Bosch M30 starters reassembling tutorial (both types)

Discussion in 'E9 Projects and Restorations' started by Wladek, Sep 13, 2018.

  1. Wladek

    Wladek Active Member

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    Hello there,
    yesterday was reassembling M30 Bosch starters for my CSI engines, made some photo's - maybe someone will need them.
    One is 1,5kw older type (cast iron) & one 1,5kw newer partially aluminium type.
    Unfortunately i didn't made photo's during the renovation (let just say both starters where in pretty good shape & needed some cleaning, slight polishing & re-greasing). Cases, bolts where blasted, zinc plated & powder coated.
    20180912_182049.jpg
    Blackened metal washer
    20180912_182308.jpg
    After fitting with front case i noticed that was some little friction between rotor winding & inner part of case when rotating, so i added one additional copper washer
    20180912_182838.jpg
    Arm for solenoid - slide it on plate first, then mount a bolt. Arm should be well greased on both sides.
    20180912_183002.jpg
    Grounding plate mount. Notice that area where this plate is mounted should be free of paint for better ground electrical connection: starter motor <-> solenoid.
    20180912_185356.jpg
    Rubber seal
    20180912_185416.jpg
    Solenoid should be hooked on arm first and then bolted to the frame
    20180912_190117.jpg
    20180912_190125.jpg
    Bolt stator to front frame with two bolts & two locking type washers
    20180912_185041.jpg
    Now connect/mount brushes plate on stator. I used little flat screwdriver to tension the spring then brushes just slides in.
    20180913_084622.jpg
    Now put stator on frame
    20180912_190858.jpg
    For mounting them on you need to make some pressure on plate from the top with one hand & with other hand move brushes with flat screwdriver one by one until they drop completely.
    20180912_190932.jpg
    + wire connection to solenoid
    20180912_191036.jpg
    Rear cap mounting. Notice that all holes should be aligned.
    20180912_191941.jpg
    Now you can screw in long bolts & then mount seal, washers & little cap. Rubber o-ring -> steel thin oring -> copper washer (horseshoe type) -> little cap.
    20180912_192702.jpg
    20180912_192831.jpg
    That's all.
    After reassembly try to rotate the rotor with fingers/hand. If all was assembled & greased well it should rotate just with little resistance.
     
    Last edited: Sep 14, 2018 at 8:54 AM
    Bmachine and Mike Goble like this.
  2. Wladek

    Wladek Active Member

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    Newer type starter reassembling is almost the same, just slight differences:
    20180913_083158.jpg 20180913_084512.jpg 20180913_085147.jpg 20180913_090154.jpg 20180913_090719.jpg 20180913_092318.jpg
     
  3. Bmachine

    Bmachine Well-Known Member Site Donor $$

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    Awesome write up and photos! Thank you.
     
  4. Markos

    Markos Parts Hoarder Staff Member Site Donor $$

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    Nice job!

    With that said, I’m never taking mine apart. ;)
     
  5. Honolulu

    Honolulu Well-Known Member

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    Great pictures and I hope, knowing how difficult it is to remove the starter with engine in place, that I never have to come back to them. I've been at my starter once, the lever between the solenoid and starter gear was binding. Some WD-40 and massage loosened it up. I need to drive more...
     
  6. Wladek

    Wladek Active Member

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    I was thinking of buying new ones - but changed my mind after looked inside.
    Yeah that mounting bolt near engine wall is pain. I think anyone who want to do anything with M30 starter should start with buying special bent wrench.
     
    Markos likes this.
  7. bluecoupe30!

    bluecoupe30! Active Member Site Donor $

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    This is the wrench that allowed me to remove my starter with carbs still attached, no less! Was called an "obstruction" wrench.
    SAM_3040.JPG
     
  8. Ohmess

    Ohmess I wanna DRIVE! Site Donor $

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    Excellent write ups. I bought an extra set of metric combination wrenches to have in the car when I travel, and the Craftsman set I bought was totally flat. Because the 17mm was flat, I was able to remove the top mounting bolt by coming straight down at it parallel to the firewall.
     
  9. Stan

    Stan Well-Known Member Site Donor

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    wow, a DeQuincy-level restoration!
     
  10. StephenZ

    StephenZ Active Member Site Donor

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    Very cool! I love fun projects like these. Unlike replacing my wife's starter in her 330i..but she was happy, and that's more important...lol
     

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