Exhaust billows

[Acorn]

Is it necessary, when reattaching the lower exhaust billows to my 1993 alfa one outdrive that I would need to remove the outdrive, then attach it (the billows) first to the outdrive. Then reinstall the outdrive, then connect the billows to the exhaust at the stern? Theres got to be a easier way. Would a loose exhaust billow effect how the 3.0 motor idled?

 

[Haut Medoc]

Re: Exhaust billows

No & No.....
But it would make it easier.......
The exhaust bellows is not connected to the outdrive, it is connected to the gimbal housing & the bell housing.....
Removal of the of the outdrive will make it easier to reconnect.....
It will not affect engine performance at all.....

 

[wca_tim]

Re: Exhaust billows

go with the exhaust tube that onlyu attaches to the transom side... problem solved permanently

 

[Acorn]

Re: Exhaust billows

I guess that I'm not up on the proper names of the components associated with the entire outdrive, I need to go to school. I certainly haven't heard about the Onlyu product that you suggested. Thanks to both of you for answering my questions, Thanks for your time.

 

[krisnowicki]

Re: Exhaust billows

can't the tube be put on with out removing anything(except the old bellows)?

 

[Acorn]

Re: Exhaust billows

I'm not sure, doesn't appear to be a lot of room or clearance to work in when the outdrive is down, and when it's up, it's almost impossibile to extent the billows behond the gimball housing. It would probably be easier to attach it to the outdrive first, then lower it and attach it to the exhaust.

 

[krisnowicki]

Re: Exhaust billows

well if you dont get the tube you are supposed t use an expander tool and supposed to take the drive and bell housing off. I would get the tube this is a picture of it...
http://cgi.ebay.com/ebaymotors/Merc...50442QQihZ011QQitemZ320296300158QQrefidZstore

 

[180shabah]

Re: Exhaust billows

The tube is an easy solution but it does have a potential problem.

If you beach your boat, it is possible that a wave hitting your stern can push water through the exhaust and into the engine.

 

[Acorn]

Re: Exhaust billows

Thanks for the picture, I have jotted down the item number or the billows. Is this a orginal replacement part or is it another design. I ask this only because I'm not sure what one should look like and if the one that is currentlly on my boat is orginal or a replacement is something that I (at this point) can't be sure of. Well, there may be times when we will beach the boat. If you get sand with the billows installed properly, wouldn't you run a higher risk of sand getting into the engine without the outer (outdrive side) side connected? What can be done to stop the sand?

 

[180shabah]

Re: Exhaust billows

Sand entering through the exhaust is not going to be an issue unless the drive is up, the bellows have been removed and someone else is pushing your boat backwards through it.

 

[krisnowicki]

Re: Exhaust billows

Do you have to remove the drive or bellhousing to put the tube on... I know you do for the bellows but what about the tube

 

[180shabah]

Re: Exhaust billows

You don't "have to", but it sure makes it easier. You need to pull the drive to check alignment anyway, so just do you tube then.

 

[wca_tim]

Re: Exhaust billows

Smart alec....

no worries, I live there too. while I hear the arguement about somehow getting water up into the exhjaust with the tube on rather than bellows.. it could only happen

IF you were beached with ythe bow up and the stern down

AND had the outdrive in the up position

AND had the rear of the boat pointing pretty much directly into the waves

AND the waves were hitting the stern with enough force to force the water through the outdrive, through the port into the y pipe, up the sides of the y-pipe, past the flappers, all the way up to the risers and then down into the manifolds...

let's be realistic, how likely is this???

and yes, you CAN put an exhaust tube on without taking everything apart, but why would you? Chances are that the outdrive alignment needs to be chacked anyhow, as well as some other things....

imho

I guess that I'm not up on the proper names of the components associated with the entire outdrive, I need to go to school. I certainly haven't heard about the Onlyu product that you suggested. Thanks to both of you for answering my questions, Thanks for your time.

 

[Acorn]

Re: Exhaust billows

To beach a boat, I assume that the outdrive would have to be in the up or trailer position. Without it up you probably wouldn't get the bow to the beach.

And with the bow to the beach I have seen some boats take a sand bath or rough wake. I however never considered sand entering the engine or for that matter any part of the drivetrain.

Doesn't sound like it could happen, with or without the tube. I don't really understand marine applications of engine design, but I would assume they are something like automotive. What I mean is, in the automotive world you have or should have a balance between the intake of "air and fuel" from the carberator and the backpressure from the exhaust. If the exhaust gets restricted the engine runs ruff, and if the exhaust loses back pressure (excessively) it won't idle as designed. I didn't say it won't idle, but not smoothly as its suppose to. If I drop the tube or not connect the tube, how will this effect the idle and preformance of the drive train?

By the way thanks for the informative discussion!

 

[Haut Medoc]

Re: Exhaust billows

To beach a boat, I assume that the outdrive would have to be in the up or trailer position. Without it up you probably wouldn't get the bow to the beach.

And with the bow to the beach I have seen some boats take a sand bath or rough wake. I however never considered sand entering the engine or for that matter any part of the drivetrain.

Doesn't sound like it could happen, with or without the tube. I don't really understand marine applications of engine design, but I would assume they are something like automotive. What I mean is, in the automotive world you have or should have a balance between the intake of "air and fuel" from the carberator and the backpressure from the exhaust. If the exhaust gets restricted the engine runs ruff, and if the exhaust loses back pressure (excessively) it won't idle as designed. I didn't say it won't idle, but not smoothly as its suppose to. If I drop the tube or not connect the tube, how will this effect the idle and preformance of the drive train?

By the way thanks for the informative discussion!

It will have no effect.....
Usually, exhaust bellows take on an oval 'set' after they have been on awhile, can't you just stick it back on with some bellows adhesive?....
One other thing:
If you are going to do any preventative maintainence, you need to learn how to r&r the drive......

 

[180shabah]

Re: Exhaust billows

There will be no difference in performance at all.

On an alpha there are idle relief ports that allow the exhaust to escape at low speeds - otherwise the engine would have to "push" the exhaust three feet below the water to exit through the prop.

If you run it on muffs in the drive way you'll see what I'm talking about. Most of your exhaust(and cooling water) dumps out at the transom. Very little if any travels through the bellows and out through the prop.

As mentioned, now is as good a time as any to pull the drive. It weighs 86 pounds, so it can be done solo, but sometimes a second set of hands can help.

 

[Acorn]

Re: Exhaust billows

Thanks everyone for the advise and suggestions. I will get after that outdrive soon, and thanks for the advise on the exhaust at idle. I will look a little closer when I hook up to the muffs.