470 problems

karayj

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468
New problem right before winter rising go figure.
cell last week I took it out for a first time run of a newly purchased boat 1989 regal 3.7 MerCruiser engine alpha one. When I got to the ramp we put in the water now previously I ran it in the driveway and it ran nice and clean started up clean and ran very smooth. When I got to the ramp we put the boat in I started the boat A lot of black and blue smoke came out and it smelled like gasoline I said well that’s strange that never happened before I let it run for a few minutes and we headed out. This is where this becomes a two-part problem. I lowered the L Dr. thinking I was in deep water gave it some gas and I heard some knocking and grinding I stopped I did this two more times panicked thinking it was the outdrive but then realize like an idiot even though I was about 50 yards out I was still shallow light damage to the prop occurred. After I realize I was a deep enough water I lowered the outdrive and gave it about 75% gas while about 40 seconds into a good clean smooth run all of a sudden it hesitated and stalled I then restarted it it ran for about 20 seconds stalled started again it ran for about 25 seconds stalled finally I said let’s just idle back into the dock that only lasted about six minutes to where it wouldn’t even idle anymore. The next day the boat started up fine but again lots of black smoke lots of steam coming off the backend I also noticed that not a lot of water was coming out of the exhaust area now I’m wondering if it was just burning up there is warm water coming out but not like it used to when I ran the boat in the driveway what should I start doing my main concern is winterizing the boat and dealing with this garbage in the spring I’m thinking of taking the lower unit off but I’m wondering if I should bother because again with the muffs on there is a little water trickling out of the exhaust I also noticed that the engine is running a little rough as if it’s running on three cylinders instead of four but I checked all four cylinders are running . I think my main concern is to get this thing running for about 10 or 15 minutes get it winterized and then store it but I need some advice why all of a sudden is this thing not sucking up a lot of water because I put the old drive in a big big giant blue bucket and before if I stopped feeding water to the bucket you could see the water level go down now you don’t also there is a slight knocking in the old drive maybe I’m being paranoid. That’s a whole lot to swallow right now any help would be greatly appreciated I’ll reply best I can again
 

karayj

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Aug 4, 2002
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468
If anyone knows a trick as a back up plan on a 3.7 on how to winterize it without an out drive that would be helpful to just in case I run out of time and it gets too cold this morning it was 38° Oh I forgot to mention I notice when you lower the outdrive that rubber boot that goes over the exhaust when you lower the outdrive it doesn’t cover it it really doesn’t cover that exhaust pieces until you’re all the way down is that normal I’m thinking if you trim up a little bit what is the exhaust girl let me know if that’s a concern because when I run it now it seems a lot louder than it did before
 

Lou C

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Nov 10, 2002
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please use paragraphs! your posts are un-readable!
the black smoke, sounds like you got a stuck float in the carb or a leaky inlet needle. Not hard to fix if you know carbs
the running hot, you probably damaged your impeller running it in the tub, the water needs to be well above the drive water intakes to allow the impeller to prime. Replace impeller
Don't 3.7s have a closed cooling system? If so all you have to do is drain the raw water side (exhaust manifold, raw water hose that leads up to heat exchanger, etc).
 

Bondo

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please use paragraphs! your posts are un-readable!

Ayuh,..... 'n start yer own threads, insteada hy-jackin' somebody else's,.....
 

Scott Danforth

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If anyone knows a trick as a back up plan on a 3.7 on how to winterize it without an out drive

drain the raw water side of the system and change engine oil....... Poof..... You are winterized
 

karayj

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Aug 4, 2002
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468
I knew there must be a way and to think I almost paid some one $125.00 to do this for me THANK YOU SCOTT!! I have a cooling map so I know what needs to be drained. I will take the hoses off so the water is not tapped any where and the outside and evaporate any I missed. When did run it at home the "bucket " is a 2 gallon 4 foot dia bucket , I was well above the inlets at all time, rabbit ears make me nervous.
Now I have figure out what my outdrive wont come off. I was trying to look at the impeller and took off all the bolts and yes it is in forward gear. The is a Knocking ticketing noise I can feel and hear on the out drive above where the impeller would be. I"m wondering when the prop was hitting bottom those 3 short times I ruined the outdrive aka impeller shaft.I may buy a used unit or is there something I can look for? Bent shaft ?
Sorry about the paragraphs was on my cell phone and was using speech to text.
 
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Scott Danforth

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Never try to run an outdrive from a bucket. You toasted the impeller.

Always use muffs

You would need to get the water-line to almost the top of the drive to prime the pump in a bucket. So the bucket has to be big enough to put the whole boat in

Raw water pumps can not self prime, they just burn up the impeller

So now pull your drive apart and replace the whole pump assembly

And hope you didnt run for more than a few seconds without cooling water, or you burned the flapper and rubber exhaust hoses. You may have also overheated if you ran about 2 minutes trying to suck from a bucket
 

karayj

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Any help with the lower unit not coming off ? it seems seized to the upper portion or the outdrive. I mentioned in the previous post I heard and felt a tapping ticking in the upper region left side of the outdrive that cannot be good. what does the shaft of the lower unit or impellar pump shaft connect to?
Oh I don't have drain plugs for my freshwater supply like I have seen in some videos, I guess I should just remove all fresh water hoses that I can find ?
 
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Scott Danforth

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why not follow the procedure in the factory manual?

the lower may be corroded on.
 

karayj

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I followed the manual NO JOY / New option I can buy an outdrive 150.00 my question is my ration is 1:84 the seller has a 1:81 will that be ok ? I raly think I toasted mine and the knocking noise is the tell tale. I would rather replace it,
 

Scott Danforth

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you should have a 1.81:1 Alpha

I believe the 1.84:1 was an MC
 

karayj

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I thought I had an alpha one because of other people helping me all that I I know is it says 184 so I wanna make sure I get the right parts because I finally got it off and the impeller is destroyed.
I could give you a serial number
 

Scott Danforth

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the impeller was destroyed because you tried to suck from a bucket.

I would get a complete raw water pump with a new housing.
 

karayj

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I noticed the kits are $40 I can buy an used outdrive.
I noticed the kits are $40 I can buy a alpha one GEN two drive for $125 that the impeller was just done. So I ask again will a alpha one GEN two will that fit on my boat
My current hour Drive has a crack towards the front not affecting anything but there is a crack so I’m thinking am I better off just replacing the entire unit. I forgot to mention when I went to check the gear oil before I took it out on the lake it was about a quart low on gear oil that makes me wonder if there’s any other damage
 

Bondo

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Ayuh,..... An Alpha 1, Gen.II will not work on an Alpha 1 transom assembly,.....
 

karayj

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Thanks Bondo . I did google it and see the shaft is different on a Gen II and wanted to confirm that.
 

karayj

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Can someone tell me before I buy this Used alpha one outdrive for $150 which I think is a pretty good deal what I should look for when buying a used Outdrive
I don’t mind spending $150 on another one and putting a new impeller kit in and then keeping my other one as a spare.
I think there’s possible damage from that knocking noise I heard as I mentioned before
 

Bondo

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Can someone tell me before I buy this Used alpha one outdrive for $150 which I think is a pretty good deal what I should look for when buying a used Outdrive
I don’t mind spending $150 on another one and putting a new impeller kit in and then keeping my other one as a spare.
I think there’s possible damage from that knocking noise I heard as I mentioned before

Ayuh,..... There's not much you can inspect, without a tear-down,......

I'd think that a complete outdrive for $ 150. is a rebuildable core, rather than a ready to run outdrive,.....
 

nola mike

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Do you have a gear lube monitor on that boat?
drain the water by removing the aft plug on the bottom of the heat exchanger. That's the only way to do it. I've bought outdrives for $150 before that were fine. Pull the top cap and see if the bearings are pitted/rusty. Pull the bottom plug and check for milky lube/water. Make sure everything turns smoothly and that it shifts. If the buyer lets you pressure test it, great.
 
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