17
CAUTIONS IN COLD WEATHER
1. Cautions in Storage
(1) Use high-grade fuel. (The higher the gasoline quality is,
the more gasoline becomes volatile and the easier the
startup is.)
(2) Prevent the pump main unit, water discharge valve,
vacuum pump and muffler from freezing. After the pump
operation is over, discharge water and use anti-freezing
solution or alcohol. In some cases, it is advisable to keep
the parts warm.
(3) Always keep a required amount of anti-freezing solution.
(4) Confirm that the vacuum pump rotates regularly. If it is
frozen and cannot run, heat it with hot water.
(5) Keep the battery always well maintained.
2. Feeding of Anti-freezing Solution
(1) After draining water completely from the drain cock of each part, tighten the suction port cap, and close the discharge valve
drain cock, muffler drain cock and discharge valve. Attach a tube to the port of muffler drain cock, and place the other end of
the tube in the anti-freezing solution.
(2) After engine startup, set the water suction lever to the suction position, and operate the vacuum pump for about 5 seconds.
When confirming that the compound pressure gauge indicates a negative pressure, set the water suction lever to the water
discharge position and stop the engine. If the pressure does not become negative, confirm that the suction port cap, drain
cock, etc. are tightly closed, and repeat the procedure mentioned before.
(3) Cover the cooling water discharge port with your palm and open the muffler drain cock. So the anti-freezing solution will be
sucked in. If the solution suction reaches by about 2.5 lit. and dose not proceed further, close the drain cock.
(4) Re-start the engine, keep it in operation for about 5 seconds so the solution will spread totally. Set the water suction lever to
the water suction position, return it to the water discharge position when the anti-freezing solution comes out from the
vacuum pump exhaust pipe, and stop the engine.
(5) Open each drain cock, and drain the anti-freezing solution. (For longer no-load operation, never discharge the anti-freezing
solution from the cylinder drain cock. Refer to P. 12
“
For longer no-load operation
”
.
Notes :
1. In cold weather, the vacuum pump may freeze even in operation. In such a case, detach the vacuum pump strainer cap,
and pour 10 ml of the anti-freezing solution. Start the engine, pull the water suction lever, and spread the anti-freezing
solution well in the vacuum pump.
3. Cautions in Handling of Accessories
(1) Be sure to dry up a cloth hose or metal pieces.
(2) Pour hot water on a frozen cloth hose.
Anti-freezing solution
Anti-freezing solution
(%)
Water (%)
10
90
-4.7
20
80
-10.7
30
70
-17.7
40
60
-27.7
50
50
-39.8
Mixture ratio
Freezing temperature
(
℃
)
