Topic: 1955 Fleetwin, running hot? – Page 5 – Antique Outboard Motor Club,Inc

This topic has 49 replies, 9 voices, and was last updated 9 years, 2 months ago by ray-schaber.

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June 17, 2016 at 1:24 am #38442
shoestringmariner
Participant
Beerman, I am confused too. apparently it is missing 2 plugs, but only one makes sense to me.

I get plugging the head, but If I plug the exhaust port, it appears that it would leave only 2 holes @ approx 5/16" diameter for the exhaust to flow through. I cant see how that works as the air intake ports are much larger than that. Are the exhaust gasses discharged elsewhere with this motor, or solely out of the exhaust tube? I am not doubting, I am asking so I can learn.
June 17, 2016 at 2:50 am #38455
frankr
Participant
US MEMBER PAY BY CHECK
Main exhaust outlet is underwater snout aft of the prop. The above-water discharge is an exhaust relief for better starting and idle (less back pressure on exhaust)
June 17, 2016 at 11:26 am #38463
fleetwin
Participant
US Member
quote beerman57:

I’m a little confused, I thought we were talking about plugs on the cyl. head. The picture above with “plug here” in red, is of what? I know it’s the bottom of the powerhead, but it’s not the cyl. head, right?

He is actually missing two core plugs. One on the bottom of the cylinder head, the other is the big one down inside the exhaust housing that is shown in the picture with the arrow.
June 17, 2016 at 11:30 am #38465
fleetwin
Participant
US Member
quote FrankR:

It’s real hard imagining water cooling the powerhead and not exiting that wide open hole. Why don’t you just put in a new core plug and see what happens before exploring further. BTW, I’ve seen lots of them with that plug rotted out.

I agree with Frank, don’t rip this thing apart further. Replace the core plugs, impeller, and seal components then run it again. My nickel says your problems will be solved.
June 17, 2016 at 12:24 pm #38468
shoestringmariner
Participant
quote FrankR:

Main exhaust outlet is underwater snout aft of the prop. The above-water discharge is an exhaust relief for better starting and idle (less back pressure on exhaust)

Doh…feeling sheepish here
June 17, 2016 at 12:25 pm #38469
shoestringmariner
Participant
quote fleetwin:

quote FrankR:

It’s real hard imagining water cooling the powerhead and not exiting that wide open hole. Why don’t you just put in a new core plug and see what happens before exploring further. BTW, I’ve seen lots of them with that plug rotted out.

I agree with Frank, don’t rip this thing apart further. Replace the core plugs, impeller, and seal components then run it again. My nickel says your problems will be solved.

That’s my plan. I’m sure the PO put in a new impeller, but I’m picking up a new one anyway just in case. Doesnt hurt to have one on hand
June 18, 2016 at 2:05 am #38496
shoestringmariner
Participant
2 new plugs installed from the local autoparts store. I think the cyl head plug blew out at WOT because the new one is leaking, so I think the shoulder of the bore is getting crappy. I cleaned it up the best I could but it’s still dripping, I put center punch marks all around the casting to try and swell the bore closed…we’ll see if that works

Anyway, the barrel test went well after getting it started (This motor is a Bitc* so get started, but once running, its a micro pull on the rope to fire it up again). I did not change the impeller because the head stayed cool last run…just as well, there is gobs of water coming out of the port. It is also much quieter now.

Hitting the lake in the AM. Will keep you posted

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June 18, 2016 at 8:20 pm #38528
shoestringmariner
Participant
SUCCESS!
almost 8 hours of use without a hitch. No overheating and was much quieter 🙂
Shell gas (no ethanol) with Amsoil may have a difference made in starting it. only 4 pulls cold from 20 something

Thanks for your help everyone, I would not have figured it out (The head plug, probably, the exhaust plug, never)
June 18, 2016 at 11:27 pm #38548
fleetwin
Participant
US Member
great, glad it is resolved
June 19, 2016 at 2:17 am #38566
ray-schaber
Participant
Check t o see if your choke is closing tight.
Ray
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