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43 OMC Corba Removal Sequence

S

seon

Member
"Newbie but not to boating or

"Newbie but not to boating or mechanical skills. On my new to me 20' Reinell hardtop cruiser I need to remove the 4.3 motor to replace the oil pan. I have the manual but it doesn't spell out which to remove 1st. I'm thinking that the vertical drive 1st and then the motor (?)

Also, I'm reading some are swapping out the Cobra outdrive...what's value added to swap the Cobra to another brand outdrive?

Being that plugging and glassing is involved, what about just swapping out to an outboard? Just some thoughts here."
 
"Forget the outboard idea, boa

"Forget the outboard idea, boat is not designed for that application.

Remove the drive first before you remove the motor.

The drive shaft won't allow the motor to move.

If you have no issue with the drive why change it.

But if you want to change out the drive a merc will fit in the same hole you will need everything back from the flywheel, coupler, inner transom plate etc. also you will need the shift converter maybe the cables, throttle maybe, you need the whole boat. Maybe the donor boat will have a hole in the hull who knows.

Easiest way and cheapest is to find a donor boat with a bad motor, and transfer everything over, make sure the motor in the donor boat was a 4.3, same year or close.

Nowadays there is another option sei makes a conversion kit can just convert the outdrive over, i never treid it but some have and say it works good."
 
"Chiefalen, thanks for your re

"Chiefalen, thanks for your reply.
Reason why I asked about swapping is that I plan to keep this "new to me" boat for a while so if there's a better outdrive, now is the time to swap.
wink.gif
"
 
"Good reading, again thanks.

"Good reading, again thanks.

BTW in the past, I've read where others have plugged the transom hole and mounted an OB. What are the pitfalls by doing that? Again, just looking at options."
 
The pitfalls are that your boa

The pitfalls are that your boat was designed to be an I/O with the engine mounted low and foward of the transom...outboards shift the center of gravity back and while it has been done...there's no guarantee that the boat will handle the same as it does now. Plus buying an outboard powerful enough to equal a 4.3 V-6 I/O means you have to at least get a 150 hp and that's not going to be cheap...to say nothing of the cost of reinforcing the transom and the finish 'glass work. If you want an OB sell that boat and buy a boat with an OB. I have an '88 Cobra with the same engine 4.3 4-bbl and its been very little trouble. If they are set up right and maintained properly they will last as long as any Merc or Volvo. I am not changing mine to another drive until I can't get parts for it. You can mount an Alpha drive (Merc) using a conversion kit sold by SEI. Also there is a kit to mount a Volvo SX on the Cobra transom. This has been around for many years because the Volvo SX was developed from the OMC Cobra castings (with Volvo internals) back when Volvo and OMC had a joint venture. But the Volvo drive is very pricey. SO I'm sticking with my Cobra.....
 
No rain today so I was able to

No rain today so I was able to pull the outdrive and motor out. Relatively easy except backing off the four s/s bolts that connects the exhaust "Y" to the out drive. Bolts were seized due to s/s to aluminum mating together. Got to bring transom plate to a machine shop and hopefully they can drill the broken piece out.
 
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