W-seat Technology
Cost effective performance
W-seat technology
Extended TBOs and Longer Lifetimes
The introduction of this cost-effective W-seat has The W-seat can be used on all types of MC engines
made it possible to reduce the price while simulta- as well as the majority of earlier designs of MAN B&W
neously increasing the expected time between over- two-stroke engines, regardless of the spindle type.
hauls, as well as significantly increasing the expected
total number of hours in service.
Original Quality Spare Parts from MAN Diesel
Minor gas leakages and dent marks are no longer to ssure Your Company:
A
be considered harmful, and can be disregarded when
evaluating the condition of the seats. Latest design and knowledge built in
High-quality, reliable spares
So far, running hours of up to 40,000 hours have MAN Diesel quality assurance
been obtained without needing to grind the seat. Extended guarantee on certain parts
Further, reports from vessels in service confirm the Readily available, worldwide
generally extended mean time between overhauls of
the valve seats. Just as trading under difficult conditions requires
first class personnel, so does machinery require first
It should also be noted that in order to obtain the class maintenance and spares. The main engine is
full benefit of the prolonged time between overhauls, only as reliable as the spare parts installed. Do not
MAN Diesel recommends using a premium type of reduce the reliability of your vessel by allowing non-
sealing ring between the exhaust valve and the cylin- original, low-standard parts on board.
der cover. If problems are found in this respect, MAN
Diesel can supply newly developed seals, instead of
the previously used O-rings. For more information,
contact our Spare Parts Department.
The successful adoption of the W-seat by the market confirms the many years of
research and development work, both in scientific tests and long-term in-service trials.
This latest generation of valve seat has further im on the next page show, this is achieved without giv-
proved the overall conditions of the seat contact ing rise to any appreciable dent marks.
area, leading to increased time between overhauls.
In order to meet the requirements for high strength,
The key to the new geometry of the W-seat is the two the W-seat is made from solid, low-alloy steel, with
narrow concentric contact areas. The effect of these an induction hardened seating surface. This inno-
narrow contact areas is to crush and squeeze out vation also results in a considerable economical
all carbon particles which are trapped between the advantage — saving the expense of welding a costly,
spindle and the bottom piece. As the photographs hard-facing material onto the seat. The spindle and seat had both been in operation for over 36,000 hours and are still in perfect service condition
MAN B&W Diesel
2 W-Seat – Increasing TBOs W-Seat – Increasing TBOs 3
Copyright © MAN Diesel · Subject to modification in the interest of technical progress. · 1510-0010-02ppr August 2009 Printed in Denmark
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www.mandiesel.com
Spare Parts
(Two-stroke)
Phone +45 33 85 11 00
Fax +45 33 85 10 49
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Emergency phone – after office hours:
+45 40 19 35 01
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Emergency phone – after office hours:
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Denmark
Phone +45 33 85 11 00
Fax +45 33 85 10 16
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