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How do i remove the negative trim limit on a Suzuki DF300AP

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How do i remove the negative trim limit on a Suzuki DF300AP

Old 04-03-2016, 10:28 AM
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Originally Posted by coores14 View Post
I'm reviving this thread because I'd like to add the negative trim to my engines. It seems that mine aren't going into full negative trim based on the fact that the trim motor doesn't keep running when I'm all the way down and my gauges do still show trim settings. Has anyone confirmed the EXACT procedure to do this with the key switch, lanyard, throttles, etc?
I can send you the procedure. The downside to this is that your gauges will not read the trim properly.

Mike
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Old 04-03-2016, 10:31 AM
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Sent it to your email.

Mike
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Old 04-03-2016, 12:35 PM
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Here are the instructions that Mike emailed, in case anyone else ever searches for this again.
Thanks Mike!

Turn the main key to the "ON" position.

Pull out the emergency stop switch lock plate.

Make sure that remote control handle is in "NEUTRAL".

Confirm the select switch LED lights, if not, depress the select button on the switch panel.

Depress the "THROTTLE ONLY" button.

Move the control handle forward until the caution buzzer sound one time.

Press the "DOWN" side of PTT- switch for three seconds and
the buzzer will sound twice briefly indicating the setting has been canceled.

Return the throttle to the fully closed position.
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Old 07-03-2016, 01:18 PM
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Looking to figure out how to adjust my "engine raised stop" one motor only comes 3/4 up the way up. Leaving the lower and prop underwater when leaving the boat in water overnight.
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Old 10-15-2016, 03:04 PM
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Originally Posted by InternationalMarineMike View Post
I can send you the procedure. The downside to this is that your gauges will not read the trim properly.

Mike
So I followed the procedure above in order to get full negative trim (and to unload the trim cylinders when sitting on the trailer). It worked fine and I have full negative trim on both engines as desired.
Now... why can't the C10's be reset to work with this new trim setting??
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Old 10-16-2016, 02:35 AM
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Can someone explain me why you would like to add negative trim?
If you need to tuck your lower unit more under your hull to get the stern out of the water you have a problem!
Using the trim to adjust the boats level when planing is not the best way to do that as you will loose thrust to lift the stern instead of propelling forward.
The best position of the lower unit is parallel to the water surface as the prop thrust cone cone pushes forward, if you need to trim more negative/in then the thrust cone is pointing downwards aining upward trust and loosing forward trust.

If you have a problem with stern heavy boat level at cruising speed then you should solve this issue and not patch it trimming negative/in.

The solutions for bringing a boat to level are:
- weight distribution: shift weight forward, in extreme cases add sand bags in the anchor locker
- stern lifting propellers
- trim tabs, yes they are made for exactly this reason
- positive flotation brackets
- transom wedges (not a real solution as they do the same as negative trim, but you don't need to reprogram BCM and loose the trim gauge)

Chris
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Old 10-16-2016, 04:47 AM
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Originally Posted by ChrigelKarrer View Post
Can someone explain me why you would like to add negative trim?
If you need to tuck your lower unit more under your hull to get the stern out of the water you have a problem!
Using the trim to adjust the boats level when planing is not the best way to do that as you will loose thrust to lift the stern instead of propelling forward.
The best position of the lower unit is parallel to the water surface as the prop thrust cone cone pushes forward, if you need to trim more negative/in then the thrust cone is pointing downwards aining upward trust and loosing forward trust.

If you have a problem with stern heavy boat level at cruising speed then you should solve this issue and not patch it trimming negative/in.

The solutions for bringing a boat to level are:
- weight distribution: shift weight forward, in extreme cases add sand bags in the anchor locker
- stern lifting propellers
- trim tabs, yes they are made for exactly this reason
- positive flotation brackets
- transom wedges (not a real solution as they do the same as negative trim, but you don't need to reprogram BCM and loose the trim gauge)

Chris
mecury has always had negative trim since way back everyone else is zero until recently
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Old 10-16-2016, 04:57 AM
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Originally Posted by ChrigelKarrer View Post
Can someone explain me why you would like to add negative trim?

Chris
One reason could be that the boats transom itself does not have enough negative trim - ie. the earlier Contenders.
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Old 10-17-2016, 07:21 AM
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Originally Posted by ChrigelKarrer View Post
Can someone explain me why you would like to add negative trim?....
Because sometimes it's nice to be able to use full negative trim to get on plane quicker when the boat is heavily loaded and also to be able to let the weight of the engines rest on the tilt pin rather than the trim/tilt rods when on the trailer.

Now that that's out of the way, does anyone know how to reset the C10 gauges to properly reflect engine trim?
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Old 01-11-2017, 06:35 PM
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Originally Posted by fly186 View Post
So I followed the procedure above in order to get full negative trim (and to unload the trim cylinders when sitting on the trailer). It worked fine and I have full negative trim on both engines as desired.
Now... why can't the C10's be reset to work with this new trim setting??
In Section 15 of the service manual (about page 51of that section) it shows how to "Cancel the down trim limit setting" and follows with "Setting the trim down position." I am thinking proper resetting of the limit to the lowest position might make C10s work right.
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Old 01-11-2017, 07:13 PM
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Here are the instructions for setting (resetting?) the down position limit. The way I read step 8 is that you can set the down limit anywhere including full down.

SETTING OF TRIM DOWN POSITION LIMIT
Once the ECM has been replaced or the trim sensor removed
and reinstalled, the resetting of the trim down position limit
should be performed.
Perform this set-up after the current position setting has been
cancelled, as explained in the following procedure.

CANCELING THE TRIM DOWN POSITION LIMIT SETTING
1. Turn the main key to the “ON” position.
2. Pull out the emergency stop switch lock plate.
3. Make sure that remote control handle is in “NEUTRAL”.
4. Confirm the select switch LED lights, if not, depress the
select button on the switch panel.
Depress the “THROTTLE ONLY” button.
5. Move the control handle forward until the caution buzzer
sound one time
Depress the “DOWN” side of PTT switch for three seconds and
the buzzer will sound twice briefly indicating the setting has
been canceled.
7. Return the throttle to the fully closed position.me.

SETTING THE TRIM DOWN POSITION LIMIT
8. Press the “DOWN” or “UP” side of the PTT switch so that the
optimum full trim down position for the boat can be obtained.
9. Move the control handle forward until the caution buzzer
sound one time.
10. Press the “DOWN” side of the PTT switch three times within
three seconds. The buzzer will sound one time briefly indicating
the setting has been accepted.
11. Return the throttle to the fully closed position and install the
lock plate on the emergency switch. Operate the full tilt up
and full trim down operations several times by pressing the
PTT switch and check that the setting of the down limit is
properly set.
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Old 01-20-2017, 06:35 AM
  #32  
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Using the instructions above will reset the lower trim stop. However, it appears the engine is programmed to reset the stop point to 1-1.5 degrees above the hard stop. (Remember, you can find the hard stop by opening the tilt release screw on the starboard side of the motor.) I was able to trick the software and get the programmed stop within .1-.2 degrees of the hard stop by doing the following:
1. Program engine as above to get programmed stop within 1-1.5 degrees of the hard stop.
2. Lower engine to hard stop.
3. Tape iPhone or other digital level to the side of the motor and set to 0 degrees.
4. Trim motor up and then back down. It will be 1-1.5 degrees off the hard stop.
5. Build up the diameter of the trim sensor lever (by top of starboard tilt cylinder) with duct tape and drop the motor down until the programmed stop kicks in. You want to put enough duct tape on (5-6 layers) until the motor stops at around 2-2.5 degrees.
6. Reprogram the trim stop using steps 1-11 above.
7. Tilt up motor and remove tape.
8. Motor should now trim down to very close to the hard stop. You can fine turn using different thicknesses of tape.

My motor now trims down with .1-.2 degrees of the hard stop and the trim indicator on the C10 is accurate. One more layer of tape and I probably would have that squeal that tells your ear the trim is all the way down.
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Old 01-22-2017, 07:25 AM
  #33  
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Originally Posted by InternationalMarineMike View Post
I can send you the procedure. The downside to this is that your gauges will not read the trim properly.

Mike
With the above information, what has changed that it now works with C10?

I am glad I sub'ed to this as I would like full trim range, but not at expense of not working on C10.
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Old 01-22-2017, 05:03 PM
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Originally Posted by chad.sfds View Post
With the above information, what has changed that it now works with C10?

I am glad I sub'ed to this as I would like full trim range, but not at expense of not working on C10.
With the instructions originally posted the electronic lower trim stop was removed. This allowes full trim, but apparently since there is no lower trim set the C10 does not work. Using the remaining instructions and tape resets the electronic lower stop. I only got 1 degree more trim but it made a perceptible improvement.
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Old 04-17-2017, 05:45 PM
  #35  
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Thanks Blue Racer for posting, I just bought transom wedges that i haven't installed yet and now it appears that I don't need to. I used a short piece of thin wall 3/8" tubing slid over the trim sending unit arm and now I can trim all the way into the physical stop. The trim gauge works fine as well
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Old 06-30-2018, 09:30 AM
  #36  
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This was a huge help!! Thanks. Before and after
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Old 09-19-2018, 02:06 AM
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Default uneven twin motor tilt

Did you ever get a resolve to your question? I have the same issue with twin 250 Suzukis.
thanks

scarab63
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Looking to figure out how to adjust my "engine raised stop" one motor only comes 3/4 up the way up. Leaving the lower and prop underwater when leaving the boat in water overnight.

Last edited by waynesworld01; 09-19-2018 at 02:29 AM. Reason: Clarifying question
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