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06-17-2016, 02:32 AM
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#1
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Veteran Member
City: Belgrade
Join Date: Jun 2016
Posts: 44
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Borg Warner/Velvet Drive 72 - Question about pressure sender port
Where exactly am I supposed to connect the pressure sender? On the diagram in the service manual, there are three ports, and I have attached the mentioned diagram here. One port for the oil to the cooler outlet, one for the mainline pressure tap and one for reverse clutch pressure tap. So I have attached the hose to oil to the cooler outlet, I have attached mechanical pressure gauge to the reverse clutch pressure tap, and I have attached the electrical pressure sender to the mainline pressure tap. Mechanically, everything runs perfect (gearbox is new). When in reverse I do read the pressure on mechanical gauge, but in forward there is no pressure on electrical sender (no reading at the gauge). Sender, gauge and the wiring are OK (checked twice). Am I reading this diagram wrong, should I connect the sender to the cooler outlet? Where am I mistaking?
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06-17-2016, 08:12 PM
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#2
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Guru
City: Brookline, NH
Vessel Name: Shalloway
Vessel Model: Defever 44, twin Perkins
Join Date: Sep 2013
Posts: 2,260
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I think you're reading it right. Try putting the mechanical gauge in the mainline port
Ken
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06-17-2016, 08:25 PM
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#3
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Enigma
City: Slicker?
Join Date: Oct 2007
Posts: 16,565
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Greetings,
Welcome aboard Mr. N.
__________________
RTF
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07-01-2016, 03:05 AM
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#4
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Veteran Member
City: Belgrade
Join Date: Jun 2016
Posts: 44
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Thank you very much for the welcome and for the response. I will try putting mechanical one in mainline port, I would have done that already, but fittings are different, so I have to find or build the adapter first or find the mechanical gauge that fits for test purposes.
I must say that I have just joined this forum, but I am reading this forum for quite some time and I have found many useful information, especially during my boat renovation/restoration process.
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02-23-2020, 08:15 PM
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#5
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Member
City: Sausalito
Vessel Name: Gemini Girl
Vessel Model: Golden Star 38'
Join Date: Apr 2014
Posts: 8
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Pressure Guage fitting to Velvet Drive
What is the thread requirement to fit a pressure guage directly to a Velvet Drive...
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02-23-2020, 09:04 PM
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#6
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Guru
City: Oconto, WI
Vessel Name: Best Alternative
Vessel Model: 36 Albin Aft Cabin
Join Date: Oct 2012
Posts: 3,145
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I'm a little lost. Why is this important?
pete
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02-23-2020, 09:41 PM
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#7
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Member
City: Sausalito
Vessel Name: Gemini Girl
Vessel Model: Golden Star 38'
Join Date: Apr 2014
Posts: 8
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Fitting Oil Pressure Gauge to Velvet Drive
I am new at trying to fix my own transmission but following on from the post above there seamed to be some question about the thread to fit an oil pressure gauge to check pressure on a Velvet Drive...
My Velvet Drive decided to stop selecting either F or R gears two days ago. So before I pull the box of the back of my Perkins Ranger 200 engine I thought I would try and do some fault finding, The manual seamed to indicate it would be prudent to check old pressure.... hence my question so I can source a guge with the correct thread
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02-24-2020, 08:43 AM
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#8
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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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Could be a failed drive plate (torsional coupling). Oil level ok?
I think that on these if the drive plate is intact, if you take dipstick out with engine idling there will be oil splashing around in there. No splash means guts are not spinning, so drive plate is suspect.
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02-24-2020, 10:45 AM
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#10
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Guru
City: Palm Coast, FL
Vessel Name: Coquina
Vessel Model: Lagoon 380
Join Date: Jan 2017
Posts: 2,570
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Quote:
Originally Posted by tedt_2778
What is the thread requirement to fit a pressure guage directly to a Velvet Drive...
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I believe a 3/8" x 18 NPT for the oil pump pressure (line pressure in the manual). My manual shows this port to be the same size as the Oil cooler return line port. There is also a 1/8" NPT nearby for the reverse clutch pressure.
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02-24-2020, 12:22 PM
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#11
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Guru
City: Boston
Vessel Name: Adelante
Vessel Model: IG 30
Join Date: Nov 2016
Posts: 1,609
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Quote:
Originally Posted by tedt_2778
My Velvet Drive decided to stop selecting either F or R gears two days ago. So before I pull the box of the back of my Perkins Ranger 200 engine I thought I would try and do some fault finding, The manual seamed to indicate it would be prudent to check old pressure
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First try shifting via lever on side of transmission to make sure it's not a simple linkage problem.
Then remove one of the set screws. Start engine with stop solenoid engaged. Cover set screw hole with rag. Oil should flow out of hole when engine turns. Failure to do so would indicate bad oil pump or clogged control valve.
Control valve is easy to check. one nut on linkage side, 3 bolts on the other. Pretty obvious if it's clogged with sludge. If not, transmission needs to be removed.
Oil pump is not that expensive. Simple replacement. 4 bolts. If I removed the transmission I would replace the clutch plates and install a new damper plate. Hardest task is removing/reinstalling transmission. Once you pull it, overhaul it.
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02-25-2020, 11:10 AM
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#12
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Member
City: Sausalito
Vessel Name: Gemini Girl
Vessel Model: Golden Star 38'
Join Date: Apr 2014
Posts: 8
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Thanks to all for your feedback and advise - very encouraging.
Last night I fired up the Starboard Perkins Ranger 200 and looked down the Velvet Drive Dipstick hole - there was no movements or oil slopping around in N, F or R. I did not open one of the set screws. I think it is a safe assumption that the Transmission of not engaged with the flywheel and I need to replace the Damper?? As I look at this job and other posts I note my rear engine mounts are attached to the bell housing. What does the team think/know about being able to change the Damper without removing the bell housing, just taking out the transmission?
If I get the Transmission off I think I will also take your advise and have the gearbox rebuilt by a professional while it is out - even if this is not the issue.
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02-25-2020, 11:35 AM
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#13
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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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Check for splashing in your good port gearbox, just as a sanity check.
Yes, with mounts on engine that simplifies pulling the tranny. Need to back prop shaft back a few inches. A zinc in front of a strut can prevent that, or a prop real close to a rudder.
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02-25-2020, 12:19 PM
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#14
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Veteran Member
City: New Orleans
Vessel Name: Czech Mate
Vessel Model: President 41
Join Date: Jan 2017
Posts: 82
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I used Transmission Marine in Fort Lauderdale for my rebuild. Highly recommend FYI.
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