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Posting a reply to: Re: Winterizing Merc Optimax

Muskie Fishing -> Muskie Boats and Motors

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Shack Attack

Posted 11/11/2010 3:42 PM (#466394 - in reply to #466370)
Subject: Re: Winterizing Merc Optimax

Posts: 164

It can be a pain to change all the plugs, but by removing the bottom cowling makes it very easy. I have changes plugs leaving the cowling on and it can be done. Read this link on how this guy changes the plugs http://www.thehulltruth.com/boating-forum/180751-optimax-spark-plug...

The thing you really need to watch for is cross threading the heads. I had a problem with the spark plug socket hitting and a head bolt (top left hand plug). This meant that I could not get the socket straight when I went to reinstall the new plug. If the head bolt had been turned by a tiny bit, the socket would have cleared the edge of the bolt. So I had to grind the socket thinner to clear it.

I was told by the mechanic at Cabalas that Mercury now recommends leaving the plugs in and crank the engine with the oil pump only turned on, when connected to a lap top. This pumps the oil into the cylinders for lubrication.

It’s cheaper to pay a mercury dealer to do it right than either screw the plug threads of have rusty cylinders. If you don’t have the confidence to tackle the plugs yourself.