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04-17-2018, 12:35 PM
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#1
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Veteran Member
City: Titusville,Fl
Vessel Name: Moonstruck
Vessel Model: 41' Defever
Join Date: Jan 2015
Posts: 97
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exhaust riser solenoid
Hi to all,
We have twin TAMD 41a Volvo's. The exhaust riser solenoid on the port engine has quit working. I'm having a hard time cross referencing the solenoid.
Does anyone know where to look?
Also, what exactly does the solenoid do and why?
Thanks
Gordo
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04-17-2018, 01:47 PM
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#2
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Guru
City: Walkabout Creek
Join Date: Jan 2013
Posts: 9,091
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I guess I don't know what an exhaust riser solenoid is. Can you elaborate?
__________________
MVTanglewood.com
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04-17-2018, 01:54 PM
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#3
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Guru
City: Cypress Landing Marina (NC)
Vessel Name: Heron (2)
Vessel Model: '88 Cape Dory 28 Flybridge #115
Join Date: Nov 2014
Posts: 1,305
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Quote:
Originally Posted by twistedtree
I guess I don't know what an exhaust riser solenoid is. Can you elaborate?
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I've got the later TAMD41P and there's no solenoid on the riser. It's basically an old school diesel with no wires other than a few sensors attached. Maybe you mean something else?
I've got the complete TAMD41A parts book if I can help you with numbers..
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Steve
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04-17-2018, 03:02 PM
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#4
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Technical Guru
City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 6,194
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I think that device is to choke off exhaust at cold idle to minimize blue smoke. I think you can disable it wide open or remove it with no issues. I don't think it did much anyway..
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04-17-2018, 03:06 PM
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#5
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Guru
City: Walkabout Creek
Join Date: Jan 2013
Posts: 9,091
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Quote:
Originally Posted by Ski in NC
I think that device is to choke off exhaust at cold idle to minimize blue smoke. I think you can disable it wide open or remove it with no issues. I don't think it did much anyway..
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Wow, really? If you choke it off, where does the exhaust go? Must be a partial restriction, maybe to retain heat while it warms?
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MVTanglewood.com
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04-17-2018, 03:51 PM
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#6
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Guru
City: Carefree, Arizona
Vessel Name: sunchaser V
Vessel Model: DeFever 48
Join Date: Apr 2008
Posts: 9,792
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Gordon
Could you post a picture? Be doubly sure it isn't something else, like a waste gate actuator or loss of raw water temperature sensor.
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04-18-2018, 12:17 PM
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#7
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Veteran Member
City: Titusville,Fl
Vessel Name: Moonstruck
Vessel Model: 41' Defever
Join Date: Jan 2015
Posts: 97
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I think it's called a stop solenoid. item 2a
I may have found a replacement, but any info would be appreciated.
Thanks to all
Gordo
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04-18-2018, 01:30 PM
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#8
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Valued Technical Contributor
City: Litchfield, Ct
Join Date: Aug 2012
Posts: 6,557
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What does this have to do with the exhaust riser?
A stop solenoid cuts off fuel to the engine by moving a lever on the injection pump to stop it.
David
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04-18-2018, 01:55 PM
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#9
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Veteran Member
City: Titusville,Fl
Vessel Name: Moonstruck
Vessel Model: 41' Defever
Join Date: Jan 2015
Posts: 97
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Quote:
Originally Posted by djmarchand
What does this have to do with the exhaust riser?
A stop solenoid cuts off fuel to the engine by moving a lever on the injection pump to stop it.
David
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This might be a dumb question, but why is it connected to the riser, also what happens if it doesn't work or is taken off? Can this be the cause of an overheating problem?
Thank
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04-18-2018, 04:15 PM
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#10
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Guru
City: Adelaide
Vessel Name: Kokanee
Vessel Model: Cuddles 30 Pilot House Motor Sailer
Join Date: Jul 2012
Posts: 3,215
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Ski is correct. Some of the TMD41A have a solenoid on the exhaust riser. There are a few different versions, and you need your engine serial number to confirm which version you have.
The exhaust solenoid is normally open but when the key is on, and the throttle is in the idle position, this solenoid closes to restrict and heat up the exhaust. The purpose to to minimize any smoke in the exhaust at idle.
The solenoid is supposed to open wide once the throttle is increased. If it is not opening fully, it would cause an overheating issue.
They are expensive to replace. If it was me, I'd consider removing the guts so it is always open.
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04-19-2018, 06:25 AM
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#11
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Veteran Member
City: Titusville,Fl
Vessel Name: Moonstruck
Vessel Model: 41' Defever
Join Date: Jan 2015
Posts: 97
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Quote:
Originally Posted by AusCan
Ski is correct. Some of the TMD41A have a solenoid on the exhaust riser. There are a few different versions, and you need your engine serial number to confirm which version you have.
The exhaust solenoid is normally open but when the key is on, and the throttle is in the idle position, this solenoid closes to restrict and heat up the exhaust. The purpose to to minimize any smoke in the exhaust at idle.
The solenoid is supposed to open wide once the throttle is increased. If it is not opening fully, it would cause an overheating issue.
They are expensive to replace. If it was me, I'd consider removing the guts so it is always open.
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Thank you so much for the explanation. I am going to do as suggested and
disable it so it is always opened.
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