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 Posted: Oct 6, 2018 05:51PM
 Edited:  Oct 6, 2018 05:53PM
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I would change the topic to thinning a c-ring if I could, because that is what I did.  Here's some images of what I did to accomplish it.  It seemed a little weird at first, but totally worked.
I purchased a sanding pad thing that goes into a drill and used some double faced tape to adhere it to the pad.  I did sand down the pad to make it smoother.  Then I used 400 grit sand paper and a wood block to move the sand paper around.  I did use a drill press, not a cordless drill.

Jamie

 Posted: Oct 6, 2018 11:47AM
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Bevel towards block. To clear the crank radius.

Kevin G

1360 power- Morris 1300 auto block, S crank & rods, Russell Engineering RE282 sprint cam, over 125HP at crank, 86.6HP at the wheels @7000+.

 Posted: Oct 5, 2018 06:05PM
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Thanks for all the replies everyone.  The piece that I’m reusing is the “C” ring, not the thrust washer.  In my first post I mentioned I bought a new thrust washer.  
Unfortunately I don’t have access to a machine lathe.  I do have access to a drill press.  I think I’m going to buy a sanding attachment for a drill at Harbor Freight and hot glue the c ring onto it.  Then put it in the drill press and carefully push it into a sharpening stone.  I figure I need to take off about .005” for it to fit right.  I also figured it would be safer to take material off the c ring then it would the thrust washer.  Let me know if you think I’m crazy.
BTW, which side does the bevel go towards?  Primary gear or block?
Jamie

 Posted: Oct 5, 2018 04:26PM
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Quote:
Originally Posted by Alex
Quote:
Originally Posted by Jamison70
I am trying to re-use the one from my 998 donor engine.  However, without the trust washer installed, the C ring fits.
998 and 1275 have different sized thrusts.
You can bore 998 thrusts out carefully on a lathe... I have done heaps like this.

Kevin G

1360 power- Morris 1300 auto block, S crank & rods, Russell Engineering RE282 sprint cam, over 125HP at crank, 86.6HP at the wheels @7000+.

 Posted: Oct 5, 2018 01:44PM
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US
just a thought... For the Primary gear, Measuring thrust , would or could you also ' sand the front of the primary gear bush? its 'sintered bronze?  Soft?  

Just a thought? 

 Posted: Oct 5, 2018 04:45AM
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US
That's why I ask, you are not dealing with a crank thrust washer but a primary gear thrust washer. As suggested be sure you are installing right way around. Also mentioned it would be nice to have that problem. I keep a MK1 sliding door glass with different grades of emery paper spray glued to both sides. With a mike or dial caliper, you can sand a little and check for parallel and thickness. A machine shop won't have a good way to do it otherwise. Shoot for the low side of spec, with 1275s getting within spec at all can be a challenge. Steve (CTR)  

 Posted: Oct 5, 2018 04:22AM
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GB
Quote:
Originally Posted by Jamison70
I am trying to re-use the one from my 998 donor engine.  However, without the trust washer installed, the C ring fits.
998 and 1275 have different sized thrusts.

 Posted: Oct 4, 2018 10:07PM
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Oh, you're talking about the primary gear thrust on the snout of the crank. I've never had one that didn't fit because i was too thick. Usually there is too much slop because they are too thin and I've found that using a new C washer will help.

If you use an Old C washer, they are often worn/hammered with 2 divots where they hit the crank slots and you can flip them to play with the available clearance.

Also, pay attention that the thrust washers are beveled. Try flipping it around the other way (bevel goes inwards)

 Posted: Oct 4, 2018 06:18PM
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I am trying to re-use the one from my 998 donor engine.  However, without the trust washer installed, the C ring fits.

 Posted: Oct 4, 2018 05:00PM
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I need to take off the thickness of a piece of paper... maybe.  do I take some off the primary gear C ring?  I can’t fit the C part in.  Do I need to take it to a machine shop?

 Posted: Oct 4, 2018 04:49PM
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reuse an old one on the pulley side, have the new one take the pressure when you are pushing on the clutch.

Done this many times to get the float I like

 Posted: Oct 4, 2018 04:32PM
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US
What crank and block are you working with? There are different combinations that work together. Have you determined how much needs to come off? Steve (CTR)

 Posted: Oct 4, 2018 03:52PM
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I purchased a .112-.114 trust washer,which is the thinnest one they sell, and it’s still too thick.  What do I do now?  Do I need to take it somewhere and get it machined?

Jamie