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  #1  
Old 12-23-2004, 10:10 PM
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Location: Western Washington
Posts: 504
Question Carburator type on a W114- 1971 250

I have been posting lately about this poor running 130.92 engine. At first I thought I had 2 Timing scales, but I don't, so the timing is not the issue.
So now I suspect the carburators.
They look like 34-4 INAT Zenith Carburetors, but when I removed the float to access the needle (screw in nut), it is stamped 'SOLEX'.

What gives? Do I have Solex carburators?

BTW the Stage 1 and Stage 2 main jets are stamped '90' and '110', which is applicable for the Zenith carbs.

And the symtom is no power. Previously PSFred mentioned a possible vacuum leak, but I have triple checked, and can't find any. I even blocked the vacuum port to the windshield washer pump ( I think it is for the windshield washer pump)
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1970 280S M130 engine- good runner
1971 250 M130 engine- #2 rod bearing, gone
1971 280SE (blown engine,parts car)
1977 German 280S W116-only 33 years old

Last edited by MunichTaxi; 12-23-2004 at 11:37 PM. Reason: correction
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  #2  
Old 12-23-2004, 10:53 PM
300SDog's Avatar
gimme a low-tech 240D
 
Join Date: Jan 2003
Location: central ky
Posts: 3,602
Opening a can of worms?? I'm not the smartest guy in the world but can swap most parts with new on practically any Vintage MB. Yet fine tuning carbs is something I wont touch.

Are you sure that a professional tune-up is not the way to go?
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  #3  
Old 12-23-2004, 11:12 PM
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Location: Western Washington
Posts: 504
Another symptom

Part #99 is the PreAtomizer for the Zenith carbs. I visually noticed that when I increased the rpm's, the gas coming out of the PreAtomizer was heavy in volume, and kinda spurted out. Should it be 'Atomized' as it leaves the PreAtomizer?

The needle and seat seem good, because when I force air down the gas port, no air escapes when the needle is closed.

Guess I better check the float height next.
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1970 280S M130 engine- good runner
1971 250 M130 engine- #2 rod bearing, gone
1971 280SE (blown engine,parts car)
1977 German 280S W116-only 33 years old
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  #4  
Old 12-23-2004, 11:30 PM
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Join Date: Aug 2004
Location: Western Washington
Posts: 504
Just took off the PreAtomixer...

and I found the center part is mis-shapen, like somebodby pinched the tube with pliers. The top edge is gouged, also.
I noticed the PreAtomixer for the secondary is in pristine condition, so I can swap them.
I wonder what I'll find on the second carburator, tomorrow?

Oh, the last time I had a 'mechanic' work on my car, he forgot to tighten a brake line, and brake fluid was all over the new brake shoes.
__________________
1970 280S M130 engine- good runner
1971 250 M130 engine- #2 rod bearing, gone
1971 280SE (blown engine,parts car)
1977 German 280S W116-only 33 years old

Last edited by MunichTaxi; 12-23-2004 at 11:33 PM. Reason: addition
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  #5  
Old 12-24-2004, 12:37 AM
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Location: Raleigh, NC currently residing in KL, Malaysia
Posts: 460
Hello,
Solex=Zenith=Pierburg=DVG, all the same, guvnor
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Nachi11744
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  #6  
Old 12-24-2004, 09:36 AM
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Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,316
I have spare carbs and enjoy giving away parts. Let me know what you need.
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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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  #7  
Old 12-24-2004, 05:07 PM
250 Coupe's Avatar
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Location: Des Moines, WA
Posts: 743
MunichTaxi, how far away is Des moines or Federal Way for you? I'm at 272nd and hiway 99 and have a strong running 1971 250C with the 130.923 motor if you want to take a look at it. I also have the factory manuals on CD.

Michael
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1971 250C 114.023 Sadly, it's been sold. I will miss it.
1976 450SEL 116.033 Maybe not so sadly, it's also gone. It was beginning fall apart more than I was willing to put it back together.
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  #8  
Old 12-24-2004, 06:02 PM
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Location: Western Washington
Posts: 504
Appreciate the offers

Michael, I've decided to rebuild the carbs, the new spark plugs are extremely blackened after 10 miles. If that isn't successful, I do have a W108 to compare the Preatomizer output.

Chuck, I can let you know in a couple of weeks if I could use some carburators. Thanks for the offer. BTW, are the W8DC Bosch spark plugs hotter than W7DC plugs?

when I got it (in the summer) it had been sitting for 3 years. It seemed to run OK, though 'rich'. I wonder by running it, if the symptom of running rich, as only gotten worse.

The only other thing I did was replace the 0.6 ohm ballast resistor with a 0.4 ohm. (so it has 2@ 0.4 ohm ballast resistors, not the 0.4 and 0.6 as specified)
__________________
1970 280S M130 engine- good runner
1971 250 M130 engine- #2 rod bearing, gone
1971 280SE (blown engine,parts car)
1977 German 280S W116-only 33 years old
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  #9  
Old 12-25-2004, 04:46 AM
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Join Date: Dec 2004
Posts: 15
i have carbs for sale

well u mayb in luck my car is a 72 250 and my zenieth carbs were running great-the car has 53,000 orig miles i just swaped them for the weber carbs becuase i like to spend money and have a nice toy-by the way the weber carbs and the pertronix module pat 1867 make the car run like an airplane for your info-i can let my carbs go for 100.00 if interested
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  #10  
Old 12-25-2004, 04:47 AM
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Join Date: Dec 2004
Posts: 15
Quote:
Originally Posted by 250 Coupe
MunichTaxi, how far away is Des moines or Federal Way for you? I'm at 272nd and hiway 99 and have a strong running 1971 250C with the 130.923 motor if you want to take a look at it. I also have the factory manuals on CD.

Michael
hey im interested in the shop manuals on cd if they r applicable to a 72 250 6 cyl?
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  #11  
Old 12-25-2004, 07:15 PM
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Location: Des Moines, WA
Posts: 743
Quote:
Originally Posted by chaunsy
hey im interested in the shop manuals on cd if they r applicable to a 72 250 6 cyl?

Chaunsy, check your PMs.

Michael
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1971 250C 114.023 Sadly, it's been sold. I will miss it.
1976 450SEL 116.033 Maybe not so sadly, it's also gone. It was beginning fall apart more than I was willing to put it back together.
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  #12  
Old 01-04-2005, 11:35 PM
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Join Date: Jun 2001
Location: Northern Calif. (Fairfield Area)
Posts: 2,225
The 72 Xenith is a 32/ 40 and the 71 is a 35/40. The zenith on the 72 was designed for the lower compression engine to run on regular in 72.

Peter
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