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  Chronic Problem on Mercury 30-HP and 35-HP FOURSTROKE with Trim Assembly

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Author Topic:   Chronic Problem on Mercury 30-HP and 35-HP FOURSTROKE with Trim Assembly
Jefecinco posted 08-20-2015 07:44 PM ET (US)   Profile for Jefecinco   Send Email to Jefecinco  
For the past few weeks I've been dealing with a highly corroded lower tilt-trim assembly pin. It's the pin which holds the trim cylinder to the engine mounting bracket or "clamp" as it is referred to in the Mercury on-line parts manual. The pin is made of mild steel which contributes to or perhaps is the cause of the corrosion in salt water. I advise owners of similar engines to inspect the pins on their engines.

I have kept the boat on which this engine is mounted in saltwater for extended periods during the fall and spring for the past three years. When the boat is recovered on the trailer after every salt water use of storage, it gets a good fresh water wash. Regardless of the precautions taken, the pin corrodes and does so quickly. I first noticed the corrosion when removing the trim unit sacrificial anode to replace it. Upon a close visual inspection I saw the pin was corroded to the point that I wanted to replace it.

Following generous applications of PB Blaster my attempts to remove the pin succeeded in the deformation of both ends of the pin. After spending several days of applying more PB Blaster and more banging on the pin, I gave up and sought the help of a trusted marine mechanic. He was able to remove the pin by cutting it in half and pushing it out either side.

I'm now awaiting the parts required to replace the pin: a new pin and five new nylon bushings. The bushings serve the purpose of isolating the pin electrically from the trim unit. I'm also replacing the three sacrificial anodes required on the engine.

When I receive the new pin I intend to have it replicated in 316 stainless steel. While awaiting the stainless pin I'll install the new mild steel pin so we can use the boat. Rest assured I'll carefully lubricate the pin before installation and inspect it carefully after each use.

If you have such a pin on your engine I advise you to remove and inspect it and lubricate it when you reinstall it. Better to take care of the darn thing before it becomes corroded.


jimh posted 08-20-2015 10:16 PM ET (US)     Profile for jimh  Send Email to jimh     
Thanks for the notice of this chronic problem and your suggested solution.

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