diff rebuild - Page 2 - Alfa Romeo Bulletin Board & Forums
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post #16 of 23 (permalink) Old 07-05-2017, 08:10 AM Thread Starter
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Hi Capp

I use the anaerobic sealer wherever I can vs ultra grey. I cleaned up all the mating surfaces and they appear intact, free from voids, and flat. I intend to use the red anaerobic stuff as I think a) it will seal very well, and b) only a small amount is needed thus it ends up in a very thin layer (not impacting preload to any measureable degree) and doesn't end up where I don't want it. I;ve already sealed one diff with it and it went together just fine.

74 GTV with 10548's and Ingram pump
71 Spider 1750 BOMBER ; 1995 LS 78K tight fast car
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post #17 of 23 (permalink) Old 07-05-2017, 02:12 PM
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Jim I have an analog (circular) torque gauge (1/4inch drive) that ranges 0-75 inch /lbs. it has a pointer that shows the torque and a "max reached" needle.

I use the pinion nut tool with 1/4 to 3/8 to 1/2 adapter and measure rotational torque of the pinion.
Hi Goats,

I have the weighted bar tool for doing the preload. C.5.0100. If you need to borrow it let me know.

Jim

1969 1750 Spider Veloce w/dual webers, 1969 1750 Berlina, 1971 1750 Spider Veloce w/ dual webers, 1985 Spider Veloce 23,000 orig. miles, {Two} 1986 Spider Veloces, 1987 Spider Veloce bought new, 1988 Quadrifoglio, 1991 164S, Plus several more. I think they are breeding.
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I just got 2 more. Now I have a Matta. I must be crazy.
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post #18 of 23 (permalink) Old 07-06-2017, 10:47 AM Thread Starter
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Thanks Jim. I'll let you know if its needed -- its a pretty simple torque measurement I thought so any torque gauge (adapted to fit on the pinion nut) ought to work -- heck even a 1/2' breaker bar with a couple pints of water hanging at 12'' from pinion nut center will give 2 ft/lbs! Not as elegant as the tool no doubt but should be just as accurate...???!!!

74 GTV with 10548's and Ingram pump
71 Spider 1750 BOMBER ; 1995 LS 78K tight fast car
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post #19 of 23 (permalink) Old 07-06-2017, 11:00 AM
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Thanks Jim. I'll let you know if its needed -- its a pretty simple torque measurement I thought so any torque gauge (adapted to fit on the pinion nut) ought to work -- heck even a 1/2' breaker bar with a couple pints of water hanging at 12'' from pinion nut center will give 2 ft/lbs! Not as elegant as the tool no doubt but should be just as accurate...???!!!
I guess so. I've never used it. But the weight is set in different spots along the length of the shaft depending on what model you have.

1969 1750 Spider Veloce w/dual webers, 1969 1750 Berlina, 1971 1750 Spider Veloce w/ dual webers, 1985 Spider Veloce 23,000 orig. miles, {Two} 1986 Spider Veloces, 1987 Spider Veloce bought new, 1988 Quadrifoglio, 1991 164S, Plus several more. I think they are breeding.
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post #20 of 23 (permalink) Old 07-19-2017, 07:41 AM Thread Starter
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If you all recall the reason for these diff rebuilds, it was when I was tow dollying the car for floor pan r/r. The rear wheels totally locked up. Left matching skid marks in front of Honda dealer in Escondido which are still there!

I think I might have found a clue as to what happened --/
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post #21 of 23 (permalink) Old 08-25-2017, 11:01 PM Thread Starter
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OK I think I'm close to done if not done. Original pinion and crown gear going back into original housing --All 4 bearings replaced, 2 pinion 2 crown wheel, 2 new clutch plates, on a 4:10 LSD that will be my replacement for the 4:56 that is in the GTV presently when it starts to have problems, or, when my Spider 4:10LSD with 2 new clutch plates only and a preload reset gets noisy!

Pinion depth -- - marked -2 on the pinion, which means I should be at 58.52 face to crown center, right? It is there as close as I can measure it.

Pinion preload -- 15 inch lbs without pinion oil seal
Crown wheel added and preload -- 24 inch pounds total without pinion oil seal -- I think its a bit light but not going to stress on that.
Lash -- measured at 4 revolutions of the pinion gear -- got 7, 8, 10, 9 thou, measured per the book method at the edge of the pinion flange. The 3 thou delta bothers me a little but I don't know what to expect. Its real, not measurement error. This says that the crown wheel isn't tracing a flat perpendicular circle with respect to the pinion I think.

Thoughts? I could take it apart AGAIN and add a thou or two shim on the small end to push the crown out a little, but I am not sure how close I could ever get it without going out of the 6 to 12 thou spec. Every time I take apart and reput together, its a thou or two variable it seems. Am I close enough with what I have now? Appreciate any thoughts or advice -- When the diff starts to break in, I know preload tends to decrease, but what happens with lash? I can argue either way but if RJ is out there reading Dr Jemison what is your advice?

Many thanks to Jim G == he is the man. Could NOT have gotten this far without him without a doubt. Super gentleman.

74 GTV with 10548's and Ingram pump
71 Spider 1750 BOMBER ; 1995 LS 78K tight fast car
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post #22 of 23 (permalink) Old 08-26-2017, 08:22 AM Thread Starter
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Nice and clean! I wish there was s way to bench check if it is likely to be noisy or quiet...ideas anyone?
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74 GTV with 10548's and Ingram pump
71 Spider 1750 BOMBER ; 1995 LS 78K tight fast car
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post #23 of 23 (permalink) Old 10-21-2017, 01:57 PM
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