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Old 14 January 2007, 15:06   #1
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Corrosion Inhibitor or something else?

I have just bought a Johnson 90 circa 1996 and when I took the lid off the first thing you notice is that the engine is very clean with no corrosion. There seems to be an oily / waxy deposit all over and I think this is why its in such good shape.

A freind thought this may be some sort of corrosion inhibitor?

Any ideas as to what it is and where I can get more, also how often should it be used?

Chris
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Old 14 January 2007, 15:16   #2
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I personally don't think that a 1996 engine is that old. If its been dry stored and used infrequently then it should look like new. Sounds like you got a decent buy.

As for corrosion inhibitor I don't know. When I'm in the mood for doing some engine maintenance I just use a lightly oiled rag wiped over everything.
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Old 14 January 2007, 15:31   #3
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Any ideas as to what it is and where I can get more, also how often should it be used? Chris
Quicksilver corrosion Guard, good stuff if a little expensive.

http://www.mailspeedmarine.com/Produ...8-0cb0cf4de9e1

Pete
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Old 16 January 2007, 14:47   #4
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Corrosion Block, Boeing's Boeshield T9, CRC Corrosion Inhibitor, LPS #3; there's a ton of them out. You should be able to find a few at your local hardware store, and your Chandlery should stock some of the more marine-directed brands.

I have used Corrosion Block (leaves a thin bluish coating), T9 (leaves a medium weight yellowish waxy coating) and LPS #3 (leaves a heavy, soft wax coating.)

T9 and LPS seem to work better than Corrosion Block, IMO.

Among the hardcore US fishermen, it's pretty common to pull the outboards cowling and spray down the entire interior on some kind of schedule (anywhere from once a year to once a month.) Some say that you should try to avoid any kind of O2 sensor (which strikes me as kind of odd - isn't the sensitive bit in the exhaust stream, and impervious to any kind of external spray?)

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Old 16 January 2007, 16:47   #5
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I think the only one of those that's available over here is corrosion block. I've certainly never seen Boeshield T9 or the others.

I spray my powerhead every time I use the boat. I know it's overkill but it still looks like new.
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Old 16 January 2007, 17:00   #6
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Are there any shops you can buy corrosion inhibitor ?
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Old 17 January 2007, 03:37   #7
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I think the only one of those that's available over here is corrosion block. I've certainly never seen Boeshield T9 or the others.

I spray my powerhead every time I use the boat. I know it's overkill but it still looks like new.

I used to do that with my Yammie and Opti's . It worked well for years and the Yammie engine looked like new for three years until I sold it. I guess there more expensive solutions out there also.

It doesn't matter what product you use but it is definitely good practice to do it.
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Old 17 January 2007, 04:14   #8
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it is quicksilver corrosion inhibiter, about £7 a can, get it from any good chandlery, i use it ,and it superb, on my new trailer, i took the drums aoo and did the brake system,
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Old 17 January 2007, 11:56   #9
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I spray my powerhead every time I use the boat. I know it's overkill but it still looks like new.
Not sure how you equate that to overkill...

That said, I hit mine when I think about it, which works out to about every few months. Seems to work OK for me.

On finding brands and such, a web search for "corrosion inhibitor spray", "corrosion block spray" or similar should get you a few hits.

This place has T9 http://www.kanza.com/boeshield/B3-UK.html

I'm sure others do, as well, but UK-based websearches don't do much here (unless I'm looking for a US supplier - then all the hits are over there.)

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Old 19 January 2007, 15:51   #10
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I use clear waxoil, messy but does the job well. External corrosion on the powerhead hasn't been a problem on my 1985 engine.
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