SL2012-554.pdf
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Service Letter SL12-554/JAP
Action code:
WHEN CONVENIENT
Heavy Duty Piston Ring
Pack
SL12-554/JAP
January 2012
Concerns
Owners and operators of MAN B&W
two-stroke marine diesel engines.
Type: MC/MC-C/ME/ME-C/ME-GI with
CPR-CL ring pack coniguration.
Dear Sirs
Since 2006 we have been using a piston ring coniguration on 98,
90 and some 80 bore engines with cermet hard coating on the liner
running surface of the 1st and 4th piston rings, combined with chro-
mium on the lower face of the 1st and 2nd piston rings.
Summary
New alternative ring pack coniguration
for 60-65-70 bore and S/K80 Mk 8, and
lower, two-stroke diesel engines.
The service results have been very good, and we have seen many
advantages that we would like to offer as an alternative to the stan-
dard ring pack coniguration for our other CPR-CL top ring.
We therefore introduce an alternative heavy duty ring coniguration,
which is similar to the large bore ring pack standard.
This coniguration can be utilised by owners and operators wishing to
improve the mean time between overhaul or, in special applications,
where the cylinder condition would beneit, for example in connec-
tion with utilising low-sulphur fuel operation.
Yours faithfully
Mikael C Jensen
Vice President, Engineering
Stig B Jakobsen
Senior Manager, Operation
Head ofice (& postal address)
MAN Diesel & Turbo
Teglholmsgade 41
2450 Copenhagen SV
Denmark
Phone: +45 33 85 11 00
Fax: +45 33 85 10 30
info-cph@mandieselturbo.com
www.mandieselturbo.com
PrimeServ
Teglholmsgade 41
2450 Copenhagen SV
Denmark
Phone: +45 33 85 11 00
Fax: +45 33 85 10 49
PrimeServ-cph@mandieselturbo.com
Production
Teglholmsgade 35
2450 Copenhagen SV
Denmark
Phone: +45 33 85 11 00
Fax: +45 33 85 10 17
manufacturing-dk@mandieselturbo.com
Forwarding & Receiving
Teglholmsgade 35
2450 Copenhagen SV
Denmark
Phone: +45 33 85 11 00
Fax: +45 33 85 10 16
shipping-cph@mandieselturbo.com
MAN Diesel & Turbo
Branch of MAN Diesel & Turbo SE,
Germany
CVR No.: 31611792
Head ofice: Teglholmsgade 41
2450 Copenhagen SV, Denmark
German Reg.No.: HRB 22056
Amtsgericht Augsburg
Service Letter SL12-554/JAP
Hard coating (cermet)
The hard coating on the 1st ring is introduced to reduce
the wear on the top ring and ensure that the CL (Controlled
Leakage) grooves, in extreme cases, are not prematurely
worn out. Additionally, the cermet coating contributes to
keeping an acceptable liner wear rate, e.g. when the fuel
sulphur amount is not high enough to keep the controlled
corrosion at a desired level.
Alternative Heavy Duty Ring Coniguration:
1st ring
CL-grooves:
CPR E4-180
Base material:
Vermicular cast iron, CV1
Hard coating:
Cermet coating
Running-in coating:
Alu coating
Bottom face:
Crome plating
Chromium plating
Chromium plating has been introduced on the lower faces
of the 1st and 2nd piston rings. The chromium plating en-
ables the rings to endure higher levels of abrasive particles.
A high level of fuel cleaning must always be ensured when
the fuel contains abrasive particles (catalytic ines).
It is impossible to keep the combustion chamber 100%
free of abrasive particles, and some of the particles end
up in the cylinder lube oil ilm, on the cylinder liner piston
crown, and in the piston ring grooves, where the particles
can be trapped on the lower surface of the piston rings. In
severe cases, the ring grooves are worn down prematurely
due to lexing of the piston ring during the engine stroke.
2nd ring – left cut
Base material:
Grey cast iron, CF5
Running-in coating:
Alu coating
Bottom face:
Chrome plating
By hard-chrome plating the lower face, the surface struc-
ture becomes smooth and prevents the abrasive particles
from being trapped, thereby reducing the ring groove wear.
3rd ring – right cut
Base material:
Grey cast iron, CF5
Running-in coating
Alu coating
4th ring – left cut
Base material:
Grey cast iron, CF5
Running-in coating:
Alu coating
Heavy duty piston ring package. Page 2 of 3 pages
Service Letter SL12-554/JAP
Large bore ring coniguration
Today’s piston ring coniguration on K80 Mk. 9, K90-98,
and S90 bore Mk. 8 & 9 engines is different to other marine
engines. Over time, the engine development has neces-
sitated an upgrade of the ring pack to a semi-hard coated
(rings 1 and 4) ring pack, and the application of chromium
on the lower face of rings 1 and 2.
3rd ring – right cut
Base material:
Grey cast iron, CF5
Run-in coating:
Alu coating
We have been using this coniguration since 2006 with
good results, and subsequent tests on other engine sizes
have led to the introduction of the above alternative stan-
dard on 60-65-70-bore engine types.
It would also be beneicial to apply the large bore standard
on older versions of the above engine types, so as to in-
crease the margin against scufing.
4th ring – left cut
Base material:
Grey cast iron, CF5
Hard coating:
Cermet coating
Large Bore Ring Coniguration:
Run-in coating:
Alu coating
K80 Mk. 9, K90 & K98, S90 Mk. 8-9
1st ring
CL-grooves:
CPR E4-180
Base material:
Vermicular cast iron, CV1
Hard coating:
Cermet coating
Run-in coating:
Alu coating
Bottom face:
Crome plating
To place an order, or for further advice or clariication, you
are welcome to contact MAN Diesel & Turbo PrimeServ in
Copenhagen (email: Primeserv-cph@mandiesel.com).
Questions regarding this service letter can be directed at
our Operation department in Copenhagen (email: Opera-
tion-cph@mandieselturbo.com).
2nd ring – left cut
Base material:
Grey cast iron, CF5
Run-in coating:
Alu coating
Bottom face:
Chrome plating
Heavy duty piston ring package. Page 3 of 3 pages
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