1975 Mercruiser Tilt/trim issue

[rogerrabbitis]

Hi so end of last season my tilt / trim system was pretty much out of fluid I seem to have a leak I can't find it seems to be in the boat not outside as I don't see any oil in the water but this year we failed up the system and we can get it to go up but not down we have tired to purge the system but still having the same issue I think there is still an air lock but not sure how to get rid of it any ideas ? also options to find the leak I was thinking of dye in the system to help find where it may be leaking from ?

 

[Scott06]

Hi so end of last season my tilt / trim system was pretty much out of fluid I seem to have a leak I can't find it seems to be in the boat not outside as I don't see any oil in the water but this year we failed up the system and we can get it to go up but not down we have tired to purge the system but still having the same issue I think there is still an air lock but not sure how to get rid of it any ideas ? also options to find the leak I was thinking of dye in the system to help find where it may be leaking from ?

Yes for leak detection UV dyes can be a life saver. I got a cheap UV light off amazon and different dyes for AF and Oil, found some leaks more easily than I would have, but you have to clean it all up with brake fluid firts.

I would stand on the drive or disconnect the trim rams to see if its a hydraulic issue or a drive is tuck issue. Lilky crud in the seals