Isuzu 25 - Page 8

14
15
(h) Run the engine on one third speed for 15 minutes, preferably with the boat
tiedup.Asthesystemwarmsupcoolantmaybeexpelledfromtheoverow
pipe into the bilge. Stop the engine and allow the engine to cool down
before removing the pressure cap and top up the coolant to 25mm below
thellerneck.
Important
Removal of the pressure cap when the engine is hot can cause severe injury from
scalding hot water under pressure. Always allow the engine to cool and then
use a large cloth when turning the cap anti-clockwise to the stop. This allows
the pressure to be released. Press firmly down on the cap and continue to turn
anticlockwise to release the cap.
(i)Repeat(h)ifcoolantlevelismorethan25mmbelowthebaseoftheller
neck when the engine has cooled down.
(j) Run engine on
2
/
3
speed for 20 minutes, check for leaks and repeat (i)
(k) Anti-freeze solutions should be drained off every 500 hours or 2 years which
ever is sooner, and replaced with a new solution.
Enginewaterller
cap, integrated into
the header tank.
Enginewaterller
cap, integrated into
the header tank.
Note: it is best to have a plastic bag wrapped around the filter to catch any oil
left in the system. (Always keep your bilges clean!) Before screwing in the new
filter spread a thin film of oil round the rubber gasket to ensure a good seal and
screw in – hand tight.
4. Filltheenginewithnewoil,refertopage11forspecication,asdescribed
above.
Note: once you have re-filled the engine will oil, run the engine for about 5
minutes, so the oil can be pumped around the engine and into the new filter.
Stop the engine, and let it settle for about 10 minutes, and re-check the oil level,
fill if required.
Changing the fuel lter
1. Thefuellterisaspintype.Removeby
turning anti-clockwise when viewed
from below, see picture
2. Replacethefuelltercartridgeevery500hours.
3. Apply fuel oil thinly over the gasket
and tighten into position – hand tight
4. Turn key to position ‘RUN’ and allow electric
fuelliftpumptopumpfuelintolter.
5. Check for leaks
Note: Do not get fuel on the flexible mounts.
Checking Gearbox Oil Level – please refer to gearbox manual
Freshwater system
New engines are supplied with the freshwater drained off. The following
instructions must be followed to fill the system.
(a) Mix up in a clean bucket the correct strength of anti-freeze solution.
(b) Check that the drain tap or plug is turned off.
(c) Fill engine with freshwater/anti freeze solution through the top of the header
tankwiththellercapremoved.
(d)Filltheheadertanktothetopofthellerneckandreplacecap.Pressdown
rmlyonllercapandhandtighteninaclockwisedirection.
Note: for keeled cooled engines a much larger quantity of freshwater/anti
freeze solution is required depending on the size of the keel cooling tank
– refer to the builder.
(e) run the engine for 5 minutes on no load (out of gear) and check coolant
level. Top up if necessary.
(f)Checksystemsforleaks,includingcaloriercircuitiftted.
Note: for keel cooled engines it is very important to bleed all the air out of the
system before the engine is run on load (check with builders instructions).
(g)Ifacalorieristtedcaremustbetakentoseethatthisisalsofull
ofcoolantandalltheairisexpelled.(seecalorierttingnotesunder
installation section)