Re: [OMC-Boats] OMC-Boats Digest, Vol 5, Issue 10

From: Lee Shuster <lee.k.shuster@...>
Date: Tue, 25 Sep 2007 13:48:08 -0600

Hi Kevin,
It's fairly easy to troubleshoot the tilt motor. But you need the
following before you begin:
1) RTFM. Documentation. Do you own or have you looked at a Seloc or OMC
manual? You might even find they have them in your public library.

           A wiring diagram is also helpful. I have posted a diagram on
my website here:
2) A basic VOM (Volts-Ohm Meter) and some alligator-clip test leads can
be helpful to free up a hand. Or a 12-V test bulb can also be
substituted in a pinch.
3) A freshly and fully charged battery. (Many times relays will
"chatter" under load when there simply isn't enough voltage or current
4) Take common-sense safety precautions: Insure there are no lingering
gaseous fuel fumes in your work area.

The basic Tilt circuitry is pretty simple, consisting of five basic
elements (any or all of which can cause problems):
A) Fused 12-volt power source under the dash, that,

B) feeds a dash-mounted Single-Pole, Double-Throw (SPDT - center-off)

C) The switch has two output (remote control) wires:

         1) GREEN (think DOWN, as in Green-Grass) and

         2) BLUE (Think UP, as in Blue-Sky),

          both of these small ga wires travel back to the transom area
where there are

D) two RELAYS,
            1) one for UP (blue) and
             2) one for down (green).
              These INDENTICAL Relays (or solenoids) are basically
remote controlled switches, that permit the heavier, larger ga. Red
wires to pass on the
              high current to drive the
E) DC tilt motor in the appropriate direction (Up or Down).

The clicking sound you describe can be caused by several things:
1) Sometimes high-resistance, dirty, or corroded contacts anywhere in
the path (A to E) can cause this sound. Try and troubleshoot using the
isolation method. DOES the clicking sound happen with both UP and DOWN
operation? Then suspect something that is common to both, such as the
tilt motor, or clutch pack, or power source. The impact hammer clutch
pack is what allows the sterndrive to kick up when it strikes an
underwater object. It is outside the transom and sits next to the
quandrant gear. The hammer clutch basically allows the motor to get up a
"head-of-steam" before it engages, otherwise the motor stalls (which
results in relay chatter).
2) Personally I'd start and verify that the battery voltage is Ok. The
make sure the fuse to the tilt switch is not corroded. Are the
connections at the dash-board switch OK? How about the resistance of the
small ga (blue/green) wires bewteen the swtch and the relays? The
relays are interchangeable. You can swap them out for live testing or
emergency backup use (make sure you label all the wires, as it's easy to
hook them back up incorrectly!) You also need to check and clean the
heavy ga red/black wires that feed the high current to the relays. (Some
later models also had a fusible link in the red wire connected to the
battery at the starter relay.)
3) The most common thing to fail on 40+ yr old boats, is corroded
wiring. Then the relays also do fail. The tilt motor can and does fail.
Don't forget to check to impact/hammer clutch, and lastly, make sure the
drive leg itself is totally free and can manually be lifted up and down
(have a friend help you do this after removing the quadrant gear.)
Good luck -- hope this makes sense. Let us know what you find out
after following these hints.... Others may wish to chime in with their
helpful hints....
Lee Shuster
Salt Lake City


From: omc-boats-bounces@...
[mailto:omc-boats-bounces@...] On Behalf Of kevin
Sent: Tuesday, September 25, 2007 9:00 AM
To: omc-boats@...
Subject: Re: [OMC-Boats] OMC-Boats Digest, Vol 5, Issue 10

hi im having a problem with tilt lift not working clicking noise in
solenoid can you help
thanks kj
Received on Tuesday, 25 September 2007

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