Coolant Change
Yanmar 3GM30FC (Japan, circa 1999)
Background:
Yanmar accepts the following
antifreeze applications in their products, present and past models:
1. Ethylene glycol-Changed
annually regardless of hours of operation.
2. Extended Life Antifreeze
or Coolant (Meets or exceeds ASTM D3306 & D4985)
Changed every two years or
250 hours whichever comes first.
-Yanmar Ultralife YG30
-Dex-Cool Long Lfe Coolant
-Havoline Extended Life
Antifreeze
Benefits of extended life
coolants:
1. reduces
hard scale build up
2. better
heat transfer
3. no
phosphate or silicate formation
4. long
term corrosion protection for aluminum, bronze and cast iron
5. improved water pump life
Thomas J. Watts
Technical Support, Mack
Boring & Parts Company
908-964-0700 ext. 286
Equipment List:
0.5 gal Dexcool-type Extended
Life Antifreeze (ex. Prestone 5yr/150000mi)
Or 1
gal of pre-mix version of above
Coolant system flush (must be
safe for aluminum) (ex. Prestone Super Flush)-Optional
Pliers
Funnel
Bucket or catch-basin
Water (Makeup water should be
soft water or distilled water)
Instructions:
1/ On
a cool engine, loosen the filler cap and drain old coolant into container. On
my engine, there are 3 drain points. Most volume came out of the block drain
fitting on the port side just aft of the oil filter. Approx. 16 oz came out of
the 2 drains on the heat exchanger, starboard side.
2/ After
draining the engine, remove one of the hot water tank hoses from the top front
of the engine. Keep the 2 coolant drains on the engine open. Put on the
radiator cap and put your finger over the opening on the engine where the hot
water heater hose was connected. Clean off the hot water heater hose and then
blow on the hose and the hot water heater loop is emptied (about 1/2 gallon).
3/ Remove and clean the
overflow tank. It pulls straight up off of its mounting bracket.
4/ Close all drains and fill with water.
Replace filler cap. Run engine until thermostat opens and temperature
stabilizes. Then shutdown and allow to cool.
5/ Drain
(ie. Repeat step 1) Refill with coolant
system flush chemical (optional) plus water as required to fill. Run engine until thermostat opens. Shutdown
and allow to cool.
7/ Drain (ie. Repeat step 1) Refill with water
to flush out the cleaning chemical (ie. Repeat step 3). Do this 3 or 4 times
until drained water is clean and free from ethylene glycol (green) antifreeze.
Note: if you are staying with
the EG antifreeze or did not use the flush chemical, 1 or 2 water flushes
should be sufficient.
8/ Drain for the last time. Refill
with the 50/50 mix of Dexcool-type extended life antifreeze. Fill overflow tank
slightly above the min mark.
9/ Start engine, check for
leaks and proper temperature. After shutdown, recheck level in overflow tank.