Bravo 3: Gear oil leak into bilge and bellows-parts and process?

MarkSee

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2000 7.4 mpi and B3: engine s/n:0M022102 Transom s/n: 0M208877 Sterndrive s/n: unknown

Found gear oil in back of bilge even when not running:eek:; no leaks from hose, connector at transom assembly or bottle.

Pulled drive; gear oil in bellows:(. Saw no traces of water intrusion in bellows or when the gear oil was drained from drive.
Cleaned gear oil from bellows; bellows looks good and flexible. U-joints look good; gimbal bearing smooth and turns easy.

Pressure test drive; will not hold pressure and soapy water spray finds bubbles from a couple spots around perimeter of carrier assembly.

I have service manual 28/11 but thinking:confused: for doing this for the 1st time I'll pay someone and watch them do it.

If I were to try this myself or in preparing for what someone else will be doing and the parts needed:
Parts:
1-ring nut wrench
2-carrier assembly 86779a1
3-seal 807006 (part of carrier assembly?)
4-washer 41613
5-o-ring 861844

Procedure:
Is there parts of sm 28 starting at 3a-17 or a separate documented procedure for this type of seal replacement?

Anything else to be aware or watch out?

Does it matter that I do not know nor can I find the sterndrive s/n for getting the right parts?
The po had everything on the outside of the transom painted with a greenish protective paint so there are no stickers and the port side of the housing has any numbers not recognizable, the Merc label on the intake manifold covers only lists the transom s/n, the tag by the starter only lists the engine s/n.

Thanks for any feedback.

Mark
 

achris

More fish than mountain goat
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Re: Bravo 3: Gear oil leak into bilge and bellows-parts and process?

Hi Mark,

Looks to me like you have it all covered. I haven't done a bravo, so I can only give you what I've read in the manual and the way the parts diagrams look.... That said, it looks very much like a similar process as the Alphas.

The seal (26-807006) is part of the carrier (-86779A1).
I would also add the sealing ring to the list (-86780)
and the correct number of the 'O' ring is 25-861844.
I wouldn't both replacing the washer.

You may need to do some work/replace the yoke too, as they normally get a groove... I'd 'speedi-sleeve' it.

I also wouldn't bother pulling the shifter assembly out either, just remove the drive gear from the front and work just on the seal you need to do...

Do you have a small scale torque indicator (0-30 in.lb)?

The engine and transom numbers get us close enough.. :D

Cheers,

Chris......

EDIT: When you re-assemble, check and make sure the gear timing is correct. Page 3A-57 (manual #28)..
 

MarkSee

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Re: Bravo 3: Gear oil leak into bilge and bellows-parts and process?

Do you have a small scale torque indicator (0-30 in.lb)?

Thanks for the input Chris and correcting my part numbers.

Yes, I have an inch pound torque wrench.

Mark
 

MarkSee

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Re: Bravo 3: Gear oil leak into bilge and bellows-parts and process?

a)You may need to do some work/replace the yoke too, as they normally get a groove... I'd 'speedi-sleeve' it.
b)The engine and transom numbers get us close enough.. :D
c)EDIT: When you re-assemble, check and make sure the gear timing is correct. Page 3A-57 (manual #28)..

a)I'll take a close look at the yoke this afternoon. If it needs a "speedi-sleeve", got a favorite one?
b)that's a relief
c)yep; I'll be triple checking everything and reading over the sections of the manual several times

thanks for all the info and help

Mark
 

Bondo

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Re: Bravo 3: Gear oil leak into bilge and bellows-parts and process?

a)I'll take a close look at the yoke this afternoon. If it needs a "speedi-sleeve", got a favorite one?

Ayuh,.... The 1 that Fits....
 

MarkSee

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Re: Bravo 3: Gear oil leak into bilge and bellows-parts and process?

Ayuh,.... The 1 that Fits....

...was kinda lookin' for a brand that might be preferred for marine use instead of SKF but I'm good with them then.

Mark
 

Bondo

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Re: Bravo 3: Gear oil leak into bilge and bellows-parts and process?

...was kinda lookin' for a brand that might be preferred for marine use instead of SKF but I'm good with them then.

Mark

Ayuh,.... I donno if there's much of a brand Choice,...

All of My suppliers sell me the same stuff, at 'bout the same prices,...
It comes down to what's on the shelf, or how long I'm willin' to Wait for it to arrive.....

I can honestly say, I've never noticed the brand name of the 1s I get,...
Last batch were in basically green boxes... C/Rs maybe,..?? donno...
 

achris

More fish than mountain goat
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Re: Bravo 3: Gear oil leak into bilge and bellows-parts and process?

...was kinda lookin' for a brand that might be preferred for marine use instead of SKF but I'm good with them then.

Mark

SKF bought Chicago-Rawhide a few years back. They are the only makers of speedi-sleeves.
 

MarkSee

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Re: Bravo 3: Gear oil leak into bilge and bellows-parts and process?

Update: Retainer nut wrench arrived; got the u-joint assembly out and pinion to retainer nut removed from yoke.

Did detect a little like burnt oil smell in the assembly and see some darkness (see pics-sorry had to improvise) but I felt all around the yoke and it's totally smooth; no groove at all. Yoke splines all intact, no missing pieces; just a little dark in color.

While I did not separate the bearing pack for a full inspection, the larger outer bearing that I can see appears ok; figure I'll just give that pack a good bath in gear oil.

While waiting for the new parts to arrive, a couple questions I have:

1-anything else while this assembly is out I should be looking for regarding excessive wear? All gear components I've seen so far have no missing teeth or "red flag" signs to me.

2-for reassembly, the manual (28, page 3a-41) shows that for setting the preload on the bearing package, to use:
a -Torque Wrench (lb-in. ? Dial Indicator)
Does that mean I should not use my 'clicker' torque wrench but buy a dial instead? Or just go real slow as the instructions indicate and be sure not to over tighten? Maybe set it at the low end (6-10 is range) of 7 pounds?

thanks for any help as I work through this.

Mark
 

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achris

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Re: Bravo 3: Gear oil leak into bilge and bellows-parts and process?

Answers...
1. If there hasn't been any problems (apart from an oil leak) then there's nothing really to investigate. You've done all the obvious things, so I'd just button it all up and call it done...
2. I'd not use a clicker wrench... The torque indicator I'd use is the 0-30 in.lb. Seekonk (http://www.seekonk.com/torqstart.html and select 'torque gauges - Inch pound)

7 sounds good (as does anything between 6 and 10 :D).

Chris.......
 

MarkSee

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Re: Bravo 3: Gear oil leak into bilge and bellows-parts and process?

thanks for the info Chris.

No other problems than the oil leak.:)

I'll go ahead and add that torque gauge to my arsenal.:D

Mark
 

MarkSee

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Re: Bravo 3: Gear oil leak into bilge and bellows-parts and process?

Am I reading and understanding this right?

In reading through sm 28 again, I found that on page 3a-3 (see attached) they actually show a different spec for setting the bearing pre-load on whether it is 'new (8 lb-in)' or 'used(5 lb-in)' u-joint bearings; they seemed to have left that little difference out on page 3a-41 in the assembly step where it only mentions the spec of 6-10 lb-in.

Since I have not taken apart the bearing package and plan on re-using the current bearings, that to me means I use the "used" bearing spec of 5 lb-in?

thanks for the input as always

Mark
 

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achris

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Re: Bravo 3: Gear oil leak into bilge and bellows-parts and process?

Yep, used the 'used' spec.

As an aside. I'm back at work so I have limited access to the net.. It may take a while to see things you post up...

Chris...
 
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