WARNING! Read and
understand them before conducting test.
The combustion leak test may be used effectively on any type of
internal combustion engine having a radiator, whether gasoline, diesel,
alcohol or liquid gas powered.
TO CONDUCT THE TEST:
WARNING! Since engine will be
running during test, care must be taken to assure vehicle cannot go
into gear accidentally. Take necessary precautions such as securely
setting hand brake, firmly blocking all four wheels, and positioning
shift lever with tape or other restraints to assure it will not move.
Also take care to assure your hands and arms stay well clear of engine
fan, belts, and any other moving items.
Engine should be warm, and allowed to idle during the test. Coolant
MUST be warm and circulating while test is in process.
WARNING! Hot coolant can cause
severe burns. A coolant system can fail at any time from hose rupture,
gasket failure, radiator failure, etc. Protect yourself from these
hazards. Wear goggles, heat resistant gloves and outer clothing that
will protect you from burns if coolant system fails during test.
Remove radiator cap, and check to see that radiator coolant level
is low enough to prevent plugging of unit. Either siphon off or drain
coolant so that level is 2" to 3" below the neck of the
Check color of test fluid, If blue, O.K. to use. If green or
yellow, discard and obtain fresh fluid.
Remove bulb by gently twisting. Pour test fluid from bottle into
test instrument, through either opening in top cap, or remove top cap
if more convenient, to the "fill to here" level line.
Reinstall top cap (it removed) and install bulb by gently twisting
into top plug, metal valve end up.
Insert test instrument firmly into neck of radiator, by gripping
the bottom rubber plug, with a rotating motion, so that a seal is
formed with the inner neck of the radiator. Force radiator gases
through test fluid by squeezing bulb.
Continue to force radiator gases through test fluid by squeezing
bulb for about 1 minute. If fluid turns YELLOW (in diesel
engines, fluid maybe turn green-yellow), a combustion leak is present.
If fluid remains BLUE, a combustion leak is not occurring while
test is in process.
If radiator opening is greater than 1 3/4", insert Block Tester into Large Engine Adaptor plate (which may be purchased as
an accessory). Block radiator overflow outlet with a suitable rubber
plug or piece of _ tape. (Be sure to remove after completion of test.)
Place tester with Large Engine Adaptor plate, on top of radiator
opening, press down firmly to seal, and perform test.
TO LOCATE EXACT SOURCE OF COMBUSTION LEAK:
Should the test fluid give positive results (turn YELLOW), then the
location of the combustion leak may be further pin-pointed to assist in
the repair by following these simple steps:
WARNING! If vehicle has catalytic
converter, disconnect while "exact source" testing is being
done. Increased amounts of unburned fuel in exhaust (caused by spark plug
wire removal) may cause catalytic converter to get too hot. Damage to
converter and ignition of surrounding surfaces with resulting fire could
result. Be sure to reconnect converter after completion of test.
On an In-Line Engine, remove 1 spark plug wire at a time, allowing
engine to idle for a few minutes to purge cooling system of combustion
gases from previous test. Then re-test. Continue this process for
each cylinder until all leaks are located.
On a V type Engine, disconnect all spark plugs on one bank,
allowing engine to purge itself by idling in this condition for 5
minutes. (You may have to keep it running since half of the plugs are
disconnected.) Re-run the combustion leak test. If the fluid stays
BLUE (negative), the leak must be in the non-firing bank. If the fluid
turns YELLOW (positive), the leak is in the firing bank. Then go on to
check each cylinder, as with a. above. However, there may be a leak in
the non-firing bank. Be sure to check both banks, for each cylinder,
until all leaks are located.
AFTER REPAIR IS MADE, DOUBLE-CHECK THE WORK:
|It is very important, after the repair has been made, to flush the
block to expel any accumulated gases. Then, RE-TEST with the
Block Tester for final check on the repair job.
IMPORTANT POINTS TO REMEMBER:
- Seating the instrument is important. Be sure to grip the bottom
rubber cap, rather than the outer fluid tube, since you may cause the
seal to be broken between the tube and the bottom cap, thereby causing
the instrument to become inoperative, or to leak.
- Always be sure the level of the radiator coolant is 2" to 3
below the. neck of the radiator. Otherwise, coolant may be drawn into
the test instrument itself, contaminating the fluid. Should this
occur, remove the test instrument and discard the coolant-test fluid
mixture, rinse unit well with cool, clean water several times, squeeze
the aspirator bulb to remove as much excess water as possible, and
begin the testing process again, after reducing the level of the
radiator coolant to the required level
- Always destroy test fluid which has given a positive test (turned
YELLOW). Do not attempt to return test fluid to the bottle, after
conducting a test which is negative (fluid stays BLUE) - it may carry
contamination, which could ruin the entire bottle of fluid.
- Always put the cap back on the bottle of fluid immediately to avoid
contamination the fluid.
- Always remove the test instrument from the neck of the radiator
immediately after completion of the test. Otherwise, as the engine
stops and the coolant cools, the fluid in the test instrument will be
drawn into the radiator.
THANK YOU FOR YOUR INTEREST IN COMBUSTION LEAK TESTER PRODUCTS --
used properly as an established shop procedure your customer service will
improve, the guesswork of diagnosis of engine vs. cooling system problems
will be removed, and the job will be done right and completely - - the
Fluid should be used within one year of purchase. If fluid is green or yellow-green,
discard and obtain fresh fluid.
Download a pdf copy: Block Tester Instructions.