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Old 26-07-2015, 23:55   #1
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Need Volvo Penta MD7A Reverse Gear Clarification/Help Please

Hi,
Just picked up an Aquarius Pilot Cutter and it has a Volvo Penta MD7A with a reverse gear.

I am a bit confused by the dynamics of the reverse gear and have included a PDF for your confusion (perusal) (Edit: or just scroll down for jpg image).

So the reverse gear contains water AND oil? How does this work? I don't get it. Could someone explain how this is useful and what is happening to cool/lubricate the drive.

AND, how do I best care for this device?

Thank you,
Eric
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Old 27-07-2015, 00:02   #2
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Re: Need Volvo Penta MD7A Reverse Gear Clarification/Help Please

Just realized I could also make a jpg of the manual instead. Here it is.
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Old 27-07-2015, 03:46   #3
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Re: Need Volvo Penta MD7A Reverse Gear Clarification/Help Please

My experience is only with the MD17D and one thing I haven't had to deal with is the gearbox ( fingers crossed etc).
I do know however that after leaving the water pump">raw water pump on the back of the engine the water goes in one side of the gearbox and out the other... then onwards and upwards into the exhaust mixer.

This as I understand it is what is going on.... different engine... found that info here Foley Engines | 100 Years of Expert Advice

"5. Transmission Coolers. Despite your best intentions for a variety of reasons some transmissions will run hot. In addition to the problems caused by severe use and getting tangled in a line, some gears are simply underspeced. The Perkins 4108 is rated at 50 HP at 4000 RPM yet many boat builders equip them with the HBW 100 which is not rated for this. One could install a more appropriate transmission such as the HBW 150 with 37% more fluid (0.63 quarts versus 0.44 quarts), and shorten the shaft to accomodate the longer HBW 150. Or, recognizing that heat is the enemy of gears you can increase the torque capacity of the gear that you now have. The first step is to upgrade to a better transmission fluid which we discussed above. The next step is to install a transmission cooler. Hurth mechanical gears don't have a provision for the long oil coolers composed of a "tube with a bundle inside" as seen on Borg Warner and Hurth hydraulic gears. To mount a cooler on a Hurth mechanical gear, Foley Engines can supply a small aluminium box that installs on four pre- drilled holes on the outside of the transmission's case. Raw water is run to and through the small box (about the size of three stacked decks of playing cards) and it cools the fluid inside the transmission. This Foley Cooler Kit works so well that it effectively changes the torque capacity of the Hurth HBW 100 to that of the HBW 150. It is a very cost effective way to upgrade your drive train."

Seems Volvo gearboxes have a built in cooler...
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Old 27-07-2015, 05:18   #4
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Re: Need Volvo Penta MD7A Reverse Gear Clarification/Help Please

The MS or MSB transmission which you have on your MD7 engine consists of a main gear box housing with the shifter on the top, and a reduction housing bolted to the rear of the main housing. The oil cavity in the gear box is in the main housing and also extends internally into the reduction housing.

The reduction housing also has a water cooling passage which is built into the cast iron of the reduction housing. This water passage surrounds the reduction housing, but is seperate from the oil cavity and does not allow the oil and water to mix. When the engine is running, the sea water pump pulls water thru the water passage on its way from the thru hull valve to the pump, and this water flow cools the gear box oil and prevents it from becoming too hot.

There isn't much maintenance for the cooler to speak of, just keep it cleaned out and be sure to drain it if and when you winterized the engine.

DougR
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Old 27-07-2015, 06:49   #5
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Re: Need Volvo Penta MD7A Reverse Gear Clarification/Help Please

Thanks to you both! That explains a lot, and also gives me an idea of how it should actually be hooked up. Back to work.
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Old 27-07-2015, 11:19   #6
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Re: Need Volvo Penta MD7A Reverse Gear Clarification/Help Please

Here is a link to the shop manual for the MSB if you'd like it.
I rebuilt mine last year, what a chore.

https://www.dropbox.com/s/599clah8gh...anual.pdf?dl=0
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Old 27-07-2015, 23:31   #7
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Re: Need Volvo Penta MD7A Reverse Gear Clarification/Help Please

Great! Thanks for the MSB shop manual. I really am hoping I won't have to do any rebuilding. Refurbing--simple parts replacement and long overdue maintenance, has been trying enough.
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Old 13-04-2016, 01:37   #8
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Re: Need Volvo Penta MD7A Reverse Gear Clarification/Help Please

I just pulled my Volvo MD11C on Easter weekend. The reverse gear is in very good condition. I will let it go for a very resonable price. I would like to sell the engine with it if you need it for parts. I have a recent balmar regulator and marine alternator also. I am located in Columbia SC. I will be glad to let it go very cheap. Austin
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Old 13-04-2016, 05:16   #9
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Re: Need Volvo Penta MD7A Reverse Gear Clarification/Help Please

Greetings and welcome aboard the CF, Austin.
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Old 13-04-2016, 05:40   #10
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Re: Need Volvo Penta MD7A Reverse Gear Clarification/Help Please

Thanks GordMay,

I have spent plenty of time and money on the Volvo. Lol I am in the process of re-powering my BABA 30.
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Old 13-04-2016, 05:48   #11
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Re: Need Volvo Penta MD7A Reverse Gear Clarification/Help Please

Hey Austin, I've got an MD11C in a Baba 30 that I'm trying to get a little more life out of. I'd be interested in that Alternator and controller. Shoot me a PM.
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Old 31-05-2016, 20:42   #12
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Re: Need Volvo Penta MD7A Reverse Gear Clarification/Help Please

Hi. I'd be interested in the transmission if you still have it.
Bill
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Old 02-06-2016, 10:42   #13
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Re: Need Volvo Penta MD7A Reverse Gear Clarification/Help Please

Bill, It is still available. I am in Mexico but will be back next week and I will follow up. I have the Baba listed on Southwindsmagazine with my contact info. Feel free to give me a call next week. Thanks, Austin
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Old 05-06-2016, 14:59   #14
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Re: Need Volvo Penta MD7A Reverse Gear Clarification/Help Please

Bill,

I am back if you want to discuss the reverse gear, feel free to give me a call.

803 397 9448 thanks Austin
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Old 05-06-2016, 15:03   #15
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Re: Need Volvo Penta MD7A Reverse Gear Clarification/Help Please

Bill,

I am back if you want to discuss the reverse gear, feel free to give me a call.

803 397 9448

thanks,

Austin
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