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Dubbele en Enkele Ketting : Techniek

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Dubbele en Enkele Ketting

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Dubbele en Enkele Ketting

Berichtdoor MB260E » do jun 03, 2010 10:14 am

Goedemorgen , een vraagje over;
Enkele distributieketting W124??

Wie weet er eigenlijk hoe je een enkele distributieketting van een W124 makkelijk kunt controleren op juistheid?

Mocht zich er slijtage voordoen , waaraan kun je dit herkennen/horen zien en op welke manier.

Ik lees net een heel stuk over enkele en dubbele kettingen van een W124 en ze zijn op een bepaald moment overgestapt naar dubbele onderhoudsvrije kettingen waar je nooit meer naar om hoeft te kijken , vandaar de vraag.
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Re:Dubbele en Enkele Ketting

Berichtdoor JantjeV8 » do jun 03, 2010 11:53 am

Controle van een enkele of dubbele ketting werkt op dezelfde manier.

De m102 benzine motoren hebben nog voortkomend uit de W123 serie enkele kettingen. Mogelijk dat ze later daar ook duplex kettingen in toegepast hebben. De om601/602 en 603 diesels hadden van begins af aan duplex kettingen.

Controle:
Kleppendeksel wegnemen.
De motor op de krukas tornen en exact op BDP zetten. Zie merktekens op de poulie.
Daarna kijk je naar de merktekens op de nokkenas, meestel te vinden nabij het eerste lagerblok en kettingwiel. Als het goed is staan die merktekens dan ook exact op de plek. Dan is er geen sprake van rek/slijtage. Staan ze niet gelijk, dan moet je de krukas langzaam verder draaien tot de nokkenas merktekens wel gelijk staan. Daarna lees je de afwijking op de krukas af. Blijkt de afwijking groter dan 6gr (bij de diesels in elk geval) dan is je ketting op gerekt en aan vervanging toe.
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Re:Dubbele en Enkele Ketting

Berichtdoor JantjeV8 » do jun 03, 2010 12:19 pm

Overigens komt kettingbreuk wel eens voor bij enkele kettingen. Dat wordt dan ook direct aan het fenomeen "enkele" toegeschreven, maar ik zie dat toch anders.

De ketting wordt gespannen door een hydraulische spanner, middels de motorolie. Bij de m102 motoren, in tegenstelling tot de diesels met hun vrachtwagenafmetingen, is het oliefilter van de m102 erg onder bemeten. Het komt vaak voor, ook nog afhankelijk van het merk oliefilter, dat het filter al erg veel weerstand biedt aan de olie nog voor z'n volgende servicebeurt nodig is.
Je ziet dat aan het terugvallen van de oliedruk bij warme stationair draaiende motor. Bij gas geven schiet de meter vaak langzaam omhoog terwijl dat fel moet gebeuren. Het vervuilde filter remt dus de oliestroom af. Bij plotselinge lastwissels, of starten bij koude motor en meer van dat soort bewegingen komt dan de olie vertraagd bij de spanner. De ketting gaat vervolgens klapperen met alle gevolgen van dien.
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Re:Dubbele en Enkele Ketting

Berichtdoor MB260E » do jun 03, 2010 12:53 pm

A ha ,
Nu weten we in ieder geval meer.
jantjeV8, wederom bedankt voor je commentaar en inzicht.
( ik heb trouwens eigenlijk nog nooit spannende verhalen gehoord bij W124's waarbij enekele kettingen geknapt zouden zijn)
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Re:Dubbele en Enkele Ketting

Berichtdoor W124500E » vr jun 04, 2010 8:16 am

W124 500E (E60 motor), Eisenmann, gone in less than six seconds.
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