Service Letter SL2016-634/JNN Action code: WHEN CONVENIENT Ridge Wear at Crankpin Journals SL2016-634/JNN November 2016 Dear Sirs Concerns This service letter contains important information about the develop- Owners and operators of ment of ridge wear at the crankshaft journal and the precautions re- MAN four-stroke diesel engines. quired in connection with the replacement of connecting rod bearings. Type: If the ridge is not addressed, this may cause severe engine damage GenSets: L16/24(S), L21/31(S), with a possible loss of property and life. L27/38(S), L23/30H/DF, L23/30S, Ridge wear will inevitably develop over time at the crank pin journal. L28/32H/DF, L28/32S, V28/32H, The wear pattern is caused by abrasive impurities that remain in the V28/32S lube oil. Efficient lube oil cleaning is therefore essential to keep the Propulsion: L21/31, L27/38, L23/30(A), development of ridge wear as low as possible in trunk engines. V23/30(A), L28/32(A), V28/32(A) If you have any questions or comments, please forward your email to
[email protected] with reference to this service letter. Yours faithfully Mikael C. Jensen Jørgen Paaske Nielsen Vice President Superintendent Engineer Engineering Operation MAN Diesel & Turbo MAN Diesel & Turbo MAN Diesel & Turbo H. Christoffersensvej 6 Niels Juels Vej 15 Branch of MAN Diesel & Turbo SE, 4960 Holeby 9900 Frederikshavn Germany Denmark Denmark CVR No.: 31611792 Phone: +45 54 69 31 00 Phone: +45 96 20 41 00 Head office: Teglholmsgade 41 Fax: +45 54 69 30 30 Fax: +45 96 20 40 30 2450 Copenhagen SV, Denmark
[email protected] [email protected] German Reg.No.: HRB 22056 Amtsgericht Augsburg www.mandieselturbo.com Service Letter SL2016-634/JNN Ridge wear will inevitably develop over time at the crank pin journal.