Older outboards

[CaptainKev]

I recently inherited a couple of older Johnson outboards. One is a 1955 5.5 H.P. Model CD-12 and the other one is a 1968 9.9 H.P. Model 10RCRA. I have no history and no manuals on either of these. Before I spring for a couple of manuals, I would like to see if either one is worth investing in. I need to know the gas/oil ratio for both and is there a general protocol for starting these engines? I have never owned an outboard, so any help and advice will be appreciated.

 

[F_R]

Re: Older outboards

They are both good, well respected motors. Your 9.9 is a 1984, not '68. Condition is everything. Can't advise you on that. But the '55 is likey to need coils and a water pump at the least.

The '55 takes a fuel mix of 24:1 and uses a pressurized gas tank.
The '84 takes a fuel mix of 50:1 and uses a non-pressurized tank.

Owners' manuals are not that expensive and worthwhile for somebody that has no experience. Service manuals will set you back a few bucks, but are worth it if you plan to do your own work. www.outboardbooks.com has both

 

[CaptainKev]

Re: Older outboards

Thanks F_R.....you're right about the year of the "newer" unit. All I need to check out at this point is that they even turn over. Both motors came with an Alumacraft 14' Jon boat that's in very good shape. I suspect the boat and the 9.9 H.P. motor are a matched pair. I have no idea what the 5.5 H.P. was used with. Both units appear to be in good condition with no visible impact damage. I appreciate the link for the manuals, I'll be ordering a pair of Owner's Manuals in the next few minutes.

 

[tashasdaddy]

Re: Older outboards

one thing that is left out in these, is compression check. without compression the rest is a waste of time, unless you plan a total rebuild.

read these http://forums.iboats.com/showthread.php?t=158086

http://forums.iboats.com/showthread.php?t=158071

http://forums.iboats.com/showthread.php?t=167352

 

[CaptainKev]

Re: Older outboards

Since the fuel systems are different on both of these engines, I have a question regarding the tank. The tank that came with both motors is a 6 gal. steel OMC tank with a 6 VDC sender & Johnson adapter. The tank cap resembles a radiator cap, except is does not appear to be vented. The tank has instructions for a 50:1 gas mix for Johnson engines. My best guess, at this point, is that it was used for the 9.9 engine, but how do I tell if the tank is pressurized, or not. I don't see anyway for the tank to vent other than possibly Through the fuel intake hose assembly. That particular assembly has a single hose with a male & female adapter with a pump bulb in between. It fits both engines. Any advice will be appreciated.

 

[CATransplant]

Re: Older outboards

A previous owner may have installed a fuel pump on the 5.5. If it has the two prong fuel connector, that's probably the case. They still require different fuelil ratios, as described above.

The 9.9 is an excellent, very desirable outboard, and would match with your boat very nicely. The 5.5 is not as desirable, although many folks own and use them.

The OMC tanks vent themselves automatically.

 

[Rick.]

Re: Older outboards

Just curious but why would it say 6VDC on the tank? I'm not aware of any OMC portable tank that has electrics in it. Is the writing factory looking or is it something somone has written on it? Rick.

 

[flatheadlakemonster]

Re: Older outboards

In my experience 6VDC stands for 6 Volt Direct Current, and refers to a 6V system on an older car. I have no idea how that would relate to your outbaord motor, though.

 

[CaptainKev]

Re: Older outboards

Thanks guys for all your help. The 6 VDC was somewhat of a guess.....the tank adapter has an additional three pins that don't appear to be used with the hose I've got. When I move the tank around it sounds like a fuel sender flopping around. Part of the information on both sides of the tank is worn off but I can see 6V. I Looked again, with better lighting, it may be the model number. The fuel sender noise is probably the tank cap tether. Next question.....so what are the other three pins for? Two of the pins are spring loaded that indent into the connector body and the remaining pin has a hole going through the side of it.