Taking off Risers and Rubber Exhaust Hose

[MSmith3615]

Can someone tell me if the cause of this is a cloged exhaust elbow. I took these pictures while the engine was running and I could see what look like water seeping out of where the elbow bolts to the manifold, which was replaced last year. The shop told me they repaced the elbows but they sure don't look like it and the manifolds look brand new. The thing is I ran the boat all day and the temp never got above 160, I'm supposed to go to the lake tommorrow but can'1 make up my mind whether its safe on my engine. Please advise.

 

[bigbrownbuku]

Re: Taking off Risers and Rubber Exhaust Hose

it could be leaking past the exhaust rubber. try tightening the hose clamps and perhaps it will stop.<br />if it is coming from between the riser and manifold, dont run your boat until you replace the riser gasket.

 

[MSmith3615]

Re: Taking off Risers and Rubber Exhaust Hose

it is coming from between the the riser and manifold.

 

[Haut Medoc]

Re: Taking off Risers and Rubber Exhaust Hose

Bad gasket/bad mating surface on the risers or elbows as you are referring to them, presumably....<br />Remove them & check for trueness with a straight edge....<br />If you didn't overheat, I would say that you have no blockage....<br />You're right, those elbows look older than a year, esp. since you are in fresh water....JK

 

[MSmith3615]

Re: Taking off Risers and Rubber Exhaust Hose

I don't know what trueenes are. Thanks for the help.

 

[sker crunch]

Re: Taking off Risers and Rubber Exhaust Hose

trueness.......flat surface, not warped.

 

[Reel Poor]

Re: Taking off Risers and Rubber Exhaust Hose

Originally posted by MaHolli:<br /> I don't know what trueenes are. Thanks for the help.

Trueness = Flat gasket surfaces....No corrosion around edges where water passes.<br /><br />In most cases if water is leaking out of the gasket, it is also leaking into the manifold where you cant see it. Thats BAD because it also ends up in the cylinders. BAD BAD BAD

 

[Haut Medoc]

Re: Taking off Risers and Rubber Exhaust Hose

No, I meant check the trueenes with a staight edge! Duh! I'm not spelling very well today <br />& what Reelpoor said is very true!....JK

 

[Scaaty]

Re: Taking off Risers and Rubber Exhaust Hose

I think your all off base. Look at the top of your manifolds. Thats that white crud that comes from Pipe Dope. Are there 2 plugs right in front of the riser? There are also 2 plugs right behind it too I bet. And right under and behind the riser...super hard to see in the photo but, thats a classic tiny amount of seepage out of the plug which will seal itself with rust and crud over time. And those are new manifolds, so thats the cause I bet.<br /> They are meant to be snug (plugs), so you don't crack the cast iron Manifold. There are pipe plugs to seal unused water hose points. And you say they replaced the elbows. Looks like you have elbows back there, only they are rubber, and they probably did replace them. Now, does it say Elbows, or Risers replaced on the bill? Risers were probably still in good shape, and the shop didn't gouge ya for new ones.

 

[MSmith3615]

Re: Taking off Risers and Rubber Exhaust Hose

Thank for all your help according to the bill which im reading here is what they did. Part#860246A10- 2 exhaust manifolds-396.60. part number#93504A3-2 exhaust elbows-277.80. part number#863724-2- gaskets-16.90. this was done on 6-27-05. I ran all day when I noticed my temp gauge got alittle over 160. It never got over 170-180, when I noticed it seemed to be getting alittle hotter than usual I decieded to check engine. Thats when I could see what looked like water seeping out where the risers bolt to the manifold while engine was running. But I boated the rest of the day and the temp stayed between 140-160,. So the risers are the original ones I think. how do i find out if thats the problem?

 

[Scaaty]

Re: Taking off Risers and Rubber Exhaust Hose

Get a new gasket for that riser then. Buy a few, need them down the line anyway. Pull the 4 bolts, bend it up, take a good look at the mating surface. Clean all the old gasket off (plug the holes with rags), put a new one in, and bolt her down good and tight. Go boating..and see what happens. But your sure its not the plug in the Manifold? Anyway, when running feel the risers. They should be both warm, not real hot, and probably will not feel the same temp, but thats normal. Just as long as one isn't super hot...then we have to go to plan B.

 

[MSmith3615]

Re: Taking off Risers and Rubber Exhaust Hose

well after closer inspection it looks like its leaking where the rubber things(elbows maybe) clamp on to the risers. here are some pics and again thanks alot.

 

[Scaaty]

Re: Taking off Risers and Rubber Exhaust Hose

Delete by author

 

[MSmith3615]

Re: Taking off Risers and Rubber Exhaust Hose

Well i just ran on muffs here is the exact spot that it is leaking. What do I do now?

 

[Scaaty]

Re: Taking off Risers and Rubber Exhaust Hose

Wow, you really get in there with a camera!<br />Anyway, ...so its not the plug, its not the riser. We need a Merc guy here, as you might have a Flapper problem. At least that looks like a Merc. I own Volvo, so I'm kinda in the dark here on your setup. Hang in there...more help will be here.. <br />But it shouldn't be leaking out there quite so much unless the is some sort of restriction. You should not have a elbow/hose problem in only one year. Maybe the riser has cracked on the bottom. Best bet is to pull that side Riser and Elbow, and have a good look-see.

 

[MSmith3615]

Re: Taking off Risers and Rubber Exhaust Hose

its a 1985 merc 260. do I just unbolt and have a look?

 

[MSmith3615]

Re: Taking off Risers and Rubber Exhaust Hose

Any Merc guys got any ideas? Thanks alot SCAATY. Hopefully some Merc guys will chime in here and help.

 

[rodbolt]

Re: Taking off Risers and Rubber Exhaust Hose

removethe rubber exhaust hose, inspect the riser outlet for rust, if the inspection says the riser is still fit for service clean off all corrosion and scale, clean the ID of the exhaust hose. wipe the surface with perfect seal and reinstall.<br /> it looks like the exhaust rubber is not sealing on the riser.<br /> and dont even bust my chops for spelling

 

[MSmith3615]

Re: Taking off Risers and Rubber Exhaust Hose

thanks rodbolt, what criteria do I use to determine if the riser is fit fot service? What is ID? What is perfect seal? Thanks again.

 

[bigbrownbuku]

Re: Taking off Risers and Rubber Exhaust Hose

Originally posted by BenC:<br /> it could be leaking past the exhaust rubber. try tightening the hose clamps and perhaps it will stop.<br />if it is coming from between the riser and manifold, dont run your boat until you replace the riser gasket.

the risers are a year old and likely there is no problem. its not unusual for the rubbers to leak slightly at all.<br /><br />if your clamps are tight this sometimes happens when a flapper gets stuck in the y pipe, increasing the pressure in the exhaust.<br />start with tightening the hose clamps. at your next service when your drive is removed for the shaft lube check for flapper pieces.