Reply
 
Thread Tools Search this Thread Display Modes
 
Old 02-21-2017, 01:45 PM   #1
Guru
 
Giggitoni's Avatar
 
City: Vallejo, California
Country: United States
Vessel Name: Mahalo Moi
Vessel Model: 1986 Grand Banks 42 Classic
Join Date: Jun 2008
Posts: 1,764
Neglected Risers

Mahalo Moi has two Cat 3208 naturals. My engine temperatures have always been spot on. Both engines run between 175 and 185 degrees F.

A few months ago, one of my port engine risers developed a pin-hole leak; spitting raw water all over the engine room. The riser had corroded through after 30 years. I replaced those port-side risers and purchased a set of risers for the starboard side. I figured if the port side has blown through the starboard isn't far behind.

I replaced the starboard-side risers last Friday and captured a few images of their condition after 30 years. The flow of cooling water out the back of the boat has seemingly doubled! Don't neglect your cooling system.

My only regret is that I didn't take measurements of water temperature and flow before and after the riser replacement. I don't have quantitative numbers to share on the forum. But what a difference in visual flow!

Thanks go to FlyWright for his manual labor!
Attached Thumbnails
Click image for larger version

Name:	Riser3.jpg
Views:	187
Size:	137.3 KB
ID:	61817   Click image for larger version

Name:	Riser2.jpg
Views:	116
Size:	174.3 KB
ID:	61818   Click image for larger version

Name:	Riser1.jpg
Views:	103
Size:	127.6 KB
ID:	61819  
__________________
Advertisement

__________________
Ray
"Mahalo Moi"
1986 GB-42 Classic
ΜΟΛΩΝ ΛΑβΕ
Giggitoni is offline   Reply With Quote
Old 02-21-2017, 01:57 PM   #2
Enigma
 
RT Firefly's Avatar
 
City: Slicker?
Country: Bumpkin?
Join Date: Oct 2007
Posts: 12,722
Greetings,
Mr. G. Holy restrictions Batman! Thanks for the heads up. Yet another thing to check...So, are we to expect a new series of pictures in 2047?
__________________

__________________
RTF
RT Firefly is online now   Reply With Quote
Old 02-21-2017, 02:08 PM   #3
Guru
 
Giggitoni's Avatar
 
City: Vallejo, California
Country: United States
Vessel Name: Mahalo Moi
Vessel Model: 1986 Grand Banks 42 Classic
Join Date: Jun 2008
Posts: 1,764
[QUOTE=RT Firefly;525788]Greetings,
Mr. G. Holy restrictions Batman! Thanks for the heads up. Yet another thing to check...So, are we to expect a new series of pictures in 2047?[/QUOTE]

At 94 I'll be more concerned with MY risers. To heck with the boat!
__________________
Ray
"Mahalo Moi"
1986 GB-42 Classic
ΜΟΛΩΝ ΛΑβΕ
Giggitoni is offline   Reply With Quote
Old 02-21-2017, 02:24 PM   #4
Guru
 
Moonfish's Avatar


 
City: Port Townsend, WA
Country: USA
Vessel Name: Traveler
Vessel Model: Cheoy Lee 46 LRC
Join Date: Nov 2011
Posts: 952
You guys are hilarious!
__________________
Darren
Port Townsend, WA
m/v Traveler - '79 Cheoy Lee 46 LRC
https://www.pacificnwboatertested.com
Moonfish is offline   Reply With Quote
Old 02-21-2017, 02:57 PM   #5
Guru
 
High Wire's Avatar
 
City: Cape May, NJ and Englewood, FL
Country: USA
Vessel Name: Irish Lady
Join Date: Dec 2007
Posts: 2,808
Consider yourself very lucky the leak was external and not into the exhaust costing you an engine. BTDT on a delivery run!
__________________
Archie
1984 Monk 36 Hull #46
Currently southbound in South Carolina.
High Wire is offline   Reply With Quote
Old 02-21-2017, 04:35 PM   #6
Guru
 
Giggitoni's Avatar
 
City: Vallejo, California
Country: United States
Vessel Name: Mahalo Moi
Vessel Model: 1986 Grand Banks 42 Classic
Join Date: Jun 2008
Posts: 1,764
Archie,


Never thought of that. Good point.
__________________
Ray
"Mahalo Moi"
1986 GB-42 Classic
ΜΟΛΩΝ ΛΑβΕ
Giggitoni is offline   Reply With Quote
Old 02-21-2017, 05:17 PM   #7
Member
 
City: Stuart, Fl
Country: USA
Join Date: Jan 2017
Posts: 5
Cat exhaust risers

Just a "Heads Up"-New risers from CAT do not come with the required stainless steel spray rings. Did you order or install the spray rings?
Timcat is offline   Reply With Quote
Old 02-21-2017, 05:27 PM   #8
Guru
 
Giggitoni's Avatar
 
City: Vallejo, California
Country: United States
Vessel Name: Mahalo Moi
Vessel Model: 1986 Grand Banks 42 Classic
Join Date: Jun 2008
Posts: 1,764
Quote:
Originally Posted by Timcat View Post
Just a "Heads Up"-New risers from CAT do not come with the required stainless steel spray rings. Did you order or install the spray rings?
No. Tell me about them, Please.
__________________
Ray
"Mahalo Moi"
1986 GB-42 Classic
ΜΟΛΩΝ ΛΑβΕ
Giggitoni is offline   Reply With Quote
Old 02-21-2017, 05:53 PM   #9
Guru
 
Max Simmons's Avatar
 
City: Everett, WA
Vessel Model: Ocean Alexander 38'
Join Date: Oct 2007
Posts: 608
What, if any, preventative maintenance can be done to eek out a longer lifespan?
Max Simmons is offline   Reply With Quote
Old 02-21-2017, 06:14 PM   #10
Enigma
 
RT Firefly's Avatar
 
City: Slicker?
Country: Bumpkin?
Join Date: Oct 2007
Posts: 12,722
Greetings,
Mr. MS. Testosterone supplements? (post #3)
__________________
RTF
RT Firefly is online now   Reply With Quote
Old 02-21-2017, 06:32 PM   #11
Guru
 
Giggitoni's Avatar
 
City: Vallejo, California
Country: United States
Vessel Name: Mahalo Moi
Vessel Model: 1986 Grand Banks 42 Classic
Join Date: Jun 2008
Posts: 1,764
Red face

Ha!

Max Simmons,

The only maintenance item I can think of is to make sure our engines are galvanically protected and the zincs are changed regularly. The elbows on my 3208 have a zinc in the bottom of each lower 90.
__________________
Ray
"Mahalo Moi"
1986 GB-42 Classic
ΜΟΛΩΝ ΛΑβΕ
Giggitoni is offline   Reply With Quote
Old 02-21-2017, 10:20 PM   #12
Member
 
City: Stuart, Fl
Country: USA
Join Date: Jan 2017
Posts: 5
CAT 3208 Ex. Risers

Mr. Ray,

If you look closely at your old risers you will notice a Stainless Steel spray ring in the outlet or hose connection area. The ring is pressed onto the neck of the riser. There is also a locating pin about 2" long that goes down into the riser jacket. The spray ring is required, as it is designed to spray water into the hot exhaust gases, thus cooling gases to prevent the exhaust hoses from excessive temperatures (1,000 f) Or, your "NEW" ? exhaust hoses will prematuraly fail if the spray rings are omitted. Best to order four new spray rings from Cat, as it is extremely difficult to remove rings from the old risers. Cheers!
Timcat is offline   Reply With Quote
Old 02-21-2017, 10:34 PM   #13
Guru
 
Ken E.'s Avatar
 
City: Bellingham WA
Country: United States
Vessel Name: Hatt Trick
Vessel Model: 45' Hatteras Convertible
Join Date: Nov 2016
Posts: 956
Quote:
Originally Posted by Max Simmons View Post
What, if any, preventative maintenance can be done to eek out a longer lifespan?
At 30 years old, cast iron manifolds and risers in a salt water environment, you're way ahead of the game that they've lasted that long. I wonder when Cat says they should be changed.
Ken E. is online now   Reply With Quote
Old 02-21-2017, 10:43 PM   #14
Master and Commander
 
markpierce's Avatar
 
City: Vallejo CA
Country: USA
Vessel Name: Carquinez Coot
Vessel Model: penultimate Seahorse Marine Coot hull #6
Join Date: Sep 2010
Posts: 11,415
Yikes! No wonder you haven't been boating much in months. First the leaking fuel tanks, and now this. Hope everything gets in order for the upcoming boat season. (Current conditions have been unfavorable for boating (high winds, heavy rains, and much flotsom), unusual for your and my location.

__________________
Kar-KEEN-ez Koot
markpierce is offline   Reply With Quote
Old 02-21-2017, 10:57 PM   #15
TF Site Team
 
FlyWright's Avatar
 
City: California Delta and SF Bay
Country: Sacramento, CA, USA (boat in Vallejo)
Vessel Name: FlyWright
Vessel Model: Marshall Californian 34 LRC
Join Date: Apr 2008
Posts: 12,333
Quote:
Originally Posted by Timcat View Post
Mr. Ray,

If you look closely at your old risers you will notice a Stainless Steel spray ring in the outlet or hose connection area. The ring is pressed onto the neck of the riser.
There was an assembly with what looked like a set of stators and a ring mounted into the top end of the riser. Is that what you're describing?

A picture would really help. Got a picture?
__________________
My boat is my ark. It's my mobile treehouse and my floating fishing cabin. It's my retreat and my respite. Everyday I thank God I have a boat! -Al

@DeltaBridges - 25 Delta Bridges in 25 Days
FlyWright is offline   Reply With Quote
Old 02-22-2017, 12:12 AM   #16
Guru
 
Giggitoni's Avatar
 
City: Vallejo, California
Country: United States
Vessel Name: Mahalo Moi
Vessel Model: 1986 Grand Banks 42 Classic
Join Date: Jun 2008
Posts: 1,764
Timcat,

I have found a photo showing the hose end of the elbow. That end only shows "slots". Is this where the stainless spray ring goes? Is there a Cat part number that you're aware of? Can the rings be installed with the risers in place or must they be removed and taken to a shop?
Attached Thumbnails
Click image for larger version

Name:	IMG_8027.jpg
Views:	95
Size:	175.4 KB
ID:	61842  
__________________
Ray
"Mahalo Moi"
1986 GB-42 Classic
ΜΟΛΩΝ ΛΑβΕ
Giggitoni is offline   Reply With Quote
Old 02-22-2017, 01:10 PM   #17
Member
 
City: Stuart, Fl
Country: USA
Join Date: Jan 2017
Posts: 5
3208 Ex. Riser

CAT part # is 8L3498 plate assem. Yes, depending on access they can be installed in place. Usually assem. with never seize.
Timcat is offline   Reply With Quote
Old 02-22-2017, 01:25 PM   #18
Guru
 
Giggitoni's Avatar
 
City: Vallejo, California
Country: United States
Vessel Name: Mahalo Moi
Vessel Model: 1986 Grand Banks 42 Classic
Join Date: Jun 2008
Posts: 1,764
I just ordered the part (x4) from my local Cat store. Thanks for the "heads up"! You're the man!
__________________
Ray
"Mahalo Moi"
1986 GB-42 Classic
ΜΟΛΩΝ ΛΑβΕ
Giggitoni is offline   Reply With Quote
Old 02-23-2017, 01:30 AM   #19
Guru
 
City: Anacortes
Country: USA
Join Date: Nov 2012
Posts: 778
After roughly year 3, you will need to start annual inspection and clean out of plugged holes in the shower head.

When my risers came out, I could push a screwdriver through the back side of the exhaust outlet. There was enough drop from the manifolds that the engine miraculously stayed dry.
ghost is offline   Reply With Quote
Old 03-02-2017, 05:50 PM   #20
Guru
 
Giggitoni's Avatar
 
City: Vallejo, California
Country: United States
Vessel Name: Mahalo Moi
Vessel Model: 1986 Grand Banks 42 Classic
Join Date: Jun 2008
Posts: 1,764
I installed the spray rings which were brought to my attention by our very own Timcat! Thanks, Timcat...I owe you a cold one!
Attached Thumbnails
Click image for larger version

Name:	IMG_8799.jpg
Views:	207
Size:	91.4 KB
ID:	62281  
__________________

__________________
Ray
"Mahalo Moi"
1986 GB-42 Classic
ΜΟΛΩΝ ΛΑβΕ
Giggitoni is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





All times are GMT -5. The time now is 03:48 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012
×