Where did I goof with tilt/trim?

J

jasonnb

Petty Officer 2nd Class
Joined
Nov 8, 2001
Messages
171
I just rebuilt one of the trim cylinders on my '76 888 Mercruiser 1 drive. It had gotten some corrosion under one of the seals in the brass slide and didn't work properly. Now that I have rebuilt it and replaced the seals. Now my drive goes up great, but getting it to trim down is another story. It will try and slowly creep down, but it would take 15 minutes to get there. I can put some weight on the drive and it goes down ok. I can crack the up line on that cylinder and it lowers ok. What did I miss? It seems to work ok on the workbench operating it by hand in a bucket of oil, but it doesn't seem as springy as the other one. There are no visible leaks.
 
W

Wellcraft 89

Petty Officer 2nd Class
Joined
Aug 5, 2002
Messages
158
Re: Where did I goof with tilt/trim?

Sounds like air in the system,you'll have to bleed it.<br />make sure you have extra fluid for the resovoir.<br />have someone run the trim up,crack the line that feeds the cylinder up bleed air out,tighten line.<br />do both cylinders on the up stroke,first,then the down line on both sides.then run it up and down quite afew times..<br /><br />rich
 
O

ODDD1

Lieutenant Junior Grade
Joined
Jan 23, 2001
Messages
1,054
Re: Where did I goof with tilt/trim?

Jason, you are passing oil between the upside of the cylinder and the down side [an internal leak] your description of failure is a classic, more than likely a shredded o ring on the adaptor on the forward end of the internal tube, or a bad check ball in the shock piston...time to take it apart again...
 
W

Wellcraft 89

Petty Officer 2nd Class
Joined
Aug 5, 2002
Messages
158
Re: Where did I goof with tilt/trim?

Sorry jason I didn't read your post all the way before responding.<br />oDDD1 is correct <br /><br />Rich
 
J

jasonnb

Petty Officer 2nd Class
Joined
Nov 8, 2001
Messages
171
Re: Where did I goof with tilt/trim?

Bings. Re-did the seals in the "good" cylinder and the problem is solved. One other question though. Anyone have any idea why, when I try to trim up, the motor looses a dramatic number of RPM's? It will kill the motor when idling.
 
J

johnkc

Petty Officer 1st Class
Joined
Dec 12, 2001
Messages
388
Re: Where did I goof with tilt/trim?

check the ground connection of the pump ,it should be on a bolt on the flywheel hsg.preferably by itself.
 
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