My original reason for wanting to install a Thru-hull Raw Water
fitting and Seacock was to try to circumvent an overheating
issue I am having with the raw water
pickup/cooling circuit in my Volvo-Penta 280 Outdrive but I've figured out what the problem is and have decided to fix it properly.
A $6 plastic bushing commonly referred to as the Pivot Tube Bushing (p/n 11 in this diagram
) is evidently worn, damaged, or missing. It is allowing the Pivot Tube or Steering
Knuckle shown in the same diagram as p/n 22 to move/oscillate, causing damage to the Hose Connection Gasket
p/n 28, causing air to enter the cooling water
flow when up on plane, resulting in the overheat issue.
To fix the problem, the outdrive must be removed and partially disassembled. Taking the boat
in next week to have the work done properly instead of trying to circumvent the problem by installing a Thru-hull pickup. Will have other maintenance
items (Bellows, U-joints, Bearings, etc.) checked/replaced that are accessible when the drive is off as a precaution. Even though I really can't afford it right now, might as well fix it right or you know it will damned well cost a lot more down the way.
Thanks to all that have replied trying to help - you have a great Community here.