repairing overheating mercruiser and speedometer

troubleshooting a bad impeller on mercruiser alpha1 gen2

[@dragonsixtyseven1066]

Thank you for taking the time to do this video. I appreciated the thought that went into sharing the symptoms that led to your diagnosis and solution, including the parts you ordered. I also appreciate your narration skills and that you were working with your dad. The extra part about how you set the seal was a bonus. Nicely done.

[@henryserrano9809]

when you install the impellar do u put any grease?

[@cabincruiserlittlebigtime8445]

thank you i appreciate the kind words.

[@richardwolske2015]

You never want to start the engine without a good water supplies to the lower unit pump your impeller looks to have ran dry damaging the rubber impeller and also burns the flapper backwash protector off that pin you found ! Good luck 👍🇺🇸

[@dalejustice9207]

Thanks buddy I'm getting my first Mercruiser alpha one drive boat this week n I been watching n reading and you gave some good information bout it. Thanks..

[@orvilleholt5728]

An overheating problem can be many things, if you fixed the problem by replacing the impeller then your lucky. That pin you found that held the flapper in the exhaust manifold tells me the flappers that keep water from back flushing into the manifold are worn or burn out. I can hear the pieces of broken flapper inside the manifold of my boat. When they overheat those flappers bust apart. I've replaced the impeller on my mercruiser as well as the pump housing. The shaft seal on the housing was won out badly. At an idle the temp gauge doesn't even move, however when I get back out on the lake I will be lucky if the overheating problem has went away.

[@zangin]

Thanks! This is exactly what’s happening also with my boat.

[@kevinmccarey5015]

Thanks Buddy, I enjoyed your video very helpful to me on my first Alpha Gen one out/drive

[@warrenbrou8708]

THANKS FOR THE VIDEO, YOU SHOWED ME SOME TIPS I DIDN'T PICK UP, THANKS

[@stevezphone]

you have a beautiful boat. well done.

[@cabincruiserlittlebigtime8445]

thanks.

[@darrenloud4067]

Check your exhaust flappers I think that bar is part of that

[@robertgray6512]

Dude. Great job giving excellent details for us shade tree mechanics. Let us know how the Penzoil out drive lube lasts.

[@bruceabrahamsen221]

Good job, thanks

[@redflag5512]

Would you need a new gasket for when you separate the outdrive. You don't use the same one right?

[@barrybebenek8691]

Thanks for this video. So clear on your issue and how you fixed it. I have exactly the same problem, and now will go after the impeller. Thanks again! 🇨🇦👍🏼 Subscribed for more.

[@crisprtalk6963]

boats are a lot of work. Fun though. Good video!

[@Randallsixx13]

BIG thanks for this info.

[@Bierdaddy1]

Thank you, sir, for posting a video that supposedly wasn’t going to have details. Lol. The details you did include taught me a lot about outdrives. My speedo doesn’t work and now I think I know why. I am tackling these projects on my new-to-me motor boat this weekend. Did you go with oem parts?Thank you to the other boaters’ replies too. I learned a lot here. Fair winds & calm waters! (Yah I am a sailor now in a motor boat.)

[@Dougie33]

what was the little peice you found for?

[@drcoffee5588]

Im not sure if you noticed but the seal around the shift shaft in the lower unit looks cracked at the front edge. Might be where water could get into your lower drive. You can replace the whole piece to the newer version for about $25.

[@mrzif0013]

my engine overheat then was fine rest of day. i went thru weeds but did not see weeds on prop when i stopped to check the prop for weeds. wdyt?

[@Duane002]

Next time try using 2 larger Phillips screwdrivers to pry that inner guide seal out.

[@charlie3461]

I think there's 6 zerk grease fittings mine does on my 87 Larson

[@chrislynch1438]

Please tell me what you did with that pin. We found the same thing when we pulled the lower unit, and are not able to reattach because we don’t know where that pin goes

[@larrywalden626]

They say if you put the boat in gear to lock the shaft before dropping the lower stern drive makes it easier to reassemble

[@aceryas]

Haven't finished video yet, but that rod you found was part of the exhaust shutters

[@portagepete1]

My water pump looked like yours fins staying bent from age but rubber looking good like yours. I don't see anybody on KZbin checking water pressure and flow up at the thermostat housing of all the houses going to that it is the one on the passenger side front, so to check to see if you have a water pump issue pull that hose off and look to see if is pumping volume and pressure?? on mine i flipped the water pump upside down and forced the fins in the clockwise direction like they have to be with needle nose pliers and it now works better than new, but i have other problems there is restriction in the water flow somewhere due to rust blockage, i even took off the water pump hose and tried to blast it clean with water pressure from the city water pressure hose and no luck yet. One more small thing that speedo plastic hookup that is fraggle just put in a brass threaded niple from the hardware store.

[@portagepete1]

Up date, My boat is like new now when it was overheating i took the hose off the bottom of the exhaust manifold put it in a 5 gallon bucket started the engine and the temp went right down to normal so the problem was cold lake water could not get into cool the engine because rust in manifolds were blocking water from exiting i was able to clean the rust out with air hose and water hose

[@eclipser2004]

@@portagepete1 Thanks for telling us this!!

[@thewhomphlew]

That rod belongs to your water shutter in your exhaust. IT IS IMPORTANT! The rubber degraded and the rod is all that was left. You have a v-8? 2 shutters. They're on the top of your y-pipe under the 4" dia hoses Shutters prevent water from coming in your engine cylinders when you come off a plane the wave doesnt shove into your engine.

[@Biggyniner]

It will also stop water from coming back into your engine, via the exhaust from a vacuum condition or if your engine diesels when you turn it off

[@Jhonviper00]

The piece you found is just a guide for the impeler housing last person must have left it by mistake.

[@eclipser2004]

I would stick with mercruiser quicksilver parts. I heard some people talk about their bellows splitting after a year or two with the cheap no-name brands.

[@bruceabrahamsen221]

Check thermostat, impeller and last thing is the water pump on front of engine..

[@marioflores768]

I have a little issue. Have no reverse. Any thoughts?

[@cabincruiserlittlebigtime8445]

Mario Flores did you lose reverse after having lower unit off?

[@robertguthrie6407]

Before you took the bottom end off of that unit did you make sure that you were in the forward position on the throttle it is important or else you will have to take everything apart again and start over

[@andrescano2120]

Cuantas horas tiene esa bomba de agua en el barco?

[@cabincruiserlittlebigtime8445]

No rd seguro. es el que estada en el cuando lo compre

[@marioflores768]

Andres Cano se cambria casa dos anos

[@bsoucier]

What is the piece (Small warn shaft/pin) found loose in the unit? I found the same thing in mine.

[@cabincruiserlittlebigtime8445]

Brent Soucier sorry for the late response I just saw your comment. It's a shutter pin. their rubber flappers in the exhaust that keep water from flowing backward into the engine. when they wear out the pin/hinge makes it's way thru the exhaust to the lower unit. hope this helps.

[@drhandy3376]

Brent Soucier the small rod you are holding appears to be an alignment tool used to line up the hole in the gaskets and the housing when reinstalling the water pump housing and may have been left their when the water pump was last replaced

[@alecfowler7147]

That pin is from your exhaust baffles shutter . ..pull the exhaust down tubes, (easy to do) and check in your Y tube . I'm thinking they may need replaced . ( its a butterfly assembly to stop back wash water from entering the engine when stopping the boat), this could hinder cooling if the rubber parts come loose also

[@richardwolske2015]

@@drhandy3376 ., nope it’s a backwash flapper pin the rubber has been burnt away , cause .? Run off the hose without the cooling water to protect !

[@manuelcontreras6319]

Hey man I have cuestion..I have one boat with omc cobra 5.0 inboard engine and I did turn on like 2 days ago and the temperature goes up to 180 I don't know if that's normal or I have to fixing something

[@cabincruiserlittlebigtime8445]

180 is fine. I wouldn't start to be concerned until about 210

[@manuelcontreras6319]

@@cabincruiserlittlebigtime8445 ok thank you for your help I really appreciate it

[@orvilleholt5728]

That pin is for the exhaust flapper.

[@paulym5814]

Not good to run it with low water flow. You can warp the head with too much heat.

[@frydoggo]

Penzoil crappy oil ,,,,,, jhon force castrol.....

[@raywares7342]

U

[@FlyMeAirplane]

Shouldn't the thermostat in the engine keep the temp at say 180F. I suspect your thermostat is stuck open... Cool video tho!

[@sailingsportsandetc.2081]

I’ve had a similar issue to this guy with a similar engine my thermostat is at 142 I removed it all together for now because it was kind of sticking but I believe if the water pump isn’t supplying enough water, it wouldn’t matter if the thermostat is open or closed.

[@dale7164]

No because the water has to get pumped there first by the outdrive!

[@sailingsportsandetc.2081]

DLE From The CLE Yeah, if the pump isn’t supply enough water, even if the thermostat is operational, it would still overheat just not as severely with the thermostat operational vs not.