What is/where to get the "olive" - Alfa Romeo Bulletin Board & Forums
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post #1 of 26 (permalink) Old 08-20-2019, 11:12 AM Thread Starter
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What is/where to get the "olive"

First time poster :-) For some background, we just bought an '84 Spider and have been going through some of the systems, doing general maintenance, and figuring out what to replace in the off-season. Our Spider has the (apparently classic) gentle thud-thud-thud on hard take-offs from a stop, emanating from somewhere just behind the seats under the car. I can't say that I've isolated the problem, but the center bearing bushing is definitely sloppy and likely contributing to the issue.

To cut a long story short, while the drive shaft is out to replace the center bearing and bushing, I am planning on having the shop replace the giubo and U joints. After doing some reading, it looks like the top hat bushing, top hat internal rubber buffer, and "prop shaft front rubber bush" might as well get replaced at the same time. See diagram on the Classic Alfa site for nomenclature: *classicalfa.com/propshaft-parts-diagram/*

I've read about the "olive" piece and am trying to figure out if the "prop shaft front rubber bush" above is the same part? Any clarifications would be much appreciated. Thanks!
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post #2 of 26 (permalink) Old 08-20-2019, 12:02 PM
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The "olive" is the end of the gearbox output shaft.

Rich Hanning
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post #3 of 26 (permalink) Old 08-20-2019, 12:06 PM Thread Starter
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Originally Posted by 65Sprint View Post
The "olive" is the end of the gearbox output shaft.
I've searched the Classic Alfa gearbox section (and other sites) for this olive piece, but there doesn't appear to be anything remotely similar. Where can I find one? Or is it somehow integrated into the output shaft?
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post #4 of 26 (permalink) Old 08-20-2019, 12:14 PM
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It is the end of the shaft. It is not a separate component. Most replace the shaft if the olive is worn. I've been working on a "better" method for some years. I might have the fix now. This is not on my list-of-things-to-re-engineer today, but I'll know by this winter. For now, if it's shot, replace the shaft.


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post #5 of 26 (permalink) Old 08-20-2019, 12:22 PM
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The olive is the round end of the output shaft. That is, it is part of the machined shaft, not a separate part. You'll see it when you remove the front section of the drive shaft and notice that it fits in the "top hat" bushing. If lubrication is lacking and/or misalignment occurs, this round end of the output shaft can wear and cause vibration (reportedly). The original gearbox in the '88 Spider had about 160k miles on it when rebuilt. There was some wear on the "olive" but it did not cause any problems. Hopefully, yours is fine.

Gordon, you type too fast...

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post #6 of 26 (permalink) Old 08-20-2019, 12:35 PM Thread Starter
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Thank you! Motor is at about 101k miles, so I'll hope that this will not require replacement.
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post #7 of 26 (permalink) Old 08-20-2019, 12:36 PM
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It can be welded up and re-ground by someone who knows what he is doing.

Ed Prytherch
79 Spider
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A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #8 of 26 (permalink) Old 08-20-2019, 02:50 PM
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Do yourself a favor and replace the rear tranny mount while you're at it.
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post #9 of 26 (permalink) Old 08-20-2019, 03:48 PM
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If you replace the tranny mount then measure the OD of the new one very carefully and compare it with the one that came out. Many of the aftermarket ones are oversize and will crack the housing. I would not replace one that looks OK.

Ed Prytherch
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A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #10 of 26 (permalink) Old 08-20-2019, 06:04 PM
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If your olive looks like this, it's probably time to replace the output shaft.
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post #11 of 26 (permalink) Old 08-20-2019, 06:53 PM
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Thumping when you take off from behind the seats is u joints.

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 #12 of 26 (permalink) Old 08-20-2019, 06:58 PM
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Or the center bearing support

Ed Prytherch
79 Spider
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A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #13 of 26 (permalink) Old 08-21-2019, 10:25 AM Thread Starter
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Thanks everyone. Good pointer about oversized tranny mount. Would reputable suppliers sell a known mis-sized part?

Also, I'm having trouble viewing attached pictures - all I see is bold text that says "Attached Images". Does this have to do with my post count?
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post #14 of 26 (permalink) Old 08-21-2019, 10:36 AM
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I have replaced 3 motor mounts in gearboxes this year with ones bought from Centerline. No issues. YMMV
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post #15 of 26 (permalink) Old 08-21-2019, 10:52 AM
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Quote:
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I have replaced 3 motor mounts in gearboxes this year with ones bought from Centerline. No issues. YMMV
Mine came from Centerline and fit perfectly as well.
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