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Corrosion Block on 4-stroke Mercury
Ric232	#1  Posted on 04/22/11 - 5:49 PM
Member Posts: 194 Comments: 0 Joined: 05/11/08	I've got some Corrosion Block that I want to spray on my Merc 40 4-stroke (under the cowling). Do I need to be careful not to get any on the belt?
vin197922outrage	#2  Posted on 05/16/11 - 12:56 PM
Member Personal Page Posts: 76 Comments: 4 Joined: 11/30/08	Yes, do not get any on the belts or hose's.
JohnnyCW	#3  Posted on 05/16/11 - 1:06 PM
Member Posts: 684 Comments: 0 Joined: 08/16/09	I've also been warned about getting similar products on wiring. The solvents in the aerosol will eventually soften wiring insulation. A couple of years ago I was at the shop where I used to get my Mercury engines serviced. While talking to the mechanic the topic of using various sprays to protect the engine came up. He gave me a general warning against all of them then walked me over to an engine about 10 years old at the time. All of the engine's wiring insulation was unusually rubbery and could be easily peeled off the wiring. He said it was the result of the owner using a spray silicone product to protect the engine form corrosion. He told me the best best was to open the cowel and lightly spray the engine down with plain fresh water after each use. He said if I was intent on more protection, he recommended food grade silicone lubrication spray. Its used on food production equipment and does not have the solvents that will deteriorate hoses, belts, and wiring insulation.
cummings	#4  Posted on 07/18/11 - 4:12 PM
Member Posts: 50 Comments: 6 Joined: 05/04/11	Boeshield T-9. Used for years on twin inboards. Should not cause the problems noted above under the cowling. I use it on my new 30 Tohatsu .
JohnnyCW	#5  Posted on 07/18/11 - 5:44 PM
Member Posts: 684 Comments: 0 Joined: 08/16/09	Like most similar products, T-9 also contains petroleum distillates which can leach the plasticizers from some materials with continued exposure.
tedious	#6  Posted on 07/19/11 - 4:49 AM
Member Personal Page Posts: 1072 Comments: 2 Joined: 09/07/08	JohnnyCW wrote: He told me the best best was to open the cowel and lightly spray the engine down with plain fresh water after each use. Wow - time to find another mechanic. At least you found out before having him / her service your motor!
JohnnyCW	#7  Posted on 07/19/11 - 6:54 AM
Member Posts: 684 Comments: 0 Joined: 08/16/09	tedious wrote: JohnnyCW wrote: He told me the best best was to open the cowel and lightly spray the engine down with plain fresh water after each use. Wow - time to find another mechanic. At least you found out before having him / her service your motor! Years later I also read the same information in my Etec owner's manual when I purchased it new, go figure. That mechanic has been servicing my Mercury engines for twenty years and he's the best around. Edited by JohnnyCW on 07/19/11 - 6:56 AM
cummings	#8  Posted on 07/20/11 - 5:26 PM
Member Posts: 50 Comments: 6 Joined: 05/04/11	After JohnnyCW posted I sent an email to Boeshield and asked them about the issue of softening of the insulation on the wires. I got a phone call the next day from Tom at the company. Said it is not an issue as the T-9 spray is wax based. Although on the web site they talk about T-9 use in a plastic spray bottle, not to leave it in it, and it is called a solvent he assured that there is no issue. Makes me wonder though. Now, after using it for several years on my twin inboards there never was any degradation in the wiring. When it dries it forms a waxy cover. I also use it on my converted steel to salt water trailer and that conversion is recent and time will tell.
JohnnyCW	#9  Posted on 07/20/11 - 8:42 PM
Member Posts: 684 Comments: 0 Joined: 08/16/09	The MSDS sheet states T-9 contains petroleum distillates. Petroleum distillates can leach the plasticizers from a variety of plastics and rubber materials and thats a fact. I have no doubt some materials are more susceptible than others so issues may vary based on materials and perhaps environmental conditions. I'd just check with your engine's manufacturer to be sure if the product is safe. Its possible the T-9 forumlation may not have enough of the petrolium product or it has other parts of its formulation that help avoid or make the problem less likely. Edited by JohnnyCW on 07/20/11 - 8:46 PM
tedious	#10  Posted on 07/22/11 - 6:53 AM
Member Personal Page Posts: 1072 Comments: 2 Joined: 09/07/08	JohnnyCW wrote: tedious wrote: JohnnyCW wrote: He told me the best best was to open the cowel and lightly spray the engine down with plain fresh water after each use. Wow - time to find another mechanic. At least you found out before having him / her service your motor! Years later I also read the same information in my Etec owner's manual when I purchased it new, go figure. That mechanic has been servicing my Mercury engines for twenty years and he's the best around. Johnny, where did you see that in the manual? I don't have an eTec, but I looked through the online version of the 2012 manual for the inline eTecs and I could not find any such thing. Tim
JohnnyCW	#11  Posted on 07/22/11 - 9:24 AM
Member Posts: 684 Comments: 0 Joined: 08/16/09	My 2010 packet had several loose yellow addendum pages mostly concerning the NMEA network connections, engine oil, and flushing/cleaning the engine. I'll check those. I cannot find any information regarding the subject in the actual manual either. I may very well be mistaken and simply assimilated what I was told by the dealer that rigged the engine. I know its also warned against from the Evinrude factory certified mechanics that participate on the Etec owners group forum. Regardless I don't used solvents on the engine components under my cowl and haven't for many years. Its not necessary. I do however use a food grade silicone spray that does not contain petroleum distillates a couple times a year. Edited by JohnnyCW on 07/22/11 - 9:46 AM
JohnnyCW	#12  Posted on 07/22/11 - 10:50 AM
Member Posts: 684 Comments: 0 Joined: 08/16/09	I did find mention ant-corrosion spray in my owners manual but its not very specific. My owners manual states to use only Evinrude anti-corrosion spray but its maintenance for exterior parts under general engine maintenance. Nothing about under the cowl. I did find this about the Boeshield T-9 in regard to applying their product that comes by the gallon... I just purchased a gallon of T-9® to protect my boat and trailer in Florida (salt water). What is the best way to apply it out of the gallon? I started using your product to protect the fire axes on my department. The easiest way to spray it is using a “Windex” type bottle, or other pump sprayer. Keep in mind that Boeshield T-9® is solvent based and most of these pumps will not last for long. We suggest filling such containers with only what you need for each use, and put back what’s left over. It has enough petroleum solvents to ruin plastic pump sprayers. What might it do to the plastics and rubber components of an engine with long term exposure? But then don't worry, a representative from the company said its fine...? No thank you, there are other alternatives.