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Thread: Starter motor makes strange noise, then smoke

  1. #1
    Join Date
    Jan 2006
    Location
    Netherlands
    Posts
    17

    Default Starter motor makes strange noise, then smoke

    Hi,

    Yesterday, my starter motor would run, but it wouldn't rotate the engine.
    I thought perhaps the voltage was too low because of the cold weather, so I recharged the battery.

    I retried today and again it made the high-whining-noise but it didn't rotate the engine and then there was a small "explosion" and a lot of whitish smoke came out of the hood.

    I ran to get the extuingisher, but that wasn't neccessary luckily.

    Any idea what might have happened?

    I think I'll just have to replace the starter motor?
    Luckily the M40 starter motors are identical, so I can easily find one on the stockyards.

    thanks in advance,
    Ed,
    the Netherlands

  2. #2
    Join Date
    Dec 2005
    Location
    Brisbane Australia
    Posts
    1,447

    Default

    A similar think happened to me once in a Hyundai Sonata, It went to start and nothing happened but a puff of white smoke seemed to come out of the hood. then the Motor was stuffed.

    Turned out oil had leaked into the starter, shorted it and fried it.

    Germans: Why can't they make everything?

  3. #3
    Join Date
    Jan 2006
    Location
    Netherlands
    Posts
    17

    Default How to swap the startmotor

    Rob, thanks for your reply. I guess that's what happened.
    Today I got a startmotor from an E30 BMW 316i (M40).

    Any tips on how I could best remove the startmotor from the engine. I know it's only two bolts. It's hidden behind the intake manifold of the M50B25.

    Thanks!

  4. #4
    Join Date
    Jun 2005
    Location
    Cleveland, OH
    Posts
    1,279

    Default

    Quote Originally Posted by EdNL
    Rob, thanks for your reply. I guess that's what happened.
    Today I got a startmotor from an E30 BMW 316i (M40).

    Any tips on how I could best remove the startmotor from the engine. I know it's only two bolts. It's hidden behind the intake manifold of the M50B25.

    Thanks!
    The Bently way to do it is to pull the intake.....
    If it cannot be fixed by the dremel or ducktape.. get out the sledge...
    --------------------------------------------------------------------
    I miss my e34

  5. #5
    Join Date
    Jan 2006
    Location
    Netherlands
    Posts
    17

    Default

    Quote Originally Posted by dacoyote
    The Bently way to do it is to pull the intake.....
    I was afraid Bentley was gonna say that. I will try tomorrow with the intake manifold still in place. I'll report here it it worked.

    Ed

  6. #6
    Join Date
    Mar 2004
    Location
    Phoenix, AZ
    Posts
    285

    Default I just did mine last weekend.......

    I have the same car/motor, but in a 93 model.

    I searched for help here but no one knew any good tips.

    I hope you haven't done it yet because I have a few for ya.

    The Bentley basically has a short procedure for R&R of the starter, as you know. The bitch of it is that you have to go to the head removal procedure first The Bentley should rewrite the procedure so that it is more clear.

    I wasn't about to drain the radiator to change a starter. So, here is what I did:

    First, disconnect battery negative terminal.

    Removed the two plastic engine covers and coil pack wires (laid cabling on windshield). There is a ground wire on the front top of the engine that has to be disconnected.

    Removed the duct between the MAF and the throttle body. The manual says to remove the two hoses the from the air filter intake box to the throttle body. I did not do this (and accidently broke one of the plastic thermostat leads - $59 from the stealer, FYI). What I should have done was just remove the bolt that holds the thermostat in the filter box, pull the thermostat out of the box, and that would have kept the entire cooling system sealed and undisturbed. Now I know.

    Removed the intake temp sensor connector wires from the intake manifold.

    Remove the fuel rail by first removing the two bolts and then loosening the 6 retaining clips between the rail and the injectors.

    Remove all (7?) bolts from the top of the intake manifold.

    Remove the vacuum return line from the front top of the engine.

    Carefully lift the intake manifold up and off the head. I used some rags to protect the manifold from the rest of the components and a wire hanger to hold it up above so I could see the starter. There are some hoses and brackets that need to be relocated or diconnected, but nothing tough. Careful not to break any cooked, brittle vac hoses. This is a good time to check for them since you can hardly see them at any other time.

    Also, DO NOT drop anything into the six intake ports! Intake valves are clearly visible at this point.

    Remove the wiring from the starter. Remove the two mounting nut/bolts (180 degrees apart). The bolts are male torx (size ?) and come in from the rear - like over the tranny. I just slid them back about a half inch and did not remove them completely.

    Slide the starter directly forward and it comes out. There is one short peg on the top of the flywheel casing that ensures proper alignment. I prevents you from just lifting straight up.

    Clean up a bit and reinstall new starter in reverse proceedure. One part of the Bentley that is so very correct is to grease the **** out of the gear spline on the starter before putting it in. I think that my old starter had slowly lost lubrication over the years and thats the biggest reason the gear wouldn't retract quickly after I let go of the key. Nice grinding sound!

    FYI - Rebuilding these Bosch starters is not all that hard. I got one off Ebay for $20 and stripped & repainted the casing, dismanteled the body and solenoid assembly, cleaned and lube the internal gears with a high temp gear lube (graphite based) and reassembled in under an hour. They're not that tough!

    Good luck and let me know if this helps or if you need any other assistance.

    JD

  7. #7
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
    14,709

    Default

    nice work JD!
    95 E34 530I V2.34
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  8. #8
    Join Date
    Jun 2005
    Location
    Cleveland, OH
    Posts
    1,279

    Default

    Nice... I will move this to engine / drive train later...
    If it cannot be fixed by the dremel or ducktape.. get out the sledge...
    --------------------------------------------------------------------
    I miss my e34

  9. #9
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
    14,709

    Default

    your a moderator???
    Quote Originally Posted by dacoyote
    Nice... I will move this to engine / drive train later...
    95 E34 530I V2.34
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  10. #10
    Join Date
    Jun 2005
    Location
    Cleveland, OH
    Posts
    1,279

    Default

    Quote Originally Posted by 632 Regal
    your a moderator???
    for engine and drive train... yeah
    If it cannot be fixed by the dremel or ducktape.. get out the sledge...
    --------------------------------------------------------------------
    I miss my e34

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