Exhaust hose classic 27

[cmwahl]

Hi,

We are approaching the 800 hour service on our classic 27 with the Volvo D3 200. The specific 800 hour replacement items are the exhaust hose, Drive belts, and Rudder actuator, oil. Has anyone done these themselves? Any tips? Difficulties?

Cindy and Brent
Kiorana

 

[Red Raven]

Hi Cindy and Brent,

I had the same question about the exhaust hose. Replacement seemed a bit severe and overly conservative. After discussing with other owners I decided to throughly inspect instead. I used a cheap borescope to inspect the inside and physically checked for any signs of age or wear along it’s length on the outside as well. It really looks like it is brand new to this day and have chosen to not replace it due to the cost and difficulty. More importantly, I would check your stainless exhaust outlet for corrosion. Failure there could be catastrophic!

I changed all the belts and coolant, inspected the rudder actuator, and greased the rudder post.

Curt

 

[Chimo]

Hi Cindy and Brent,

More importantly, I would check your stainless exhaust outlet for corrosion. Failure there could be catastrophic!

Curt

thanks Curt,

Is there a way to check this stainless exhaust outlet while the boat is in the water? if not, what's the procedure please?

David

 

[cmwahl]

Thanks Curt. That’s what we will do too. But after the solar project upgrading our controller, batteries to lithium and rewiring the anchor light that burned through its wires and destroyed two batteries.

 

[Red Raven]

Hi David,

This info assumes the R25SC is the same as the R27 Classic in this area. I believe it is.

Unfortunately a complete check requires pulling the boat and removing the exhaust hose from the exhaust port thru hull. While the boat is in the water, however, you can look for signs of water intrusion in the form of rust stains/corrosion/water intrusion on the inside of the hull by viewing the stainless outlet via the aft port corner of the battery compartment. You can use your phone camera to get photos around the exhaust port thru hull. If there are significant signs of seepage of seawater it is time to pull the boat and do further inspection and possible replacement.

If and when you do pull the boat, remove the exhaust hose from the thru hull to check the integrity of the flange via the battery compartment. If there is corrosion on the thru hull hose flange it should be obvious once the hose is removed (again with a phone camera. Note that if there is sea water seepage it can be coming from the exhaust hose near the fitting or (worse) from the exterior of the boat. If it is the hose connection then a set of new hose clamps and/or tightening may be sufficient. If the seepage is coming from the exterior of the hull then pulling the exhaust port thru hull will be necessary along with associated replacement and/or re-bedding. In any case this is a good time to bond the exhaust outlet to the bonding system if it is not already.

See the following related post for more info:

http://www.tugnuts.com/viewtopic.php?f=2&t=18714&p=122568&hilit=exhaust+corrosion#p122568

Curt

 

[knotflying]

As far as exhaust hose replacement goes; I had 1,580 hours on my R-27 and it was 10 years old. During the survey it was discovered that it had developed "chinks" on the outside. Similar to what you see on old tires. I did put a bore scope up and it looked good on the inside. However, the new owner opted to replace it and if I were keeping the boat I would have also. My point is, you should check the exhaust hose, fittings and clamps annually and replace at the first sign of deterioration. The exhaust hose and the connection at the outlet can be a catastrophic event if it should get compromised.

 

[Kiorana]

Thanks Curt for the tips. Fortunately it looks like our classic R27 has a different exhaust port than those in the message threads that are bolted in with screws that are corroding off. Is your R27 setup this way or are we just lucky? The port appears to be secured on the inside of the hull by a large stainless threaded shank nut similar to a sink strainer basket nut. There is a little bit of corrosion on the threads of the port and the nut with a rust stain beneath. The hose clamps are tight and the hose looks new on the outside and inside. There is no bonding wire installed. I think there has been some seawater intrusion at some point so I probably should inspect the exhaust port bedding as it probably needs redoing and install that missing bonding wire. I put a picture of the port in our photo album (I can’t figure out how to directly attach it to this message).
Brent

 

[Red Raven]

Hi Brent,

Mine looks much like yours but a bit more rust stain on the hull. I have been monitoring it through the season and have not seen any increase in seepage. I plan to pull the boat for the season and inspect it further this winter with potential re-bedding.

You may want to just clean up the rust stain and then monitor it. If it doesn’t recur it may be better to leave it as is as it looks pretty good. Don’t fix what is not broken!

Curt