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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a new forum dedicated to diesel engines and their applicable accessories.


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Old 09-09-2012
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Confused About Reverse/Forward Gear

I have a 79 bayliner bucaneer with inboard deisel md7a penta. My owners manual shows I have a reverse gear box for reverse gear and it uses the same oil as the engine. Is the fluid for the forward gear transmission in that reverse gear box also "is reverse gear housing the same as forward gear or is the oil for the foward geard transmission from the engine itself? My freind has a motor in his sailboat and all the forward gear oil is in same place as engine oil. Is my forward gear oil the same as where the engine oil is like his since the box for reverse gear is called reverse gear and not transmission or forward transmission.
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Old 09-09-2012
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Re: Confused About Reverse/Forward Gear

Hello there, the term reverse gear doe's not mean the transmission has a separate housing for reverse. The term reverse gear means the reduction gear ratio is developed so that the engine turns opposite the rotation from the transmission when in forward.so with that in mind if your transmission is turning left hand. Your engine is turning right hand. A typical reverse gear contains both forward and reverse in the same housing.... Captg
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Old 09-09-2012
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Re: Confused About Reverse/Forward Gear

Same as a car transmission...one unit handles it all, both forward and reverse.
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Re: Confused About Reverse/Forward Gear

The reverse gear simple reverses the drive. The forward and reverse components of the gearbox will share the same lubricant.
Sample some of the gearbox oil. Just remove the dipstick and rub some of it onto your clean hand. If it has the odour of sulphur, it is gear oil and it will have its own self-contained oil bath. If it does not, it is probably engine oil lubricated (the gearbox shares the engine lubricant). If so, typically it gets black much quicker.

The gearbox on your engine has 3 settings - forward, neutral and reverse. It does not have a dedicated gearbox for reverse. It has a dedicated gear for it to reverse the drive, but it is not in a separate gearbox.
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Re: Confused About Reverse/Forward Gear

Thanks to everyone for clearing that up.
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Old 09-10-2012
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Re: Confused About Reverse/Forward Gear

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Originally Posted by Rockter View Post
The reverse gear simple reverses the drive. The forward and reverse components of the gearbox will share the same lubricant.
Sample some of the gearbox oil. Just remove the dipstick and rub some of it onto your clean hand. If it has the odour of sulphur, it is gear oil and it will have its own self-contained oil bath. If it does not, it is probably engine oil lubricated (the gearbox shares the engine lubricant). If so, typically it gets black much quicker.


.
I have never seen or heard of a marine setup where the gearbox shared the engine oil. Even in automobile use this is very rare.

Does anyone know of such a marine setup?
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Old 09-12-2012
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Re: Confused About Reverse/Forward Gear

Volvo specifies the same oil for the transmission as is used in the engine, but they are separate sumps. I can't imagine why a manufacturer would want to share the same oil between gerbox and engine. Is there such a creature?
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Old 10-26-2013
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Re: Confused About Reverse/Forward Gear

The Albin AD2 which was original in my 1969 Columbia 36 used a shared oil supply for engine and gear, just like most Japanese motorcycles. It had a separate reduction gear bolted onto the output shaft which had it's own sump and used the same type oil. It' the only one I've ever seen like.
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