replacing a 305 with a 350 engine

[mrostkow]

From: Nautica Marine Services → Engine Main Page ↓

Thanks Ang'elique!

So if I google the number on the upper housing or the outdrive I can find out if it is a n Alpha I, II, or III?

SERIAL NUMBER LOCATION​

‘‘ The Engine Serial number is located near the starter at the Flywheel housing, the Rocker Arm or Flame Arrestor Cover.

The Sterndrive Serial number is located on the Upper Driveshaft housing Starboard side or on the Back of the housing.

The Transom Serial number is located on the Upper part of the Transom Assembly. ’’

Where it says ‘‘Sterndrive’’ in red in the drawing, that's often called ‘‘the leg’’, meaning the part going down.

 

[Angélique]

So if I google the number on the upper housing of the outdrive I can find out if it is a n Alpha I, II, or III ?

Yes, you can do that, and you can also post here what you find, as it might be a lead to further info from someone, and maybe - PAR - Gonzo - Barry - know from the pictures already.

 

[mrostkow]

Yes, you can do that, and you can also post here what you find, as it might be a lead to further info from someone, and maybe - PAR - Gonzo - Barry - know from the pictures already.

Yes, I will do that - however I really was hoping one of you more experienced fellas could identify it bythe pic...;-)

 

[Angélique]

Yes, I will do that - however I really was hoping one of you more experienced fellas could identify it by the pic... ;-)

I'll consider it very well possible that the fellas I've earlier mentioned are able to identify it by the pics, just wait for them to show up, and what they have to say . .

Just the age alone might exclude some types already, I didn't dig into that, the others might know from the top of their head . .

 

[gonzo]

It's an Alpha.

 

[Angélique]

Now we like to know the № I, II, III thing Gonzo . .

 

[PAR]

That is an Alpha 1, non- second gen. drive leg.

 

[mrostkow]

Now we like to know the № I, II, III thing Gonzo . .

Wow you guys are great! thanks!

 

[PAR]

Wow you guys are great! thanks!

Please email my other half and tell her . . .

The easy trick is the trim cylinders. If they're bolted to the leg, it's a early Alpha 1 (gen 1), but if it has "C" clips, it's the Alpha 1 (gen. 2). Gen. 1 drives also have a dip stick in the cap, but gen. 2's have a hose going back to the gear lube monitoring system.

 

[gonzo]

Now we like to know the № I, II, III thing Gonzo . .

The first type was simply called "Alpha". Later on, when the Alpha II came out, people started referring to it as Alpha 1.

 

[Angélique]

Thanks for the info Gonzo, didn't know that about the Alpha, although it occurs more often that the market comes up with an affix to identify older types, which from the factory go without, like in the below example . . .

- - - the ‘‘ quote ’’ comes from the bottom of the first link - - -​

TARTAN 34 C: ‘‘ S&S Design No. 1904. The letter "C" has been adopted on the used boat market, "Classic", identifying it as the first 34 from Tartan. The second TARTAN 34, which is also a S&S design, is commonly referred to as the TARTAN 34-2. ’’

The T 34 first generation owners association also uses this by the market conceived affix.

 

[Carolina Fishing]

Ha. I never knew Gen 1 drives had a dip stick on the cap. Mine had so much paint on it you couldn't see it!

 

[Carolina Fishing]

So if I google the number on the upper housing or the outdrive I can find out if it is a n Alpha I, II, or III?

There is no Alpha III.

Before "Alpha" there was MC-1.

Another way to tell Gen 1 or Gen 2 apart is to take a photo from the side.

Gen 2 has the back of the skeg at an angle. On Gen 1 it is straight.

 

[Barry]

According to the Merc site, there is only the Alpha One series drives (WITHIN THE ALPHA SERIES)
Alpha One ( without a Gen notation) from 83- 90
Alpha One GenII from 91 and up to a cut off at 1997
Alpha One Gen II from 1998 and up

Mercruiser Sterndrives | Mercruiser Alpha One | Stern Drive http://www.sterndriveconnections.com/mercury_stern_drive.php
Above link a supplier for outdrives

You tube of the difference

EzPartsWeb https://public-mercurymarine.sysonline.com/Default.aspx?sysname=NorthAmericacompany=GuestNA_KEY=NA_KEY_VALUElangIF=englangDB=eng
Mercury marine, OEM parts catalog.

 

[Ian Schilf]

Hello everyone, I figured I would not start a new thread for this as it is just another step in this process that I hope you all can help me with.

I am in the process of "rebuilding" a 305 for a coworker's boat. I was just able to get it just about all torn down to just the block. The reason for this teardown is that the engine was not winterized correctly and cracked the block on both sides (just above the engine mounts). The block is a complete loss and at this point, I think it might be better to just find a 350 and put the intake, fuel pump, exhaust manifolds, and other marine specific things on the replacement engine. That all being said, on another site I am reading that some of these engines were designed to run reverse of a car engine, as well as the marine cam is different than a car cam.

The boat is a big old cabin cuddy (I'm a high school shop teacher, not a marine person)? Has a Mercruiser of some type. If I get a different engine do I need to figure out the other firing order to achieve reverse running, and change the cam as well? I know I am asking a lot with almost no information but hopefully, someone can help me.

Thank you,

Also, who would I talk to about OMC sterndrive things? I made a mistake and bought one a couple years ago...


Thank you again,

Ian Schilf