Hazet 4793-1 Manual

Hazet Ikke kategoriseret 4793-1

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Side 1/2

h 4793/3

Cylinder Head Tightness Tester (CO2 leak detector)

Dear Customer,

You have made a good choice. With a HAZET Cylinder Head Tightness Tester, you

have a quality tool in your hands.

First, some general information: –

Testing can be carried out at any time, whether the engine is hot or cold. As a rule,

no preparation of the vehicle for a routine test is required. Nevertheless, if the

engine has cooled over a prolonged period of time, fresh air will have been drawn

into the cooling system, diluting any combustion gas which may be present in the

air cushion.

The HAZET CO2 Leakage Tester permits the early, rapid and reliable detection of

leaks between the cooling system and the combustion chambers of all coolant

cooled petrol, diesel and LPG engines.

Any combustion gas which leaks into the cooling system through a defect in the

cylinder head gasket, sealing faces, hairline cracks, cylinder liners or even porous

parts of the cylinder head, collects in the air cushion in the radiator or header tank.

The HAZET Leakage Tester enables the air cushion to be tested for combustion gas

(increased CO2 content). Leaks can also be detected subsequently.

The blue detecting fluid indicates whether the in-drawn air contains an increased

level of carbon dioxide by , first to , then tochanging colour from blue green

yellow. An increased CO2 content in the cooling system indicates a leak between

the combustion chamber and the cooling system, i.e. the presence of combustion

gas in the cooling system.

The proven prevents erroneous diagnoses, as"HAZET dual chamber system"

follows. In the lower chamber, alkaline particles are absorbed while, in the upper, a

leak resulting in an increased content of CO2 gas (combustion gas) will give rise

to a change in the colour of the fluid from blue to yellow.

Suggested uses:

As a routine test at every service and before replenishing antifreeze. To check repairs, e.g. after

pronounced overheating of the engine as a result of a leak or defect in the water pump, V-belt,

radiator hose, etc. In combination with a pressure test for externally escaping leaks (max. possible

test pressure, 1 bar); this also reveals leaks which would otherwise only occur at a very high

combustion pressure or when the vehicle is being driven.

Preparation of the Tester, filling and initiation

There are two chambers in the HAZET metal box:

– blue fluid – Reaction fluid HAZET 4793-2

– light blue fluid – Flushing fluid HAZET 4793-3

Remove the two chambers from the Tester by pulling and turning. Pour the blue reaction fluid into

the lower chamber up to the marking line (12 mm). Put the upper chamber on the lower one and

fill it up with the blue reaction fluid up to the line as well. Now put on the upper part with the

suction ball. The Tester is now ready for use.

lower

chamber

upper

chamber

upper part

HIGHEST TECHNOLOGY IN TOOL MANUFACTURE SINCE 1868

Technical data are subject to change

Sensitivity Check

Squeeze the suction ball 2 or 3 times, hold the Tester at your mouth and exhale several times.

Stop breathing once you notice that the reaction fluid turns green. The carbon dioxide in the

breathing air ought to give the fluid in both chambers a yellow colouration within a few seconds.

Regeneration

By squeezing the suction ball again, fresh air will be sucked into the Tester. The Tester will again

be ready for use as soon as the reaction fluid has taken a green colour.

This test should be repeated every time before usage and before refilling the chambers. The fluid

must be renewed if a reduction in sensivity can be noticed.

After usage, the Tester has to be stored in horizontal position.

Directions for use

1.) With the engine at operating temperature, open the lid of the radiator and insert the Tester

into the radiator inlet.

2.) The rubber plug should avoid an escape of trapped gas. It should not sit tight to prevent

vacuum.

Avoid the intake of cooling water: Do not dip the rubber plug into the cooling liquid. Put

the Tester on the slant if neccessary.

3.) Squeezing the suction ball up to five times will be enough to show the presence of

combustion gas in the air cushion on top of the cooling water level. Any discolouration

from bluish green to yellow indicates the presence of combustion air in the air cushion. –

Even a yellowish-green colour indicates a content of carbon dioxide.

4.) If no discolouration of the reaction fluid in the upper chamber can be noticed or if the fluid

turns blue: There is no leakage between the combustion and cooling systems.

Note

Only the discolouration in the upper chamber is significant: A bluish discolouration of the fluid in

the lower chamber indicates a saturation of the fluid with alkaline particles. The fluid therefore has

to be renewed before the next leakage test (see sensivity check and regeneration).

In case of doubt the test can be repeated, the testing condition being improved as follows:

A.) Check the cooling water level and refill it if neccessary so that the air cushion diminishes.

B.) Make a test ride with your car, accelerating several times (very important for diesel

enginges).

C.) Repeat the test after a short cool down (in order to prevent the super pressure in the cooling

system).

Notes on environmental protection

The fluid is ecologically harmless, acid-free and non-inflammable. The fluid can be disposed

without taking any precautions. When spilled on clothes rinse immediately with water in order to

prevent stains.

Prevent pollution of the tester through cooling water. In case of pollution rinse the chambers with

fresh tap water only. Do not use detergents such as soap or powder.

4793/3 engl. 08.2001

Produkt Specifikationer

Mærke:	Hazet
Kategori:	Ikke kategoriseret
Model:	4793-1

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