Fig. 11 - High Pressure Areas on Cylinder Liner
This method may be used when a large water tank is
unavailable, or when it is desired to check the block for
cracks without removing the engine from the equipment
Fig. 10 - Honing Bore of Cylinder Block
which it powers. However. it is necessary to remove
With the cylinder block prepared in the above manner,
the cylinder head. blower, oil cooler, air box covers and
the core hole plugs installed and the plugs removed
from the oil passages, test the block as follows:
1. Attach sealing plates and gaskets as in Method "A".
However, before attaching the last sealing plate, fill the
water jacket with a mixture of water and one gallon of
This method may be used when a large enough water
permanent type antifreeze.
The antifreeze will
tank is available and the cylinder block is completely
penetrate small cracks and its color will aid in detecting
stripped of all parts.
1. Immerse the block for twenty minutes in a tank of
CAUTION: Do not use a methoxy propanol base
water heated to 180-200 °F (82-93 'C).
antifreeze as it is detrimental to the water seals.
2. Apply 40 psi (276 kPa) air pressure to the water
2. Install the remaining sealing plate and tighten it
jacket and observe the water in the tank for bubbles
which indicate the presence of cracks or leaks in the
block. A cracked cylinder block must be replaced by a
3. Apply 40 psi (276 kPa) air pressure to the water
jacket and maintain this pressure for at least two hours
to give the water and antifreeze mixture ample time to
3. After the pressure test is completed, remove the
work its way through any cracks which may exist.
block from the water tank. Then remove the plates and
gaskets and dry the block with compressed air.
4. At the end of the test period, examine the cylinder
bores, air box, oil passages, crankcase and exterior of
the block for presence of the water and antifreeze
mixture which will indicate the presence of cracks. A
cracked cylinder block must be replaced by a new block.
5. After the test is completed, remove the plates, drain