1968 Evinrude Big Twin, Lark 40 HP Outboards Service Repair Manual P/N 4483, Page 67Get this manual
Quality of the image is intentionally reduced!
Fig 6-36 Checking Parallelism
i Inspect water tubes for stutis 01' which stit wt" flowjIst
water il11peller if vanes or worn excessi velyIst l11 101ISig for sig and replace i