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  70 yamaha will trim up not down

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Author Topic:   70 yamaha will trim up not down
wayne baker posted 08-02-2003 07:00 PM ET (US)   Profile for wayne baker   Send Email to wayne baker  
I am looking at a 70 hp yamaha that has a trim problem. The trim motor runs but the motor will not trim down. The tilt cylinder works fine both up and down. when the motor gets to the trim cylinders it stops but the motor is running. I can bleed the cylinders off at the bypass and the motor glides to the down position. The motor will trim up fine but will not trim back down. there is no rust on the pins to keep them from retracting. Any thoughts on what could cause the problem?


Steve Leone posted 08-03-2003 01:42 AM ET (US)     Profile for Steve Leone  Send Email to Steve Leone     
Sometimes it takes a few minutes for them to "catch up" with the fluid. Otherwise you may have a bad check valve inside the unit itself. Steve
wayne baker posted 08-03-2003 05:37 AM ET (US)     Profile for wayne baker  Send Email to wayne baker     
Steve I have given it plenty of time to catch up. I was hopeing the bleed it off to the lowest point and triming it up would free something up ,it has not. Is a check valve in the unit a professional repair job, or is there something I can do?
Clark Roberts posted 08-03-2003 06:09 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Wayne, if the electrical checks out (motor runs and up and down solenoids work) try the following: Add an oz or two of "automatic transmission fluid conditioner" (avail at local auto store) and move engine up and down using electrical and also manual (open the emer. bypass valve). Do this as much as your energy will permit to circulate the conditioner through the hydraulic system passages. This may unstick a valve which may be causing the problem and is worth a try... happy Whalin'.. Clark... Spruce Creek Navy
wayne baker posted 08-03-2003 07:15 PM ET (US)     Profile for wayne baker  Send Email to wayne baker     
Sounds like a good idea, I will try it, thanks Clark.
wayne baker posted 08-04-2003 10:36 AM ET (US)     Profile for wayne baker  Send Email to wayne baker     
Today I again started to bleed the motor down and trim it up in hopes of freeing up something on the trim down side. Today I had my son in the boat running the trim for me. I thought I would try running the pump down and opening the bleed slowly to see if it would help the flow problem. The motor began to trim down. I Can not close the bleed off completly yet but is is closed to the point the motor does not leak down. I hope after I run the motor up and down a bit more I will be able to close the bleed off tight.
Steve Leone posted 08-04-2003 12:45 PM ET (US)     Profile for Steve Leone  Send Email to Steve Leone     
Wayne, if you follow Clark`s advice make sure you drain the conditioner out of the unit after it has freed (if it does). Alot of those conditioners will soften and swell seals and o-rings. I remember years ago a mechanic using brake fluid to stop the leak in his lower unit. It worked for about 2 months and then just went to pot. Steve
wayne baker posted 08-04-2003 01:11 PM ET (US)     Profile for wayne baker  Send Email to wayne baker     
I dont think I am going to put anything in it right now. I have it triming and tilting both up and down with the bleed slightly cracked. I think I am going to leave it like this for a while and see if later I can pinch back on the bleed.

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