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COUPE
275
Cylinder Head - Valves - Guides - Springs
(continued).
.539
13.1
.823
20.9
1.468
37.3
1.109
43.4
U81
30
1.339
34
.815
20.1
.912
24.1
15.4 lbs
1 kg
46.3 lbs
21 kg
.346
8.8
spring (.)
spring
spring (.)
spring
Valve spring
I.
D.
Free length
inner
outer
inner
outer
Seated length, valve closed:
- inner spring, under 17.6±.9 lbs (8±0.4 kg) of load (.)
- outer spring, under 51.6±2.6 lbs (23.4±1.2 kg) of load
Seated length
I
valve open:
- irmer spring, under 39.7±2.2 lbs (18±1 kg) of load (.)
- outer spring, under 102.5 ±5.1 lbs (46.5 ±2.3 kg) of load
Minimum permissible load with seated springs:
- inner spring (length l.l81" - 30 nun) (.)
- outer spring (length 1.339" - 34 nun)
Valve
lift
(touch fit)
.
(") The inner spring has been suppressed starting from engine No. 425691 and reinstated from engine N0 739352 (see page 212).
FUEL
SYSTEM
CARBURETOR
Operation.
The Weber carburetor type 30 DIG 1
is
of the
dual throat design with a barrel bore of 1.181"
(30 rom).
This carburetor
is
equipped with:
- mechanically controlled choke type easy starl-
ing
device;
super-feeder device;
- accelerator pump.
From the diagram
in
figure 431
it will
be seen
that the fuel flows past the needle valve (l) into the
bowl (17), where the float controls the opening of
the needle (2) and maintains a constant fuel level:
the needle (2) is attached to the arm of the float
(19)
by
means of the return hook (20).
From the bowl (17) fuel, controlled by the main
jets (18), reaches the well (15) past the ducts (16).
13
16
17
II
I
3
4
5
6
7
8
\
9
~o
11
11
14
13
15
16
17
Fig. 431 _ Diagrammatic section views of Weber 30 ole 1 carburetor.
1. Needle valve. - 2. Needle. - 3. Calibrated bushing. - 4. Air bleed jet. - 5. Super-feeder device passage. - 6. Calibrated orifice. - 7. Super-
feeder mixture delivery passage. - 8. Calibrated bushing. - 9. Super-feeder nozzle. - 10. Discharge tube. - 11. Auxiliary Venturi. - 12. Primary
Venturi. - 13. Secondary throWe valve. - 14. Emulsion tube. - 15. Well. - 16. Main jet duel. - 17. Bowl. - 18. Main jet. - 19. Float. - 20. Float
return hook. _ 21. Float pivot pin. - 22. Throttle stop screw. - 23. Throllies control lever. - 24. Primary shaft. - 25. Idler lever. - 26. Secondary
shaft control lever. - 27. Secondary shaft. - 28. Idler lever lug. - 29. Throttles control lever lug.
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