I have a 1978 Mercury 500, 50 HP 4 Cylinder. The impeller on it was toast so I ordered a new one. The old impeller said 65959 on it and when I went to order a new one, that part number matched up with what was on the site for my serial number. They sent me 12-89983T as a replacement part as my old part number is obsolete. I have confirmed with them that this is the correct part.
When I slide the impeller over the driveshaft it stops about a half inch above the impeller key. I tried to use some grease and it will not go down further. It's not hitting the key. If I flip the impeller over and slide it over the drive shaft, it stops about one whole inch above the key.
Everywhere I look says that this impeller is a direct replacement for my other one, yet it does not fit all the way down to the water pump base.
Any thoughts?
Thanks in advance
Sam
When I slide the impeller over the driveshaft it stops about a half inch above the impeller key. I tried to use some grease and it will not go down further. It's not hitting the key. If I flip the impeller over and slide it over the drive shaft, it stops about one whole inch above the key.
Everywhere I look says that this impeller is a direct replacement for my other one, yet it does not fit all the way down to the water pump base.
Any thoughts?
Thanks in advance
Sam
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