod.

At assembly the following instructions should be observed:

  1. Arrow on the piston bottom (or drawn, or on new pistons the beaten out — see an illustration) should indicate a forward part of the engine.
  2. Designations of numbers of cylinders on rods and covers of bearings should coincide (illustration). Consider a difference between the injector and carburetor engine.

 PERFORMANCE ORDER

  1. Check, that pistons after assembly freely could move on rods.
  2. Piston rings are established or by means of special nippers from the piston bottom (illustration), or by means of the metal strips mentioned at removal. When the ring will be flush with a groove a metal strip is removed, so the ring sits down in a groove. It is possible to mix two kompressionny rings, therefore it is necessary to pay attention to their cross-section section before establishing them. If rings are well marked, to mix them quite difficult. Besides both kompressionny rings have on one party designation (the letter "R" can be beaten out on the carburetor engine) which it should be visible from the piston bottom.
  3. Put assembled pistons before installation on a pure surface and cover them that on them the dust did not get. As details are already greased it is necessary to watch that on pistons foreign matters did not get.

Assembly of pistons and rods

 PERFORMANCE ORDER

  1. Well grease a mirror of cylinders.
  2. Insert shatunny bolts and rods, enclose loose leaves of bearings.
  3. Arrange rods according to numbers of cylinders. Masloraspylitelnye openings should be on the set party of the block of cylinders. On an illustration it is represented, as pistons and rods on the injector engine should settle down. On an illustration the provision of details at the carburetor engine below is shown.

The correct assembly of the piston and rod on the carburetor engine. The arrow is turned to the forward party of the engine

1 — the size of the piston
2 — a mark "before"
3 — a masloraspylitelny opening
4 — cylinder number
  1. Labels on the bottom of pistons, i.e. a label on an edge (the injector engine) or an arrow (the carburetor engine) should indicate the forward party of the engine.
  2. Arrange locks of piston rings on a circle on 120 ° to each other. On an illustration it is shown, how locks of rings are displaced rather piston fingers. On engines of both executions of a ring settle down equally.

Arrangement of locks of piston rings. The big arrow indicates the forward party of the engine

1 — the lock of a broad element of a maslosjemny ring
2 — the lock of the top ring and the top element of a maslosjemny ring
3 — the lock of the second ring
4 — the lock of the bottom element of a maslosjemny ring
  1. Impose a coupling tape for piston rings and press rings in grooves. Check, that they correctly rose on the places. If the coupling tape is not present, it is possible to use a big shlangovy collar or to put thin metal strips round rings and compress the ends so that rings entered into grooves. The piston insert after it will be once again checked that extraneous subjects on it are not present. If the shlangovy collar is used, it is possible to establish it round a ring while the ring will not enter into the cylinder. Then rearrange a collar on the following ring and enter it into an opening. Then the same do with the top ring.
  2. Put on a short piece of a rubber or polymeric hose rod bolts not to scratch an opening.
  3. Turn the crankshaft while two necks of the crankshaft will occupy situation NMT.
  4. Insert a rod from above into an opening. For this purpose put the engine on one side that it was possible to establish a rod on a neck and not to scratch an opening or a shatunny neck. Loose leaves of shatunny bearings already should be in a rod, ledges in dredging and both oil openings on one line.
  5. Move the piston while rings will enter into an opening, as is shown in an illustration below, and the end of a rod will rise on a crankshaft neck.
Piston installation. The established coupling tape (1) slides at a piston vdviganiye
  1. Enclose the second loose leaf of the bearing, well grease the loose leaf and press a cover to a bolt of a rod and slightly hammer. Pieces of a rubber hose should be removed previously. Surely watch that that numbers on a rod and a cover of the bearing were on one party and corresponded each other as at the last minute it is possible to commit a mistake.
  2. Grease surfaces of a prileganiye of a nut on covers of shatunny bearings.
  3. Tighten new shatunny nuts alternately with effort of 14-16 N • m. To sustain the inhaling moment, it is necessary to establish a head of cylinders on a sealing surface. Ask the assistant to hold the block and tighten both shatunny bearings located from above. In the same way once again tighten nuts of shatunny bearings with effort of 40-45 N • m for the injector engine or 23-29 N • m for the carburetor engine.
  4. After rod installation several times turn the crankshaft at once to reveal jamming.
  5. Once again check designations of all rods and check that pistons were turned into the correct direction.
Measurement axial люфта the rods established on the crankshaft. Shchup is inserted between a rod and a working surface of the crankshaft.
  1. With the help щупа measure a gap between a lateral surface of a rod and the crankshaft, as is shown in an illustration. It is axial люфт shatunny bearings which should make no more than 0.50 mm. At excess replace the corresponding rod or the crankshaft.