Trim issues please advise 1985 Merc 5.0l 200/898

[yamxtc600]

Engine is a 1985 Mercruiser 5.0l (305) 200hp with less than 200 total hours on it. <br /><br />It has not been in much use over the last few years and was winterized 5 years ago and just brough back into service this year.<br /><br />When the boat is on the trailer the trim/tilt mechanism works fine, but once in the water it begins to "act up". Like after being on plane then slowing back down the trim/tilt does not wan to work. It takes several minutes of fiddling with the switches before they will work again.<br /><br />I have checked all of the connections and wires leading to the trim cylinder, they all appear to tbe okay and the oil level in the cyl. is at spec.<br />ANY IDEAS? This one is quite annoying and really spoiling an otherwise good boat.

 

[Don S]

Re: Trim issues please advise 1985 Merc 5.0l 200/898

Here is a link to the Mercruiser service manual. If you look in section 1-C (Troubleshooting) there are wiring diagrams and test procedures for tracking down your problem.<br /><br /> http://www.boatfix.com/merc/Servmanl/6/6covr3.pdf <br /><br />You may have to run your curser over the pages to locate different links, they aren't always obvious.

 

[yamxtc600]

Re: Trim issues please advise 1985 Merc 5.0l 200/898

Thanks, Don. I had thought of replacing the pump unit as the lines and the cylinders look fine. That might be drastic, but I will start with the troubleshooting section.

 

[yamxtc600]

Re: Trim issues please advise 1985 Merc 5.0l 200/898

Don S. do you have another link for that manual. All that one provides me is the Index page.<br /><br />Thanks~~!!!

 

[Wotknot]

Re: Trim issues please advise 1985 Merc 5.0l 200/898

Go to page 7 and run your cursor down the left side under the heading Service Manual Outline