Yanmar 1GM User Manual page 58

52
CHAPT ER T H REE
SACRIFICIAL ANODE
ORIGINAL SIZES
1 GM AND 1GM10 MODELS
T
mm
Di n.)
~
i+-
~O
mm
(0.801n.)+
20
(0.8
2GM, 2GGM20, 3GM, 3GM30, 3HM
AND 3HM35 MODELS
-
t
20mm
(0.80 In.)
~
-
.-
30mm J
(2.00 In.)
•
'-
,
6. Rea ssemble and reinstall the sa crific ial ano de in the
engine .
2GM, 2G.U20. 3GM , 3 GM JO,
3HJI ami 3HM35 models
,VOTE
Do not apply any sealer
to
the anode mount-
ing plate or
10
the engine block. Sealer or
corroded mating surfaces will prevent good
electrical
CUIIlact,
which is necessary for
optimum anode protection.
2. Unscrew the mou ntin g plate (Figu re 18) and remove
the sacrificial anode ( Fi ~ u re 21).
3. Usc a wire brush and remove corrosion on the anode.
Clean the mounting plate and mounting surface on the en -
gine block.
4. Inspccr rhe anode and compare
it
with the dimensions
ora new anode shown in
Ftgure 22. Replace the anode if
dimensions are less than 50 percent of original size.
5. Install a new gasket on the anode (Figur e 23 ).
I. Drain the cooli
ng system.
2. Unscrew the sacrificial anodes in the cy linder head
( Figu r e 19) and cy linde r block (Fil:,u re 20).
3. Use a wire brush to remove corrosion from the
anode.
Clean the threads on the anode and in the engine.
4. Inspect the anode and compare it with the dimension. s
ofa new anode sho.....
-n
in Fi 2u re 22 . Replace the anode if
d imensions are less than 50 percent of original size .
5. Install a new gasket on the anode (F igu re 23).
which is necessaryfor optimum anode pro-
tection.
6. Reas semble and reinstall the sacrificial anode in the
engine.
COO I.I ' G S YST D ·I
NOTE
Do not apply any seater to threads on the
anode or in the eng ine. Sealer or corrode d
threads will preve nt good electrical contact.
Refe r to C hap ter Eig ht for a desc ription of the two types
of coo ling sys tems that are used on the Yanmar ma rine
diesel engines covered in this manual. A fresh water