1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 764Get this manual
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INSPECTION and CHECKS ICheck for brok n
Refer to "MerC ru ise Remo valIn la lal on nd li nm nt" ,
nREVERSE" LOCK VALVE LEAK CHECK
(Using Hydraulic Pum Test Gauge C-91-S291SA2)