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Exhaust pipes

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stracy

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Removed 280 outdrives to replacie bellows and intake hoses The exhaust pipe hoses are in tuff shape one is splt in half. I do not what they do or are they needed $50 each for replcements looks like the old intake hoses could be modified to work
 
Stracy, I'm unclear here.
Are you talking about the rubber exhaust couplers that join the exhaust elbows to the Y-pipe?


If so, this is 95mm soft wall Marine exhaust hose.
The OEM replacements are always too short... repeat.... always too short....., of which places one of the two band clamps over the top of the elbow scallopped areas.
This will eventually restrict spent sea water flow as the coupler burries itself into the scallops.

I'd encourage you to locate this 95mm hose, and purchase it by the foot.
This 95mm hose is not easy to find.
If/when you do find it, make sure that your sections are at least 2" longer than what the OEM's were.

The added length will allow you push the hose up further onto the elbow, and away from the scallops.

Or..... use the shorter OEM ($$$$) rubber couplers, and use a single SS T-bolt clamp at each end.

The SS T-bolt clamps should satisfy the USCG regs.





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Those are sometimes called "rubber hook" hoses. I think you have to pull the engine and Y pipe to change them properly. They keep water from washing up the exhaust when you come off plane.

I seem to recall seeing quite a few boats where they had rotted off and weren't replaced- not sure how big an issue it is
 
Stracy, my appologies to you........ I made a mistake.

I looked at the schematic via my iPhone, and apparently did not look closely enough.
SEQ # 29 is the rubber hook.
These are exhaust relief elbows for low RPM use.
The Y-pipe must be removed to install these.

If you have an AQ200B or AQ225B w/ the 280 drive, you'll have only one rubber hook.
If you a later V-8 engine model w/ the 280 drive, you'll have two rubber hooks.


Use extreme caution when breaking the Y-pipe loose from the transom shield.... it's likely corroded some, and it's very easy to crack or break the exhaust bellows snout off.


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My AQ250 is 40 years old. Those idle relief rubber thingies were deteriorated. One was missing altogether, the other had been 'glued' in. I took out the one that was useless and cleaned up both ports. I didn't like the idea of the ports being susceptible to back-flooding the engine when in reverse, so I put in PVC pipe w/ a 90° angle. It fit pretty snug in what rubber was left. So far so good after about 100 hours.


IMAG1949
 
Just a friendly FYI here.

The rubber hooks have a flange at the inboard side. This flange becomes a sealing means between the transom shield and the Y-pipe.
There is a plastic ring/washer looking affair (it slides onto the hook and up against the flange) that is no longer available.
The plastic ring/washer is to create more squeeze on this flange.

You may be able to find something suitable at a good hardware or plumbing store.

These rubber hooks (as well as the five Y-pipe O-rings) are below the water line, and if they were to leak, we can end up sinking a boat if left unattended for any length of time.



 
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I like the PVC pipe retrofit. I think I might clean up the holes from the outside, and bed the pvc into some 3M 5200
If the engine ever comes out in the future, then I'd do the proper fix up which might involve mufflers and thru hulls if things were corroded in that area.
 
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