Packing box "wobbling" at low RPMs

Corrosion, Paint, Through Hulls, etc.
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Maestro
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Packing box "wobbling" at low RPMs

Post by Maestro »

From 600-1500 rpm the packing box is vibrating/wobbling around - lock nut remains tight though.

When I reach 2000+ rpm the packing box remains completely still.

It's leaking a little more than it should but nothing crazy.

Any ideas? I just want to make sure it's not going to work itself loose and start a big ol' leak.
Maestro
1986 32' Sedan
Chrysler 360s
1.5:1 Gears, 16x16 props

1970 28' Express
Single Chrysler 440
1:1 Gear, 14x12 prop

Green Bay, WI
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bill
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Re: Packing box "wobbling" at low RPMs

Post by bill »

Sounds like a bent shaft and or propeller. :|
Did you hit sometthing :?:
bill
Former owner of
ALUMINATION
Grosse Ile MI
Located on LakeErie
37' F/B Sedan
1975
Twin 360 Chrysler Marine
Raw water cooled
Hydraulic steering both helms
USCG Master Lic. Retired[/color]
Third Owner bill
barkleydave
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Re: Packing box "wobbling" .at low RPMs

Post by barkleydave »

You need to get this corrected very soon or severe transmission damage could result.

I would start by separating the coupling and see where the shaft rests. If it falls out of alignment then you need to investigate further.

Bill covered some of the possibilities.

1. Bent shaft?
2. Prop out of true
3.Worn Cutless Bearing (prop, engine, shaft problems etc; can cause this)
4 .Transmission bearing wear causing wobble
5. Engine/coupler alignment do to an engine shift. (not too likely but possible.
6. Bent strut. (ours are really tough when they get hit usually brakes or goes wildly wrong immediately!)

Or all of the above ! KEEP US POSTED.

safe boating,
dave
1987 Marinette 29 FB Sedan
Retired Boat Accident UL and USCG trained investigator
Retired USCG Captain
Roger2
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Re: Packing box "wobbling" at low RPMs

Post by Roger2 »

I would think that your shaft is bent. At 2000 RPM it's just too fast of movement to see, Put your finger on it, you will feel it is still moving.
All are correct, fix soon & let us know.

Roger
"Sea Jay" a 37' Double cabin with twin factory Volvo diesels, 230 HP each. Twin Disk 1.54 Trans turning DynaQuad 19X21 props.
Roger Brown
Petersburg, IL
jtalberts
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Re: Packing box "wobbling" at low RPMs

Post by jtalberts »

I have the same issue on my port shaft. Mine is on a remote mounted V-drive. I am going to get it worked out when I pull the boat for winter. I believe one of the POs hit something as both rudders are pretty bent and I believe my prop shaft is bent as well. Luckily the boat came with a spare prop shaft.
1973 Marinette Seacrest Executive
41x14
Twin Chrysler 340's with Velvet Drive 71C
"Figment"
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Maestro
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Re: Packing box "wobbling" at low RPMs

Post by Maestro »

Other info to consider:

My cutless bearing is new for this season.

I am also running a brand new propeller shaft this season.

I have a Globe Drivesaver installed. Packing box wobbled before and after drivesaver was installed.

I did hit something last week but again, the wobble was there BEFORE this incident as well as after. We were in shallow water at idle speed about 500rpm. (I immediately threw it into neutral and we paddled out of the area) After hitting this mystery object we ran the boat at several different speeds and no additional vibration seemed to be present.
Last edited by Maestro on Fri Aug 15, 2014 5:03 pm, edited 1 time in total.
Maestro
1986 32' Sedan
Chrysler 360s
1.5:1 Gears, 16x16 props

1970 28' Express
Single Chrysler 440
1:1 Gear, 14x12 prop

Green Bay, WI
Fastjeff
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Re: Packing box "wobbling" at low RPMs

Post by Fastjeff »

That's why I don't like those Drivesavers. They have no way to control side forces on the coupling.

Jeff
"We live at the bottom of an ocean of air, not at the top." General Marvage Slatington
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Maestro
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Re: Packing box "wobbling" at low RPMs

Post by Maestro »

UPDATE:

Pulled the boat and saw right away that the prop was slightly bent due to hitting a stump at low speed.

Had the shop check the shaft for runout and the they found it to be perfect.

They also adjusted the placement of the shaft anode and checked the torque on all the drive saver bolts.

So, I have to send the prop off to get fixed up and we'll see what that does.
Maestro
1986 32' Sedan
Chrysler 360s
1.5:1 Gears, 16x16 props

1970 28' Express
Single Chrysler 440
1:1 Gear, 14x12 prop

Green Bay, WI
jtalberts
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Re: Packing box "wobbling" at low RPMs

Post by jtalberts »

What was your result?
1973 Marinette Seacrest Executive
41x14
Twin Chrysler 340's with Velvet Drive 71C
"Figment"
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Maestro
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Re: Packing box "wobbling" at low RPMs

Post by Maestro »

Getting the prop fixed up helped this issue, but a slight wobble at the packing box is still present.

I had two different mechanics watch the packing box while in gear - neither seemed to think it was that big of a deal.

May be taking it to someone for a third opinion this season...will update.
Maestro
1986 32' Sedan
Chrysler 360s
1.5:1 Gears, 16x16 props

1970 28' Express
Single Chrysler 440
1:1 Gear, 14x12 prop

Green Bay, WI
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