Fully drain and replace trim/tilt hydraulic fluid on 1992 Cobra Sterndrive

[skiscotty]

I have just finished a complete rebuild of my 1992 Cobra sterndrive [model 584APRAMH].

I want to totally empty out the old trim/tilt fluid and replace with 100% new ATF dextron III fluid. My OMC workshop manual gives the procedure to top-up and bleed but does not tell me how to completely drain out old fluid.

Tilt Rams are removed at the moment.

Anyone know how to drain the system fully without damaging the trim pump - I don't want to run it dry??

Thanks, John

 

[Bondo]

Re: Fully drain and replace trim/tilt hydraulic fluid on 1992 Cobra Sterndrive

I have just finished a complete rebuild of my 1992 Cobra sterndrive [model 584APRAMH].

I want to totally empty out the old trim/tilt fluid and replace with 100% new ATF dextron III fluid. My OMC workshop manual gives the procedure to top-up and bleed but does not tell me how to completely drain out old fluid.

Tilt Rams are removed at the moment.

Anyone know how to drain the system fully without damaging the trim pump - I don't want to run it dry??

Thanks, John

Ayuh,... Take it out, 'n tip it Upside-down...

 

[Levinz11]

Re: Fully drain and replace trim/tilt hydraulic fluid on 1992 Cobra Sterndrive

ayuh,... Take it out, 'n tip it upside-down...

lol!

 

[skiscotty]

Re: Fully drain and replace trim/tilt hydraulic fluid on 1992 Cobra Sterndrive

Thanks Folks,

Amazing answer - and there was me thinking someone might have an intelligent suggestion about how to drain it without removal.

cheers.

 

[Howard Sterndrive]

Re: Fully drain and replace trim/tilt hydraulic fluid on 1992 Cobra Sterndrive

you don't remove all the oil from any hydraulic system - just change what's in the reservoir frequently and the oil will be renewed eventually

 

[skiscotty]

Re: Fully drain and replace trim/tilt hydraulic fluid on 1992 Cobra Sterndrive

Thanks to everyone who responded, I ultimately pulled the trim pump out and turned it upside down to get all the fluid out. it was full of crap as I expected. Unfortunately, this boat has not been 'loved' in the past and I thought complete fluid replacement was the best bet. I agree with Howard Sterndrive that going forward it can have regular top-ups which should mean it wont need a full replacement again.

cheers and safe boating to all.

 

[Bondo]

Re: Fully drain and replace trim/tilt hydraulic fluid on 1992 Cobra Sterndrive

Thanks to everyone who responded, I ultimately pulled the trim pump out and turned it upside down to get all the fluid out. it was full of crap as I expected. Unfortunately, this boat has not been 'loved' in the past and I thought complete fluid replacement was the best bet. I agree with Howard Sterndrive that going forward it can have regular top-ups which should mean it wont need a full replacement again.

cheers and safe boating to all.

Ayuh,.... Yer Welcome....