89' 200 Johnson trim tab

[Livebaiter]

I bought this engine four years ago. Former owner had painted trim tab. As it is used in SW, I removed the paint. After @100 hours use the trim tab shows no corrosion, but the square zink shows a lot of corrosion. Paint is bubbling in a couple of spots on lower unit. Could this be electrolysis? Aren't all trim tabs supposed to "sacrifice" to protect the lower unit?<br /><br />Livebaiter

 

[clanton]

Re: 89' 200 Johnson trim tab

Not on this engine, you should also insure that the water pickup hole in the trim tab is clear.

 

[ob]

Re: 89' 200 Johnson trim tab

If your zincs are 1/3 or more used up ,you'll need to replace them.There are also optional additional zincs available for your engines lower unit.

 

[Livebaiter]

Re: 89' 200 Johnson trim tab

Thanks for the replies! Just examined the trim tab, and found the water pick-up hole. It was partially blocked. Guess I'll go to the aftermarket manual and search for information on optional zinks. Any ideas for other sources for information on ad-on zinks?<br /><br />livebaiter