Y Pipe Corroded!

[djmakko1]

Hi folks: I have a 86 Chris-Craft 5.7 alpha 1
Y pipe was bursting water dismount the motor and find the Y pipe corroded , any ideas why this happened? do I have any other problems. Thanks for your help.

 

[nola mike]

How did your exhaust shutters look? The old one piece design would fall off and lodge down there, eventually eating a hole.

 

[djmakko1]

Shutters still in place , no damage.

 

[Scott Danforth]

do you boat in salt water?

since the part was designed to last 15 years and its going on 35 years, not bad actually.

 

[Bt Doctur]

excessive water in the bilge . I install a small 500gph at the very stern and turn it on as I power up.

 

[djmakko1]

do you boat in salt water?

since the part was designed to last 15 years and its going on 35 years, not bad actually.

Actually I replace it in 2013. and yes I'm in salt water.

 

[GA_Boater]

excessive water in the bilge . I install a small 500gph at the very stern and turn it on as I power up.

Had the same thought, BT. It looks like the corrosion is external judging by the stuff around the hole.

 

[djmakko1]

excessive water in the bilge . I install a small 500gph at the very stern and turn it on as I power up.

Ive accidentally put in in the water without the plug about 2 years ago that is the only time the bilge had water , you think that could've cause it? is in salt water btw.

 

[Lou C]

That I doubt but you never know how good the grade of aluminum was that they used. My '88 Cobra has sat with salt water in the Y pipe all season on the mooring approx. 15 years! Might have been a casting flaw/air bubble, weak spot that just corroded through as the rest of it does not look bad. Not sure if this helped but I always filled the exhaust with AF with corrosion inhibitors each winterization yes a lot of it runs out after the manis are full but maybe enough remains at the bottom to help.

 

[nola mike]

Had the same thought, BT. It looks like the corrosion is external judging by the stuff around the hole.

I was thinking a small hole leaking for a while could look like that as well.

 

[tank1949]

Hi folks: I have a 86 Chris-Craft 5.7 alpha 1
Y pipe was bursting water dismount the motor and find the Y pipe corroded , any ideas why this happened? do I have any other problems. Thanks for your help.

Mine "cancered" out just like yours due to rotten transom which allowed salt water to continuously coat y pipe and inner transom assembly. Former owner may have never flushed/rinsed with fresh h20 either. If 1986, I'd check for rot. If rot, the work really begins. I am putting my 86 SR together and thank God I labeled all wires. Good luck! Start searching ebay for freshwater used y pipe.

 

[djmakko1]

That I doubt but you never know how good the grade of aluminum was that they used. My '88 Cobra has sat with salt water in the Y pipe all season on the mooring approx. 15 years! Might have been a casting flaw/air bubble, weak spot that just corroded through as the rest of it does not look bad. Not sure if this helped but I always filled the exhaust with AF with corrosion inhibitors each winterization yes a lot of it runs out after the manis are full but maybe enough remains at the bottom to help.

I’d definitely try that out on every winterization , also checked for rot and is not present looks solid ,

 

[pyrotek]

Do you commonly have some water in the bilge? Like enough the bilge comes on once a week? Common issue is the steering pin leaks at the top and the water seeps down and drips off the bottom of the Y-pipe. Every Y-pipe I have seen has some corrosion exactly at the bottom two mount points.

 

[achris]

..Like enough the bilge comes on once a week? ....

I really hate it when the bilge on a boat comes off. Spoils my whole day.

(I assume you mean bilge pump)

 

[djmakko1]

Do you commonly have some water in the bilge? Like enough the bilge comes on once a week? Common issue is the steering pin leaks at the top and the water seeps down and drips off the bottom of the Y-pipe. Every Y-pipe I have seen has some corrosion exactly at the bottom two mount points.

Not likely I have water in the bilge , but after removing the Y pipe and check for possible leaks I found some corrosion next to the trim pump manifold where the two hoses connect to , my believe is the there was a small intrusion there enough to corrode the Y pipe on the long run. seal replaced only waiting for the new Y pipe , and also installed a second bilge pump just in case.

 

[CamaroMan]

if the metal is powdery or you can tap pieces it away with light taps from a hammer replace it - its ready to get swapped, do it now with motor out!

 

[djmakko1]

if the metal is powdery or you can tap pieces it away with light taps from a hammer replace it - its ready to get swapped, do it now with motor out!

its done , had to replace the gasket on the trims manifold water was sitting there in that pocket between the y pipe and manifold hose exit . changed flappers /still in good condition but since its out better doit now.