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Begin OCR Text:
P
th8 di8phragm is pulled downwards and fu8l drawn
up to the pump. When the rocker 8rm returns, the
diaphr8gm is pressed upwards by a spring (15, Fig.
17) and fuel is fed to the float chamber in the
carbureMor. When the level in th8 float chamber
is sufficiently high, the float valve cIoees and the
pressure in the delivery line rises until the pressure
on fhe upper side of the diaphr8gm 8Kceeds the
Gpring pressure and pumping action ceases. The
red arrows on Fig. 17 show the path followed
by the fuel.
COOLING SYS7EM
The cooling system, Fig. 18, is of the pressure
, _ type with a circuIation pump (F_ig. 19).
' When the engine is cold, the cooling water only
',_'f'__'3 circuIates through a by-pass pípe (4, Fig_ 2O)_
_ F__g. __. F_e_ pump When the engine warms up, the thermostat begins
_ _D _ _ to open th8 outlet to the radiator When tfe th$r-
1. ROt gr arm . 8S Bf b ' _ d b
_ _. p_in __. go__ w__h wagher mostat is fully opened, the y-pass is c ose y
T 3. Washer 12. Cover the spring-loaded valve disc on the underside of
4_ _ever 13. OutIet valve ehe ehermogeae go that a__ ehe coo_ing waeer hag
5_ RUbber se8I 14 UppBr pump hou__ing e th h eh d_ e (F_ __)
' o p8ss roug e ra 18 or Ig. .
G. W8Sher 15. C3Iaßhlagm SprIng wh._ h . . . . _ e. . e _
p ij_ h __ _ _ _ i e t e angine iS rUnning, CifCU a ion is Con ro -
. Iap r8__ lU. e Urn Sprlng
g. _n_ee va_ve __. _jder led by the thermoetat so th8t the engine tempera_
9. Strainer 18. Lower pump houging ture is m8intained within the correct limits. The
'_
__ fig. 18. Cooling _y_t_m
' '__ _ 2-9
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