I know that this has been talked about a lot but here is a xouple of additinal questions.
First, Can a I assume that the hose can be replaced without taking the riser off? Any tricks?
Second, my existing black hose is 9 1/4 in long and the hose from Cat. Dir. is 8 in long. I'm going to warm up the engine to see if I can feel the edges of the riser down pipe and the muffler up pipe to see in the 8 in. would be long enough. I could always take the old one off but I'm afraid I will damage it in the process so I would like to have a suitable replacement on hand.
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Neil Roach
"Crewless"
1992 36, Mark I
Hull # 1174
Seattle
I had to cut the old hose off then had no problem putting the new blue colored flexable hump hose on. Make sure you order four clamps because the hose should be double clamped on both ends.
__/)__/)__/)__Capt Mike__/)__/)__/)__
Punta Gorda Florida
1990 Std WK M35 Hull #1050
Replaced the riser on my M35A and recall the hose was too long and inflexible to take off without either cutting or removing the riser. I did order the longer hump hose from CD but ended up trimming about 1" from each end to fit correctly.
Gary Smith
93 MK I, Hull #1231
Std rig; wing keel
M35A Oberdorfer conversion
In most cases the riser is threaded into the flange at the aft end of the manifold with a union. This should allow you to move the muffler end of the riser as necessary to install the hump hose. Trimming may be required.
Stu Jackson, C34IA Secretary, C34 #224, 1986, SR/FK, M25 engine, Rocna 10 (22#)
THE OUTCOME
At the end of the day the hump hose from Cat. dir. is 8 1/2 inches long, about 3/4 inch shorter than the one which has been on my boat. Squeezing the old hose with a set of channel locks identified the ends of the connecting tubes so I determined that the 8 1/2 would be long enough.
As predicted, getting out the old hose amounts to a lot of cutting of rubber and cutting the internal wires, anyway, about half an hour. Installing the new hose took a couple of minutes with a little liquid soap as a lubricant.
I was able to do all of this without removing any cabinet work. I only had to remove the engine cover and the covers over the centerline water tank and the muffler.
During the leak test it seemed that the whole thing ran smoother and quieter, we'll see if that holds true on the way to Canada next wek.
Thanks to all for their help and advice.
Neil Roach
"Crewless"
1992 36, Mark I
Hull # 1174
Seattle
How many have been successful at installing a new hump hose without removing the exhaust riser or loosening the union? I removed the existing pump hose w/o wire (and not a hump hose) without difficutly. It was only 5" long without much overlap. Is the 6" hump hose flexible enough slip in or is is rigid?
Russell Green
S/V "GoodwiII" #759
1987 C36 MKI TR/WK M25XP
Moored: Deale, MD
I couldn't do it; had to unbolt the riser at the flange from the exhaust manifold.
Not a big deal (other than having to refill the antifreeze and "burp" to coolant), but make sure to have another gasket handy in case you need to renew it.
Matthew Chachère
s/v ¡Que Chévere!
(Formerly 1985 C36 MKI #466 tall rig fin keel M25)
2006 Catalina Morgan 440 #30.
Homeported in eastern Long Island, NY