Spica rubber ring idle port?? - Alfa Romeo Bulletin Board & Forums

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post #1 of 3 (permalink) Old 02-12-2017, 06:52 AM Thread Starter
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Question Spica rubber ring idle port??

Dear all

Does anybody knows the specifications of the rubber ring, (Part. 115.04.623.00) wich is inside the idle port?

Ive adjusted the pump, butterflys, placed new rubbers to the equalizer, etc, but when I placed my thumb over the idle port the engine "does not stop" as Wes Ingram manual states.

I cleaned the idle port, did an action wich was recommended by Alfa Romeo (increase the hole) but the rubber ring its old and its hardened.

I tryed to buy it at Centerline, but its not available.

Here I am asking for the spec of this rubber ring in order to buying it locally or abroad.

Thanks in advance,

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post #2 of 3 (permalink) Old 02-12-2017, 09:43 AM
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If the engine doesn't stall or decrease rpm dramatically with the idle air tower blocked, the problem is, most likely, the throttle bores are not completely closed (like they should be at idle). It's also likely that the relay crank idle stop and wide-open stop screws are not adjusted to spec.

Just get an o-ring that fits inside the bore the idle air adjuster. I've found that it makes almost no adjustment in the idle speed. As long as you're getting 600-900 rpm at idle, that's good.

John Stewart
74 Spider
91 164S

Last edited by Roadtrip; 02-12-2017 at 09:46 AM.
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post #3 of 3 (permalink) Old 02-12-2017, 10:23 AM Thread Starter
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Dear Roadtrip.

Thanks for your advice, you are the expert!

You know, after writing my problem I realize that the o-ring should not be the problem . The rpm decreases when I place my thumb on the idle, but the engine doesn't stall.

For the above, I will check the throttle bores.

However, I need the specifications of this o-ring. It's a simple o-ring or it has some special requirements??

Thanks in advance


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