Leak from outdrive Exhaust tube.

[lmannyr]

Re: Leak from outdrive Exhaust tube.

I'll gather the parts this week to do the pressure/vacuum test this weekend. I'll keep you all posted.

thanks for the tips.

 

[lmannyr]

Re: Leak from outdrive Exhaust tube.

ok...Out to get the parts today. Had a question though, I have the PLASTIC fitting for the drive I use to fill drive with oil. Will the plastic fitting be ok or do I need the metal fitting?


thanks!

 

[Bondo]

Re: Leak from outdrive Exhaust tube.

I have the PLASTIC fitting for the drive I use to fill drive with oil. Will the plastic fitting be ok or do I need the metal fitting?

Ayuh,...

If you're filling the drive,..
It don't much Matter, as long as the drive gets Filled...

If you're going to use the fitting for building a Pressure Tester,...
I'd go with the Metal Fitting,... With it's o-ring, it's a much more Sure thing to seal...

 

[lmannyr]

Re: Leak from outdrive Exhaust tube.

Ok...here are the results....

oil out, drive still on, no resovoir.

11psi pressure held for at least 20 minutes.

Can't get a vacume more than 2 and even then, it looses that.

Oil is worse now than it was when I first started this thread. I'll post pics of oil later (i'm on the slow comp, admiral on the light speed comp). Oil is milky, and no longer clear.

What should I do...thanks!!

 

[Bondo]

Re: Leak from outdrive Exhaust tube.

What should I do...thanks!!

Ayuh,....

It sounds like it's time for a Rebuild/ Reseal of the Drive....

 

[lmannyr]

Re: Leak from outdrive Exhaust tube.

Which seals can I do without all the special tools? Can't spend the $$$ for a rebuild just yet.

I will split the drive this morning and see which section has the leak.

Thanks..

 

[lmannyr]

Re: Leak from outdrive Exhaust tube.

Ok... lower unit off and it holds vacuum and pressure.

This leaves the vacuum leak on the upper unit (still on boat). Where are the seals to check for leaks on the upper? Thanks!!!

 

[Bondo]

Re: Leak from outdrive Exhaust tube.

Ayuh,... All of them...

 

[lmannyr]

Re: Leak from outdrive Exhaust tube.

Thanks for the quick response Bond-o.

But my question is are the seals in question checkable without taking the upper half apart?

Can I leak check the upper half only after sealing the oil passage hole on the side?

thanks..

 

[lmannyr]

Re: Leak from outdrive Exhaust tube.

Upper half is off the boat now. Bellows is without water. U-Joint is without any signs of rust and with plenty of grease like I left it back in NOV of 08.

To summarize:

Lower unit holds pressure and vacuum.

Upper unit holds pressure but NOT vacuum more than 2.

Any further tips greatly appreciated.

 

[lmannyr]

Re: Leak from outdrive Exhaust tube.

OK I think I found the problem but need confirmation by the experts.

In this picture you'll find a seal of some sort with the inner spring out partially. Is this the Drive Shaft Housing Bushing or the Lower drive shaft Housing Oil Seal?

With the milky oil around it, this make me believe this is it.

And a picture of the oil drained as promised.

 

[lmannyr]

Re: Leak from outdrive Exhaust tube.

I'd like to replace this bushing myself. Can I pry this bushing out then evenly press the new one in with a piece of wood and hammer?

thanks

 

[lmannyr]

Re: Leak from outdrive Exhaust tube.

After reviewing the Mercruiser manual #6, Drive Shaft Housing Disassembly Chapter, I decided to pry the bushing/seal (whatever) out. Out it came very easily with a flat head screwdriver.

There was nothing but a bushing/seal housing and the spring that comes with it - there was no rubber left.

How could it even hold pressure like it did? Anyhow, can someone identify the part so I can order it? Thanks!!

 

[lmannyr]

Re: Leak from outdrive Exhaust tube.

The bushing removed came from the center hole here..

 

[Bondo]

Re: Leak from outdrive Exhaust tube.

can someone identify the part so I can order it?

Ayuh,... It's the Little Seal in the upper reseal kit....

If you want a part # for just that 1,...
Go to Merc.'s parts look up pages...

 

[lmannyr]

Re: Leak from outdrive Exhaust tube.

Got the upper reseal kit and replaced the small seal from above pictures. In order to replace the rest of the seals I need the spanner nut wrench, I'm waiting on the wrench to arrive to finish the job.

Since the drive is down, I'm also replacing the trim limit/position units. I'm thinking on replacing the shift cable but don't wanna get anymore tools for now. I'll probably leave the cable for another day.

Bellows still new except some rub marks on both port and starboard side. Couldn't figure out what was rubbing.

Until the tool arrives, the upper and lower units are in garbage bags to prevent moisture and dust contamination.