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Thread: M50 Eng 4L30E Trans RRR - Far More Than I Ever Expected

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  1. #9
    Join Date
    May 2004
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    San Joaquin Valley CA
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    264

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    Quote Originally Posted by whiskychaser View Post
    Its a brave man that takes on an engine and a transmission rebuild at one time:-) I am really impressed with your preparation and how clean everything looks. Great stuff
    Thanks! Brave or dumb, hard to tell the difference sometimes. Plain scary to think of all the little things that could crop up on restart. I started out thinking this was a HG job and I just got sucked further and further into the abyss. At one point I was going to yank the engine and was advised that pulling the engine AND tranny is smarter. Then, the "hey, the tranny is right there, it has 178k on it..." Yikes. On the cleanliness I've gotten more deliberate as I've gotten older. The "Clean room wipes" I learned about on Pelican Parts are a God send. My stainless steel workbench is easy to keep clean and that Simple Green Max works really well. Ziploc bags are really handy too.

    Quote Originally Posted by genphreak View Post
    Hahhah... more 'M p0rn'! Do shoot more close-ups of all the booty on that sweet piece of black metal... as yo get the time and inclination.
    The pump is a nice piece of work. Are you swapping the drive sprocket? I can't see how bad it is but on the M30s I know the sprocket teeth wear sharp too but you have to put in a new chain and both sprockets else they will chew each other to bits in time. They don't cost much and make for good piece of mind.
    Yeah, I wish I shot more photos of the tranny build, you never regret having too many photos. The pump photo doesn't show it but the oil pump drive sprocket looked new. Having worked in a bike shop for 7 years and raced karts for 8 years, I know sprocket wear patterns and that sprocket is pristine. Yes, at $33 the pump sprocket isn't much but the low mechanical resistance and precision chain manufacturing have left that sprocket perfect. What kills a sprocket is chain stretch. When the chain stretches it is too long to mesh perfectly with the gear and at it meshes it wears the shoulders off of the gear. I will shoot a pic, but I'm tellin' you, it's remarkable in its condition. Although I lead the league in second-guessing, that one is a slam dunk.

    Thanks for your comments.
    Last edited by 93 525 Paul; 02-28-2012 at 02:53 PM.
    Link to my M50 engine rebuild thread
    http://www.bimmernut.com/forum/showthread.php/43339-M50-Eng-4L30E-Trans-RRR-Far-More-Than-I-Ever-Expected?highlight=93+525+paul


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