Manual tilt, tilt cylinder fluid - what type is it?

[driver440]

I need to replace the fluid that was in my manual tilt, tilt cylinder (evinrude 70hp). On advice from my local outboard specialist I replaced it with hydraulic jack oil but this is very 'thin' oil and it has a minimal, if any, damping effect when I lower the leg of the outboard. <br /><br />There is no info on this in my clymer manual so I would really appreciate it if someone could tell me what oil should be in that tilt cylinder/shock absorber.<br /><br />Thanks, Dave

 

[DHPMARINE]

Re: Manual tilt, tilt cylinder fluid - what type is it?

Have you talked to your specialist again ?I didn't know these units were refillable.Any oil would be good,how did you add it ?<br /><br />DHP<br /><br /><br />don't let the smoke leak out

 

[driver440]

Re: Manual tilt, tilt cylinder fluid - what type is it?

I refilled it by removing the cap on the top of the tilt cylinder (35mm pin spanner). I was unable to remove the cylinder so the existing fluid was removed as best I could but there was probably a residue trapped at the very bottom under the piston.<br /><br />The fluid that was already in there was grey in colour and quite thick and emulsified. The jack oil, in contrast, is very light and fluid. I think it is too light and doesn't produce the right resistance going through the holes in the piston/ram. <br /><br />I think you are right in that this is not a normally serviceable item but I was trying to pin down problems in the tilt mechanism and had thought the piston was jamming in the cylinder.<br /><br />My local specialist has about as much knowledge on this as I do, ie minimal, so I don't think it is worth going back again.<br /><br />I was hoping someone on the forum would be able to advise me.