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  1987 70 hp evinrude trim and tilt problem

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Author Topic:   1987 70 hp evinrude trim and tilt problem
Mike001 posted 04-07-2004 11:43 PM ET (US)   Profile for Mike001   Send Email to Mike001  
Just picked up my friends new boat last night. I hit the trim down button and lowered the motor about half way. Then for no reason the trim motor started up on it's own and the motor went down all the way.
Now when I hit the trim button up or down there is just a slight click in the relays on the motor and the trim pump will not activate. This happens when I use the switch on the dash and on the side of the motor.

Any sugguestions? the trim motor is only a year old.

Bigshot posted 04-08-2004 12:12 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Probably the relay. You can jump the motor to double check that.
greyg8r posted 04-08-2004 09:42 PM ET (US)     Profile for greyg8r    
I think Big's right. If you have two wires coming off the trim motor, touch each wire to the two terminals of the battery. (Don't worry, it won't spark). The trim or tilt should go up or down. Then, reverse the wires and the tilr or trim should go down. If this happens, replace both relays. I bought them on eBay for $4 each. They just snap in.

If that doesn't work, I think you have a problem with the hydraulics. That should be done by a marine mechanic.


jimh posted 04-09-2004 09:25 AM ET (US)     Profile for jimh  Send Email to jimh     
If the trim motor goes up and the engine goes down, it sound to me like a serious mechanical problem. The link between them must have broken.
greyg8r posted 04-10-2004 11:48 PM ET (US)     Profile for greyg8r    

Hmmmm. I think what Mike meant when he said "...the trim motor started up on it's own..." was that the tilt/trim motor spontaneously started spinning, not that the tilt/trim motor starting raising its piston, which, would indeed be a serious mechanical problem.


Mike001 posted 04-12-2004 05:55 PM ET (US)     Profile for Mike001  Send Email to Mike001     

The motor started up (turned itself on) on it's own and lowered the engine.

I replaced the relays and nothing

I hard wired the motor to the battery and nothing.

I relesed the hydrolic pressure and raised the motor by hand. I the hit the motor with a big screwdriver handle about 5 times and now everything works fine again.

where2 posted 04-18-2004 01:50 AM ET (US)     Profile for where2  Send Email to where2     
"I hit the motor with a big screwdriver handle about 5 times and everything works fine again..."

Sounds like it's time to disassemble that trim motor. you can pick the day to disassemble it, or it will pick the day to stop working... Personally, I choose to hunt my gremlins rather than let them sneak up on me while I'm enjoying a relaxing day on the boat. Stuff that breaks with no warning, that's a different story...

greyg8r posted 04-19-2004 01:19 AM ET (US)     Profile for greyg8r    
As Where says, the motor may work fine now, but I doubt it will be trouble-free from here on. If you are out on the water and tilt up the engine and your t/t motor goes out, you will have to climb out on the engine with a slotted screwdrive and manually release the hydraulic pressure. You don't want to do that.

But, I wouldn't fart around with trying to fix that trim motor. Buy a brand new motor on Ebay for less than $100. Money well spent in your case.

Just my dos centavos,


Whalerdan posted 04-19-2004 01:08 PM ET (US)     Profile for Whalerdan  Send Email to Whalerdan     

Problem is getting the old one off. You may have to take the motor off the boat to get to the back screws. I would probably leave it till it quits completely, but that's the bubba in me. That way you get all your money out of the old one. It's not a safety thing, as you can always use the screw driver.

where2 posted 04-19-2004 11:09 PM ET (US)     Profile for where2  Send Email to where2     
Mike did originally state that the trim motor was "only a year old". So, the screws are probably still relatively easy to remove (if you can get to the back one), and the trim motor is probably in generally decent shape otherwise... Electric DC motors are relatively simple devices. I suspect a bit of spray cleaner as is typically used on RC car motors would fix it right up...

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