Test - TM-55-1930-208-240303

TM 55-1930-208-24

4-16. BLOCK, CYLINDER - Continued.

b. Test - Continued.

(5) With the cylinder block prepared as shown in figure 4-52, the core hole plugs installed and the plugs removed

from the oil passages, test the block as follows:

METHOD "A".

(a)

This method may be used when a large enough water tank is available and the cylinder block is

completely stripped of all parts.

(b) Immerse the block for twenty minutes in a tank of water heat d to 180-200 (82-93 ).

which indicate the presence of cracks or leaks in the block. A cracked cylinder block must be replaced

by a new block.

(d) After the pressure test is completed, remove the block from the water tank. Then remove the plates and

gaskets and dry the block with compressed air.

METHOD "B"

(a) This method may be used when a large water tank is unavailable, or whenit is desired to check the block

for cracks without removing the engine from the equipment which it powers.

(b) 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 permanent type antifreeze. The antifreeze will

penetrate small cracks and its color will aid in detecting their presence.

(c)

Install the remaining sealing plate and tighten it securely.

(d)

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 work its way through any cracks which may exist.

(e) 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.

4-70