B mod cooling

[mercguy]

Ive got one more question just in case.. Ive noticed that on my 1 to 1, older short skeg - multi inlet hole foot theres a bushing on the top mount surface where the cooling tube goes in about 1/8 to 1/4 and stops. On another 20H tower I have around the tube sticks out of the bottom about 2 in and has a slanted cut facing back towards the waterpump housing. Which of these types should be used for a long skeg single hole foot or are they interchangable? Thanks, Mike

Mike, where the brass water tube enters the lower unit, there is a rubber grommet on top, then the bushing on the bottom. You can interchange lower units. The tube length varied over the years and the slant is not a factor, as the channel is much deeper than the tube depth. Hope this makes sense......

BTW, with the use of the tapped fittings on the adaptor plate, you will know exactly how much water is going to the powerhead by flow and visualization......

[JohnsonM50]

Mike, where the brass water tube enters the lower unit, there is a rubber grommet on top, then the bushing on the bottom. You can interchange lower units. The tube length varied over the years and the slant is not a factor, as the channel is much deeper than the tube depth. Hope this makes sense......

BTW, with the use of the tapped fittings on the adaptor plate, you will know exactly how much water is going to the powerhead by flow and visualization......

Thanks Daren