Renault Megane, Scenic

Since 1996 of release

Repair and car operation

The description of check of a compression and tightness of connections of components

Compression check

Use компрессометр, intended for diesel engines.

CHECK

1. If the engine does not develop a total power or works roughly and if it is not connected with fuel system, compression check can provide you with the information concerning an engine condition. If regularly to carry out this check, it is possible to find out developing malfunction in advance. 2. Use компрессометр, intended for diesel engines as in these engines higher develops, in comparison with petrol, pressure. Компрессометр through a nozzle it is rolled in an aperture for a candle накаливания or for an atomizer (address to an accompanying illustration). 3. If it does not contradict the instruction of the manufacturer компрессометра, execute the following preparation: a) the Accumulator should be charged, the air filter should be pure, the engine should be heated-up to normal working temperature. b) Remove all atomizers or candles накаливания. At removal of atomizers remove also sealing fire-resistant washers (which should be replaced - address to the Head of the Power supply system and release). It is recommended to disconnect also the valve отсечки fuel on the pump not to admit fuel hit in the engine at проворачивании коленвала. 4. At test there is no necessity to press a gas pedal. 5. The so much actual measured compression, as balance between cylinders is important not. The data is resulted in Specifications. 6. The reason of an insufficient compression in the diesel engine is more difficult for establishing, than in the petrol. To define a place of malfunction oil addition in cylinders ("the wet" test) it will not be possible, as there is a probability of that oil will get to the vortical chamber or in dredging on the bottom of the piston and will not get on rings. However the following information will help you to reveal a possible cause of defect. 7. In all cylinders there should be approximately equal pressure; any distinction, more specified in Specifications, specifies in damage. Pay attention that the compression should grow in the serviceable engine quickly; the low compression on the first course, with the subsequent gradual increase on the subsequent courses, specifies in deterioration of piston wheels. The low compression on the first course which does not grow on the subsequent courses, specifies on негерметичность valves or in the burnt through lining of a head of the block of cylinders (also the crack in a head can be the reason). 8. A low compression in two adjacent cylinders most likely because of the lining which have burnt through between them of a head of the block of cylinders. 9. If a compression unusually high, possibly surface of a head of the block of cylinders, valves and pistons are covered by a deposit. In this case the head of the block of cylinders is necessary for removing and clearing of a deposit.

Check of tightness of connections of components

CHECK

1. Check on tightness defines speed of leak of compressed air from the cylinder. It is alternative to check of a compression and in many cases is the best method of check of a condition of the engine as following air easily designates a place, where a compression (piston rings, valves or a lining of a head of the block of cylinders is lost). 2. The equipment necessary for check of tightness of connections of components, will be hardly accessible to the motorist. If the insufficient compression is suspected, address to the expert having the corresponding equipment.