Front axle adjustment - Alfa Romeo Bulletin Board & Forums
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post #1 of 17 (permalink) Old 06-18-2019, 06:25 AM Thread Starter
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Front axle adjustment

Hello!
Finally I put the front axle in my car. The lower whishbones are already in place, the upper ones will be soon.
I do have a question about the adjustment.
In the manual it states that after the screws tightened the wishbone must fall down just by its own weight.
This is not happening. I can easily pull it down with my hand, but it does not fall on it's own.
On the upper wishbones it works until I screw the nut too tight. The nut on the upper wishbone must be secured anyway, so why tighten it too much?
Am I wrong here or what needs to be done?

On the other hand: how can I differentiate the left frome the right stub axle? Both show the same part number 1365.45003...
Thank you! Michael
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post #2 of 17 (permalink) Old 06-18-2019, 07:40 AM
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Are you using new pivot seals and shims or reusing the originals?

The right side stub axle has a right hand thread on the spindle nut, left side has a left hand thread.

Joe
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post #3 of 17 (permalink) Old 06-18-2019, 09:31 AM Thread Starter
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I use new seals and the original shims on the original location
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post #4 of 17 (permalink) Old 06-18-2019, 01:29 PM
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Does it move freely without the seals?
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post #5 of 17 (permalink) Old 06-18-2019, 09:15 PM Thread Starter
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On the bench yes.
Should I try to take it out of the car disassemble it, remove the seals and mount it to the car?

On the upper wishbone it moves freely until I tighteten the nut with max power, but as there is a securing shim for the nut I could loosen it a bit so it's more free and then secure it again....
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post #6 of 17 (permalink) Old 06-19-2019, 03:43 AM
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Yes, I think that is what you need to do.
You may have some misalignment at the pivot shafts.
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post #7 of 17 (permalink) Old 06-19-2019, 07:36 AM Thread Starter
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And how do I find out if the shim thickness is correct? Is there a way to measure that?
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post #8 of 17 (permalink) Old 06-19-2019, 09:30 AM
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Only the drop test that I am aware of.
If you can achieve that without the seals, then I think you are good. I suspect the reproduction seals are stiffer and thicker than the originals.
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post #9 of 17 (permalink) Old 06-19-2019, 11:32 AM
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There are multiple combinations of the 4 support with studs and 4 supports with holes if you allow that to happen. Your comment about losing track of which stub axle goes where raises a yellow flag and leads me to believe you have shuffled the support pieces too and arbitrarily mixed and matched thinking they are all the same spec.. That is probably not a good thing as the shims are fitted to each specific combination of supports that were in place at the time of dismantling assuming that was how they left the factory. I'm sure they were trial fitted in the factory to get the right shim thickness so you probably have to retrace your combinations to get everything back where it should be. just my 2 cents. The precision of a machined part goes only to the limit of the machine and the tolerances are taken up by the varying the thickness of the shims. Your seals have nothing to do with the problem you are encountering. Now it is back to musical chairs until you get the right combination of what was there when you started..I hope you kept track of what sided and corner (4) the shims went on and what shims they were on each corner..you have 8 to unscramble if you didn't. A thick shim would cause tightness where it shouldn't be and a thin shim would cause looseness where it shouldn't be.

Last edited by divotandtralee; 06-19-2019 at 11:41 AM.
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post #10 of 17 (permalink) Old 06-19-2019, 12:56 PM Thread Starter
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The wishbones were disassembled machined and assembled right away so everything stays on it‘s original place.
The stub axles weren‘t
I exchanged the whishbones between left and right, that made it worse.
So I am quite sure the left is left and the right is right, and all shims are on their correct ‚from factory‘ position.

So if a positive fall down test is a must then I really have to start over. If fall down with a little help is fone, I am fine
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post #11 of 17 (permalink) Old 06-19-2019, 01:07 PM
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Sindles mixed up?

Here is the note I made when I took my Sprint apart:
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post #12 of 17 (permalink) Old 06-19-2019, 01:16 PM
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Here is procedure you might try to determine proper shims (assumes you are starting with just installing the A-arms / wishbones ….. no spindles, springs, etc.)
To determine what thickness shim washer to use, proceed as follows:
• Remove both 2-piece supports from A-arms
• Remove shim washers from supports
• Remove cup seals from supports
• Measure shims and find two that are the same thickness
• Install those two shims on the support with pin.
• Install pivots to chassis (support with pin go on inside)
• Hold A-arm up to pivots.
• If the A-arm does not “just slide into place”, then adjust the 2 shim washers to next larger size.
• Once the inner shims are adjusted (thus centering the A-arm), determine required outer shims to “just fit”.
• Tighten support pin's nut and verify that the A-arm moves up- down freely, but not side-to-side.
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post #13 of 17 (permalink) Old 06-19-2019, 01:22 PM Thread Starter
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Sounds great carl, thank you
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post #14 of 17 (permalink) Old 06-19-2019, 10:04 PM Thread Starter
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•If the A-arm does not “just slide into place”, then adjust the 2 shim washers to next larger size.

Means if it falls down I go thicker, if it stays up I go thinner, right?


Same for the upper whishbones?
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post #15 of 17 (permalink) Old 06-20-2019, 03:38 AM Thread Starter
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So, lower whishbones are fine now. Thank you carl, like always, you have been of great help to me.
On the upper ones I still face some trouble.
On the bench they turn beautifully, as soon as I put the inner support assembly together it gets much tighter... Mounted in the car it's a bit better but not near sliding...
When I then tighten the outer 22 nut it's getting worse...
The shims are all betwee. 2,025 and 1,975
Can I really compensate that with a clever reassembly or am I doing something wrong?
Thank you
Michael
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