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  1. #1
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    ugh.... Natural weaknesses of the M54b30

    This is a problem that isn't rare on the m54b30, but originated with its crank in the s52.



    uuuuuuuuuuuuuggggggggghhhhhhhhhh

    So the Vaio solution will be the replacement.

    Click here to enlargeClick here to enlarge
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    can you elaborate a little? It looks like a nut welded onto a sprocket. Be careful about that, the heat affected zone does cause high residual stresses and a mode for failure.
    Some people live long, meaningful lives.

    Other people eat shit and die.

    I'm not racist, I hate everybody equally; especially fat people.


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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
    can you elaborate a little? It looks like a nut welded onto a sprocket. Be careful about that, the heat affected zone does cause high residual stresses and a mode for failure.
    I don't think heat has anything to do with it.....look at the sprocket, they printed the loosen directions backwards. The sprocket was installed inverted....that's why it broke off.

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    Its his flux capacitor drive shaft.

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    good ol oil pump cog...

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    I figured I'd pick up at least 100whp by removing this, so a quick whack of the hammer removed it. I'm shooting for at least 500whp on 12psi for the next dyno.
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    They also spelled loosen and losen, dunno if that one was german.
    Some people live long, meaningful lives.

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    i thought it would be losgaan in german, maybe that's dutch though
    i'm really quiet bad at languages, know too many in parts, none in entirety
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    More accurately the oil pump cog nut issue is relevant to all M5X motors. M50, M50TU, M52, M52TU, M54 and the USA S50 and S52 motors based on it.

    It did not start with the S52. The crank has nothing to do with it.

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    Click here to enlarge Originally Posted by Leo Click here to enlarge
    More accurately the oil pump cog nut issue is relevant to all M5X motors. M50, M50TU, M52, M52TU, M54 and the USA S50 and S52 motors based on it.

    It did not start with the S52. The crank has nothing to do with it.
    lol the crank has everything to do with it! It is the harmonics that loosen or sheer these off, in fact it is from extended rpms above 6000 that really makes the crank like spaghetti.

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    Click here to enlarge Originally Posted by jacobs323i[/URL
    ]lol the crank has everything to do with it! It is the harmonics that loosen or sheer these off, in fact it is from extended rpms above 6000 that really makes the crank like spaghetti.
    for real
    Click here to enlarge Originally Posted by Leo[/URL
    ]More accurately the oil pump cog nut issue is relevant to all M5X motors. M50, M50TU, M52, M52TU, M54 and the USA S50 and S52 motors based on it.

    It did not start with the S52. The crank has nothing to do with it.
    the oil pump nut issue is present across all of these engines, it back off lightly in extreme circumstances on engines that aren't the m54b30 and s52. However, in the S52, frequently the nut backs off after much abuse, when welded it also often shears after a very long time. In the M54b30, good luck finishing a single track event.

    Whereas, many 74mm/84mm cars dont endure many track events and much abuse without ever approaching the oil pump nut.

    These have been my observations. Have you observed differently?
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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
    can you elaborate a little? It looks like a nut welded onto a sprocket. Be careful about that, the heat affected zone does cause high residual stresses and a mode for failure.
    Same question, sorry, don't know if I'm missing it? Weakness is a crank issue?

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    1 out of 1 members liked this post. Yes Reputation No
    the poor harmonics of the crank are amplified in the aluminum block. The s52 has this same issue, but the iron block makes it much easier to deal with. Most of the 89.6mm turbo guys manage to get away with what I thought I was getting away with: a welded oil pump nut. Though that's despite my earlier experiences and PEI's recommendations. This is not the first time this happens to me.

    There's a solution employed by many of the m54 guys that I did not seek. I am going to it now. For more on this subject, read PEI's thread on this matter: http://forum.e46fanatics.com/showthread.php?t=833891

    btw, i used to run the VAC pump shaft and sprocket, but that setup got eaten by other issues while in my previous engine or the one before that.
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