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09-08-2021 08:45 PM
kswalleyer Ive never worried about spinning props...kinda thinking msh the gears would be bad eventually...andway I run my boats a long time and have never had to rebuild a lower unit for any reason except a stike on a stump once. I am only curious in this thread as I would like to not get my line tangled in the prop.... there's no unwrapping the line on a 300 with a jack pate while in the boat. Had it happen this february ...had to go to bank to untangle. Thats OK as long as you have bank relatively close and its not super cold...surface temp was 40, a bit crisp. The kicker got me to a ramp in 15 minutes . being 15 miles off shore I would have likely had to just drive in and hoping I didnt lose a seal...
09-08-2021 06:33 PM
REW p.s.
Spinning props:

Some years ago, my buddy and I were fishing on a north central lake for Walleye. We were both using a jig and a shiner for bait.

We were using the electric motor to move along a shoreline as we jigged the shallow water for walleye.

After a while, we noticed that we had a pair of Loons swimming along behind us. We also noticed that from time to time, it seemed that the Loons were diving right under the motor as we were slowly moving along through the clear calm water of that particular morning.

I mentioned the sight to my buddy who agreed that he had also been watching the loons as we worked our jigs.

The entire process made me start to think about what the loons were doing and why they were doing it.

As I looked back, and over the transom, I noticed the sparkle through the clear water of my polished stainless steel prop rotating in the slip stream of the boat being pulled by the trolling motor. I did not have the engine in gear at the time. I mentioned this to my buddy and we both agreed that it would be interesting to simply tip the engine up out of the water to see what would happen.

So, I tipped the engine all of the way up and out of the water and also put the motor in gear as well to stop the stainless prop from spinning.

I went back to my seat and observed each of the loons make one more dive under the boat. Then, they both looked quizzically at us and both swam away to look for minnows else where.

So, save the loons from going crazy looking for minnows when the see the flash of a spinning stainless prop that is in the water and the motor is not in gear.

Take care
09-08-2021 11:13 AM
SLE
Quote:
Originally Posted by Thalweg View Post
............ Additionally, the 300 Pro XS parts diagram shows a mechanical shift system (see attached). I am not a certified Mercury mechanic, and reserve the right to be wrong,
I stand corrected, so maybe I should reserve the right to be wrong, lol! So it appears that the new V8/V6 series engines use an electronic actuator for shifting duty no matter if you order the mechanical or DTS option by the looks of it. Really, the only way to determine if you have DTS is to look for an actual cable between the shifter and the engine. I guess it makes sense from a manufacturing standpoint as the lower unit and engine is basically the same for either setup and allows for re powers to be done without changing the controls. Now it makes me wonder if you can follow the same sequence as what is described for the Verado's to lock them in gear or if that only works on the DTS optioned engines and the mechanical shift engines have no way to lock them into gear?

Learned something new today, thanks.
09-08-2021 09:38 AM
Thalweg I also found the shift actuator on the parts page. The diagram only shows one actuator (no separate type listed for mechanical). The attached figure indicates there is a wire bundle into the top of the actuator.
09-08-2021 09:28 AM
Thalweg
Quote:
Originally Posted by SLE View Post
Thalweg, yes they indeed shift the same way at the engine, the difference being one done by a cable attached to the shift handle and the other done by a servo motor. Any mechanical shift engine can be engaged with the engine off, just pull the throttle forward or backward to engage. On occasion, the gears will not mesh and will bind slightly making it tough to get it to engage. This is likely what you've experienced. Just rotate your prop a a little and try again and it'll likely slip right into gear.
SLE - from what the dealer told me, the mechanism that performs the final shifting function is the same on both types of motors. The difference is where the signal is converted to digital. Before my previous response, I verified that when shifting my Pro XS, the gears did not engage (including rotating the prop by hand). On my previous, 175EFI ( an old school mechanical), it behaved as you described. The 300 Pro XS does not behave the same way. Additionally, the 300 Pro XS parts diagram shows a mechanical shift system (see attached). I am not a certified Mercury mechanic, and reserve the right to be wrong, but this part appears to interface to the cables and convert throttle movement to a digital harness.
09-08-2021 08:55 AM
SLE Thalweg, yes they indeed shift the same way at the engine, the difference being one done by a cable attached to the shift handle and the other done by a servo motor. Any mechanical shift engine can be engaged with the engine off, just pull the throttle forward or backward to engage. On occasion, the gears will not mesh and will bind slightly making it tough to get it to engage. This is likely what you've experienced. Just rotate your prop a a little and try again and it'll likely slip right into gear.
09-08-2021 08:20 AM
Thalweg
Quote:
Originally Posted by SLE View Post
The new 300 V8 pro xs can be either mechanical shift or DTS depending on how they are ordered. Very easy to figure out. With the engine and ignition off see if you can shift into forward or reverse. If you move your throttle into one of those positions and your prop still spins freely, then you have DTS. If not, and the prop doesnít spin, then itís mechanical.

For reference, on the newer engines I believe the Verado and Sea Pro come with DTS standard while itís optional on the other series of engines.
I was told by a dealer that the final shifting mechanism on the motor is the same for mechanical vs DTS. For a mechanical setup the cable is routed to the motor and is converted to a digital signal at the motor. For a DTS system, the digital signal is sent from the throttle control all the way to the motor. My mechanical 300 Pro XS will not shift into gear without power applied.
09-08-2021 07:58 AM
last chance
Quote:
Originally Posted by repoman View Post
Yes, but I have never seen where someone has proved that a spinning prop while going down the road is good for you lower unit.....if its not good for it, its gotta wear something out.
it doesn't wear as much as you might think. no faster than the prop turns it never gets the lower unit oil hot. so the oil stays on the moving parts better than normal. the oil keeps the moving parts from wearing only on a minute amount if any at all. the lower unit would probably last 100 yrs or more as long as it has clean oil. just think how many hard revolutions the prop turns in a normal year and some will still last 30 or 40 yrs with some lasting even longer. most powerheads go well before the lower unit. so I'm a firm believer it doesn't hurt a thing to let it turn. but on the other hand, if it makes you happy to put it in gear it surely won't hurt anything. of course this is just another opinion and it's mine.
09-08-2021 07:33 AM
kswalleyer
Quote:
Originally Posted by SLE View Post
The new 300 V8 pro xs can be either mechanical shift or DTS depending on how they are ordered. Very easy to figure out. With the engine and ignition off see if you can shift into forward or reverse. If you move your throttle into one of those positions and your prop still spins freely, then you have DTS. If not, and the prop doesnít spin, then itís mechanical.

For reference, on the newer engines I believe the Verado and Sea Pro come with DTS standard while itís optional on the other series of engines.
thanks!
09-07-2021 09:34 PM
SLE The new 300 V8 pro xs can be either mechanical shift or DTS depending on how they are ordered. Very easy to figure out. With the engine and ignition off see if you can shift into forward or reverse. If you move your throttle into one of those positions and your prop still spins freely, then you have DTS. If not, and the prop doesn’t spin, then it’s mechanical.

For reference, on the newer engines I believe the Verado and Sea Pro come with DTS standard while it’s optional on the other series of engines.
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