In an effort to continue to demystify BMW's part numbers as it relates to what the part actually looks like, here are photos of a new bakelite spacer for the Zenith 35/40 INAT carburetors.
There are no less than 3 part numbers for the spacers: 13111265184 (pictured below), 13111260424 and 13111253035.
The orange books/blue binders tell us that 035 is for earlier models and show the chassis numbers cutoff. 424 and 184 continued forward with the former being designated for the 2.5(E9)/2500(E3) models and the latter for everything else: 2.8/2800/3.0. Confusingly, W&N sells 424 for all E9 and E3 models and shows a photo of it which as far as I can tell looks exactly like the 184s I bought.
I primarily purchased them to obtain a definitive seal via the O-ring on the idle circuit and eliminate that variable as I completely rebuild engine and carbs. Not as easy as it sounds to drill (mill) a flat-bottomed hole half the depth of a specific size o-ring and have it all seal on both sides, unless you have suitable equipment (a Haas TM-2P would do...). At least not without spending more than the $38 (before discounts) each spacer costs.
The pictures below show the 184 (why a Mini logo?!) and the original from my '73 3.0CS (Euro). The only difference is an extra hole on the new one which is superfluous on my Zeniths.
There are no less than 3 part numbers for the spacers: 13111265184 (pictured below), 13111260424 and 13111253035.
The orange books/blue binders tell us that 035 is for earlier models and show the chassis numbers cutoff. 424 and 184 continued forward with the former being designated for the 2.5(E9)/2500(E3) models and the latter for everything else: 2.8/2800/3.0. Confusingly, W&N sells 424 for all E9 and E3 models and shows a photo of it which as far as I can tell looks exactly like the 184s I bought.
I primarily purchased them to obtain a definitive seal via the O-ring on the idle circuit and eliminate that variable as I completely rebuild engine and carbs. Not as easy as it sounds to drill (mill) a flat-bottomed hole half the depth of a specific size o-ring and have it all seal on both sides, unless you have suitable equipment (a Haas TM-2P would do...). At least not without spending more than the $38 (before discounts) each spacer costs.
The pictures below show the 184 (why a Mini logo?!) and the original from my '73 3.0CS (Euro). The only difference is an extra hole on the new one which is superfluous on my Zeniths.
