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Author Topic:   Yamaha Tilt Diagnosis and Repair
Sal A posted 08-26-2009 02:56 PM ET (US)   Profile for Sal A   Send Email to Sal A  
I have a 1994 Yamaha 70. The tilt and trim leaks and it doesn't stay tilted up (especially when out of the water).

Anyone have suggestions for a fix that I can do myself without taking it to a mechanic?

Phil T posted 08-26-2009 03:54 PM ET (US)     Profile for Phil T  Send Email to Phil T     
Get yourself a shop manual.

Have you checked the bypass valve?

Where are the leaks coming from?

Have you seen the online parts diagrams and list @ . Just plug in Outboard, 1994 and select the model. See the diagram and parts list for the tilt and trim.

Tohsgib posted 08-27-2009 10:41 AM ET (US)     Profile for Tohsgib  Send Email to Tohsgib     
Sell it!
jimh posted 08-28-2009 08:15 AM ET (US)     Profile for jimh  Send Email to jimh     
Before taking more drastic measures, first try these:

--check the level of the fluid in the hydraulic system. Generally the owner's manual will provide information on where the filler cap for the trim and tilt hydraulic fluid reservoir is located, how to add fluid, and what type of fluid should be used;

--add the proper fluid if the level in the reservoir is low;

--operate the trim and tilt and move the engine from the fully down position to the fully up position several times; this usually will bleed air from the system. See the owner's manual to determine if the filler cap should be left off or left loose during this bleeding procedure.

--re-check the fluid level in the reservoir. If low, add more fluid. Repeat bleeding procedure.

If the service history of the motor is not known, check the condition of the fluid in the hydraulic system. If the color of the fluid does not correspond to the color of the OEM fluid, this may indicate that the existing fluid has been contaminated or that it was not the proper type specified. If the fluid color is suspicious or non-conforming to the OEM fluid, try to remove as much of the existing fluid as you can, and then re-fill with the proper fluid.

btb posted 08-28-2009 10:48 AM ET (US)     Profile for btb  Send Email to btb     
Its easy enough to replace the seals if you have the right special tool.
Liteamorn posted 08-28-2009 06:16 PM ET (US)     Profile for Liteamorn  Send Email to Liteamorn     
My 1989 Yamaha 150 had the same problem My trailer bracket worked so I just used that.
rtk posted 08-28-2009 07:43 PM ET (US)     Profile for rtk  Send Email to rtk     
Sal- you say the tilt and trim leaks. Where do you see the fluid leaking?

There is a tilt system and a trim system. The large cylinder in the middle of the bracket that is connected to the engine that raises the engine all the way up to trailer position is the tilt hydraulics.

The two small shafts you see when you tilt the engine up d that are not connected to the engine is the trim hydraulics.

If there is a noticeable leak at the base of the shaft(s) of the trim system it is a relatively easy fix to replace the seals. As long as the caps come off easy it is a 1 hour repair job to replace the seals and dust caps and around $30 in parts shipped via 2 day. I did this repair on my buddy's 115 Yamaha a couple of months ago. Andy from Shipyard Island Marina (SIM) gave me instructions on how to do it. They have a loaner tool program for parts customers so he sent me the special tools needed to remove the caps. I cannot say enough about how helpful they were. What a fantastic resource for Yamaha customers.

Any business that sends you $350 dollars worth of special tools with no deposit for a $30 parts order is OK in my book.

A local Yamaha dealer wanted $350 to replace the seals. Sold my buddy $100 dollars in parts for the fix. Buddie offered to rent the tool from the guy and was told no way. Needless to say he will not get a dollar from me in the future.

The tilt system seals gets a bit more complex. From what I was told to replace those seals you have to disassemble a fair amount of the tilt/trim assembly and it is a labor intensive process.

If you happen to be down with the boat I do have a manual for the engine. I'd be happy to stop over with it and see what we can come up with over a few cold ones.


Sal A posted 08-29-2009 05:43 PM ET (US)     Profile for Sal A  Send Email to Sal A     

She needed a little bit of fluid, and the release valve was a little loose. That's all it was. I AM LUCKY. I took the boat down today and dropped her in again. My renters are out, and my place is spic and span. Late September how about we met up on a Saturday afternoon for those beers?

rtk posted 08-29-2009 06:08 PM ET (US)     Profile for rtk  Send Email to rtk     
Good deal Sal. It is always nice when it is something simple.

End of September sounds good- keep in touch.


eoraviation posted 04-17-2010 10:25 AM ET (US)     Profile for eoraviation  Send Email to eoraviation     
I have a 1995 Yamaha C85. The scraper seal on the tilt actuator is coming out. The manual doesn't show this part as replaceable. It looks like the entire shaft assembly needs replacement at around $450. Does anyone repair this? Does the shaft assembly disassemble enough to slide on a new seal?

I haven't removed the cylinder yet, [and I am] checking my options before I get started. I have rebuilt many hydraulic actuators on airplanes and can't believe I have to [vulgar colloquial for "discard'] a perfectly good actuator shaft assembly for a 25-cent seal. [Give] your advice.

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