{"id":2836,"date":"2023-11-17T22:51:07","date_gmt":"2023-11-17T21:51:07","guid":{"rendered":"https:\/\/mbci.mackuz.ovh\/?p=2836"},"modified":"2023-11-17T22:51:07","modified_gmt":"2023-11-17T21:51:07","slug":"checking-and-reconditioning-of-crankshaft","status":"publish","type":"post","link":"https:\/\/mbci.mackuz.ovh\/index.php\/2023\/11\/17\/checking-and-reconditioning-of-crankshaft\/","title":{"rendered":"Checking and reconditioning of crankshaft"},"content":{"rendered":"

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03\u2014318 Checking and reconditioning of crankshaft<\/strong><\/div>\n<\/div>\n<\/td>\n
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Data<\/div>\n<\/div>\n<\/td>\n
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Crankshaft standard dimension and repair stages<\/div>\n<\/div>\n<\/td>\n
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Crankshaft bearing journal dia.<\/div>\n<\/div>\n<\/td>\n
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Fitted bearing Pertinent thickness Width of of thrust washers journal<\/div>\n<\/div>\n<\/td>\n
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Crankpin dia.<\/div>\n<\/div>\n<\/td>\n
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Width of pins<\/div>\n<\/div>\n<\/td>\n
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Standard dimension<\/div>\n<\/div>\n<\/td>\n
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69.96 69.95<\/div>\n<\/div>\n<\/td>\n
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2 15 3400 <\/sup>34.03<\/div>\n<\/div>\n<\/td>\n
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51.96 51.95<\/div>\n<\/div>\n<\/td>\n
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32.00<\/div>\n<\/div>\n<\/td>\n
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2 20 3410 <\/sup>34.13<\/div>\n<\/div>\n<\/td>\n
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32.10<\/div>\n<\/div>\n<\/td>\n
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1st repair stage<\/div>\n<\/div>\n<\/td>\n
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69.71 69.70<\/div>\n<\/div>\n<\/td>\n
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34.20 2 25 34.23<\/div>\n
or or<\/div>\n
2 35 34.40<\/div>\n
34.43<\/div>\n
or or<\/div>\n
2.40 34.50 34.53<\/div>\n<\/div>\n<\/td>\n
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51.71 51.70<\/div>\n<\/div>\n<\/td>\n
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to 32.30<\/div>\n<\/div>\n<\/td>\n
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2nd repair stage<\/div>\n<\/div>\n<\/td>\n
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69.46 69.45<\/div>\n<\/div>\n<\/td>\n
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51.46 51,45<\/div>\n<\/div>\n<\/td>\n
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3rd repair stage<\/div>\n<\/div>\n<\/td>\n
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69.21 69.20<\/div>\n<\/div>\n<\/td>\n
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51,21 51.20<\/div>\n<\/div>\n<\/td>\n
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4th repair stage<\/div>\n<\/div>\n<\/td>\n
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68.96 68.95<\/div>\n<\/div>\n<\/td>\n
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50.96 50.95<\/div>\n<\/div>\n<\/td>\n
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Permissible out-of-round of crankshaft journals and crankpins<\/div>\n<\/div>\n<\/td>\n
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0.005<\/div>\n<\/div>\n<\/td>\n
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Permissible conicity of crankshaft journals and crankpins<\/div>\n<\/div>\n<\/td>\n
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0.01<\/div>\n<\/div>\n<\/td>\n
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Permissible radial runout of flywheel flange<\/div>\n<\/div>\n<\/td>\n
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0.02<\/div>\n<\/div>\n<\/td>\n
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Permissible axial runout of fitted bearing<\/div>\n<\/div>\n<\/td>\n
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0.02<\/div>\n<\/div>\n<\/td>\n
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on crankshaft bearing journals<\/div>\n<\/div>\n<\/td>\n
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2.5 to 3.0<\/div>\n<\/div>\n<\/td>\n
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Fillets<\/div>\n<\/div>\n<\/td>\n
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on crankpins<\/div>\n<\/div>\n<\/td>\n
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3.0 to 3.5<\/div>\n<\/div>\n<\/td>\n
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Permissible radial runout of crankshaft journals when mounted on outer journals<\/div>\n<\/div>\n<\/td>\n
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journal II, V<\/div>\n<\/div>\n<\/td>\n
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0.16<\/div>\n<\/div>\n<\/td>\n
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journal III, IV<\/div>\n<\/div>\n<\/td>\n
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0.25<\/div>\n<\/div>\n<\/td>\n
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Scleroscope hardness of crankshaft journals and crankpins<\/div>\n<\/div>\n<\/td>\n
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55-74<\/div>\n<\/div>\n<\/td>\n
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Permissible unbalance of crankshaft<\/div>\n<\/div>\n<\/td>\n
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15 cmg<\/div>\n<\/div>\n<\/td>\n
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03.8-318\/1<\/div>\n<\/div>\n<\/td>\n
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Note<\/strong><\/div>\n<\/div>\n<\/td>\n
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The bearing journals of crankshaft are not inductance hardened similar to other engines, but are hardened in a nitride bath.<\/div>\n
Contrary to inductance hardened crankshaft, a bath-nitrided crankshaft is hardened at its entire surface.<\/div>\n<\/div>\n<\/td>\n
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Conventional hardness tester (hardness drop tester) provides no information concerning proper hardness (depth of connecting layer) for crankshafts hardened in a nitride bath. No hardness test according to the above method is therefore required.<\/div>\n<\/div>\n<\/td>\n
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When testing and reconditioning crankshafts, proceed in sequence of diagram below.<\/div>\n<\/div>\n<\/td>\n
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Diagram<\/strong><\/div>\n<\/div>\n<\/td>\n
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* Refer to section „Explanations Concerning Diagram” V = scrap.<\/div>\n<\/div>\n<\/td>\n
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03.8-318\/2<\/div>\n<\/div>\n<\/td>\n
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\"om617<\/div>\n<\/td>\n
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03.8-318\/3<\/div>\n<\/div>\n<\/td>\n
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Explanations concerning diagram<\/strong><\/div>\n<\/div>\n<\/td>\n
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Crack test<\/strong><\/div>\n<\/div>\n<\/td>\n
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Clean crankshaft. Bearing journals should be free of oil and grease.<\/div>\n
Magnetize crankshaft and apply fluorescent powder (fluxing).<\/div>\n
A color penetration test (immersion in bath or using spray can) may also be applied.<\/div>\n
Aid: Paint or fluorescent powder Cleaning agent Developer<\/div>\n<\/div>\n<\/td>\n
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Hardening<\/strong><\/div>\n
Crankshaft must be nitride-hardened in a salt bath.<\/div>\n
Attention!<\/strong><\/div>\n
Prior to nitriding, close all threaded bores in crank\u00adshaft.<\/div>\n<\/div>\n<\/td>\n
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Hardened threads will loose in strength and may therefore break out when tightening screws.<\/div>\n
Screw-in necked-down screws on flywheel flange.<\/div>\n
Screw-in a hollow center screw M 18 x 1.5 x 45 at front on crankshaft.<\/div>\n<\/div>\n<\/td>\n
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Center screw is bored hollow to prevent a chemical reaction in salt bath caused by the air which might be enclosed behind screw.<\/div>\n
Duration and bath temperature are shown in nitriding specifications included upon delivery of nitriding equipment.<\/div>\n
To avoid distorsion of crankshaft, suspend crankshaft vertically into nitriding bath.<\/div>\n<\/div>\n<\/td>\n
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03.8-318\/4 F2<\/div>\n<\/div>\n<\/td>\n
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    03\u2014318 Checking and reconditioning of crankshaft   Data   Crankshaft standard dimension and repair stages Crankshaft bearing journal dia. Fitted bearing Pertinent thickness Width of of thrust washers journal Crankpin dia. Width of pins Standard dimension 69.96 69.95 2 15 3400 34.03 51.96 51.95 32.00 2 20 3410 34.13 32.10 1st repair stage 69.71 69.70 34.20 2 25 34.23 or or 2 35 34.40 34.43 or or 2.40 34.50 34.53 51.71 51.70 to 32.30 2nd repair stage 69.46 69.45 51.46 51,45 3rd repair stage 69.21 69.20 51,21 51.20 4th repair stage 68.96 68.95 50.96 50.95   Permissible out-of-round of crankshaft journals and crankpins 0.005   Permissible conicity of crankshaft journals and crankpins 0.01   Permissible radial runout of flywheel flange 0.02   Permissible axial runout of fitted bearing 0.02   on crankshaft bearing journals 2.5 to 3.0   Fillets   on crankpins 3.0 to 3.5   Permissible radial runout of crankshaft journals when mounted on outer journals journal II, V 0.16 journal III, IV 0.25   Scleroscope hardness of crankshaft journals and crankpins 55-74   Permissible unbalance of crankshaft 15 cmg   03.8-318\/1       Note   The bearing journals of crankshaft are not inductance hardened similar to other engines, but are hardened in a nitride bath. Contrary to inductance hardened crankshaft, a bath-nitrided crankshaft is hardened at its entire surface.   Conventional hardness tester (hardness drop tester) provides no information concerning proper hardness (depth of connecting layer) for crankshafts hardened in a nitride bath. No hardness test according to the above method is therefore required.   When testing and reconditioning crankshafts, proceed in sequence of diagram below.   Diagram   * Refer to section „Explanations Concerning Diagram” V = scrap.   03.8-318\/2         03.8-318\/3       Explanations concerning diagram   Crack test   Clean crankshaft. Bearing journals should be free of oil and grease. Magnetize crankshaft and apply fluorescent powder (fluxing). A color penetration test (immersion in bath or using spray can) may also be applied. Aid: Paint or fluorescent powder Cleaning agent Developer   Hardening Crankshaft must be nitride-hardened in a salt bath. Attention! Prior to nitriding, close all threaded bores in crank\u00adshaft.   Hardened threads will loose in strength and may therefore break out when tightening screws. Screw-in necked-down screws on flywheel flange. Screw-in a hollow center screw M 18 x 1.5 x 45 at front on crankshaft.   Center screw is bored hollow to prevent a chemical reaction in salt bath caused by the air which might be enclosed behind screw. Duration and bath temperature are shown in nitriding specifications included upon delivery of nitriding equipment. To avoid distorsion of crankshaft, suspend crankshaft vertically into nitriding bath.   03.8-318\/4 F2          <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","footnotes":""},"categories":[47,44],"tags":[],"class_list":["post-2836","post","type-post","status-publish","format-standard","hentry","category-crankshaft-assembly-om617","category-om617"],"aioseo_notices":[],"featured_image_src":null,"author_info":{"display_name":"mackuz","author_link":"https:\/\/mbci.mackuz.ovh\/index.php\/author\/mackuz\/"},"_links":{"self":[{"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/posts\/2836","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/comments?post=2836"}],"version-history":[{"count":1,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/posts\/2836\/revisions"}],"predecessor-version":[{"id":2837,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/posts\/2836\/revisions\/2837"}],"wp:attachment":[{"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/media?parent=2836"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/categories?post=2836"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mbci.mackuz.ovh\/index.php\/wp-json\/wp\/v2\/tags?post=2836"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}