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Posting a reply to: Re: 40 hp Mercury - lower unit "vent" ports

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71mercman

Posted 4/14/2015 6:40 AM (#764788 - in reply to #764573)
Subject: Re: 40 hp Mercury - lower unit "vent" ports

Location: Altoona IA

I've only seen it on a few models. One reason is it's in case you can not get the motor in a perfectly vertical position... Re Merc- With the outboard in the vertical position, add lubricant until it appears in the front vent hole and install the plug with sealing washer. Continue adding lubricant until it appears in the rear vent hole. Stop adding lube and install the rear vent plug and sealing washer before removing the fill tube. Remove tube and replace the fill plug and sealing washer. I have not had a 40 gearcase apart but I have seen where if you fill certain LU's too fast, oil will come out of the vent before actually reaching proper level due to casting cavities.