175hp BlackMax tilt cylinder leaks down

[Jimfishes]

I have a1987 175hp mercury BlackMax. The tilt cylinder leaks down, no external leaks. Could it be more than just cylinder packing?

 

[faztbullet]

3 ram or single ram?

 

[Jimfishes]

It is a 3 ram unit

 

[mechanicman]

Inside the pump are 2 poppet valves. Both are replaceable. They hold the pressure for up and down.

 

[faztbullet]

Trash under impact valve in tilt cylinder and damaged o-ring/valve on manual release will cause this.

 

[Jimfishes]

Inside the pump are 2 poppet valves Both are replaceable. They hold the pressure for up and down.

 

[Jimfishes]

Thanks, I’ll see if I can find a rebuild kit and reseal the 3 cylinders, replace the 2 poppets and orings.

 

[Jimfishes]

Trash under impact valve in tilt cylinder and damaged o-ring/valve on manual release will cause this.

I backed off the manual release 1 turn the retighten. It’s only the tilt cylinder that leaks down. I have to pull the whole assembly so I go ahead and reseal everything. Thanks for your input.

 

[Jimfishes]

I checked with 5 Star Marine, they don’t sell a rebuild kid or individual parts for this tilt/trim unit. They will rebuild this one. Besides cost I don’t want to be down that long. Do you guys know of any other hydraulic shops that might have a kit/parts. Thanks

 

[Jimfishes]

Trash under impact valve in tilt cylinder and damaged o-ring/valve on manual release will cause this.

Not familiar with the impact valve. Is it external or inside the tilt cylinder?

 

[faztbullet]

Inside the cylinder attached to the rod

 

[Jimfishes]

Inside the cylinder attached to the rod

thanks

 

[Jimfishes]

Do you happen to know of somewhere I can find the poppets ? I think I can match prongs and packing here local. Thanks again.

 

[faztbullet]

The tilt repair kit is 25-41478A1, it has all the nylon and o-rings. To my knowledge Merc has never offered repair parts for pump.

 

[Jimfishes]

Thanks, 5 Star Marine won’t sell a kit, or single parts, for this unit, I’ll see if my local Merc shop can order it.