https://t4zone.info/wiki-oldest/index.php?action=history&feed=atom&title=Vilbrequin%2C_contr%C3%B4le_de_l%27ovalisation 2026-04-04T21:28:28Z Historique pour cette page sur le wiki MediaWiki 1.24.1 https://t4zone.info/wiki-oldest/index.php?title=Vilbrequin,_contr%C3%B4le_de_l%27ovalisation&diff=5736&oldid=prev 2018-02-21T16:44:22Z

<p></p> <table class='diff diff-contentalign-left'> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr style='vertical-align: top;'> <td colspan='2' style="background-color: white; color:black; text-align: center;">← Version précédente</td> <td colspan='2' style="background-color: white; color:black; text-align: center;">Version du 21 février 2018 à 16:44</td> </tr><tr><td colspan="2" class="diff-lineno">Ligne 50 :</td> <td colspan="2" class="diff-lineno">Ligne 50 :</td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; 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[[image:icon_mrgreen.gif|left]] &#160;</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>J'utiliserai un outillage moins pro..... 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Dan32380 https://t4zone.info/wiki-oldest/index.php?title=Vilbrequin,_contr%C3%B4le_de_l%27ovalisation&diff=5735&oldid=prev 2018-02-21T16:42:44Z

<p>Page créée avec « <a href="/wiki-oldest/index.php?title=Cat%C3%A9gorie:Entretien_et_d%C3%A9pannage_du_T4" title="Catégorie:Entretien et dépannage du T4">Catégorie:Entretien et dépannage du T4</a> &#039;&#039;Crédits et remerciements à :&#039;&#039; MonsieurB &#039;&#039;Tuto source :&#039;&#039;http://www.t4zone.info/forum/viewtopic.php?f=62&amp;t=85688... »</p> <p><b>Nouvelle page</b></p><div>[[Catégorie:Entretien et dépannage du T4]]<br /> <br /> <br /> <br /> ''Crédits et remerciements à :'' MonsieurB<br /> <br /> <br /> <br /> ''Tuto source :''http://www.t4zone.info/forum/viewtopic.php?f=62&amp;t=85688<br /> <br /> <br /> ----<br /> <br /> <br /> <br /> == '''Bonsoir à toutes, bonsoir à tous'''==<br /> <br /> <br /> <br /> &lt;u&gt;Préambule et remerciements:&lt;/u&gt;<br /> <br /> Mes remerciements à la modération team pour le travail qui va être fourni!<br /> <br /> Mes remerciements à ceux et celles qui ont eu la patience de répondre à mes questions à propos des vilebrequin.....<br /> <br /> <br /> ----<br /> <br /> <br /> === &lt;u&gt;Ce soir, une histoire de vilebrequin.&lt;/u&gt; ===<br /> <br /> <br /> [http://zupimages.net/viewer.php?id=18/08/ovch.jpg [[image:VILB_01.jpg]]]<br /> <br /> <br /> <br /> Lorsque votre vilebrequin à plus de 400 000 km ou a tourné avec une pression d'huile inadapté ou une huile inadapté, il faut contrôler son ovalisation avant remonte (+ paliers neufs)!<br /> <br /> <br /> <br /> Pour info voiçi comment fonctionne un vilebrequin à deux tourillons et un maneton<br /> <br /> [https://www.youtube.com/watch?v=vRF0DtcYkUg Voir la vidéo]<br /> <br /> Les manetons sont relié aux bielles et les tourillons au bloc. En général sur un quatre cylindre il y a 4 bielles et 5 tourillons. Pour un cinq cylindres c'est 5 manetons et 6 tourillons.<br /> <br /> <br /> <br /> ici un bref rappel du fonctionnement d'un moteur à cycle diesel:<br /> <br /> [https://www.youtube.com/watch?v=aqfzJDOQl7M Voir la vidéo]<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> === &lt;u&gt;L'ovalisation:&lt;/u&gt; ===<br /> <br /> <br /> <br /> Normalement un tourillon ou un maneton c'est cylindrique......parfaitement cylindrique. Seulement après quelques années d'usage ça à tendance à se déformer. <br /> <br /> <br /> <br /> Prenons le cas des manetons; ils sont reliés aux bielles qui vont toujours &quot;taper&quot; du même côté du maneton....ainsi à cette endroit le maneton pourrait perdre en épaisseur.<br /> <br /> <br /> <br /> Les tourillons eux ont plutôt tendance à s'amincir aux extrémités.....mais je ne sais pas pourquoi. Cette information me vient d'un stagiaire de l'afpa &quot;technicien maintenance auto&quot;. <br /> <br /> <br /> <br /> Voici une vidéo de nanard289 contrôlant le &quot;faux rond&quot; ou ovalisation. Comme il est bien équipé il utilise un comparateur. Je vous recommande sa chaine, il y a plein de trucs complètement dingues!!!!!<br /> <br /> [https://www.youtube.com/watch?v=00hRQLIuIqA Voir la vidéo]<br /> <br /> J'utiliserai un outillage moins pro..... [[image:icon_mrgreen.gif|left]] <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> === &lt;u&gt;L'outillage:&lt;/u&gt; ===<br /> <br /> <br /> Le pied à coulisse ne peut être utilisé pour cet usage. Même si il est de bonne facture, le pied à coulisse ne dispose pas d'un &quot;frein&quot; dynamométrique permettant une prise de mesure propre.<br /> <br /> [http://zupimages.net/viewer.php?id=18/08/zuym.jpg [[image:VILB_02.jpg]]]<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> Le micromètre est l'outil adapté pour un graisseux! Peu couteux (90€ un coffret de bon micromètre chez micronfrance), facile d'emploi et esthétique, c'est un jouet que j'aime.<br /> <br /> [[image:VILB_03.jpg]]<br /> <br /> https://www.micronfrance.com/coffret-de-micrometres-d-exterieur-haute-qualite.html<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> [http://zupimages.net/viewer.php?id=18/08/3p4b.jpg [[image:VILB_04.jpg]]]<br /> <br /> <br /> <br /> il est souvent livré avec sa cale de calibrage<br /> <br /> <br /> <br /> [http://zupimages.net/viewer.php?id=18/08/rfyt.jpg [[image:VILB_05.jpg]]]<br /> <br /> <br /> <br /> il est équipé d'un &quot;verrou&quot;<br /> <br /> [http://zupimages.net/viewer.php?id=18/08/ruik.jpg [[image:VILB_06.jpg]]]<br /> <br /> <br /> <br /> mais aussi d'un frein dynamométrique.....cette molette permet d'effectuer un serrage à couple constant......TRES pratique<br /> <br /> [http://zupimages.net/viewer.php?id=18/08/rnyo.jpg [[image:VILB_07.jpg]]]<br /> <br /> <br /> <br /> la ligne de foi permet d'effectuer la mesure<br /> <br /> [http://zupimages.net/viewer.php?id=18/08/pxum.jpg [[image:VILB_08.jpg]]]<br /> <br /> <br /> <br /> spécial AFPA style<br /> <br /> [https://www.youtube.com/watch?v=wPhgH-u-4DE Voir la vidéo]<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> === &lt;u&gt;Ou prendre les mesures?&lt;/u&gt; ===<br /> <br /> Pour une raison que j'ignore les mesures doivent être prise aux extrémité du cylindre de tourillon!<br /> <br /> <br /> <br /> Ainsi on prendra le diamètre ici<br /> <br /> [http://zupimages.net/viewer.php?id=18/08/ib5g.jpg [[image:VILB_09.jpg]]]<br /> <br /> <br /> <br /> puis ici<br /> <br /> [http://zupimages.net/viewer.php?id=18/08/bwc7.jpg [[image:VILB_10.jpg]]]<br /> <br /> <br /> <br /> On devra prendre au moins deux mesures par côté de tourillon, une mesure &quot;à l'horizontal&quot; et une mesure &quot;à la verticale&quot; <br /> <br /> <br /> <br /> ici à l'horizontale<br /> <br /> [http://zupimages.net/viewer.php?id=18/08/5rc5.jpg [[image:VILB_11.jpg]]]<br /> <br /> <br /> <br /> là à la verticale<br /> <br /> [http://zupimages.net/viewer.php?id=18/08/cy1n.jpg [[image:VILB_12.jpg]]]<br /> <br /> <br /> <br /> ainsi il y aura un minimum de 4 mesures par tourillon!<br /> <br /> <br /> <br /> <br /> <br /> Pour ceux qui n'ont pas compris.....ou pas bien vu....je refait une démo sur le tourillon côté distribution<br /> <br /> <br /> <br /> a l'horizontale<br /> <br /> [http://zupimages.net/viewer.php?id=18/08/r0sf.jpg [[image:VILB_13.jpg]]]<br /> <br /> <br /> <br /> A la verticale<br /> <br /> [http://zupimages.net/viewer.php?id=18/08/tp0s.jpg [[image:VILB_14.jpg]]]<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> === &lt;u&gt; Les résultats sur ce vilebrequin:&lt;/u&gt; ===<br /> <br /> <br /> <br /> Les mesures sont exprimées en dixième de millimètre pour le premier chiffre. Donc ici 535 correspond à 53.5mm auquel on ajoute par exemple &quot;+19&quot; exprimé en centième de millimètre. Ainsi &quot;535 + 19&quot; correspond à 53.5mm +19 centième de millimètre soit 53.69mm <br /> <br /> <br /> <br /> TOURILLON 1 (distribution)<br /> <br /> <br /> <br /> &lt;u&gt;côté droit&lt;/u&gt;:<br /> <br /> horizontale :535 + 19.5 <br /> <br /> verticale :535 + 19.75 <br /> <br /> <br /> <br /> &lt;u&gt;côté gauche&lt;/u&gt;:<br /> <br /> horizontale :535 + 20<br /> <br /> verticale :535 +20.5<br /> <br /> <br /> <br /> <br /> <br /> TOURILLON 2<br /> <br /> <br /> <br /> &lt;u&gt;côté droit&lt;/u&gt;:<br /> <br /> horizontale :535 + 19<br /> <br /> verticale :535+ 19<br /> <br /> <br /> <br /> &lt;u&gt;côté gauche&lt;/u&gt;:<br /> <br /> horizontale :535 + 19<br /> <br /> verticale :535 +19<br /> <br /> <br /> <br /> <br /> <br /> TOURILLON 3<br /> <br /> <br /> <br /> &lt;u&gt;côté droit&lt;/u&gt;:<br /> <br /> horizontale :535 +20<br /> <br /> verticale :535 + 19.5<br /> <br /> <br /> <br /> &lt;u&gt;côté gauche&lt;/u&gt;:<br /> <br /> horizontale :535 + 19.5<br /> <br /> verticale :535 + 19.5<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> TOURILLON 4<br /> <br /> <br /> <br /> &lt;u&gt;côté droit&lt;/u&gt;:<br /> <br /> horizontale :535 + 19.75<br /> <br /> verticale :535 + 20<br /> <br /> <br /> <br /> &lt;u&gt;côté gauche&lt;/u&gt;:<br /> <br /> horizontale :535 + 20.5<br /> <br /> verticale :535 + 20<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> TOURILLON 5 (volant moteur)<br /> <br /> <br /> <br /> &lt;u&gt;côté droit&lt;/u&gt;:<br /> <br /> horizontale :535 + 19.5<br /> <br /> verticale :535 + 19.25<br /> <br /> <br /> <br /> &lt;u&gt;côté gauche&lt;/u&gt;:<br /> <br /> horizontale :535 + 19.75<br /> <br /> verticale :535 + 20.05<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> === &lt;u&gt;Conclusions:&lt;/u&gt; ===<br /> <br /> Pour l'ovalisation il est admis (par qui??) que l'on peut aller jusqu'à un dixième de millimètre. <br /> <br /> Nul part sur les résultats ce vilebrequin semble dépasser 0.1mm de différence. <br /> <br /> <br /> <br /> [[image:icon_arrow.gif|left]] Il n'est pas ovalisé.</div>

Dan32380