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Ring groove fill normal. Liner shows little wear. Honing Number 3 and 4 lands clean. marks still visible. Silver trunnion bearing shows normal wear of lead flashing. Valve deck illustrates cleanli- ness typical of both engines. ie MV "Mana"does-for Dillingham. Her 12 645 E6 engines, overhauled at 16,753 hours, looked good for many more-on Caprinus Oil. were reusable without machining for oversize rings), liners and piston skirts. Shell's premium MVI base oil keeps ring groove deposits soft, fri- able so deposits are worked out by ring action. Rings compress into the grooves and traverse the ports without breaking or chipping. The result is low ring and liner wear rates. In addition, Dillingham's use of Caprinus R in its Fairbanks Morse engines has eliminated the former expensive task of intake and exhaust port cleaning of those engines three times a year. Caprinus R Oil is Shell's one oil for big medium-speed marine diesels. Its high alkalinity reserve and dispersancy with Shell's premium MVI base oil fight corrosive wear, keep engines clean and deposits soft — so that normal engine operation keeps deposits from building up. It's been proven — in ALCO, EMD and Fairbanks Morse, as well as other engines. For more information write: Shell Oil Company, Manager, Commercial Communications, One Shell Plaza, Houston, TX 77002. Come to 1 'Caprinus is a trademark and is —, 11 * used as such in this writing. Shell tOf anSWefS During late 1976, the then new MV Mana's engines were filled with high alkalinity Caprinus* T Oil. Then, in 1978, the switch was made to the even more improved Caprinus R Oil. Since 1976 the engines have racked up 16,753 hours before scheduled overhaul — without a single power- pack replacement. The consensus? The engines looked good enough for 20,000 hours — proba- bly even longer. Dillingham Tug & Barge Corporation needs reliability — there are no repair stations between the Hawaiian islands and the "mainland" or throughout the South Pacific where they operate. Dillingham Tug & Barge runs a top-notch main- tenance program with Caprinus R to keep the boats working. Both engines were exceptionally clean. Top ring side clearance averaged 0.013" and the top rings were rated at 2 to 2A — which means the grooves were visible on the top ring on about half the pistons. Silver trunnion bearings were good. Overall engine reliability as shown by mainte- nance records was excellent. Low wear rates were especially evident in the top ring side clearances, ring gap clearances, ring faces, piston ring groove widths (pistons
