mariner 40 power trim

[kev]

When I trim the engine up, under way, it only goes up so far,but when on trailer will go all the way up, also them trying to trim up when moving slowly wont trim up until I slow right down , has any came across this problem.

thanks
Kev

[uncle al]

trim fully upand check the oil level and maybe bleed the system

[Turbodiesel]

I thought that was normal. The trim system has a pressure valve in it, so over certain revs, (pressure) it will trim it down to 12 degres? or it wont let you trim up over a certain angle. Something along those lines?

[9D280]

Having recently stripped one of it's cousins, I think that TD is right - there's a pressure relief valve, older ones had it built in to rhe piston ,newer is in the manifold under the motor) I think to stop you lifiting it clear of the water when under power.

The properly old Merc/Mar systems had a switch to stop it being motored all the way up unless in neutral. It cut the power to the motor before the swivel bracket "escaped" from between the clamp brackets, I think primarily to stop you conrnering uneder power & bending the tilt tube. (you could do that & still keep the water inlet under the surface)

Does it meander back down on it's own? That would hint there's air in the system.

[kev]

Thanks , I have checked oil level and its ok, It does not drop back down ,possible its as TD said ,its just the old yam 40 s I had on the 5.4 searider could be trimed right up.

Thanks anyway for info.