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  89 Merc devleops will of its own

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Author Topic:   89 Merc devleops will of its own
Denny posted 05-03-2002 01:20 AM ET (US)   Profile for Denny   Send Email to Denny  
Iíve got a 89 Merc 100 hp trim and tilt that has started to intermittently stop working. It will work fine then, it will not come up. Then it will work again. I donít know if this is related but when the Whaler is parked for a few days the motor will slowly lower to the vertical position. The travel is about 8 inches. Any one have any ideas on what is going on and what I should do?.
A new Johnson is out of the question, though not out of the dreams.


EddieS posted 05-03-2002 01:58 AM ET (US)     Profile for EddieS  Send Email to EddieS     

First thing I would do is check the hydraulic fluid level. Top it off if necessary and then go through the procedure for bleeding the air out of the system. This can take a while to work out. I am assuming that you can always hear the pump run, the motor dropping 8" would indicate air in the system or a leak in the system to me.


PMUCCIOLO posted 05-03-2002 04:41 AM ET (US)     Profile for PMUCCIOLO    

I do not profess to be an expert, but, when fishing with a friend of mine with a 115 Merc powere boat, a similar problem developed with the TNT working intermittently. Don't ask me what the part is, where it is, or how to fix it, but it, per the mechanic, was the "brushes" on the tilt motor making faulty contact.

Again, unfamiliar with Merc's, the OMC engines I've owned had a manual release on the motor bracket (it looked like a screw head from the side of the bracket) which allowed one to tilt the engine manually. Perhaps your tilt and trim mechanism contains a similar release. If the screw is not tightened down all the way, the motor will sink down a bit from a tilted position.

I hope that this helps.


Clark Roberts posted 05-03-2002 07:08 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Denny, see my response under "repairs/mods".. Clark
Denny posted 05-03-2002 10:37 AM ET (US)     Profile for Denny  Send Email to Denny     
Thanks for the information. This gives me a couple of things to start checking on.


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