W114 vacuum advance

[Bruno.L]

Does anyone know a good source for a replacement Bosch 1 237 121 881? It has two vacuum inlets. I realize it might not be made any more so a suitable substitute would be welcome too. If nothing else some source that rebuilds them would be welcome. As you can tell anything helps. To anyone who might have one of these, does yours have a pin hole in the front too? Mine does and that doesn't seem right. Thanks in advance folks.

[Frank Reiner]

BL:

W114 is a chassis designation. Over the span of 1968-1976 it was produced with four different engine models: M180, M114, M130, & M110.
Help us help you; narrow it down, and include pics of the distributor & vacuum unit.

[Bruno.L]

Thanks for the input. It's in a 1972 250c with the M130, dual Zenith carburetors, the Vin starts with 114 023, I guess that could help date the production period within which it was assembled in '72. It has the emissions items (don't know what they're called) on the left side fender from which the vacuum lines are routed to the vacuum advance. I tried to upload a picture but didn't work at the time. I appreciate you folks taking the time to help sorry for the lack of information. I'll try to upload pictures from a laptop.

[Frank Reiner]

Originally Posted by Bruno.L

Does anyone know a good source for a replacement Bosch 1 237 121 881? It has two vacuum inlets. I realize it might not be made any more so a suitable substitute would be welcome too. If nothing else some source that rebuilds them would be welcome. As you can tell anything helps. To anyone who might have one of these, does yours have a pin hole in the front too? Mine does and that doesn't seem right. Thanks in advance folks.

That you seek a replacement suggests that you have detected something which you have deemed a fault; what?
What operational objective do you have? For the most part the vacuum controls are present only for emission control purposes. Still required in your jurisdiction?

The very accurately located, dead center pinhole is a bleed.

Originally Posted by Bruno.L

Thanks for the input. It's in a 1972 250c with the M130, dual Zenith carburetors, the Vin starts with 114.023, I guess that could help date the production period within which it was assembled in '72. It has the emissions items (don't know what they're called) on the left side fender from which the vacuum lines are routed to the vacuum advance. I tried to upload a picture but didn't work at the time. I appreciate you folks taking the time to help sorry for the lack of information. I'll try to upload pictures from a laptop.

114.023 = 250C, 1970-1972 USA model years

[Bruno.L]

When I apply vacuum to either nipple it doesn't hold. I want it fixed because I assume the car is stumbling at low rpm, usually while trying to accelerate away from a stop sign slowly, because of this. It Is not holding vacuum normal for this type of vacuum advance? I thought the same about the uniformity of the pin hole but figured I'd ask since a hole in a device intended to hold vacuum seemed strange to me. I don't have any experience with these devices. I figured replacing it would be a good way to rule it in or out as a source of the problem

[Frank Reiner]

BL:

Herewith a suggestion that may help in determining if the stumble is timing caused or carburation caused.
Re-assemble the distributor, assuring that the centrifugal advance mechanism is working freely, and that the point gap is correct.
Install the distributor, leaving both vacuum hoses disconnected.
Set the timing to yield 33-35* BTDC @ 3500RPM.
Drive the car without vacuum to the distributor.
If the stumble persists look to carburation, or, as a rather lower probably, a very weak coil and/or ignition amplifier (switchgear).

[Bruno.L]

Thanks frank, I'll give that a try this weekend.

[cth350]

> Install the distributor, leaving both vacuum hoses disconnected.
Leaving them disconnected, but plugged.

-CTH

[Mullins61]

Hey everyone, I know this is a really old post, just wanted a understanding on the vacuum at rear Zenith and distributor On the Carb the pipe is missing, so not connected to the Vacuum, also one pipe is connected to rear of Distributor vacuum, the other is capped with tape. Can these be disconnected if no emissions controls
Thanks
Paul

[Frank Reiner]

M: See this sequence.

Originally Posted by Mullins61

One pipe is connected to rear of Distributor vacuum, the other is capped with tape. Can these be disconnected if no emissions controls?

Originally Posted by Frank Reiner

Herewith a suggestion that may help in determining if the stumble is timing caused or carburation caused.
Re-assemble the distributor, assuring that the centrifugal advance mechanism is working freely, and that the point gap is correct.
Install the distributor, leaving both vacuum hoses disconnected.
Set the timing to yield 33-35* BTDC @ 3500RPM.
Drive the car without vacuum to the distributor.
If the stumble persists look to carburation, or, as a rather lower probably, a very weak coil and/or ignition amplifier (switchgear).

Originally Posted by cth350

> Install the distributor, leaving both vacuum hoses disconnected.
Leaving them disconnected, but plugged.

[rumb]

Originally Posted by Mullins61

Hey everyone, I know this is a really old post, just wanted a understanding on the vacuum at rear Zenith and distributor On the Carb the pipe is missing, so not connected to the Vacuum, also one pipe is connected to rear of Distributor vacuum, the other is capped with tape. Can these be disconnected if no emissions controls
Thanks
Paul

2 posts for the same thing is confusing to everyone.

[Mullins61]

Sorry for any confusion caused, didn't think this would be a problem starting a new thread with pictures

[Frank Reiner]

Originally Posted by Mullins61

Sorry for any confusion caused, didn't think this would be a problem starting a new thread with pictures

Two threads are in order; one for the carbs, one for the distributor.
And if you pick up on an existing thread for either or both subjects, you will have the advantage of being able to read previous comments!

[Sugar Bear]

IIRC and FWIW, one of the vacuum ports is to advance and the other is to retard the timing.

[Mullins61]

Thanks Sugar Bear.... great name by the way, many weak people around