Replacing vertical drive shaft. As long as it's got a preload pin Im good?

[soggy_feet]

Hit a rock the other day, screwed up the prop, and also lost the ability to spin it.

Started my teardown, looks like I'll be needing a new vertical shaft. The one in the drive has the preload pin.

The shape of the cavitation plate looks like a Gen1 Alpha 1, but the top cap and bosses where the upper bolts to the bell housing look like an MC1.

All the serial numbers are gone off both the upper and lower pieces, so I'm down to matching by looks.

Were there different part numbers with the preload pin, or as long as it has a pin, should I be ok to buy it?

 

[Bondo]

Re: Replacing vertical drive shaft. As long as it's got a preload pin Im good?

Ayuh,... Post some pictures,... It's probably an "R" drive, or "MR" drive,...

Yes, there were changes,...

 

[soggy_feet]

Re: Replacing vertical drive shaft. As long as it's got a preload pin Im good?

Here's a couple shots of the cleaned up bearing carrier as I was working on repairing it. The new ring was turned down and thinned a bit to match what was left of the old ring. I don't have a photo of it finished.
Don't know if shots of the carrier will help ID the lower or not.



Here's an external of the entire drive. It was originally black, and there were no decals on it. I took it in the blast booth and glass blasted the entire thing hoping to uncover an obscured serial number,also, the original finish on it was in poor condition and there was a lot of corrosion bubbling under the paint. A few coats of etching primer and enamel paint apparently weren't enough to seal it. That's another story though.




Let me know what other photos would help, I'll try to get them uploaded tonight.

 

[soggy_feet]

Re: Replacing vertical drive shaft. As long as it's got a preload pin Im good?

I just read that there are 8 spline and 13 spline shafts (referring to the pin end).


Otherwise, in the last 2 hours of looking around the internet, I don't really see any other difference between preload shafts.

I really need to get parts on order ASAP. If I match spline count, am I going to get the correct part?

 

[Bt Doctur]

Re: Replacing vertical drive shaft. As long as it's got a preload pin Im good?

That should take the 13 spline one.Think its an R if it had a pin and a MR if it didnt.You cant fix the carrier like that.There is no place for the prop shaft seals. Should you desire a good used one pm me

 

[soggy_feet]

Re: Replacing vertical drive shaft. As long as it's got a preload pin Im good?

I can fix the carrier like that. I had to weld, then grind, then weld to get the contaminants out of the cracks, but once I got it welded up, I trued it up and bored the prop shaft seal surface, and any imperfections were filled with JB Weld.

If you've got a replacement carrier (thats correct), can you tell me the part number off it? I tried 2 different carriers before resorting to repair of the original, the one that was the correct diameter was 7/8" too long, the one that wasn't too long was a smaller diameter.


BTW, I have an 8 spline shaft. Does that mean anything? Get me closer to a year of manufacture?

 

[Bt Doctur]

Re: Replacing vertical drive shaft. As long as it's got a preload pin Im good?

8 spline is very early 70` ish but the lower looks like the R,MR,Alpha type and shoould take the 13 spline. how many spline was the one you removed? What was the number on the carrier?

 

[soggy_feet]

Re: Replacing vertical drive shaft. As long as it's got a preload pin Im good?

The driveshaft is 8 splines. It's the only one I've got, not removed yet because I haven't had a chance to make the pinion nut tool.

The carrier part number is 56211

73020A14 is the right diameter, but the seals and bearing are pushed out that extra 7/8" so they don't touch the shaft.

52835A2 has the seals and bearing in roughly the correct location, but it fits into a smaller housing and supports a smaller diameter shaft.

BTW, if anybody needs either of those carriers, they're on my work bench and useless to me... open to offers.

 

[Bt Doctur]

Re: Replacing vertical drive shaft. As long as it's got a preload pin Im good?

post some pice of the lower unit, some from the water pump base area. 73020A14 is correct for the #1-R housing but I think its 13 spline.

 

[soggy_feet]

Re: Replacing vertical drive shaft. As long as it's got a preload pin Im good?

Pulled the water pump, shaft came with it. Don't know why I didn't expect that sooner.
Not sure how I'm going to hold the pinion nut and/or gear and spin one or the other. Not quite enough room to get the sheared off splines and nut out of the gear.

I know what you're getting at with the water pump area pics. I'll post them up, but it's not threaded below the pump.

So, I have all the interior characteristics of a MC-1 drive, and all the external characteristics of an Alpha drive.


I'm at a loss...


Pics within an hour. I want to take a few more, and then I need to transfer them them off my phone.

 

[Bt Doctur]

Re: Replacing vertical drive shaft. As long as it's got a preload pin Im good?

pm`d a pic

 

[Bt Doctur]

Re: Replacing vertical drive shaft. As long as it's got a preload pin Im good?

heres another

 

[soggy_feet]

Re: Replacing vertical drive shaft. As long as it's got a preload pin Im good?

Photo Blast!


Here's my reverse gear in the bearing carrier.


Here are the two carriers I've tried that didn't fit, and my original repaired one in the center/back.


Side view. The two newer ones are on the board to make up the difference of the reverse gear. These essentially are the heights of all three on a flat surface.



This is the headache I'm looking at. Pinion gear with sheared off section of shaft left in it.



Here's the end of the shaft.

 

[soggy_feet]

Re: Replacing vertical drive shaft. As long as it's got a preload pin Im good?


The drive shaft is an 8 spline.



Shot of the sheared off spline in the pinion gear.


No threads below the water pump. There are 2 recesses visible 180? apart below the outer bearing race, I assume to assist in fitting a tool to pull that outer race.

Externally, this lower looks like an Alpha. Internally, looks like an MC-1/R/Pre-Alpha, or whatever you prefer to refer to it as.

 

[soggy_feet]

Re: Replacing vertical drive shaft. As long as it's got a preload pin Im good?

Alright, I see what you mean about the spring.

I've got small hands, and an o-ring pick. It may not be that tough to get that pin out of the shift dog.

 

[Bt Doctur]

Re: Replacing vertical drive shaft. As long as it's got a preload pin Im good?

last pic shows the wrong gasket there below the pump base. teeth to the left is old style that needs a preload pin.
try removing the spring and pin to remove the rest.

 

[soggy_feet]

Re: Replacing vertical drive shaft. As long as it's got a preload pin Im good?

BAM.

10 minutes. That wasn't nearly as hard as I thought.

Pics and short description of what I did to come shortly.

I'll say this, helps to have small hands but long fingers.

 

[soggy_feet]

Re: Replacing vertical drive shaft. As long as it's got a preload pin Im good?

Oh, the water pump gasket... It matches the water pump base. I could change the gasket but I'm still not going to get any more water thru there...


Drive is completely disassembled. Looking online quick and I see

45-455757-A1

and a reference that "4555757A1 supercedes to 4541939A1"

Here's 4541939A1 Which is also Sierra 18-2167 (for 165 (6 cyls) S/N 2763442 & above)


I've actually got a 165hp straight 6. Not sure if I have a serial number plate anywhere. I should go take another look around the boat.. and like we've covered, nothing on the drive makes sense or matches up..


So, back to the original question, these are all the same, right? As long as it's 8 spline with a preload pin, I should be set?

 

[Bt Doctur]

Re: Replacing vertical drive shaft. As long as it's got a preload pin Im good?

trust me ,its the wrong one. you need 27-85610-1. that base gasket is for MR/Alpha applications.its not about flow, its about sealing the base.

 

[soggy_feet]

Re: Replacing vertical drive shaft. As long as it's got a preload pin Im good?

So, the base is good, just use a different gasket?

Kit came with multiple, I probably have that other one sitting on my toolbox.