Question to owners about your 32' FB Sedan

Things that are of general interest.
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bcassedy
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Location: Aurora, In.
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Re: Question to owners about your 32' FB Sedan

Postby bcassedy » Wed Jan 30, 2019 8:13 am

I'm going to go out on a limb here.. ("walk the plank" may be a better term... ;) ) And ANYONE with technical knowledge, please chime in/correct me...

Re: running on one engine, other engine's tranny in neutral (prop then 'free spinning')
1. With the non-running engine (#2) out of gear, there's no resistance against the gearing within the tranny. And those parts that do move aren't
under an "engine running / tranny engaged scenario" so heat buildup, if any, is negligible.
--> Lubrication a concern????
2. The free spinning prop/shaft will still allow for the normal amount of water to lubricate the log housing/packing so there's no danger of shaft
damage there.
3. While a free spinning prop on #2 WILL incur a certain amount of drag, it will be much less than a locked in gear prop.
Think of a kid's pin wheel toy. If it's able to free spin in low wind, it'll put much less 'push back' than if the wheel was glued in position (lots of
push back, even in low wind.)
4. A non-running/locked in gear prop would put the tranny under a good amount of strain and I don't see that as advisable.
--> Thinking here of running in this condition, hitting a significant wake of a passing boat/barge that could rock your boat and the action/stress
of that rocking be transferred to the non-running prop.

Bill
Bill & Sharon Cassedy
"Sunset Seeker"
'88 32' Sedan Bridge
Located in Aurora, In.
Twin 318cu in Chrysler
1.5:1 Velvet drive trannies
Fresh water only

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shade2u2
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Location: Marietta, Ohio -mile marker 172

Re: Question to owners about your 32' FB Sedan

Postby shade2u2 » Wed Jan 30, 2019 9:10 am

Bill,
Thank you for "walking the plank" for us and clearly listing these options. Very well done. I definitely am not qualified to correct your well described options, but added one that I stated in post above.
bcassedy wrote:Re: running on one engine, other engine's tranny in neutral (prop then 'free spinning')
1. With the non-running engine (#2) out of gear, there's no resistance against the gearing within the tranny. And those parts that do move aren't
under an "engine running / tranny engaged scenario" so heat buildup, if any, is negligible.
--> Lubrication a concern???? = MAYBE...
2. The free spinning prop/shaft will still allow for the normal amount of water to lubricate the log housing/packing so there's no danger of shaft
damage there.
3. While a free spinning prop on #2 WILL incur a certain amount of drag, it will be much less than a locked in gear prop.
Think of a kid's pin wheel toy. If it's able to free spin in low wind, it'll put much less 'push back' than if the wheel was glued in position (lots of
push back, even in low wind.)
4. A non-running/locked in gear prop would put the tranny under a good amount of strain and I don't see that as advisable.
--> Thinking here of running in this condition, hitting a significant wake of a passing boat/barge that could rock your boat and the action/stress
of that rocking be transferred to the non-running prop.
Bill

5. (shade2u2) Some opinions are to secure the shaft with a clamp and blocking so that the transmission is not left in gear AND the prop does not exert pressure against the transmission. I've seen vice grips and custom blocking used to do this and I think there may be gizmos on the market for this also. It could eliminate free spinning and lock the prop without the strain on the transmission.

Additionally, I might be concerned about shaft seal lubrication on a dripless system like my Lasdrop shaft seals that I have. I will contact them to see what the company might recommends.

This is interesting discussion. I know a few people that run diesels on one engine regularly.
John
John
1986 39 Sedan w/Crusader 454 & 1.92 drive.
1984 28 Express Hardtopw/single 360 1.5:1 drive (SOLD)
Ohio and Muskingum Rivers (Marietta, OH)