1966 18' IMP Oceanic V (with Buick 300 V8 OMC SternDrive) - Stuck Driveshaft

jahnaboi

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Joined
Aug 21, 2013
Messages
3
Hello all!

Its my first post and from the extensive research I've done online, this forum seems the most active with the most informative members.

I acquired a 1966 18' IMP Oceanic V with a Buick 300 V8 OMC SternDrive from a distant neighbor for free. I've worked on cars for years but this is my first official boat. After getting the boat I did tons of research regarding the integrity of the stringers and transom because a boat of this age and the quality of care they took care of it with (which was none) made me question the boat.

My girlfriend's family does wood work for a living so stringers and treating wood wouldn't be the issue. Since there is no interior, we will be making custom lacquered interior. The boat is definitely in rough if not worth to fix stage but I want to see if I can save it as the hull is in great shape as well as the transom. Hull has no repairs or holes, just a couple of scratches that are nothing to fret about.

Now I came onto this site because the traffic flow and experience of current members.

My current problem is as followed:

The motor, since it was not ever covered for years, took a lot of rain water for years on end and was rusted to oblivion. I soaked the rings before I took the heads off in PB blaster and Marvel Mystery Oil but after over a month of soaking them nothing has worked hence the complete tear down and wanting to remove the Buick 300 to rebuild it.

Motor is frozen and I already took everything off excluding the pistons and crank/oil pan.

I removed the bolts that hold the engine to the intermediate. But the flywheel will not break free from the drive-shaft spline I believe due to heavy rust. I know this should typically slide in and out but for the life of me and a 6 foot pry bar I didn't want to force the bell housing of the intermediate and engine block apart and potentially cracking the housing/tabs of the intermediate.

How should I go about removing the shaft from the flywheel? After downloading the aftermarket Manual for the OMC sterndrive, it seems if I remove the out-drive I could perhaps use a puller to possibly force the drive-shaft off of the flywheel section. Any input would help. Any suggestions about how to remove the splined section of the drive-shaft off would help a ton.

Sorry for the long post.

Here's pictures of it in all its glory. The neighbor supposedly was trying to repaint the boat and rebuild it but failed miserably due to medical issues. At least all the rails and horn are in the boat still.

00X0X_bjlwK1yw1cg_600x450-1_zps7f043313.jpg

00c0c_hDhTImyMarb_600x450-1_zps92a7371d.jpg

01414_feWk8K0VvNv_600x450_zps0b112613.jpg


-Jasper
 
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Howard Sterndrive

Rear Admiral
Joined
Nov 5, 2008
Messages
4,603
Re: 1966 18' IMP Oceanic V (with Buick 300 V8 OMC SternDrive) - Stuck Driveshaft

just heel bars under the ball gear might pull it out. Man that powertrain has a hundred obsolete key parts and it was a poor design from the get-go. Exhaust manifolds especially.
Even that round rubber transom boot (a 5 year maintenance item) hasn't been available for 15 years, and if an NOS one pops up on ebay the OMC/Evinrude boat guys will frantically bid it into a $500 neighbourhood.
If that drive is the original '66 that propshaft is probably the tapered one for which you can't even get propellers anymore.
If you love the boat, cut all that nonsense out of there and while you are working transom and stringers, fill the transom hole. Then you can re-cut it to accept a Mercruiser Alpha drive behind a Chevy 5.7L.
Then you will have a boat with 50 more HP, power trim, decent resale value, available parts (cheapest too), and mechanics that will work on it and know what they're doing.
 
Last edited:

HT32BSX115

Supreme Mariner
Joined
Dec 8, 2005
Messages
10,083
Re: 1966 18' IMP Oceanic V (with Buick 300 V8 OMC SternDrive) - Stuck Driveshaft

Man that powertrain has a hundred obsolete key parts and it was a poor design from the get-go. Exhaust manifolds especially.
Even that round rubber transom boot (a 5 year maintenance item) hasn't been available for 15 years, and if an NOS one pops up on ebay the OMC/Evinrude boat guys will frantically bid it into a $500 neighbourhood.
If that drive is the original '66 that propshaft is probably the tapered one for which you can't even get propellers anymore.
If you love the boat, cut all that nonsense out of there and while you are working transom and stringers, fill the transom hole. Then you can re-cut it to accept a Mercruiser Alpha drive behind a Chevy 5.7L.
Then you will have a boat with 50 more HP, power trim, decent resale value, available parts (cheapest too), and mechanics that will work on it and know what they're doing.


Howdy,


Welcome Aboard!

YES! That is a pretty cool looking boat that would REALLY be cool with a MUCH more modern engine and drive.

Since you're planning some "wood-work" anyway, Pull all the OMC "stuff", clean up the "good" stuff (scrap the bad stuff) and get familiar with EBAY and Craigslist! (I sold all my OMC 460 King Kobra "stuff" piece by piece over 3 years for approx $3500)

While you're doing this, Start looking for a late 90's-early 2000's Mercruiser Alpha Gen II powered by either a 4.3L V-6 or a 5.0/5.7L V-8

That will make for a REALLY nice boat!


Cheers,


Rick


How should I go about removing the shaft from the flywheel? After downloading the aftermarket Manual for the OMC sterndrive, it seems if I remove the out-drive I could perhaps use a puller to possibly force the drive-shaft off of the flywheel section. Any input would help. Any suggestions about how to remove the splined section of the drive-shaft off would help a ton.
Just cut it!
 
Last edited:

jahnaboi

Recruit
Joined
Aug 21, 2013
Messages
3
Re: 1966 18' IMP Oceanic V (with Buick 300 V8 OMC SternDrive) - Stuck Driveshaft

just heel bars under the ball gear might pull it out. Man that powertrain has a hundred obsolete key parts and it was a poor design from the get-go. Exhaust manifolds especially.
Even that round rubber transom boot (a 5 year maintenance item) hasn't been available for 15 years, and if an NOS one pops up on ebay the OMC/Evinrude boat guys will frantically bid it into a $500 neighbourhood.
If that drive is the original '66 that propshaft is probably the tapered one for which you can't even get propellers anymore.
If you love the boat, cut all that nonsense out of there and while you are working transom and stringers, fill the transom hole. Then you can re-cut it to accept a Mercruiser Alpha drive behind a Chevy 5.7L.
Then you will have a boat with 50 more HP, power trim, decent resale value, available parts (cheapest too), and mechanics that will work on it and know what they're doing.

The out-gears don't look to bad when I took off the cap for the oil dipstick and took a look. But if worse comes to worse, I will upgrade rather than sticking with the old.

Howdy,


Welcome Aboard!

YES! That is a pretty cool looking boat that would REALLY be cool with a MUCH more modern engine and drive.

Since you're planning some "wood-work" anyway, Pull all the OMC "stuff", clean up the "good" stuff (scrap the bad stuff) and get familiar with EBAY and Craigslist! (I sold all my OMC 460 King Kobra "stuff" piece by piece over 3 years for approx $3500)

While you're doing this, Start looking for a late 90's-early 2000's Mercruiser Alpha Gen II powered by either a 4.3L V-6 or a 5.0/5.7L V-8

That will make for a REALLY nice boat!


Cheers,


Rick


Just cut it!

Thanks for the welcome! Yea, looking at the vintage ad when the boat was first featured makes me want to revive it to a similar but modern state.

This is the ad that's motivating any work on it.
IMPb66003.jpg


Before I could get all the "bad" stuff out I gotta get the drive shaft off the coupler attached to the flywheel. Here's a picture to show what I'm having trouble with.

Problemwithboatshaft_zps83d30a05.jpg


Since the splined portion of the shaft is stuck to the coupler there is not enough room to cut between the bellhousing of the intermediate shaft and engine block. Wish it were easy to cut it out! But I have about 1/4" clearance max between the two with no visibility.

I just want to be out in the water already!
 

HT32BSX115

Supreme Mariner
Joined
Dec 8, 2005
Messages
10,083
Re: 1966 18' IMP Oceanic V (with Buick 300 V8 OMC SternDrive) - Stuck Driveshaft

Yeah. Maybe a thin long hacksaw blade?

That boat is fairly heavy. I would lean towards a 5.0 or 5.7L engine and associated drive....it would put you somewhere around 3000lbs....
 

Howard Sterndrive

Rear Admiral
Joined
Nov 5, 2008
Messages
4,603
Re: 1966 18' IMP Oceanic V (with Buick 300 V8 OMC SternDrive) - Stuck Driveshaft

take the drive off, take the boot off and maybe the intermediate will just come forward through the transom hole? It fits through the transom on the later rectangular hole stringer drives, but not sure about that round hole. I'm pretty sure boat builders received the engine with the intermediate attached and dropped it in that way, so it should come out that way.
I love this pic:
IMG_9799.jpg

I wish I could tag vegasphotoman...
 

Howard Sterndrive

Rear Admiral
Joined
Nov 5, 2008
Messages
4,603
Re: 1966 18' IMP Oceanic V (with Buick 300 V8 OMC SternDrive) - Stuck Driveshaft

there's a restoration page here at iboats if you want to look at what's involved to get the hull ready for a drive system that shouldn't be in a museum. There are a few threads with reworked transoms etc.
Get that stuff out and then evaluate everything.

That brochure looks cool, but most 1960's boat brochures are mad cool. You had to really be someone to own a ship like that in 1966.
 

southkogs

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Staff member
Joined
Jul 7, 2010
Messages
15,094
Re: 1966 18' IMP Oceanic V (with Buick 300 V8 OMC SternDrive) - Stuck Driveshaft

...That brochure looks cool, but most 1960's boat brochures are mad cool. You had to really be someone to own a ship like that in 1966.
Ya' ever notice how all the people who could afford 'em in the 60's dressed business casual to go boating :laugh:

Cool lookin' boat Jasper.
 

jahnaboi

Recruit
Joined
Aug 21, 2013
Messages
3
Re: 1966 18' IMP Oceanic V (with Buick 300 V8 OMC SternDrive) - Stuck Driveshaft

Yeah. Maybe a thin long hacksaw blade?

That boat is fairly heavy. I would lean towards a 5.0 or 5.7L engine and associated drive....it would put you somewhere around 3000lbs....

I do have a 18v dewalt sawzall that shreds the frame rails on cars right up. I'm pretty sure a hardened shaft will be a lot more difficult to cut through with that. I'll have to see. I'm thinking of making a puller that will pull the shaft from the intermediate with substantial force (excess of 8-10,000 lbs) should break it free from the coupler. Hopefully nothing goes wrong. :faint2:

The boat based on the brochure is definitely on the heavy side. The current Buick 300 + OMC Stern Drive (all aluminum I think) would probably weigh in the neighborhood of 750-950 lbs wet.

take the drive off, take the boot off and maybe the intermediate will just come forward through the transom hole? It fits through the transom on the later rectangular hole stringer drives, but not sure about that round hole. I'm pretty sure boat builders received the engine with the intermediate attached and dropped it in that way, so it should come out that way.
I love this pic:
IMG_9799.jpg

I wish I could tag vegasphotoman...

Haha. That's pretty awesome. I should take a picture of my cherry picker. I modified it so it stands around 8.5 feet tall (4 foot extension vertically with an A frame brace at the rear). Its completely bolt on modification so I could return the hoist to its original state for automotive applications.

I could pull the motor and intermediate as pictured above. But I'll still be stuck with the intermediate attached to the block by the driveshaft not wanting to come loose from the coupler on the flywheel. But at least its out? Which is more progress that whats its currently at. Thanks for the picture. If he did it and the manufactures did it as such, I'm pretty sure I can as well. :)

there's a restoration page here at iboats if you want to look at what's involved to get the hull ready for a drive system that shouldn't be in a museum. There are a few threads with reworked transoms etc.
Get that stuff out and then evaluate everything.

That brochure looks cool, but most 1960's boat brochures are mad cool. You had to really be someone to own a ship like that in 1966.

Will do. Getting the hull ready is definitely a labor intensive effort. But its something I'm willing to commit to.

It was a nice boat in 1966. Just sad its no where compared to what it was! Nothing buffer can't buff out right? :facepalm:
 
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