ME ENGINES AIR STARTING VALVE O'HAUL PROCEDURES
Summary
TLDRThis 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
- đ§ 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.
- â± Maintenance of the starting air valves is required every 12,000 running hours for engines with a cylinder bore of 50 to 70 centimeters.
- đ ïž The valve must be removed from the cylinder head, placed horizontally, and the top cover with eight Allen bolts unscrewed for maintenance.
- đš A marking should be made to identify the position of the top cover for correct reassembly.
- đ© The piston is secured to the spindle by two screws, which are held in place by a locking device that needs to be removed.
- đ After removing the piston and spring, carbon deposits should be cleaned off the piston using a wooden piece.
- đ§Œ All disassembled parts must be thoroughly cleaned using clean diesel oil.
- đ ïž The valve housing seating may need grinding or lapping depending on its condition, using grinding paste and lapping techniques.
- đ Post-laping, a surface contact test is conducted to ensure perfect sealing between the valve spindle and housing.
- đ€ Reassembly includes lubricating all internal parts with molybdenum disulfide and correctly positioning the piston and locking device.
- đ§ A leak test with clean diesel oil is essential to check the valve spindle's seal against the valve housing.
- đ 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
đ§ 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.
đ 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.
Mindmap
Keywords
đĄUPS
đĄEngine Room Control Console
đĄAir Starting Valve
đĄCylinder Bore
đĄMaintenance Schedule
đĄAllen Bolts
đĄPiston
đĄCarbon Deposition
đĄLapping
đĄMolybdenum Disulfide
đĄLeak Test
đĄFunction Test
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
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