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ENGINE REBORES

ENGINE REBORES Radioactive Ring Tests. One of th e illustrations reproduced gives the results ENGIN E of some radioactive ring tests made with a popular American passenger car. The car was operated on a variety of oils and instantaneous wear measurements REBORE S were made during starting and operation throughout each cycle which covered a predetermined course in city traffic and highway. The data presented was obtained with an oil "Fo r Service ML " and with When and Why? another grade which laboratory tests indicated to be satisfactory, "For Service MS" . (For meanings of A SURVEY of owners' reasons for having their car designations MS, MM, etc., see Scientific Lubrication, engines overhauled was recently made in the U.S.A., June, 1952, p . 11). Wear in traffic was about twice and a large number of engines ranging from 1934 to tha t in highway operation and starting accounted for 1939 models was inspected immediately upon dis­ about one third of the total wear. The authors con­ assembly and before damaged parts or deposits were cluded that improvement in wear reduction can be removed. The results of this work were given achieved by designing oils for specific service, and recently in a paper "Tailoring Lubricating Oils t o Fit to prove their point, gave field examples of engines Service Requirements" by J. A. Miller (California run on oils, "Fo r Service MM" and "For Service Research Corporation) and B. M. Berry (Standard Oil MS " respectively, the latter giving much better Co. of California) at a Society of Automobile Engineers meeting. It was shown that 63 per cent of engines results and reducing deposits and wear under low inspected were being overhauled because oil con­ operating temperatures stop-start service. sumption was excessive and 29 per cent because of mechanical failures. Of the 63 per cent, over half were being repaired because of high oil consumption only and the remainder because of this plus some other cause of engine malfunctioning. Oil ring clogging was observed in excess of 50 per cent of engines, as also was cylinder taper in excess of 0.010 in. Ring Clogging and Bore Taper. Inspection of 63 engines revealed tha t in 80 per cent of cases, high oil consumption was caused by oil ring clogging and cylinder wear. In the remaining cases, mechanical failures such as cracked pistons, failed bearings or oil seals, etc., were contributory factors. Cylinder taper of about 0.17 in. resulted in high oil consumption regardless of amount of ring clogging. Shop experience agrees that oil control cannot be maintained by re-ringing when tapers exceed 0.012 to 0.015 in. I t was found that engines used predominantly for high-speed, cross-country driving, as opposed to low temperature, stop-start service, were relatively free from deposits and cylinder wear was low. Drivers' opinions on oil consumption showed that oil mileages in excess of 650 miles per quart were satisfactory, below 400 were considered high and less than 200 unsatisfactory. Mileages of less than 250 per quart justified overhaul. Scientific LUBRICATION September, 1952 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Industrial Lubrication and Tribology Emerald Publishing

ENGINE REBORES

Industrial Lubrication and Tribology , Volume 4 (9): 1 – Sep 1, 1952

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0036-8792
DOI
10.1108/eb052193
Publisher site
See Article on Publisher Site

Abstract

Radioactive Ring Tests. One of th e illustrations reproduced gives the results ENGIN E of some radioactive ring tests made with a popular American passenger car. The car was operated on a variety of oils and instantaneous wear measurements REBORE S were made during starting and operation throughout each cycle which covered a predetermined course in city traffic and highway. The data presented was obtained with an oil "Fo r Service ML " and with When and Why? another grade which laboratory tests indicated to be satisfactory, "For Service MS" . (For meanings of A SURVEY of owners' reasons for having their car designations MS, MM, etc., see Scientific Lubrication, engines overhauled was recently made in the U.S.A., June, 1952, p . 11). Wear in traffic was about twice and a large number of engines ranging from 1934 to tha t in highway operation and starting accounted for 1939 models was inspected immediately upon dis­ about one third of the total wear. The authors con­ assembly and before damaged parts or deposits were cluded that improvement in wear reduction can be removed. The results of this work were given achieved by designing oils for specific service, and recently in a paper "Tailoring Lubricating Oils t o Fit to prove their point, gave field examples of engines Service Requirements" by J. A. Miller (California run on oils, "Fo r Service MM" and "For Service Research Corporation) and B. M. Berry (Standard Oil MS " respectively, the latter giving much better Co. of California) at a Society of Automobile Engineers meeting. It was shown that 63 per cent of engines results and reducing deposits and wear under low inspected were being overhauled because oil con­ operating temperatures stop-start service. sumption was excessive and 29 per cent because of mechanical failures. Of the 63 per cent, over half were being repaired because of high oil consumption only and the remainder because of this plus some other cause of engine malfunctioning. Oil ring clogging was observed in excess of 50 per cent of engines, as also was cylinder taper in excess of 0.010 in. Ring Clogging and Bore Taper. Inspection of 63 engines revealed tha t in 80 per cent of cases, high oil consumption was caused by oil ring clogging and cylinder wear. In the remaining cases, mechanical failures such as cracked pistons, failed bearings or oil seals, etc., were contributory factors. Cylinder taper of about 0.17 in. resulted in high oil consumption regardless of amount of ring clogging. Shop experience agrees that oil control cannot be maintained by re-ringing when tapers exceed 0.012 to 0.015 in. I t was found that engines used predominantly for high-speed, cross-country driving, as opposed to low temperature, stop-start service, were relatively free from deposits and cylinder wear was low. Drivers' opinions on oil consumption showed that oil mileages in excess of 650 miles per quart were satisfactory, below 400 were considered high and less than 200 unsatisfactory. Mileages of less than 250 per quart justified overhaul. Scientific LUBRICATION September, 1952

Journal

Industrial Lubrication and TribologyEmerald Publishing

Published: Sep 1, 1952

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