Thread subject: Whaler Central - Boston Whaler Boat Information and Photos :: Repowering, fuel tank and general info. question
Posted by tbranton on 07/25/16 - 7:39 AM
#1
My
1987 Montauk is going into the shop for a repowering. Gone is the original Johnson 88 and a new Yamaha F70 is going on. Two questions: the old motor did not have an oil pump but was a premix engine. So, there has always been gas and oil in the tank. Should (or can) I retain the old fuel tank? Secondly, aside from engine, controls, prop, anything else I should watch or ask about during the repowering. My thanks in advance to anyone who can share their thoughts on the process. Regards, Tom
(changed abbreviated year to full 4 digit year per guideline #1 at the top of this page)
Edited by Joe Kriz on 07/25/16 - 12:38 PM
Posted by tmann45 on 07/25/16 - 8:42 AM
#2
tbranton wrote:
My 1987 Montauk is going into the shop for a repowering. Gone is the original Johnson 88 and a new Yamaha F70 is going on. Two questions: the old motor did not have an oil pump but was a premix engine. So, there has always been gas and oil in the tank. Should (or can) I retain the old fuel tank? Secondly, aside from engine, controls, prop, anything else I should watch or ask about during the repowering. My thanks in advance to anyone who can share their thoughts on the process. Regards, Tom
Yes you can use the old fuel tank. It would be best to drain all of the premix out and start with fresh gas, but if the premix is not that old it will not kill your new motor, just dilute as much as possible.
Gauges and read the owners manual before starting to break-in the engine.
Posted by Phil T on 07/25/16 - 9:35 AM
#3
Mount the motor 3 holes up. Do NOT let the dealer dissuade you. This is specific guidance for Boston Whaler hull and the F70 specifically.
Reference article explaining engine mounting position:
http://www.whalercentral.com/articles...cle_id=106
Use a quality stainless steel prop. The Yamaha painted stainless or Performance series are good. The PowerTech SCD3 is also well recommended for the F70
Yamaha Performance Series 3-1/4" x 14
PowerTech SCD3 in 16" pitch.
Posted by MG56 on 07/26/16 - 4:22 AM
#4
If the fuel tank is fiberglass I wouldn't use it.
Posted by tbranton on 07/26/16 - 7:02 AM
#5
My thanks to everyone for their thoughts and suggestions. It's very much appreciated.
Tom