Re: Who knows the 485 alum block?
Posted on another site by another user:<br /><br />Flushing trim fluid<br />--------------------------------------------------------------------------------<br />originally posted by Iggy<br />Man-O-man, are you in for a fun time. <br />I had a cylinder hose leak that allowed water into the system this spring. Flushing the system took me about 3 hours. <br /><br />What you have to do is this: <br />1) pick up about 4 quarts of the proper fluid for your system and a gallon of mineral spirits. Stop at a home center and pick up two bolts, 3/8-24 (I think) by 1in long. Rig up a two way switch and attach it to the pump solenoids, so you can run the trim system from the ground, unless you're lucky enough to have a transom switch or else you'll need a helper to man the switch from the cockpit. <br /><br />2) remove as much of the contaminated fluid from the reservoir as possible. <br /><br />3) refill reservoir with a 25/75 mix of oil and mineral spirits (oil-25, spirits-75). Don't attempt to run straight solvent, pump will seize. I almost did that to mine. <br /><br />4) starting with the drive all the way down, disconnect the two hydraulic lines that feed the far (aft end or trim in/down) end of the trim cylinders from the base of the drive system and install the two bolts finger tight. These bolts stop air from entering the system from the disconneced lines when you run the pump. <br /><br />5) hold the two disconnected hoses over a drain pan and trim the drive all the way up, trailer height. The fluid should be forced out the hoses that you are holding. <br /><br />6) when the drive is all the way up, stop, remove the two bolts, reconnect the two hoses, disconnect the other two, install the two bolts in those holes and run the trim all the way down, holding the hoses over the pan. <br /><br />DON'T FORGET TO CHECK THE OIL LEVEL! <br />Refill with 25/75 mix. <br /><br />7) repeate this process until you flush out all the milky oil. <br /><br />WATCH YOUR OIL LEVEL! <br /><br />8) remove what oil and solvent you can from the reservoir and refill with straight oil and flush the cylinders as before until you are sure you have flushed out as much of the solvent as possible. <br /><br />WATCH YOUR OIL LEVEL! <br /><br />Check for leaks and you should be done. If you managed to get some air in the system, don't worry, it will bleed itself out. <br />I know it's messy, but this is the best way I could see to do it. I'll be damned if I'll pay someone to do this. <br />If someone else has a better idea, pass it on.
