Fluid capacity for Hurth 50 Transmission

Two quick questions if i may? I've been trying to locate a definitive answer to the question of what is the recommended fluid capacity for the Hurth HBW-50 transmission, which is behind my Universal M-25 on an E32. I have seen .29 quarts, .44 quarts, and 1.3 pints. Does anyone know for sure?

Also, does anyone happen to know if the fill-line on the transmission dip stick takes into account the installation angle of the engine/transmission or was it "cut" to read "full" only when perfectly level? I have this sneaking suspicion that some of the many Hurth 50 failures may have been caused by owners keeping the fluid level too low, when trying to match the fill mark on the dip stick if they have an angled installation. The fact that the dip stick is set aft in the transmission, you are very likely to get a high reading when the proper amount of fluid is added. This could potentially lead to the removal of some fluid to lower the level to match the "fill mark". Does this make sense to anyone?

Hurth model 50

If you do a search on "hurth" there are two pages worth, i.e. a manageable number of threads to read.
Like these:
http://www.ericsonyachts.org/infoex...8-Oil-Level-Checking-Woes-Hurth&referrerid=28

http://www.ericsonyachts.org/infoex...03-Synthetic-Transmission-fluid&referrerid=28

And, there are others....

Note: the trans. holds 10 oz of ATF fluid. :nerd:

Cheers,
Loren

I have wondered the same thing about the angle of the transmission. I think it also makes it difficult to get all the fluid out if you have to remove it from the dipstick hole with a pump. I still have the removed fluid in the pump from the change I did last weekend and planned to measure it.

mherrcat said:

I have wondered the same thing about the angle of the transmission. I think it also makes it difficult to get all the fluid out if you have to remove it from the dipstick hole with a pump. I still have the removed fluid in the pump from the change I did last weekend and planned to measure it.

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Our boat was just in the yard last week for some prop maintenance. Just for fun we checked the shaft angle and it was about 7 degrees. Not enough to have an effect on fluid readings in that stubby little transmission, IMHO.
I wonder what the actual angle is in an E-32-3?

Loren

Boat Wake said:

I have seen .29 quarts, .44 quarts, and 1.3 pints. Does anyone know for sure?

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My manual (Hurth HBW 50 transmission) shows .37 quarts or .35 liters.

PDX said:

My manual (Hurth HBW 50 transmission) shows .37 quarts or .35 liters.

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That's 11.8 Fluid Oz. Interesting.

Oh well, we all just add until it's at the mark on the dip stick, anyhow.......

The Hurth manual is right, the Universal manual is wrong. Here's how much: http://c34.org/bbs/index.php/topic,5139.msg31528.html#msg31528

I just measured 6.5oz that were in the pump. So there may still be 2 or 3 oz. that I couldn't suck out. So +/- 10 oz. would seem right for the HBW50.

I have never (in three years) had any problems with my transmission, and it definitely looks like the original, so I will continue to fill to the line on the dipstick.

I don't think there is any way you could ever get 1.3 quarts into that transmission...

mherrcat said:

I don't think there is any way you could ever get 1.3 quarts into that transmission...

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For folks who winterize their engines fill the transmission all the way up.