Nissan Maxima QX

since 1993 release

Repair and operation of the car



Nissan Maxima QX
+ Cars of the Nissan Maxima brand
+ Maintenance instruction
+ Settings and routine maintenance
- Engine
   + SOHC engines
   + DOHC engines
   - General capital repairs of the engine
      General information
      Check of pressure of oil
      Check of compression pressure in cylinders
      Diagnostics of a condition of the engine with use of the vacuum gage
      Alternative versions of schemes of recovery repair of the engine
      Removal of the power unit from the car - preparation and precautionary measures
      Removal and installation of the engine
      Order of dismantling of the engine by preparation it to capital repairs
      Dismantling of a head of cylinders
      Cleaning and check of a condition of a head of cylinders
      Service of valves
      Assembly of a head of cylinders
      Removal of conrod and piston assemblies
      Removal of a bent shaft
      Cleaning of the block of the engine
      Check of a condition of the block
      Honingovaniye of mirrors of cylinders
      Check of a condition of components of conrod and piston group
      Check of a condition of a bent shaft
      Check of a state and selection of inserts of radical and conrod bearings of a bent shaft
      Check of a condition of camshafts, pushers of valves and bearings
      Engine assembly order
      Installation of piston rings
      Installation of a bent shaft and check of working gaps of radical bearings
      Installation of a back epiploon of a bent shaft
      Installation of conrod and piston assemblies and check of size of working gaps in conrod bearings of a bent shaft
      Trial start and running in of the engine after capital repairs
+ Cooling systems, heating
+ Power supply system and release
+ Engine electric equipment
+ Control systems of the engine
+ Transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment



Installation of piston rings

 PERFORMANCE ORDER

1. Before installation of new piston rings it is necessary to check gaps in their locks. It is meant that side gaps of landing of rings in flutes of pistons are already checked and meet accepted standards (see the Section Check of a Condition of Components of Conrod and Piston Group).
2. Spread out conrod and piston assemblies with sets of rings on a working surface of a workbench. From this point each set of rings will "be rigidly tied" to the piston. Now it is possible to start measurement of gaps in locks of rings.

3. Fill top (No. 1) a compression ring in the first cylinder of the engine and level it perpendicularly, having pushed the piston bottom down. The ring has to appear around the lower bound of the working course of rings in the cylinder.

4. Determine gap size in the ring lock by means of the probe of lezviyny type. The edge(s) of the probe has to slip hardly in the lock. Compare result of measurement to requirements of Specifications. If the size of a gap exceeds the limit of admissible range in this or that party before taking any actions for correction of a situation (see below), once again make sure that did not mix a ring.

5. If the gap is too small, it can be expanded by boring with a file with small tooth. Clamp a rectangular file in a vice, then put on a ring the lock a file so that the end of the last appeared in a circle. Slowly pull a ring on yourself, removing excess of metal from its end faces in the lock. Having reached the end of a file, remove a ring, again check a gap, in case of need repeat the procedure.

Do not push a ring from yourself at all on a file as at the same time edges of the lock will meet, and the risk of destruction of metal is high.

6. The excessive size of a gap is not crime if does not exceed value of 1.02 mm. Once again make sure that the acquired sets of rings meet according to the characteristics requirements of the engine of your car.
7. Repeat the procedure for the remained rings (the second compression and oil scraper) the piston of the first cylinder, then for rings of all other pistons. Remember that now each set of rings "is unambiguously tied" to the piston on which has to be established.
8. Having checked and having modified properly gaps in locks of rings, it is possible to start their putting on on the pistons.
9. The first on the piston the oil scraper (lower) ring puts on. The oil scraper ring consists of three separate sections. At first fill a spring dilator in the lower flute of the piston. If the dilator is equipped with an antirotational uvula, track that the last got to reciprocal drilling in a piston flute. Now establish the lower working section of a ring in a flute. In order to avoid casual damage of working sections of an oil scraper ring do not use any tool for their installation, - just bring to a flute under/over a dilator at first one end of section, densely press it a finger and, moving on ring perimeter, fill the rest. In the last turn the top working section of a ring is established.

10. Having put all three components of an oil scraper ring in the lower flute of the piston, check freedom of rotation (sliding in a flute) the top and lower working sections.
11. The second (lower) compression ring is established by the following. The ring has to be established by marking up (to the piston bottom).

Strictly follow instructions of manufacturers of rings which are usually printed on packing of a set. Do not mix the second compression ring with first (top) - they have various cross section.

12. Having used a special dilator and having tracked that the ring was turned by marking up, put him in an average flute on the piston. Try not to part the ring lock more than it is really necessary for its free putting on on the piston.

13. Working in a similar manner, establish the first (top) compression ring (marking up). Try not to mix the top ring with the second.
14. Working in a similar manner, serially complete with rings all remained pistons.