{"id":5853,"date":"2023-06-09T07:07:20","date_gmt":"2023-06-09T07:07:20","guid":{"rendered":"https:\/\/seadonna.com\/blog\/?p=5853"},"modified":"2023-06-10T12:55:55","modified_gmt":"2023-06-10T12:55:55","slug":"lubricator-and-quills-meo-class-4-class-2-marine-engineer-study-guide-mechanical-engineering","status":"publish","type":"post","link":"https:\/\/seadonna.com\/blog\/lubricator-and-quills-meo-class-4-class-2-marine-engineer-study-guide-mechanical-engineering\/","title":{"rendered":"LUBRICATOR AND QUILLS | MEO CLASS 4 \/ CLASS 2 | MARINE ENGINEER STUDY GUIDE | MECHANICAL ENGINEERING"},"content":{"rendered":"

Lubricator<\/strong><\/p>\n

The lubricators are driven by a common drive from the engine it supply cylinder oil to the cylinder. They are synchronized with the engine to provide timed lubrication.<\/p>\n

How to arrange to supply oil to cylinder (or) when they supply L.O to engine<\/strong>
\nLube oil be fed to the piston at the time when the top two piston rings pass the lubricating holes in the cylinder during the pistons upstroke.
\nTimed lubrication<\/strong>
\n\u2666\u00a0Lubricators of each cylinder are synchronised with engine to provide timed lubrication
\n\u2666\u00a0Cylinder oil is fed; at the time when top two piston rings pass the oil feed points, in the cylinder during piston upstroke [4\/S and 2\/S Uniflow engines]
\n\u2666\u00a0Loop scavenge Sulzer RND engine use accumulator system of timed lubrication
\n\u2666\u00a0Accumulator provides constant oil pressure, which is greater than scavenge air pressure, with uniform supply at every period around TDC and BDC positions.
\n\u2666\u00a0In this way, oil is delivered to quill, only when low pressure and temperature prevails on running surface of cylinder liner.
\n\u2666\u00a08 supply points at top, and 1 point for scavenge and 1 point for exhaust ports at bottom<\/p>\n

Timed lubrication has little merits, because<\/strong>
\n\u2666\u00a0It requires very rapid injection of oil at correct time, with correct amount, and pressure
\n\u2666\u00a0It is discharging through very small bore; with long pipes to various oil feed points
\n\u2666\u00a0Having a non-return valve at the top of lubricator, hence it complicates the timed injection
\n\u2666\u00a0The hot combustion gases tend to carbonise the oil, and block the orifices.<\/p>\n

Lubricator Quill<\/strong>
\nLubricator quills are arranged around the periphery of the cylinder liners and connect cylinder lubricators with oil feed points in the cylinder liners.<\/p>\n

Requirement of lubricator<\/strong>
\n\u2666\u00a0Must be capable of delivering regularly every stroke a quantity of oil against moderate pressure
\n\u2666\u00a0Must have a wide range of adjustment
\n\u2666\u00a0The quantity of discharged oil per strike should be clearly visible
\n\u2666\u00a0Can be operated by hand<\/p>\n

How do you do lubricator quill overhaul ?<\/strong>
\n\u2666\u00a0Remove nut on lubricator quill (L.O connector)
\n\u2666\u00a0Take out lubricator quill fitted directly to the cylinder without passing through the jacket cooling space.
\n\u2666\u00a0Remove lubricator quill (L.O outlet side)
\n\u2666\u00a0Take out spring and non return ball valve.
\n\u2666\u00a0Clean all parts in diesel oil.
\n\u2666\u00a0Check non return valve for occur.
\n\u2666\u00a0Check spring tension.
\n\u2666\u00a0Place the non return valve and spring into the lubricator quill then tighten out.
\n\u2666\u00a0Fit the lubricator quill to the cylinder tighten the nut.
\n\u2666\u00a0After fitting the lubricator quill, It is operated by hand at the same time check the cylinder liner wall for sufficient oil come out.<\/p>\n

REQUIREMENTS OF CYLINDER LUB OIL<\/strong>
\n\u2666\u00a0It must reduce sliding friction between piston rings and cylinder liner to a minimum.
\n\u2666\u00a0It must process adequate viscosity at high working temperature and still be sufficiently fluid to spread rapidly over the entire working surfaces to form a good adsorbed oil film.
\n\u2666\u00a0It must form an effective seal in conjunction with the piston rings, preventing gas blow by, burning away of the oil film and lack of compression.
\n\u2666\u00a0It must burn cleanly, leaving as little and as soft a deposit as possible.
\n\u2666\u00a0It must effectively prevent the build up of deposits in the piston ring zones and exhaust ports.
\n\u2666\u00a0It must effectively neutralize the corrosive effects on the mineral acids formed during combustion of the fuel.<\/p>\n

Effects of excess lubrication:<\/strong>
\n\u2666\u00a0Fouling of ring grooves and resulting ring zone deposits.
\n\u2666\u00a0Consequently, loss of gas sealing effect and blow by follows.
\n\u2666\u00a0Fouling of scavenge space and scavenge fire follows.
\n\u2666\u00a0Also affecting combustion process.
\n\u2666\u00a0Leading to breakage of piston rings
\n\u2666\u00a0Fouling of exhaust system and turbocharger.
\n\u2666\u00a0Increase consumption.<\/p>\n

Effects of reduce lubrication:<\/strong>
\n\u2666\u00a0Promote wear of liner and rings
\n\u2666\u00a0Overheating of local area resulting micro seizure due to lack of boundary lubrication.
\n\u2666\u00a0Consequently major damage to piston and cylinder liner.<\/p>\n

How to check correct amount of lubricator feeding ?<\/strong>
\nChecking by open scavenging drain (little coming out O.K) at sea.
\nIn port: Check the liner is wet or not (thin layer wet O.K)
\nOil has to not collect at the scavenge space.<\/p>\n

\"\"<\/p>\n","protected":false},"excerpt":{"rendered":"

Lubricator The lubricators are driven by a common drive from the engine it supply cylinder oil to the cylinder. They are synchronized with the engine to provide timed lubrication. How to arrange to supply oil to cylinder (or) when they supply L.O to engine Lube oil be fed to the piston at the time when […]<\/p>\n","protected":false},"author":1,"featured_media":5854,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[79],"tags":[],"class_list":["post-5853","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-marine-engineering-competency-exams-study-blogs"],"_links":{"self":[{"href":"https:\/\/seadonna.com\/blog\/wp-json\/wp\/v2\/posts\/5853","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/seadonna.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/seadonna.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/seadonna.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/seadonna.com\/blog\/wp-json\/wp\/v2\/comments?post=5853"}],"version-history":[{"count":1,"href":"https:\/\/seadonna.com\/blog\/wp-json\/wp\/v2\/posts\/5853\/revisions"}],"predecessor-version":[{"id":5855,"href":"https:\/\/seadonna.com\/blog\/wp-json\/wp\/v2\/posts\/5853\/revisions\/5855"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/seadonna.com\/blog\/wp-json\/wp\/v2\/media\/5854"}],"wp:attachment":[{"href":"https:\/\/seadonna.com\/blog\/wp-json\/wp\/v2\/media?parent=5853"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/seadonna.com\/blog\/wp-json\/wp\/v2\/categories?post=5853"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/seadonna.com\/blog\/wp-json\/wp\/v2\/tags?post=5853"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}