Just bought a 21' Renken with a 3.7 Merc I/O. Problem is that the outdrive tilt
raised but now won't lower. Fluid is ok, tilt motor runs but won't engage to
lower unit. About a week ago unit worked fine. Thanks.
Joe

On 09 Sep 2003 13:52:35 GMT, (Jodon2) wrote:

Just bought a 21' Renken with a 3.7 Merc I/O. Problem is that the outdrive tilt
raised but now won't lower. Fluid is ok, tilt motor runs but won't engage to
lower unit. About a week ago unit worked fine. Thanks.
Joe

Joe-

Usually this problem is caused by "dry" seals and/or pistons on the
tilt unit. Mild oxidation on the rams (pistons) can also do it.
There should also be grease fittings on the main "pivot" point
connecting the transom mounts to the engine housing. Use a good grade
marine lube on the pivot.

Try this: wipe a light coating of teflon grease onto the extended
pistons. Have some push the "trim down" button while you physically
push down on the lower unit. If you can push it down, the grease will
help lubricate the rams.

Next time you haul-out, give the trim rams and pivot a little TLC.

If this doesn't do it, you may have bad seals or a bad valve in the
pump, but I'd sooner think it was the rams and/or pivot.

Good luck,
noah

So you're saying the pump is running but the out drive is not moving. And
you are certain you are going down. Then it is probably the pump. You
don't say what year. Way back merc had one line to each cylinder. Now they
have two. You can loosen the lines at the distribution block under the
drive and see if the drive lowers. It will make a mess and the drive will
go down fast so be ready. A strong guy can hold up a drive but expect it to
be heavy or you will be surprised. That will eliminate that the drive is
hung or binding. You can also tell by the pump noise if the pump is
straining or not. The pump is a reversible hydralic pump.

"Jodon2" wrote in message
...
Just bought a 21' Renken with a 3.7 Merc I/O. Problem is that the outdrive
tilt
raised but now won't lower. Fluid is ok, tilt motor runs but won't engage
to
lower unit. About a week ago unit worked fine. Thanks.
Joe

Bad rams.... $300 ea. sorry...

Capt. Frank Hopkins

http://www.home.earthlink.net/~aartworks


noah wrote:

On 09 Sep 2003 13:52:35 GMT, (Jodon2) wrote:


Just bought a 21' Renken with a 3.7 Merc I/O. Problem is that the outdrive tilt
raised but now won't lower. Fluid is ok, tilt motor runs but won't engage to
lower unit. About a week ago unit worked fine. Thanks.
Joe


Joe-

Usually this problem is caused by "dry" seals and/or pistons on the
tilt unit. Mild oxidation on the rams (pistons) can also do it.
There should also be grease fittings on the main "pivot" point
connecting the transom mounts to the engine housing. Use a good grade
marine lube on the pivot.

Try this: wipe a light coating of teflon grease onto the extended
pistons. Have some push the "trim down" button while you physically
push down on the lower unit. If you can push it down, the grease will
help lubricate the rams.

Next time you haul-out, give the trim rams and pivot a little TLC.

If this doesn't do it, you may have bad seals or a bad valve in the
pump, but I'd sooner think it was the rams and/or pivot.

Good luck,
noah