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hoe nieuwe nokkenas herkennen vroege M117 : Techniek

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hoe nieuwe nokkenas herkennen vroege M117

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hoe nieuwe nokkenas herkennen vroege M117

Berichtdoor Weizengelb » 17 maart 2021, 17:01

Hallo,

Ik heb gelezen dat de eerste 380/500 motoren nogal slechte nokkenassen hadden en dat deze in het algemeen al voor het bereiken van 150.000km vervangen zijn.

Nu heb ik een auto op het oog (500) die schijnbaar maar 122.000km heeft gelopen. Het zou dus kunnen (als dit klopt) dat er nog de originele nokkenassen in zitten. Kan je deze, of de verbeterede nokkenassen herkennen onder het kleppendeksel?

Hebben deze vroege motoren (1980-1981) ook al de (verbrossende) kunststof delen op de nokkenassmering zitten? En de kunststof kettinggeleiders?

Verder was ik wel benieuwd naar Het in 1981 uitgevoerde "energiekonzept". De vroege autos zouden een kortere achterasoverbrenging hebben. Zijn deze dan ook veel vlotter bij het optrekken? (ik vond mijn eerdere 1982 500SE wel snel maar niet echt snel....).

Alvast bedankt voor alle ervaringen.

Groeten Math
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Re: hoe nieuwe nokkenas herkennen vroege M117

Berichtdoor Leeflang » 17 maart 2021, 17:50

Optimum aut nihil.
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Re: hoe nieuwe nokkenas herkennen vroege M117

Berichtdoor Weizengelb » 18 maart 2021, 09:50

Hoi Hans, Leeflang,

bedankt! Wanneer het lukt met de auto zal ik proberen te achterhalen wat er aan onderhoud is gedaan in het verleden. Verder zal ik zo snel mogelijk kijken of er plastic delen vervangen moeten worden. Zijn die plastic delen toevallig wel makkelijk te herkennen aan een andere kleur of zo? of gewoon zien of ze erg oud zijn?

Bij mijn vorige 500 was alles netjes vernieuwd incl. enige hydraulische klepstoters (via de club hiero :-)

Ik heb gelukkig nog wel 2 nieuwe hydraulische stoters liggen mocht het nodig zijn.

Groeten Math
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Re: hoe nieuwe nokkenas herkennen vroege M117

Berichtdoor Vlim » 18 maart 2021, 15:31

Grootste probleem zijn de stoters. Als de oliefilm tussen het oppervlak van de stoter niet meer goed wordt gevormd, dan gaat de stoter de nok letterlijk opvreten.

Zoals Hans zei: oude olie, slechte toevoer via de olieleidingen (plastic clipjes) en leeftijd.

Veel W126's zijn inmiddels ook zo vaak teruggedraaid qua tellerstand dat het ook lastig is om te weten wat ze echt hebben gelopen. Dat maakt het lastig om te bepalen wat de motor echt achter de kiezen heeft.

Ik heb zelf in 24 jaar tijd nog nooit een nokkenas hoeven te vervangen. Regelmatig onderhoud doet wonderen.

De vroege 500's zijn inderdaad wat pittiger. Dat leverde bij het optrekken nogal eens problemen op en ook het verbruik was hoger. Zit hem ook voor een groot gedeelte in de schakelverhoudingen van de automaat, trouwens.
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Re: hoe nieuwe nokkenas herkennen vroege M117

Berichtdoor Weizengelb » 21 maart 2021, 12:34

Hoi Vlim, bedankt voor jouw antwoord.

Dat leverde bij het optrekken nogal eens problemen op

hmm, hoe moet ik dat zien? Bekeuringen? enorme rookwolken en slipsporen? :grin:

We gaan het hopelijk meemaken.
Groeten Math
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Re: hoe nieuwe nokkenas herkennen vroege M117

Berichtdoor Vlim » 21 maart 2021, 19:19

Alledrie :lol:

En bij nat en glad weer sprongen ze opzij. Was ook niet handig.
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