Ski boom repair |
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chau8238
Groupie Joined: August-08-2017 Location: Houston Status: Offline Points: 75 |
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Posted: February-14-2018 at 11:10am |
Hi guys, the ski boom in my 73 Mustang is loose, the wood that supports it rotted out and right now has angle brackets supporting it to the stringers. I can replace the wood, but I was wondering if anyone has used the aluminum setup on the later boats, I like how it runs the lengths of the stringers and would be a lot sturdier.
Similar to this. http://www.mindspring.com/~bwmitchell/Boat%20Pics/Nautique/Aug%2015%202.jpg |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Phillip,
I suspect the rotted wood around the pylon is just the "tip of the iceberg". Have you checked wood condition elsewhere? Have you checked you alignment? |
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chau8238
Groupie Joined: August-08-2017 Location: Houston Status: Offline Points: 75 |
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Oh I'm sure it could probably use new stringers. But the couple places I drilled into the stringers seems pretty solid still. The alignment I haven't checked, but I need to replace the shaft anyways since it isn't press fit in when I bought the boat. It was modified and has two bolts locking it in place. I'm looking into the dual taper, I just wish they weren't so much.
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21113 |
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Modifying the floor and stringer design to accommodate an engine cradle is certainly possible, but not a minor undertaking. Most people do not bother to make these changes unless undergoing full stringer and floor replacement.
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Duane in Indy
Platinum Member Joined: October-26-2015 Location: Indiana Status: Offline Points: 1578 |
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Underline the part that says"not a minor undertaking" I made my pylon mount and engine cradle separately. Certainly a major task. pylon mount engine cradle |
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Keep it as original as YOU want it
1978 Mustang (modified) |
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Hollywood
Moderator Group Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13510 |
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I've seen a few other brand pylon brackets for sale on eBay. You don't necessarily need material in front and behind.
No matter what opening up the floor and fabricating a bracket, installing and closing up the floor is still going to take some work... |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Phillip, The two bolts you mention holding the coupling to the shaft, are they set screws like this: If so, more than likely the set screws are original. Before the common practice of installing safety collars on the prop shaft, the set screws were used as a safety means. If due to misalignment the shaft and coupling became loose from fretting, the set screws where there to keep the shaft from exiting out the back of the boat. I suspect your boat has or has had some bad alignment fretting the fit at the coupling and shaft. |
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chau8238
Groupie Joined: August-08-2017 Location: Houston Status: Offline Points: 75 |
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I'm kind of wanting something that bolts in front of the motor so that it pretty much doesn't interfere with anything else and easy to install.
As for my shaft coupling, it has been modified some since there are nuts welded to it. The shaft can slip in/out easily if the set screws aren't tight. So a new shaft is needed and then I planned to adjust the alignment if it's out. It has 3 bolts total, one is where the keyway is. The other two on the shaft directly. https://i.imgur.com/I2NZgO0.jpg |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Modified? Not necessarily true. It was common to drill dimples into the shaft for the set screws to seat into. One method of dimpling was to press the shaft onto the coupling half, drill through the coupling wall slightly into the shaft and then the nuts were welded on. This way, drilling didn't disturb any pre existing threads tapped into the wall of the coupling. |
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Duane in Indy
Platinum Member Joined: October-26-2015 Location: Indiana Status: Offline Points: 1578 |
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The same guy probably used nails for cotter pins too. Surely you don't endorse that method Pete.
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Keep it as original as YOU want it
1978 Mustang (modified) |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Certainly not to retain the coupling but as a safety, the set screws were used for years and years. My 1915 launch prop shaft had set screws running into dimples on the shaft. Duane, lots has been done through the years without the advantage of having a tool maker on board!! |
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Duane in Indy
Platinum Member Joined: October-26-2015 Location: Indiana Status: Offline Points: 1578 |
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Retired Tool Maker Pete
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Keep it as original as YOU want it
1978 Mustang (modified) |
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Hollywood
Moderator Group Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13510 |
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What welded on nuts?
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chau8238
Groupie Joined: August-08-2017 Location: Houston Status: Offline Points: 75 |
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If my boat wasn't full of stuff right now, I'd get some better pics. It definitely has some hack job fixes on it. I've slowly been sorting it out and fixing things as I can, but I'm not made of money.
He used a cotter pin..... https://i.imgur.com/iUwk8q5.jpg |
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Duane in Indy
Platinum Member Joined: October-26-2015 Location: Indiana Status: Offline Points: 1578 |
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You are lucky that that cotter pin did not fly out. Helpful constructive criticism: Replace that cotter pin and install a new one it correctly. |
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Keep it as original as YOU want it
1978 Mustang (modified) |
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Duane in Indy
Platinum Member Joined: October-26-2015 Location: Indiana Status: Offline Points: 1578 |
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This is good reading for just about any fix.
AC 43.13-1B - Acceptable Methods, Techniques, and Practices - Aircraft Inspection and Repair [Large AC. This includes Change 1.] Just Google "Ac 43.13" Chapter 7 page 26 This book is the Bible for aircraft repair techniques Duane link |
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Keep it as original as YOU want it
1978 Mustang (modified) |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Phillip,
I know you're not flying or repairing aircraft so here's a picture of the proper cotter pin install in a castle nut. Long leg over the end of the shaft. Short leg clipped to fit laying flat on nut flat. |
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Sounds like Quinner whispering sweet nothings to his date. |
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chau8238
Groupie Joined: August-08-2017 Location: Houston Status: Offline Points: 75 |
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I know how to install a cotter pin, that's an old pic and it has since been changed. I'm just saying, he didn't use a nail.
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