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Flywheels & clutch functionality
Home away from home
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Im installing the new A12 engine to replace the A15 and the flywheel I had set aside and refaced turns out to be 35mm thick, the one I was running on the A15 was 28mm, apparently a A12 FW, also ran a engine plate 3.25mm & a standard ht bearing carrier 33mm, it had a problem with clutch disengagement so made a longer slave push rod, still never worked right. All coupled to a 60A 5 spd.

I had a brand new Exedy clutch & cover- man, it was hard to push! Planning on running the 28mm FW, standard carrier & no engine plate, sound right for proper clutch operation?

Wiki doesnt say anything about A15 FW's, were they 35mm thick?

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man I hate posting pic's on this site, copied links from Icloud, didn't work. Wouldn't it be easier to be able to pull them direct from our computers or ph's and not have to off site host them....my rant

Posted on: 2021/11/8 17:11
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Re: Flywheels & clutch functionality
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A15 uses the same flywheel as A14

Posted on: 2021/11/8 18:24
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Re: Flywheels & clutch functionality
Home away from home
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35mm thick? Wiki says 30mm

Posted on: 2021/11/8 19:42
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Re: Flywheels & clutch functionality
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Yes, A15 engine uses the A14 flywheel

Nissan Part Numbers (Japan Domestic Market)
* 12310-H7200 FLYWHEEL ASS'Y A14 -7909
* 12310-H7201 FLYWHEEL ASS'Y A14 7910-8010
* 12310-H8900 FLYWHEEL ASS'Y V A14S, A15 8011-
* 12310-H8910 FLYWHEEL ASS'Y A14S, A15 8011-

USA catalog shows same part numbers

The 30mm thick is just a measurement I took from a couple of A14s. Here is me measuring it
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By the way, iCloud does not do photo hosting. If you have "shared" the photo, we can use the URL and go to iCloud to view the shared photo, but it won't show up on any other web site. for example:
https://share.icloud.com/photos/0OINLZz6mp0YhFCDiv2VyFW3g

You can post the photos directly from your phone or PC. Click the "Reply" button to get the Upload button. Your photo is small enough for Datsun1200.com (only 1536x2048 pixels) but the file size is large (1.22 MegaByte). So I used STGThumb to reduce the file size (it is still the same image size). On iPhone you can use ResizeMe! or whatever is the current resize app to get the file size to under 200,000 bytes

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jpg  _IMG_5282.jpg (188.02 KB)
174_618a0551a7583.jpg 1536X2048 px

Posted on: 2021/11/9 5:21
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Re: Flywheels & clutch functionality
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That being said it seems there is yet another size of flywheel i hadn't run across

which flywheel is 28mm? The one cast 'K24C' or the one with casting marks 'H', 'II', 'L.03'?

Your photos are 3-megapixel resolution. Had to change the quality to 20% but they still look OK

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jpg  IMG_5281.jpg (119.56 KB)
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Posted on: 2021/11/9 6:10
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Re: Flywheels & clutch functionality
No life (a.k.a. DattoMaster)
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Are you running a step in your flywheel for free clamp load....or are you running a Toyo clutch?

Dattos are usually flat

Posted on: 2021/11/9 9:45
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Re: Flywheels & clutch functionality
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H-11 FE is the 28mm A12, K24C is 35mm off the A15. Doug in Portland confirmed 35mm of an A14/15 FW & a 28mm off an A12, he measured both so it looks like stock for A14/15 should be 35mm thick.

Both are stock FWs , perhaps the step was milled into it by machine shop or by whoever modified the pilot bearing hole before me. I had the machine shop turn down the bushing so itll fit.

No Toyota FW, both Datsun.

Thanks for putting up the pics Dave , maybe Ill figure out how to load them

Posted on: 2021/11/11 6:40
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Re: Flywheels & clutch functionality
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thanks i update the specs

i seem to recall the 'step' (slightly raised area) is factory stock. But not needed as the first time them flywheel is resurfaced the step is removed. Unlike certain toyo clutches it is a very slight step

Posted on: 2021/11/11 8:11
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Re: Flywheels & clutch functionality
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Funny but Rob at Action left the step on both FWs , he also turned down the pilot bushing to fit the smaller hole on the A12 FW - tapped it right in, god knows why anyone made that a smaller ID???

Posted on: 2021/11/12 16:41
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