Corrosion trim & tilt

K

kmdneptune

Recruit
Joined
Aug 7, 2005
Messages
5
:confused: <br /><br />My recently replaced trim and tilt is corroding again in the same spot. On the side of the piston the MFGer used a stainless insert to seal a hole. The aluminum around the insert is corroding. This is the second time. I replaced it last yr 8/04.<br /><br />What’s happening?<br />How do I stop this?<br /><br />Note:<br />My zincs are perfect no electrolysis at all.<br />No other corrosion anywhere on the engine.<br />Corrosion is above the water line.
 
E

ezeke

Supreme Mariner
Joined
Sep 19, 2003
Messages
12,532
Re: Corrosion trim & tilt

The zincs really should not be perfect. I'd pull them and make sure the mounting bolts are making good contact. A lot of corrosion is not visible until you start pulling cylinder heads and such and find the bolts locked.
 
K

kmdneptune

Recruit
Joined
Aug 7, 2005
Messages
5
Re: Corrosion trim & tilt

I checked the grounding from the zinc to all parts of the engine including the trim and tilt. I have continutiy everywhere.<br /><br />Now what??
 
W

walleyehed

Admiral
Joined
Jun 29, 2003
Messages
6,767
Re: Corrosion trim & tilt

Let's start again...what engine do you have..yr and model???<br />The piston is INSIDE the cylinder with an oring for a seal...are you refering to the cylinder body?? perhaps where the line-clamp holds the SS line at the top of the cylinder??
 
K

kmdneptune

Recruit
Joined
Aug 7, 2005
Messages
5
Re: Corrosion trim & tilt

Let me be a little clearer:<br /><br />I have a Johnson Oceanrunner 175 HP 1996<br /><br />The trim and tilt piston housing corroded and I replaced it 8/2004. I just noticed the same spot is corroding again. It’s where the MFG used a Stainless insert to plug a hole in the side of the trim and tilt housing/block. I checked the ground to the Zinc and it’s good for the entire motor and tilt, even where the corrosions takes place
 
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