Yanmar 2YM15 Service Manual download pdf (Page 61)

2. Inspection and adjustment

4) Nozzle punch mark

(3) Check the impeller of the cooling water pump (seawater pump)

The impeller must be replaced with new one periodically (every 1000 hrs or four years whichever comes

first).

Refer to 2.2.5 (5) for the procedure.

(4) Clean & check the water passages

When it is used for a long time, cleaning of the cooling water passages is periodically necessary,

because trash, scales, rust, and so on collect in the cooling water passages and the cooling performance

declines.

(a) Cleaning and inspection of cooling water rubber hoses.

1) Remove the cooling water rubber hoses for the fresh water line and the seawater line.

2) Check the dust and trash inside the hoses. If necessary, clean it.

3) Check the crack and the deterioration of the rubber hoses. If necessary, replace with new ones.

4) Replace the used hose clips with new ones, if necessary.

(b) Heat exchanger inspection

1) Cooler core inspection

a) Inspect the inside of the tubes for rust or scale buildup from seawater, and clean with a wire brush

if necessary.

NOTE: Disassemble and wash when the cooling water temperature reaches 85°C.

b) Check the joints at both ends of the tubes for looseness or damage, and repair if loose, Replace if

damaged or corroded

c) Check tubes and replace if leaking.

d) Clean any scale or rust off the outside of the tubes.

2) Heat exchanger body inspection

a) Check heat exchanger body and side cover for dirt and corrosion. Replace, if excessively

corroded, or cracked.

b) Inspect seawater and fresh water inlets and outlets, retighten any joints as necessary and clean

the insides of the pipes.

c) Check the exhaust gas intake flange and line, and replace if corroded or cracked.

NP - DN O P D N159

Design code

BOSCH

Type: pintle type

Injection angle

Size: size P

Throttle type

Identification

number

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 230 231

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Yanmar 2YM15 Service Manual Page 61