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Old 06-01-2010, 06:55 PM   #1
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Default Trailer switch on throttle handle

When using the up/down outdrive switch on the throttle, the outdrive only comes up partway. The trailer switch brings it up farther, but it is still in the water. Is it OK to run the engine and use the trailer switch to get the outdrive up so I can get closer to the beach? The boat is a single engine 2900SCr with Bravo 2 outdrive.
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Old 06-01-2010, 09:10 PM   #2
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sometimes i had to use the trailer position to get the boat as far as possible on the beach, but dont play to much with the trottle, just use it very carefully just a little bit of gas (power) to put the boat forward.

now with my new boat i dont do it anymore, because after doing it many times a year the sand will take away the gell coat off the'lowest point of the bottom ( i had it on my 2855 bayliner) so now i allways keep the boat floating on the water and walk a little bit through the water to the beach.

greatz, ed
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Old 06-01-2010, 09:24 PM   #3
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I wouldn't run the engine in gear beyond the trim limit. You have a trim limit sensor which cuts the trim button. Think of it this way, there is a reason the manufacturer stopped you from trimming out so far. AND, there is a reason they call it the Trailer button and not the 'really shallow water button'.
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Old 06-02-2010, 10:15 AM   #4
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Hi Yes that's true. as you shaft and outdrive has u-joint that can NOT rotate past a certain point. they will flex when not rotating as to trailer the boat but will not turn and running it past the trailer button will eventualy damage the u-joints and voila expencive repair. I have a little rubber dingy and a paddle. I anchor away from shore and paddle( well the wife does I sit in back and yell row row row beating on a drum ha ha ha ) but you see my point...
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Old 06-02-2010, 02:42 PM   #5
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Since I routinely trim mine up quite high when idling through skinny water - with no ill effects thus far, I was a little curious about this. The way I understand it, the double u-joint (double Cardan joint) configuration allows for more articulation of the joint than would be possible if using just one joint. It also minimizes vibration since the shaft speed remains constant regardless of it's running angle. Spicer says it will run at 25* at full design load briefly, and 12* continuosly.

Curious still, I looked at my MerCruiser manual, page 22 -

"Never trim the sterndrive unit up/out using the TRAILER switch while boat is under way at engine speeds above 1200 RPM. Use extreme caution when operating with sterndrive unit raised. Severe damage to the sterndrive unit may result if unit is raised beyond the gimbal ring support flanges at engine speeds above 1200 rpm".

Additionally, on page 23 -

"To raise the sterndrive unit for trailering, beaching, launching and low speed (below 1200 rpm) shallow water operation push the trim button to raise the sterndrive unit to the full UP/OUT position".

Apparently there are two issues in play. 1st - running at more than 1200 with the drive all the way up places too much stress on the components and 2nd - running with it up could possibly bring the water intake holes out of the water resulting in over heating.

It's all good then. Trim it up as far as you need to but keep the RPM's below 1200, and watch the temp gauge.

Dan
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Old 06-02-2010, 03:06 PM   #6
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Quote:
Originally Posted by ss3964spd View Post
Since I routinely trim mine up quite high when idling through skinny water - with no ill effects thus far, I was a little curious about this. The way I understand it, the double u-joint (double Cardan joint) configuration allows for more articulation of the joint than would be possible if using just one joint. It also minimizes vibration since the shaft speed remains constant regardless of it's running angle. Spicer says it will run at 25* at full design load briefly, and 12* continuosly.

Curious still, I looked at my MerCruiser manual, page 22 -

"Never trim the sterndrive usit up/out using the TRAILER switch while boat is under way at engine speeds above 1200 RPM. Use extreme caution when operating with sterndrive unit raised. Severe damage to the sterndrive unit may result if unit is raised beyond the gimbal ring support flanges at engine speeds above 1200 rpm".

Additionally, on page 23 -

"To raise the sterndrive unit for trailering, beaching, launching and low speed (below 1200 rpm) shallow water operation push the trim button to raise the sterndrive unit to the full UP/OUT position".

Apparently there are two issues in play. 1st - running at more than 1200 with the drive all the way up places too much stress on the components and 2nd - running with it up could possibly bring the water intake holes out of the water resulting in over heating.

It's all good then. Trim it up as far as you need to but keep the RPM's below 1200, and watch the temp gauge.

Dan


yep thats what i also mean in my reply.......carefully low speed and rpm

greatz, ed
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Old 06-03-2010, 01:37 PM   #7
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Thank you. I didn't have the merc manual, but called them yesterday, and they said the same thing. 1200 RPM max. in trailer mode.
Thanks again!
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Old 06-03-2010, 01:42 PM   #8
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