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_ __ __ _ _ __ _ P Fig. 19. W8ter pump 1 Housing 5 Shaft w_tf b8ll _ Impeller bearings (integral unit) 3 Sealing ring 6 Hub 4 Locking spring ', distributing pipe in the cylinder head (3) ensures '_ uniform cooling of the warmest parts in the cy- ' linder head. The parts around the spark_ng plugs are also cooled and thereby maintained at a constant temperature The cool_ng water which surrounds the cylìnder walls is c_rculated through _ _hermo-g_phon ac__on ',-2,' ,,T',h',,e','r',;',o',s',t,,a't,'',',,, '5 W''a-t'e'r''Pu'_'P' 2', 'T,h',,e','';;',o',';;;'t,'',',,e '5 W''a-t'e'r''P_'1_'P'
 
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