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Marelli Starter Drives

Discussion in 'Technical Q&A' started by racerboy9, Oct 10, 2021.

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  1. racerboy9

    racerboy9 F1 Rookie
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    Nov 3, 2003
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    #1 racerboy9, Oct 10, 2021
    I am disassembling a few Marelli starter drives and am not sure if they should be assembled dry or with grease. They may have been originally assembled with a very light coating of grease that has dried up over the 50+ years. The few YouTube videos of starter drive repairs show grease being used.
     
  2. raemin

    raemin Formula 3

    Jan 16, 2007
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    #2 raemin, Oct 11, 2021
    You don't want the grease to mess with the starter clutch. Maybe one-way bearing grease would be appropriate?
     
  3. racerboy9

    racerboy9 F1 Rookie
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    #3 racerboy9, Oct 11, 2021
    After doing a little web searching on sprag clutches it seems like a light coating of silicone grease may work.
     
  4. raemin

    raemin Formula 3

    Jan 16, 2007
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    R. Emin
    #4 raemin, Oct 11, 2021
    Back in the day when I was flying RC heli, we had tons of problems with sprags that would disengage mid-flight (sadly I was real bad at autorotation...). The idea is to use a lubricant that does not stick and that does not incorporate friction modifiers. In our case ATF was perfect, but maybe not practical in a starter. Pure silicone would probably make it do, not because it is silicone, but because it does not contain any of the nasty additives!

    Renolds does provide some good recommendation on what lubricant to use for sprags.
    https://www.renold.com/media/2068912/complete-sprag-trapped-roller-catalogue.pdf (see page 51)
     
  5. wmuno

    wmuno Formula Junior
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    Bill Muno
    #5 wmuno, Oct 11, 2021
    The V-12 starter doesn't require any lubrication. You can lightly oil the linkage on the V-12 starter solenoid.
    The V-6 starter uses a Bendix drive. See https://en.wikipedia.org/wiki/Bendix_drive Since the pinion gear moves back and forth on the motor shaft, the shaft should have a light coat of grease.
     

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