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Old 10-10-2014, 10:12 PM   #21
Join Date: Dec 2012
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Thanks!! Can't wait to see what comes out!!!!

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Old 10-12-2014, 04:03 PM   #22
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City: UMR MM283
Country: US
Vessel Name: Northern Lights II
Vessel Model: Bayliner 3870
Join Date: Jan 2013
Posts: 1,140
Originally Posted by traderjohn View Post
I have Volvo MS3 gear box. Does anyone know if it has an oil drain plug or is it a pump out?

I had the volvo MS3 gears in my last boat, it's been awhile so this may be wrong but I believe they had a drain on the side of the case.
My Hurth HBW-450s hold 1.9 quarts I change between 100 to 120 hours and use full synthetic.

Ron on Northern Lights II
I don't like making plans for the day because the word "premeditated" gets thrown around in the courtroom.
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Old 10-13-2014, 07:11 AM   #23
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City: Maryland
Country: USA
Vessel Model: 42' Sportfish
Join Date: Aug 2013
Posts: 2,105
Originally Posted by dwhatty View Post
Change it every 100 hours or annually on our new boat's ZF tranny that uses 30w engine oil, per the manual.


We also have a magnetic filter on our gears; I've checked that, and it's always as clean as the oil.

South River, Chesapeake Bay
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Old 10-13-2014, 08:42 AM   #24
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City: Oslo
Country: Norway
Vessel Name: Southern Promise MMSI 258170360
Vessel Model: Ocean Alexander 55 Mk1
Join Date: Jul 2008
Posts: 105
The output flange on my port engine broke loose as the center bolt give in of metal fatigue stress (misaligned shaft). When the flange was pulled out all oil in the gearbox emptied itself into the bilge. This happened on our way into a narrow tidal lock in Holland. Ouch! This was on the 1800 nm get-home run from southern Portugal to Scandinavia with our to us new boat.

Look at that color! This is supposedly straight 30 weight oil.

At the time the gearboxes had 1.000 hrs/15yrs on them. Could be the oil was never changed since they were installed?

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Sourced a new bolt from a nearby yard, installed the flange, stretched the new bolt to the specified torque (we do not go on a cruise without a torque wrench, do we?) and filled NEW oil. We were on our way again after a 2 day delay. No trouble since.

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Old 10-13-2014, 04:45 PM   #25
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City: Brisbane River
Country: Australia
Vessel Name: Insequent
Vessel Model: Ocean Alexander 50 Mk I
Join Date: Mar 2012
Posts: 910
Before rebuild my gear oil looked like that too. I have no idea the hours since the PO had changed the gearbox oil. I assume you fixed the shaft alignment when replacing the bolt? What engines and gearbox do you have in the Mk 1?

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