cat60y

Tanabe Air compressor, When MAC started, Smoke came out of the crankcasee indicating Blowpass.

initial troubleshootings
1) piston ring broken

Changed all the piston rings and inspection of liner. All okay.

& it turns out there is a broken oring on the piston pin on tanabe MAC, which not everyone knew of or change during major overhaul.

All refrigeration system works like this

Compressor( High pressure, Hot gas refrigerant) > Condenser ( High pressure, Cooled liquid refrigerant) > Drier > Thermo expansion valve ( Low pressure, Cold liquid refrigerant) > Evaporator (Heat exchange takes place here, Low pressure, Hot Gas/Liquid refrigerant) > Compressor

Common problems i can…[Read more]

One of the PSC / Class checks is checking if the reverse power reley is working.

How to check is… to run 2 generator on synchronise.

Changed the switch to manual, reduce the governer on the switchboard to reduce the load until negative. The generator should trip.

Do no scare! Scare no do ! >:)

Slow is smooth, smooth is fast, fast is lethal !

Understood from the above that Evaporated seawater meaning our distilled water generated from fresh water generator.

Ive only know of 2 chemical suppliers, DREW MARINE & UNITOR

For Unitor, jacket water treatment are using Natfleet to increase Nitrate levels. Nitrate levels are best kept above 1200.

If found faulty, some may want to replaced as a whole provided there is a spare.

If not if taking out for cleaning for routine maintenance, cleaning the piston(25), check the condition of the gasket on the valve disk(10).
Make a marking on the body before dismantling, as the center body consists of 2 different holes passage, 1 from inlet to the…[Read more]

Isolating valves

In the case of leakage area as shown above, Low low level alarm will be activated. When the alarm is activated, Both isolating valve will be activated & No.1 Lo pump will be switched over to No.2 pump.

4 Rams system work in a Pair. Thus when #4 Ram pipe is leaking, #3 & #4 ram is then isolated.

Through Lo #2 pump and only…[Read more]

From the above Unloader, the left box is when the steering is in operation and the left is for unloading.

The left box consist of 2 check valves, when in operation, the left check valve opens and prevents the return of the oil, and the right check one for the returned oil is opened by the left line, thus allowing the flow back.

Relief valve…[Read more]

Operations of 4 Ram Steering gear

1)Steering gear pump is uni directional. During idle mode, there are no pumping stroke.
2)When torque motor sense signal from bridge, the directional control valve will operate to the direction by bridge and pump will be put to stroke.
3)After 10-20sec of starting, the unloading device will activate and pilot…[Read more]

Performance

1) Taken once a month, to check all is well, Pmax and Pcom is normal range, no abnormalities.
2) Normally i would take performance when changing over. For example this week AE #1 and im changing over to AE#2, i will take both performance at ~85% load. Depend on your company requirement.
3) Next week, when i’m changing from Ae#2 to…[Read more]

Routine job for 3e

Tappet clearances
1) 2 rounds of your Flywheel is complete cycle of your 4- stroke generator, so for you to finish your tappet you just need to turn 2 rounds. Each round 3 units to adjust.
2) flywheel got 3 locations and marking; 1/6, 2/5, 3/4. 1st round of turning flywheel ( adjust the unit which both exhaust and suction…[Read more]

When taking over,

1) Just know the essential valves for your generator. How many valves to top up your sump oil. How much consumption of Lub oil per month. Normally 100 – 300 for 3 generator depend on running hour.
2) How many valves to close when overhauling. Mainly where the FO valves, cooling water valves to close and where to drain,…[Read more]