Pinion contact thoughts.
#2467720
03/17/18 01:24 PM
03/17/18 01:24 PM
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Joined: Feb 2005
Posts: 2,709 NJ central
Scamp408
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Factory gears bl .008. Factory shimm.
Last edited by Scamp408; 03/17/18 01:28 PM.
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Re: Pinion contact thoughts.
[Re: Scamp408]
#2467773
03/17/18 04:14 PM
03/17/18 04:14 PM
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Joined: Dec 2005
Posts: 11,408 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
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Posts: 11,408
Fulton County, PA
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Pull the pinion out .008 or .010 and see what it looks like.
If the results don't match the theory, change the theory.
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Re: Pinion contact thoughts.
[Re: Cab_Burge]
#2471559
03/24/18 10:01 PM
03/24/18 10:01 PM
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Joined: Mar 2006
Posts: 9,791 MI, usa
dvw
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Move the pinion deeper into the ring gear some more Not a bunch Good luck, take the time and effort to get it so you really like it I disagree. Pattern is still to far into the root. Pinion shim still looks to thick. I agree, don't quit until it is right. Doug
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Re: Pinion contact thoughts.
[Re: dvw]
#2471597
03/24/18 11:32 PM
03/24/18 11:32 PM
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Joined: Jan 2003
Posts: 6,591 Canton, Ohio
Sport440
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Canton, Ohio
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Move the pinion deeper into the ring gear some more Not a bunch Good luck, take the time and effort to get it so you really like it I disagree. Pattern is still to far into the root. Pinion shim still looks to thick. I agree, don't quit until it is right. Doug I say deeper as well, but op could help by making sure he gets better readable pattern marks. The pattern is looking better with the .010 shim.
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Re: Pinion contact thoughts.
[Re: Scamp408]
#2471839
03/25/18 03:40 PM
03/25/18 03:40 PM
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Joined: Dec 2005
Posts: 11,408 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
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Posts: 11,408
Fulton County, PA
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Usually, using the shim that came out of it to start will get you pretty close, especially with a factory gear, and as long as the guy before you did it right. Actually, the first pics weren't that far off. I said "pull the pinion out .010" meaning to pull the pinion out of the gear, which would require you to reduce the shim thickness. I expected it to be close or a little over center requiring you to put a few thou back in. If I read it right, you added .010, then added .005 more until it was way deep. Then the last pics were with a .075 shim pack which is not deep enough. You've lost the rabbit, not hard to do.
Put an .084-.086 shim pack in it, just to get back on track. It may be pretty close. An accurate read on the pattern requires that you take time to get the backlash and the pinion preload very close to being correct each time. Set-up preload can be achieved by putting it together with no shims,and tightening the pinion nut until the desired turning torque is achieved. On final assembly, put the correct preload shim pack in to get that torque number used in set up. A PITA with a Dana, but you gotta do it.
If the results don't match the theory, change the theory.
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Re: Pinion contact thoughts.
[Re: Scamp408]
#2472486
03/26/18 09:00 PM
03/26/18 09:00 PM
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Joined: Feb 2005
Posts: 2,709 NJ central
Scamp408
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This is .085. Forget the 75 bearing didn’t bottom out.
Last edited by Scamp408; 03/26/18 09:01 PM.
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Re: Pinion contact thoughts.
[Re: Scamp408]
#2472510
03/26/18 09:55 PM
03/26/18 09:55 PM
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Joined: Dec 2005
Posts: 11,408 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
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Fulton County, PA
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Drive side is close. I would take a few more thou out of the shim. Coast side is also close but running off of the toe. I would take 3 or so out of the shim pack and open the BL up a few or 3 and see what that does. Pulling the pinion out of the ring gear a few and leaving the side shims alone should open the backlash some.
How are you checking backlash?
Having fun? Yeah, this is how you learn - by trying stuff and seeing what it does. When it starts doing what you think it will do, then you're catching on.
If the results don't match the theory, change the theory.
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Re: Pinion contact thoughts.
[Re: Scamp408]
#2472604
03/27/18 02:32 AM
03/27/18 02:32 AM
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Joined: Aug 2003
Posts: 43,007 Bend,OR USA
Cab_Burge
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I Win
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Posts: 43,007
Bend,OR USA
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Last edited by Cab_Burge; 03/27/18 02:33 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Pinion contact thoughts.
[Re: Scamp408]
#2474477
03/30/18 05:33 PM
03/30/18 05:33 PM
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Joined: Dec 2005
Posts: 11,408 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
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Fulton County, PA
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The .080 looks OK on the drive side. I'm looking beyond the teeth you painted to the ones further down with the compound smeared on them. The coast side is still strange except for the one tooth at the bottom of the picture, which looks OK. I would still open the backlash to .010 or so. Most of what I do gets at least 010.
Try using less marking compound. A thin coat comes off cleaner and helps with seeing what is actually going on.
If the results don't match the theory, change the theory.
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