ME ENGINES AIR STARTING VALVE O'HAUL PROCEDURES

Summary

This instructional video outlines the maintenance procedures for the air starting valve on a MAN BMW 6S60 MEC 8.2 main engine. It guides viewers through the process of disassembling, cleaning, lapping, and reassembling the valve after every 12,000 running hours. The tutorial emphasizes the importance of a leak test and function check to ensure the valve operates correctly. Stay tuned for the next video on troubleshooting engine alignment errors.

Takeaways

• 🔧 The video provides a guide on how to overhaul an air starting valve on the cylinder heads of MAN B&W 6S60 MEC 8.2 main engines.
• ⏱ Maintenance of the starting air valves is required every 12,000 running hours for engines with a cylinder bore of 50 to 70 centimeters.
• 🛠️ The valve must be removed from the cylinder head, placed horizontally, and the top cover with eight Allen bolts unscrewed for maintenance.
• 🔨 A marking should be made to identify the position of the top cover for correct reassembly.
• 🔩 The piston is secured to the spindle by two screws, which are held in place by a locking device that needs to be removed.
• 🌐 After removing the piston and spring, carbon deposits should be cleaned off the piston using a wooden piece.
• 🧼 All disassembled parts must be thoroughly cleaned using clean diesel oil.
• 🛠️ The valve housing seating may need grinding or lapping depending on its condition, using grinding paste and lapping techniques.
• 🔍 Post-laping, a surface contact test is conducted to ensure perfect sealing between the valve spindle and housing.
• 🤏 Reassembly includes lubricating all internal parts with molybdenum disulfide and correctly positioning the piston and locking device.
• 💧 A leak test with clean diesel oil is essential to check the valve spindle's seal against the valve housing.
• 📊 A functional test involves using a special adapter tool, connecting service air, and ensuring the valve opens approximately 15 to 20 mm.

Q & A

What is the purpose of the video?

The video provides a detailed procedure for overhauling an air starting valve installed on the cylinder heads of MAN B&W 6S60 MEC 8.2 main engines.

Why is it important to have a continuous 24-volt DC supply to the main engine remote control systems?

A continuous 24-volt DC supply is crucial for maintaining the functionality and reliability of the main engine remote control systems.

How often should the starting air valves be overhauled according to the maintenance schedule?

The starting air valves on a 50 to 70 centimeter cylinder bore of M engines should be overhauled after every 12,000 running hours.

What is the first step in the overhaul process of the air starting valve?

The first step is to uninstall the valve from the cylinder head and bring it to the workshop.

How many Allen bolts need to be unscrewed to remove the top cover of the valve?

Eight Allen bolts need to be unscrewed to remove the top cover of the valve.

What is the purpose of the locking device on the screws that secure the piston to the spindle?

The locking device prevents the screws from loosening and ensures the piston remains securely attached to the spindle.

What should be used to clean the valve housing and other parts after dismantling?

Clean diesel oil should be used to clean the valve housing and other parts to remove any deposits.

What is the purpose of grinding or lapping the valve housing seating?

Grinding or lapping the valve housing seating is done to ensure a perfect seal between the valve spindle and the valve housing, depending on its condition.

How can you ensure perfect sealing between the valve spindle and the valve housing after lapping?

A surface contact test should be conducted to ensure perfect sealing between the surfaces of the valve spindle and the valve housing.

What is the importance of the leak test and operation check after assembling the valve?

The leak test and operation check are important to ensure the valve is functioning correctly and there are no leaks in the valve spindle's seal with the valve housing.

What is the expected opening range of the valve during the function test?

The valve should open approximately 15 to 20 mm during the function test.

What is the next topic the video creator plans to cover in an upcoming video?

The next topic will be troubleshooting the M engines Taco alignment error problem.

Outlines

00:00

🔧 Maintenance of Air Starting Valve on M Engines

This paragraph outlines the maintenance procedure for an air starting valve on a man BMW 6s60 MEC 8.2 main engine. The process involves removing the valve from the cylinder head, disassembling it, cleaning all parts, and grinding or lapping the valve housing seating. It emphasizes the importance of a perfect seal between the valve spindle and housing, and the need for lubricating internal parts with molybdenum disulfide. The reassembly process is detailed, including the use of a locking device and securing screws to ensure the piston is tightly compressed against the spindle.

05:01

🚀 Post-Maintenance Leak Test and Functional Check

The second paragraph focuses on the post-maintenance leak test and functional check of the air starting valve. It instructs to check for leaks by pouring clean diesel oil through the ports and to re-lap the valve if leaks are detected. A special adapter tool is used for the function test, where the valve's opening is verified with a service air supply. The paragraph concludes with the readiness of the valve for reinstallation on the cylinder head and a teaser for an upcoming video on troubleshooting a TACO alignment error problem in M engines.

Keywords

💡UPS

UPS stands for Uninterruptible Power Supply, which is a device that provides emergency power to a load when the input power source or mains power fails. In the context of the video, it is crucial for maintaining a continuous 24-volt DC supply to the main engine remote control systems, ensuring that the engine can be controlled reliably even in the event of a power failure.

💡Engine Room Control Console

The engine room control console is a central location where the operation and monitoring of a ship's engine can be managed. It is an integral part of the video's theme as it discusses the procedures to maintain the UPS for the remote control systems, which are likely to be interfaced with this console.

💡Air Starting Valve

An air starting valve is a component installed on the cylinder heads of main engines, which is used to control the intake of air for starting the engine. The video describes the procedure to overhaul this valve, which is essential for the proper functioning of the MAN BMW 6S60 MEC 8.2 main engines.

💡Cylinder Bore

The cylinder bore refers to the internal diameter of a cylinder in an engine where the piston moves. In the script, it mentions that the starting air valves on engines with a 50 to 70 centimeter cylinder bore need to be overhauled after every 12,000 running hours, indicating the importance of regular maintenance based on the engine's size.

💡Maintenance Schedule

A maintenance schedule outlines the routine checks and services required to keep machinery in good working order. The video script emphasizes the importance of following a maintenance schedule for overhauling the starting air valves, which is a critical aspect of engine maintenance.

💡Allen Bolts

Allen bolts, also known as hex bolts, are a type of screw that is driven by a hexagonal socket. In the context of the video, the script instructs to unscrew the top cover using eight Allen bolts, which secures the valve in place during the overhaul process.

💡Piston

A piston is a component of the valve that moves back and forth within the valve housing, controlling the flow of air or gas. The video describes the procedure to remove and clean the piston, which is a crucial step in the valve overhaul process.

💡Carbon Deposition

Carbon deposition refers to the buildup of carbon residue within an engine or its components, which can affect performance. The script mentions that there is always carbon deposition on the piston, which needs to be cleaned off using a wooden piece, highlighting the importance of cleaning in the maintenance process.

💡Lapping

Lapping is a precision finishing process that smooths and polishes the surfaces of two mating parts to ensure a tight fit and proper sealing. The video script describes the need to grind or lap the valve housing seating, which is essential for ensuring the valve operates correctly after being reassembled.

💡Molybdenum Disulfide

Molybdenum disulfide is a solid lubricant known for its high-pressure lubricating properties. The script instructs to lubricate all internal parts and sliding surfaces with molybdenum disulfide, which helps in reducing friction and ensuring smooth operation of the valve.

💡Leak Test

A leak test is a procedure used to check for the presence of unwanted leaks in a system. In the script, it is mentioned to perform a leak test on the overhauled valve by pouring clean diesel oil through the ports to ensure the valve spindle seals perfectly with the valve housing, which is a critical step in verifying the valve's functionality.

💡Function Test

A function test is conducted to verify that a component or system operates as intended. The video script describes a function test for the valve by installing a special adapter tool and checking if the valve opens to the correct dimensions, which confirms the valve's proper operation after the overhaul.

Highlights

Introduction to the video on renewing the UPS batteries for the main engine remote control systems.

Importance of continuous 24-volt DC supply for main engine remote control systems.

Link to Sim provided for further information.

Overview of procedures for overhauling an air starting valve on cylinder heads of MAN B&W 6S60 MEC 8.2 main engines.

Maintenance schedule for overhauling starting air valves every 12,000 running hours.

Instructions for removing the valve from the cylinder head and bringing it to the workshop.

Steps to unscrew the top cover and remove the piston and spring from the valve housing.

Mention of carbon deposition on the piston and its removal using a wooden piece.

Emphasis on thoroughly cleaning all parts with clean diesel oil.

Guidance on grinding or lapping the valve housing seating depending on its condition.

Demonstration of conducting a surface contact test between the valve spindle and housing.

Assembly instructions including lubricating parts with molybdenum disulfide.

Procedure for installing the spring and piston back onto the spindle.

Instructions for tightening and locking the screws with a locking device.

Importance of checking the overhauled valve for leaks and its operation.

Method for conducting a function test of the valve using a special adapter tool.

Upcoming video teaser on troubleshooting the M engine Taco alignment error problem.

Call to action for subscribing to the channel and sharing the video among peers.

Closing remarks with well-wishes for safe seas and a healthy stay on board.

Transcripts

Hello friends hope my previous video

detailing the procedures to renew the

amazing's remote control systems UPS

batteries in the engine room control

console is well understood and you have

replaced the audio batteries on your

system

if at all you have missed to watch the

video please go through it as it is

crucial to have the continuous 24 volt

DC supply to the main engine remote

control systems

the link for Sim is attached on the

screen

in this video I'll describe you the

procedures to overall an air starting

valve installed on the cylinder heads of

the man BMW 6s60 MEC 8.2 main engines

so friends let's get started

[Music]

as per the maintenance schedule the

starting air valves on a 50 to 70

centimeter cylinder bore of M engines

needs to be overall after every 12 000

running hours

uninstall the valve from the cylinder

head and bring it to the workshop

place the valve in horizontal position

and unscrew the top cover eight Allen

bolts

make a marking to identify the position

while assembling back the top cover

then remove the top cover

you will get access to two screws

tightening the Piston to the spindle

both the screws are secured by a locking

device

remove this locking plate

install two jacking bolts on the air

piston and pull out the Piston from the

top end of the valve housing

then remove the spring from the valve

housing

there is always a carbon deposition on

the piston

so type the Piston with a wooden piece

and remove it from other end

after dismantling all the parts you need

to thoroughly clean every item

use clean diesel oil to clear the

deposits once the valve housing and all

other parts are cleaned you need to

grind or lap the valve housing seating

depending on its condition

apply grinding paste carbon random

number 200 on the sitting surfaces and

Carry Out lapping of the spindle and the

valve housing as shown in the video

use a face wrench to rotate the spindle

thoroughly inspect both The Mating

surfaces for any uneven marks or

scratches

once lapping is done you need to ensure

perfect ceiling between the surfaces of

the valve spindle and the valve housing

for this conduct the surface contact

test as shown in the video

here you can see an absolute contact

between both the surfaces

now we are ready to assemble back all

the valve parts

do lubricate all the internal parts and

sliding surfaces with molybdenum

disulfide

first insert the valve spindle in the

valve housing

then install the spring in the housing

do align the two holes on the air piston

and the valve spindle and install back

the piston on top of the spindle

once the Piston is in correct position

fit the Locking device and the two

securing screws

when tightening the screws the Piston

will compress the spring

tighten the screws continuously until

the Piston faces tightly against the

spindle

then lock the screws with the Locking

device

Mount and tighten the top cover

guys the next step is very important

always do check the overall valve for

the leak test and its operation

pour a small quantity of clean diesel

oil through the ports to ensure the

valve spindle is sealing perfectly with

the valve housing

if at all the oil leaks through the

sitting surfaces do dismantle and lap

the valve again

for conducting the function test of the

valve install a special adapter tool on

the control air Inlet line

connect a supply of service air and

check the valve opens approximately 15

to 20 mm

repeat the steps couple of times

diastatic valve is now ready to be

installed back on the cylinder head

friends in my upcoming video I'll

describe you the procedures to

troubleshoot the M engines Taco

alignment error problem which I had

faced recently

guys it's honestly worth watching

so do stay connected with my channel by

subscribing it now

also if you have found the content of

this video informative

don't forget to hit the like button and

do share it among your friends to make

us all a better engineer on board the

vessel

thank you for watching the video

wish you all safe seas and healthy stay

on board

thank you

foreign