Valve Cover; Breather Assembly - Yanmar 1GM User Manual

SINGLE-CYL IN DE R ENG INES
1. Never place any part o f your body where a movin g or
fallin g engine may trap.
CUI
or crush you.
2. If y ou mu st push the engine during removal, use a
boa rd or similar tool to keep your hands out of danger.
3. Make sure the hoist is designed to
lin
engines and has
eno ugh load capacity for your engine.
4. Make sure the hoist is sec urely attached to safe lifting
points on the engine.
5. The engine should not be diffi cult to lift with a proper
hoist. If it is. stop lifting. lower the eng ine back onto its
mounts and make sure the eng ine has been completely
separated from the vessel .
Remcval/t nstetla rton
While specific procedures cannot address all engine in-
stallations. refer to the following general instructions
when remo ving the engine.
1.
Disco nnect the negat ive bat tery cable.
2. C lose the seacock and drain the coo ling system as de-
scribed in Chapter Four.
3. Disconnect the intake water hose from the seawater
cooling pump .
71
4. C lose the fue l shuto ff valve and disconnect the fuel
line and the fuel return line.
5. Disconnect the remote contro l cab les.
6. Disconnect the elec trica l wiring harne ss connectors.
7. Disconnect the electrical wires from the electric starter
motor and so leno id that will interfere with engine re-
moval.
8. Detach the ex haust system.
9.
Detach the dri veshaft from the transm ission o utput
5
flange.
10. Remove the engine retaining bo lts.
II . Remove the engi ne and trans miss ion.
12.
Rem ove the tran smission from the engine as de-
scribed in Chapter Ten.
13. Eng ine installation is the revers e ofrem oval, plus the
follow ing:
a . Tighten the engine mounting bolts sec urely.
b. Sec urely tighten the output flange-to-driveshaft
bolts.
e. Bleed the fuel sys tem at the fue l filter as described
under Fuel Filter in Chapter Th ree.
VALVE COVE R
Refer 10
FI ~ uTe
5.
To remove the valve cover, proceed as follows:
I. Make sure the decompression lever is in the O FF posi-
tion .
2. Unsc rew the retaining nut (F igu re 6).
3. Remove the valve cover.
4. Rem ove the gasket.
5. C lean the gaske t surfaces on the va lve cover and cylin-
der head .
6. Reverse the removal steps to insta ll the valve cover. Be
sure 1 0 installthe breat her pipe (19, Figure 5).
BR EATH ER ASS E ~I BLY
A reed-type breather is located in the valve cover. Refer
to Chapter Three for a description o f breather operation .
To service the reed portion of the brea ther, remove the
breath er cover (F igure 7). Th e
reed (F
igu re 8) should lie
flat. Replace the reed if it is split, cracked or otherwise
da maged .
Check the oil return hole (F igure 9) inside the breather
chambe r in the va lve cover.
If the
hole is obstructed. re-
mo ve the valve co ver and clean out the hole .