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Author Topic: exhaust riser and manifold for mark 2 1997  (Read 370 times)

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captran

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exhaust riser and manifold for mark 2 1997
« on: July 06, 2020, 09:08:56 PM »

A mechanic came aboard to look at one thing, but also poked around a bit (I'm sure that will cost extra), but he said "the exhaust manifold adaptor to the exhaust manifold is leaking exhaust.  there is heavy rust is also present at the dry exhaust section".    said "to drain coolant, disassemble and inspect the unit , remove exhaust, and replace" he puts the labor time estimate of 24 to 32 hours.  I am not that handy.  but also, when I look at it, it seems about the same as it has always been.  Going to just do a six week cruise this year, but should I have it done in the off season?   I saw some posts on the older Mrk 1's but nothing on the Mark 2.
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Randy Thies
Voyager  1997 #1345
was Florida, now Anacortes Wa

Jon W

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Re: exhaust riser and manifold for mark 2 1997
« Reply #1 on: July 06, 2020, 09:56:28 PM »

If it’s leaking, it should be replaced. Depending on where the crack is, you could be leaking carbon monoxide into the cabin.

I have a 1987 MK 1. Each boat and vintage seems to be a little different, so the following is just a reference point for you.

I replaced the hose from the exhaust riser to the Aqualift muffler with a Trident silicone “hump” hose.

To do that I prepped the area to get access to everything. The steps were remove coolant, loosen the hose clamps, remove the riser, clean off the old gasket, remove the old hose, check Aqualift muffler for cracks, install the new “hump” hose, reinstall the riser with new gasket and sealant, add coolant, bleed coolant system. Time to do all of that was about 1 hour.

Does his 24-32 hour estimate include making a new riser? When you do this I highly recommend installing a “hump” hose instead of the standard exhaust hose. Really helps dampen engine vibration.
« Last Edit: July 06, 2020, 10:07:25 PM by Jon W »
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Jon W.
s/v Della Jean
Hull #493, 1987 MK 1, M25XP, Manson Supreme 35
San Diego, Ca

captran

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Re: exhaust riser and manifold for mark 2 1997
« Reply #2 on: July 06, 2020, 10:19:23 PM »

Wow.  guess that question will be part of the conversation.  kept looking after my post and found a new post that didn't show up with a word search which addresses my exact model year, with two variations, so will share that with north harbor diesel and see what they say re ordering vs making.  I thought the 24-32 hours was a bit much, but sure didn't see an hour to do all that coming.  hopefully we'll get our cruise in and explore options after lay up.  living 350 miles from the boat doesn't make it any easier.  thanks for the info!!!
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Randy Thies
Voyager  1997 #1345
was Florida, now Anacortes Wa

KWKloeber

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Re: exhaust riser and manifold for mark 2 1997
« Reply #3 on: July 06, 2020, 11:10:27 PM »


exhaust manifold adaptor ... leaking exhaust. 


Randy

I presume he's referring to the exhaust flange?  (removing and fixing the leak, presumably could be as "easy" as a new gasket.)
 
The unfortunate reality is that the vast majority of time/effort/lost skin on knuckles/cost is getting the old parts apart w/o ruining them (if that's even possible,) and if new studs are needed and/or if the flange can be reused or needs replacing -- so that simply fixing that leak and not replacing the whole shebang seems a waste.  e.g., How many years will it be before the riser needs to be replaced (if indeed it's only rusty and not about to fail.)  Make sure the new gasket goes on facing correctly -- on backward, you dump all your coolant out the exhaust (and need to start all over.)

-ken
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captran

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Re: exhaust riser and manifold for mark 2 1997
« Reply #4 on: July 07, 2020, 07:17:58 AM »

I suspect it may be bad and in need of replacement, as he says it leaks exhaust.  with the engine cooled I'll start to poke around to see if its just the riser or the flange.  I just don't know enough to know what to look for.
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Randy Thies
Voyager  1997 #1345
was Florida, now Anacortes Wa

Ron Hill

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Re: exhaust riser and manifold for mark 2 1997
« Reply #5 on: July 07, 2020, 03:02:15 PM »

Randy : I believe that Ken is correct.  If it is the Gasket between the exhaust flange and the exhaust manifold all you need is a $5 gasket!!

Can't recall when Gerry Douglas said the hump hose was standard C34 MKII production - thought it was with the first MKII hull # 1295?

A few thoughts

 
« Last Edit: July 21, 2020, 02:39:34 PM by Ron Hill »
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Jon W

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Re: exhaust riser and manifold for mark 2 1997
« Reply #6 on: July 07, 2020, 03:24:26 PM »

Randy, if Ron’s memory is correct your number boat should have a silicone “hump” hose installed. If it were me I would put in a new silicone “hump” hose. The boat is 23 years old, and if you’re removing the exhaust riser for repairs, it’s a perfect time to also change that hose and check the Aqualift muffler for cracks. Then you know that system is good for a long time.
« Last Edit: July 07, 2020, 03:27:08 PM by Jon W »
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Jon W.
s/v Della Jean
Hull #493, 1987 MK 1, M25XP, Manson Supreme 35
San Diego, Ca

captran

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Re: exhaust riser and manifold for mark 2 1997
« Reply #7 on: July 09, 2020, 03:05:50 PM »

Looks like I have some homework to to as to what and where the silicone hump hose connects.  I do have an engine manual since I won't have much internet over the coming weeks.
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Randy Thies
Voyager  1997 #1345
was Florida, now Anacortes Wa

Stu Jackson

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Re: exhaust riser and manifold for mark 2 1997
« Reply #8 on: July 09, 2020, 04:25:29 PM »

The hump hose connects from the end of the exhaust riser to the muffler.
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Noah

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Re: exhaust riser and manifold for mark 2 1997
« Reply #9 on: July 09, 2020, 04:39:52 PM »

This is a hump hose:
Disregard the rust. Been cleaned up since photo. 8)
« Last Edit: July 09, 2020, 04:43:30 PM by Noah »
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Jon W

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Re: exhaust riser and manifold for mark 2 1997
« Reply #10 on: July 09, 2020, 05:41:02 PM »

To avoid any cornfusion, the blue hose is the “hump” hose.  8)
« Last Edit: July 09, 2020, 05:41:42 PM by Jon W »
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Jon W.
s/v Della Jean
Hull #493, 1987 MK 1, M25XP, Manson Supreme 35
San Diego, Ca

captran

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Re: exhaust riser and manifold for mark 2 1997
« Reply #11 on: July 21, 2020, 07:24:54 AM »

Jon, thanks for the pic of the hump hose.  I dont remember seeing a blue hose going into the muffler but will look again.
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Randy Thies
Voyager  1997 #1345
was Florida, now Anacortes Wa

Ron Hill

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Re: exhaust riser and manifold for mark 2 1997
« Reply #12 on: July 21, 2020, 02:46:31 PM »

Guys : The MKII C34 has a different muffler that that of a C34 MKI. 
That hump hose is fairly resilient and I'd call Tri Dent and ask them about the life span of their hump hose.

A few thoughts
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KWKloeber

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Re: exhaust riser and manifold for mark 2 1997
« Reply #13 on: July 21, 2020, 08:10:25 PM »


 I just don't know enough to know what to look for.


Rsndy

if you mean for the leak itself, you can usually tell/locate an exhaust leak w/ her running.  If you puff some baby powder around there you might see a telltale exhaust leak blowing it.

If you mean generally, you need to unwrap it, and start poking the bear to determine if it's all competent pipe or corroded/thinning.  If you whack at it and it's competent it shouldn't dent (heavy pipe.) 

A screwdriver or heavy icepick will tell you if you can puncture the riser anywhere or if it's about "to go."  Or tap on it w/ a small ball pein hammer to locate weal spots (sound different) 

Elbows and the water injection wye are typical fail points.
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Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
So throw off the bowlines.  Sail away from the safe harbor.  Catch the tradewinds in your sails.
Explore.  Dream.  Discover.   -Mark Twain

captran

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Re: exhaust riser and manifold for mark 2 1997
« Reply #14 on: August 04, 2020, 03:11:04 PM »

thanks.  First internet access in over 2 weeks, so will start exploring.
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Randy Thies
Voyager  1997 #1345
was Florida, now Anacortes Wa
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