Search found 60 matches

by Pengze
Thu Oct 30, 2008 4:30 am
Forum: The Workshop
Topic: SW in Diesel Tanks
Replies: 1
Views: 3182

Re: SW in Diesel Tanks

Hi Marine Engineers out there! First & foremost, pls find the source of contamination of salt water in diesel. Prevention is better than cure. No matter how efficient the centrifuging separation is, the culprit is still inside there causing havoc to the purifier & engine. Remember the separa...
by Pengze
Thu Oct 30, 2008 4:16 am
Forum: The Workshop
Topic: Step-type exhaust valve seat
Replies: 2
Views: 4417

Re: Step-type exhaust valve seat

Hi Sebastian! Thks for yr comment. But I am sorry that you could be getting my message wrong. Anyway this is interesting. What I mean by step-type valve seat is that the seat has a long skirt (sorry I didn't have the picture). Usually you can find in Mirrlees Blackstone medium speed engine. Previous...
by Pengze
Sun Oct 26, 2008 6:42 am
Forum: The Workshop
Topic: Step-type exhaust valve seat
Replies: 2
Views: 4417

Step-type exhaust valve seat

Hi Everyone!
For a medium speed diesel engine, what advantage do the step-type exhaust valve seat (nimonic & stellited) has over the plain-type (no step) valve seat?
Any specific reason for the design of step-type exhaust valve seat ? Thank you in advance.
by Pengze
Tue Oct 21, 2008 6:30 am
Forum: The Workshop
Topic: How to explain hydrolock in a diesel engine?
Replies: 17
Views: 54047

How to explain hydrolock in a diesel engine?

Actually what is a hydrolock? And how does it happen? Can the hydrolock damage the engine piston & con-rod?
Does the defective fuel pump anything to do with the hydrolock problem?
Kindly explain in details & thank you.
by Pengze
Tue Oct 21, 2008 6:21 am
Forum: The Workshop
Topic: Stern tube weardown & rudder jumping clearance
Replies: 3
Views: 32217

Re: Stern tube weardown & rudder jumping clearance

Thank you, Madzng.
As for oil lubricated bearings, if the weardown is excessive, could I shift the liner or the seal seating positions. What is the procedure & how to do it ?
Looking forward to your reply.
Have a nice day.
by Pengze
Sat Oct 18, 2008 7:08 am
Forum: The Workshop
Topic: Stern tube weardown & rudder jumping clearance
Replies: 3
Views: 32217

Stern tube weardown & rudder jumping clearance

I would be happy if somebody can enlighten me on the following details: 1. What is the allowed maximum weardown for stern tube tailshaft bearings? Could I use vernier caliper (depth gauge) instead of poker gauge for this weardown measurement? 2. What is the allowed maximum jumping clearance for a se...
by Pengze
Sat Oct 11, 2008 1:15 am
Forum: The Workshop
Topic: Looking for leaks...
Replies: 2
Views: 3974

Re: Looking for leaks...

Oh my God! Pretty scary. This case is only the tip of the iceberg. I do agree about the comment regarding the term 'sister ships'. The unscrupulous cut corners by saving money when they abuse the real meaning of sister ships whereby they use the stability of the other sister ship to apply on the nex...
by Pengze
Sun Oct 05, 2008 2:27 am
Forum: The Workshop
Topic: STERN SHAFT & ENGINE ALIGNMENT
Replies: 2
Views: 3987

Re: STERN SHAFT & ENGINE ALIGNMENT

Hi JK,
Not for exam purpose. Basically & technically for hands -on approach for installation of the above.
Hope somebody who had this experience before can enlighten & kindly provide info for our marine engineers' community.
Any specialist out there? I would like to hear from you. Thanks.
by Pengze
Fri Oct 03, 2008 5:43 pm
Forum: The Workshop
Topic: STERN SHAFT & ENGINE ALIGNMENT
Replies: 2
Views: 3987

STERN SHAFT & ENGINE ALIGNMENT

Good day! Regarding the alignment for stern shaft with reduction gearbox and marine engine, what is the standard allowable deviation for axial & radial measurement? Where can I find the torque for tightening the holding down bolts for the reduction gearbox & marine engine (I mean other than ...
by Pengze
Fri Oct 03, 2008 3:28 am
Forum: The Workshop
Topic: ENGINE JACKETWATER'S EXPANSION(HEADER)TANK
Replies: 9
Views: 19068

Re: ENGINE JACKETWATER'S EXPANSION(HEADER)TANK

Dear Mr.Martin,
Thank you very much for your help.
It certainly helps.
Have a nice day.
by Pengze
Tue Sep 30, 2008 11:30 pm
Forum: The Workshop
Topic: VESSEL'S BASE LINE VERIFICATION
Replies: 2
Views: 3729

VESSEL'S BASE LINE VERIFICATION

Hi there! May I know what is the proper or correct way for determining the ship's (newbuilding) base line? Is the 'water level' gauging method (by filling up a small diameter transparent hose with water) and then bringing the hose along to some certain pre-determined points from a set point to ascer...
by Pengze
Tue Sep 30, 2008 11:17 pm
Forum: The Workshop
Topic: ENGINE JACKETWATER'S EXPANSION(HEADER)TANK
Replies: 9
Views: 19068

Re: ENGINE JACKETWATER'S EXPANSION(HEADER)TANK

Dear Mr.Martin,
Appreciate your effort. What is the value of the 'gravity' as in the engineering formula?Thanks & looking forward to your kind reply.
With Best Wishes from me.
by Pengze
Sun Sep 28, 2008 4:49 pm
Forum: The Workshop
Topic: Reversible Reduction Gear for Marine Diesel Engine
Replies: 2
Views: 5120

Re: Reversible Reduction Gear for Marine Diesel Engine

Hello,
Basically, the marine reversible reduction gearbox is either horizontal or vertical offset gearing c/w thrust pads inside.
Usually you can get the details / pictures from the gearbox manufacturer.
by Pengze
Fri Sep 26, 2008 5:21 am
Forum: The Workshop
Topic: ENGINE JACKETWATER'S EXPANSION(HEADER)TANK
Replies: 9
Views: 19068

Re: ENGINE JACKETWATER'S EXPANSION(HEADER)TANK

Hello Gentlemen, Thank you very much for your kind info. I would like to clarify once again, whether the tank height is calculated from the suction of the pump inlet OR from the jacketwater outlet / discharge manifold of the engine ? Because there is some dispute among my colleagues. As to the phras...
by Pengze
Tue Sep 23, 2008 10:01 pm
Forum: The Workshop
Topic: ENGINE JACKETWATER'S EXPANSION(HEADER)TANK
Replies: 9
Views: 19068

ENGINE JACKETWATER'S EXPANSION(HEADER)TANK

Hello, Could anyone tell me, is there a formula or minimum & maximum height for installing diesel engine's jacketwater (freshwater)expansion (header) tank in the engine room? Also, what is the reserve capacity for the header tank which caters for an engine whose total capacity is 800 litres &...