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Author Topic:   Yamaha 150 Trim and Tilt Leaking Fluid

Graybay posted 08-06-2015 04:27 PM ET (US)
There is a recurring leak [of fluid] in my Yamaha 150-HP outboard engine's trim and tilt, not from the ram seals and not from the manual relief valve screw. A guy at the marina said [the source of the leak of fluid] could be from the check valves. He said [the check valves in the trim and tilt actuator] were on the back of the unit (meaning toward the transom). [Solicits readers to give advice and to] clarify what [the guy at the marina] means. I did not get to question him at the time. Thanks as always.
jimh posted 08-06-2015 05:38 PM ET (US)
Can you mention the model year and model designator of your Yamaha engine. That information might be useful to someone trying to assess the particulars of the trim and tilt unit on your particular engine.
jimh posted 08-06-2015 05:46 PM ET (US)
If you plan to perform a repair on the hydraulic trim and tilt actuator yourself, I recommend getting a copy of the factory service manual for your engine. Typically in the factory service manual there will be detailed information on the configuration of the hydraulic system, the location of the valves that operate the system, and procedures for disassembly and repair.
The difficulty of repair of the hydraulic actuator of an outboard engine trim and tilt system seems to me to be high, and often some specialized tools are necessary. Alternatives to self repair of the unit may be:
--have a shop repair it
--buy a used unit from a motor that has power head damage and is being sold for parts
--buy a new unit and sell the old one for parts
It seems common these days that many manufacturers are using the same OEM for the trim tilt actuator. The SHOWA brand of trim tilt actuators seems to be a popular brand.
Graybay posted 08-06-2015 08:53 PM ET (US)
The engine in question is a Yamaha F150TXR. Manufacture date 06/05. I would not do T/T work myself. I really was just trying to understand where this mysterious leakage could be coming from. Hoping I can crutch thru the season and affect the repair in the fall.
contender posted 08-06-2015 11:33 PM ET (US)
1st if the fluid is leaking you should be able to find where it is leaking from....I do not know of a check valve in the trim and tilt system, And if there was were would it be located and for what reason? Fluid in the trim system is on both sides of the cylinder, the pump flows fluid one way for up and one way for down. There are mult. o rings on the trim piston and a seal at the top of the piston, and the same with the tilt piston. There is a relief valve at the bottom of the tilt cylinder, but this is just another o ring. I can only think of a couple of places your unit is leaking from, the seal on top of the pistons, the release screw. Unless something is cracked

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Author	Topic: Yamaha 150 Trim and Tilt Leaking Fluid
Graybay	posted 08-06-2015 04:27 PM ET (US) There is a recurring leak [of fluid] in my Yamaha 150-HP outboard engine's trim and tilt, not from the ram seals and not from the manual relief valve screw. A guy at the marina said [the source of the leak of fluid] could be from the check valves. He said [the check valves in the trim and tilt actuator] were on the back of the unit (meaning toward the transom). [Solicits readers to give advice and to] clarify what [the guy at the marina] means. I did not get to question him at the time. Thanks as always.
jimh	posted 08-06-2015 05:38 PM ET (US) Can you mention the model year and model designator of your Yamaha engine. That information might be useful to someone trying to assess the particulars of the trim and tilt unit on your particular engine.
jimh	posted 08-06-2015 05:46 PM ET (US) If you plan to perform a repair on the hydraulic trim and tilt actuator yourself, I recommend getting a copy of the factory service manual for your engine. Typically in the factory service manual there will be detailed information on the configuration of the hydraulic system, the location of the valves that operate the system, and procedures for disassembly and repair. The difficulty of repair of the hydraulic actuator of an outboard engine trim and tilt system seems to me to be high, and often some specialized tools are necessary. Alternatives to self repair of the unit may be: --have a shop repair it --buy a used unit from a motor that has power head damage and is being sold for parts --buy a new unit and sell the old one for parts It seems common these days that many manufacturers are using the same OEM for the trim tilt actuator. The SHOWA brand of trim tilt actuators seems to be a popular brand.
Graybay	posted 08-06-2015 08:53 PM ET (US) The engine in question is a Yamaha F150TXR. Manufacture date 06/05. I would not do T/T work myself. I really was just trying to understand where this mysterious leakage could be coming from. Hoping I can crutch thru the season and affect the repair in the fall.
contender	posted 08-06-2015 11:33 PM ET (US) 1st if the fluid is leaking you should be able to find where it is leaking from....I do not know of a check valve in the trim and tilt system, And if there was were would it be located and for what reason? Fluid in the trim system is on both sides of the cylinder, the pump flows fluid one way for up and one way for down. There are mult. o rings on the trim piston and a seal at the top of the piston, and the same with the tilt piston. There is a relief valve at the bottom of the tilt cylinder, but this is just another o ring. I can only think of a couple of places your unit is leaking from, the seal on top of the pistons, the release screw. Unless something is cracked