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B18 flywheel questions 120-130

posted by  fervus on  Fri Apr 7 11:40 CST 2023
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last visit: Sun Sep 23 01:37 CST 2012
[RELATED]

Howdy Brickers.

I have my engine apart to change the clutch, and the machine shop I took the flywheel to says the only specs they have for machining the flywheel specify a flat surface. Which is strange because the flywheel I pulled out has a step. Mine also does not have the dowels that the manual talks about.

Any idea what's doing on?

The engine is out of a '66 122s.

Thank you kindly.
--
Charlie








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    B18 flywheel questions 120-130

    posted by  planetman on  Fri Apr 7 20:12 CST 2023
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    last visit: Fri Oct 24 09:29 CST 2014
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    Hello,

    The Volvo repair manuals doesn't mention it, but just about every 6 bolt flywheel I've ever serviced had a step and I've been doing this for over 40 years.

    The early B18 flywheels didn't come with pins.

    Also, early B18 flywheels need to have a recess cut into the inner edge of the flywheel surface to accommodate the updated F&S clutch disc. .

    You can see the recess in the picture below.

    http://hiperformanceautoservice.com/images/6BoltFlywheelStock.jpg

    --
    Eric
    Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
    Torrance, CA 90502
    hiperformanceautoservice.com or oldvolvosonly.com








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      B18 flywheel questions 120-130

      posted by  derek uk on  Mon Apr 10 05:57 CST 2023
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      last visit: Fri Oct 24 12:33 CST 2014
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      The ones with the pins have the recess around the centre. This increases the diameter of the "hole". This is a bit undercut. The ones with no pins are flat with no recess. I think the change came when they changed from spring clutch to diaphragm to get a bit of clearance for the changed driven plate. I have a pic showing both if anyone wants it but like many don't get on with posting pics here. Post an email address if you want a copy. You can disguise the address if needed.








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      B18 flywheel questions 120-130

      posted by  fervus on  Fri Apr 7 21:13 CST 2023
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      last visit: Sun Sep 23 01:37 CST 2012
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      I spoke with someone else earlier who told me that it should be flat 😂

      So I dug around in my spare parts and found a Flywheel that came out of a 63 engine that was flat and had a recess in the center already, and took that one to the machine shop instead.







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        B18 flywheel questions 120-130

        posted by  volvorelix on  Mon Apr 10 11:03 CST 2023
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        last visit: Thu Oct 23 21:56 CST 2014
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        That's not exactly what I said. As you may recall, I said that some do have a very slight step, less than 1/8." I also said that many are flat, and that if yours is flat that you shouldn't have any trouble getting the clutch to work, if that's the concern. Regarding dowels, I said that I've seen a number of flywheels in which the dowels had been removed for resurfacing and never replaced.

        Good to see that you now have useful information that won't lead you to post the laughing emoji. I'll see myself out.

        Best,

        Cameron
        Portland








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          B18 flywheel questions 120-130

          posted by  fervus on  Mon Apr 10 11:27 CST 2023
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          last visit: Sun Sep 23 01:37 CST 2012
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          Cameron,

          I promise I was laughing at the situation in general and not at you or your advice. You and Eric were both very helpful and I appreciate your time greatly.

          For whatever reason, my takeaway from our conversation was that they should all be flat, so I apologize for misconstruing what you said about that.

          I actually am really glad that I listened to you though because the first flywheel I brought in didn't have the recess in the middle that the new clutch kit would have needed and the flat one did.

          Ended up saving me money and time and Lord knows I don't have enough of either one these days.

          Anyway. I'm sorry if it seemed like I was laughing at you or your advice. Wasn't my intention.

          Btw it turned out beautifully. I forget how pretty these engines are when they aren't covered in grime.

          https://imgur.com/gallery/ZZ8xr20






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