VAZ:: 2115: Possible malfunctions, their reasons and methods of elimination

2.1. Possible malfunctions, their reasons and methods of elimination

*Cause of defect*	*Elimination method*
*Knock of radical bearings of a bent shaft*
Usually knock of deaf tone, metal. It is found at sharp opening of butterfly valves idling. Its frequency increases with increase in frequency of rotation of a bent shaft. The excessive axial gap of a bent shaft causes knock sharper with the uneven intervals especially noticeable at smooth increase and reduction of frequency of rotation of a bent shaft
Too early ignition	Adjust installation of the moment of ignition
Insufficient pressure of oil	See malfunction "Insufficient pressure of oil idling"
Bolts of fastening of a flywheel are weakened	Tighten bolts the recommended moment
The increased gap between necks and inserts of radical bearings	Of a neck also replace with Proshlifuyte inserts
The increased gap between persistent half rings and a bent shaft	Replace persistent half rings new or with the increased thickness, check a gap
*Knock of conrod bearings*
Usually the knock of conrod bearings is sharper than knock of radical. It is listened idling the engine at sharp opening of butterfly valves. It is easy to define the place of knock, disconnecting in turn spark plugs
Insufficient pressure of oil	See malfunction "Insufficient pressure of oil idling"
Excessive gap between conrod necks of a bent shaft and inserts	Replace inserts and a neck proshlifuyta
*Knock of pistons*
The knock is usually not ringing, muffled; is caused by piston "beating" in the cylinder. Best of all it is listened with a small frequency of rotation of a bent shaft and under loading
The increased gap between pistons and cylinders	Replace pistons, chisel also to an otkhonin-guyta cylinders
Excessive gap between piston rings and flutes on the piston	Replace rings or pistons with rings
*Knock of inlet and vspuskny valves*
The increased gaps in the valvate mechanism cause characteristic knock, usually with uniform intervals; frequency of its less than the frequency of any other knock in the engine as valves are put in action from the camshaft which frequency of rotation is twice less than the frequency of rotation of a bent shaft
The increased gaps in the valvate mechanism	Adjust gaps
Breakage of a valvate spring	Replace a spring
Excessive gap between the valve and the directing plug	Replace worn-out details
Wear of cams of the camshaft	Replace the camshaft and adjusting washers
*Insufficient pressure of oil idling on the heated-up engine*
Hit under the reducing valve of pressure of oil of foreign particles	Clear the valve of foreign particles and agnails, wash out the oil pump
Jamming of the reducing valve of pressure of oil	Replace the valve
Gear wheels of the oil pump are worn-out	Repair the oil pump
Excessive gap between inserts and radical necks of a bent shaft	Of a neck also replace with Proshlifuyte inserts
Excessive gap between necks and cases of bearings of the camshaft	Replace the camshaft or a head of cylinders with cases of bearings
Use of engine oil of inappropriate brand and quality	Replace oil with another, recommended in the appendix 4
*Excessive pressure of oil on the heated-up engine*
Jamming of the reducing valve of pressure of oil	Replace the valve
The spring of the reducing valve of pressure of oil has big rigidity	Replace a spring
*The raised oil consumption*
Dribble of oil through consolidations of the engine	Tighten fastenings or replace laying and epiploons
The system of ventilation of a case is littered	Wash out details of system of ventilation of a case
Wear of piston rings or cylinders of the engine	Chisel cylinders and replace pistons and rings
Breakage of piston rings	Replace rings
Coking up of cuts in oil scraper rings or grooves in flutes of pistons because of use of not recommended oil	Clear cuts and grooves of a deposit, replace engine oil recommended in the appendix 4
Wear or damage of maslootrazha-telny caps of valves	Replace maslootrazhatelny caps
The increased wear of cores of valves or guides of plugs	Replace valves, repair a head of cylinders
*Engine overheat*
The arrow of the index of temperature of cooling liquid is in a red zone of a scale. Before troubleshooting be convinced of serviceability of the index of temperature of cooling liquid and its sensor (see the subsection "Control Devices").
Insufficient amount of liquid in the cooling system	1. Add cooling liquid in the cooling system
The external surface of a radiator is strongly polluted	2. Clear an external surface of a radiator a water stream
The thermostat is faulty	3. Replace the thermostat
The fan electric motor does not work	4. Check the electric motor, replace - that it or repair
The pump of cooling liquid is faulty	5. Check operation of the pump, replace it or repair
*Bystry falling of level of liquid in a broad tank*
1. The radiator is damaged	1. Repair a radiator or replace
2. Damage of hoses or laying to connections of pipelines, weakening of collars	2. Replace the damaged hoses or laying, tighten collars of hoses