Bravo 3 Driveshaft Oil Seal

[Jesse Walter]

Need to change the driveshaft oil seal on my Bravo 3. I've had some drive oil in the bilge for last couple seasons and I thought it was a leaking reservoir. Removed the outdrive yesterday and the bellows was full of oil. My thoughts are the only place it can be coming from is a leaking seal or possibly the o-ring.

Got the spanner tool. Anything I need to look out for when taking out the driveshaft? I plan on just replacing the oil seal and the o-ring and reassemble.

 

[alldodge]

Should not be any issues so long as you have the Merc manual and tools. Will need a rolling torque wrench and couple other special tools. I made my own bushing/seal remove/install tool.

 

[Jesse Walter]

Alldodge, I have a regular torque wrench. Got the spanner today and removed the driveshaft and gears. Tomorrow I hope to tackle taking the gears apart to get to the seal. I should be able to press the new seal onto the ring. Do you know the torque spec on the nut? I don't have a manual.

 

[dubs283]

Do you know the torque spec on the nut? I don't have a manual.

The bearing pack/u joint assy is reassembled and the nut is torqued based on the rolling torque of the bearing assy. Used bearings are 3-7 lb/in, you need a rolling torque wrench for this

Also, the retainer is torqued using the removal/install tool with a torque wrench set to a spec based on the length of the torque wrench you are using

You should get a factory service manual if you are going to continue this procedure

 

[alldodge]

 

[Jesse Walter]

I believe I'm understanding. Torque the retainer nut until I get 6-10lb-in of rolling resistance. I'm reading that the retainer nut torque is 200ft-lb? But this could vary due to the rolling resistance?

 

[alldodge]

I believe I'm understanding. Torque the retainer nut until I get 6-10lb-in of rolling resistance.

Yes but not retainer nut the pinion gear nut

I'm reading that the retainer nut torque is 200ft-lb? But this could vary due to the rolling resistance?

Yes and No
Yes torque to 200 ft lb

No, the rolling resistance has nothing to do with the rolling torque of the

 

[Jesse Walter]

Great information. I didnt realize that was the name of the retainer nut. I was thinking thats seemed a lot of torque for a pinion nut. lol

I took it apart today and replaced the seal and large o-ring. I was very surprised how loose the pinion nut was. I'll have my rolling torque wrench tomorrow and get it all back together per the manual pages alldodge posted above.

Then on to installing it onto my "new" boat that currently has a Bravo 1. (See my older thread for that info).

 

[alldodge]

Vid by Achris on preload

 

[Jesse Walter]

Vid by Achris on preload

Yes, I watched that yesterday and plan on following those steps.

 

[tpenfield]

Get the rolling torque wrench, else you will have trouble getting the torque correct. If you over torque it, you will have to dis-assemble & re-assemble.

Also, a trick for getting the retainer nut torque correct is to mark a line for the housing to the nut before you loosen it. Then on the reassembly bring the 'line' you marked back into alignment.

https://www.seekonk.com/cat-43-1-54/inch-pound-dial-torque-wrench.htm

 

[tpenfield]

Here are the guts, in case you have not taken the top end apart before . . .

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If you are having any problems with delayed shifting, now would be a good time to lightly de-glaze the clutch gear cups.