2014 Mercury 115 EFI not starting - new starter needed?

logjammin

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Jan 6, 2022
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14
Please bear with me, I am new to both boating and to engines. I've learned a lot in my short time with a boat but have a LONG way to go.

I've uploaded a short video of me trying to start the motor here.

Long story short: I'm hoping someone might be able to identify what some recent weird behavior from the boat means, as far as why the motor isn't starting.

The motor's behavior when starting the engine has been weird for approximately 2 months, prior to it completely not starting about one week ago.

I doubt this matters much but for completeness - I live in rural Guatemala and parts are hard to find here. The usual best way to get things is to find someone traveling from the USA soon and ask them to bring parts in their luggage.

The original "problem":
Beginning 2 months ago, every time I needed to start the engine, I had to turn the key twice. I would turn it once and hear a loud CLICK under the motor helmet. I'd wait a couple seconds, turn the key a second time, and the motor would start.

I'm quite dumb, but I'm at least smart enough to have taken the helmet off to watch what was going on. It turns out the loud CLICK from the first key turn was Small Gear #1 (see RED in Pic below) popping up and engaging/interlocking with Giant Gear #2 (see GREEN in same pic). The second key turn would get the whole motor running. You can see this happen in the video linked above.

boat_02.jpg

Being new to boating and not the brightest bulb, I didn't think this was too much of a problem. I just thought, OK, I guess I'll just turn the key twice, no big deal.

Problem worsens:
About one month ago, after still needing the first key turn to pop up Small Gear #1, I started sometimes needing to turn the key multiple times afterwards to start the motor.
Eventually I realized -- if on the second turn, if I left the key turned while starting (that is, I turned the key to start the motor and held it in the fully turned, ignite position), it would ALWAYS turn on eventually. It would take anywhere from perhaps half a second to just over a full second. The motor would be completely silent for that 0.5-1.0 seconds, then start like normal.

Again, I just thought, OK, I guess I'll just turn the key twice and hold it a while on the second turn, no big deal.

Problem starts getting legitimately bad:
About one week ago, that 0.5-1.0 seconds started lengthening. It might take 1.5 seconds, or 2 seconds. The day before the motor fully crapped out, it took a solid 4 seconds of holding the key before the motor started.

And here we are now:
Now, no matter how long I hold the key, the motor will not start. It's definitely not the battery. I'd be shocked if it were the spark plugs or the pencil coils, both are quite new (less than 6 months old).


I haven't been able to find anything via Google about people with experiences of needing to hold the key in ignition for multiple seconds before it would start. Does anyone have any experience with this, or guesses or conjecture?

Perhaps I just need to buy a new starter? The part number appears to be 410-12382 (Amazon link to what I think I need).

Thank you. My apologies for the novel.
 

brodmann

Chief Petty Officer
Joined
Jun 17, 2008
Messages
426
The small gear is your starter, the large gear is your flywheel. You've either got low voltage going to the starter or the starter is just bad. If the small gear is popping up every time, then the starter itself is most likely bad. Here's the real test of a bad starter. Yes, I'm absolutely serious, I'm not "pulling our leg" here. You'll need a helper. Turn and hold the key and have someone tap the starter on the side with a hammer. A bad starter usually has bad bearings or bad brushes inside. Tapping it with a hammer will jar it and make it work. I had an old pick up truck that needed the starter replaced, but I just never took the time to do the job. It was just used occasionally to haul stuff to the dump and to pull a small boat. All 3 of my sons crawled under that old truck to smack the starter at one time or another. It was like that for close to a year before I finally replaced the starter. If you Google it, you can probably find a shop that rebuilds starters for a lot less than purchasing a new one. It's usually just brushes and bushings that need to be replaced. Good luck!!
 

alldodge

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Staff member
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42,079
^^Agree
Also what is the battery voltage before and during trying to crank at the starter?
 

logjammin

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Jan 6, 2022
Messages
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You guys rule, thank you so much!

I live in a pretty rural spot, the nearest road is over two miles away (three km) away. I have a helper who's returning Monday, I'll try this with him.

I'll check the change in battery voltage this weekend -- but I can tell you, the battery totally drained (twice! I recharged with a trickle charger) in the last week as I've tried to start it, so a lot of power is clearly being consumed.
 

alldodge

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Staff member
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Messages
42,079
I'll check the change in battery voltage this weekend -- but I can tell you, the battery totally drained (twice! I recharged with a trickle charger) in the last week as I've tried to start it, so a lot of power is clearly being consumed.
Totally draining even once can damage a Bat so it won't come back.
With Bat disconnected from charger for a couple hours it should be no lower the 12.6V
 

logjammin

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Jan 6, 2022
Messages
14
Thank you again, I wasn't aware of that. It's been drained to the point of 12.35-12.40V a number of times and last week, for the first time, it measured at just 2V. The trickle charger still brought it back, but I'll definitely keep in mind that I might have battery problems and need a new battery.

It's hooked up to a bilge pump which unfortunately runs every 2-3 hours. There's a leak somewhere that I have yet to find.
 

brodmann

Chief Petty Officer
Joined
Jun 17, 2008
Messages
426
Your arms aren't long enough to turn the key and tap starter with a hammer? Maybe you need a hammer with a longer handle!! I'm just kidding you, but the hammer trick is a sure fire starter tester! At 15 years old, I got a job at a great little neighborhood gas station. The first freeze warning that we had, the owner gave all of us a pair of jumper cables, a hammer and told us to go to bed early that night because he would be calling us early in the morning to get us to go help folks get their cars going in the morning. Cold weather will let you know if you have a weak battery. We were given instructions on how and where to tap a starter if it engages, but doesn't spin with the driver holding the key to the start position. He was right. I had to go to 2 houses that morning to get folks going. One just needed a jump start, and the other needed a "starter tap". He was a great guy and felt it was his personal responsibility to keep all the cars in the neighborhood in good working order. He frequently did repairs at no charge for widows and folks that were in financial distress. We had several ladies whose husbands were killed fighting in Vietnam that we were not allowed to charge for their gas, oil or whatever else was needed under the hood. He knew every customer by name! He died about 10 years ago and the neighborhood honored him with a bench overlooking a neighborhood playground with a plaque with his name on it. He taught me so! Almost every job I've had since then has been in customer service in one way or another, and no college class ever prepared me for life as much as that first summer working for that guy! Knowledge is meant to be shared! He used to ask people if they'd ever been to the Dead Sea. He would then explain that the dead sea was "dead" because it had rivers flowing into it, but none flowing out. It's nasty and stinky because it's stagnant. He said that's what happens to us if we just take in information and experiences and don't share what we learn with others. He was a great guy!!
 

logjammin

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Joined
Jan 6, 2022
Messages
14
Just wanted to follow up and say, yes, you guys were 100% correct. With some "taps" (more like serious hits!) of the hammer to the starter, the motor started to turn. I'm just going to order a replacement rather than try to repair it, it seems pretty far gone.
I can't stress enough how much this helps. Thank you again for your help šŸ¤Ÿ
 
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