Re: My 49 mercury water pump
If the 8CM pump has the hole for the oiler cup then it is an early 49 type. The OCM pumps were used through 1951 and had the sealed bearing/shaft assembly. Previous rebuilders may have converted the 8CM pump to the later configuration. Sometimes it is hard to tell the 8 from the 0 in the part number unless you beed blast them.
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