How can I know what year engine my friend outdrive can fit?

[SankorLiu]

My friend has a old style alpha one outdrive. the length of shaft is 21.96mm. How can I know what year and model mercuruiser engine it can fit?

 

[nola mike]

My friend has a old style alpha one outdrive. the length of shaft is 21.96mm. How can I know what year and model mercuruiser engine it can fit?

Many? Most? What engines are you looking at installing? Certainly anything from 1980 or so and newer, and plenty of older stuff as well.

 

[SankorLiu]

Many? Most? What engines are you looking at installing? Certainly anything from 1980 or so and newer, and plenty of older stuff as well.

He bought from somebody else. But it cannot fit his engine. So he just makes it clear while selling to others

 

[achris]

The length of shaft is 21.96mm.

That's the old MC-1 inline engine yoke. Will only fit pre-1982 inline engines (120, 140, 165, 470).

But if you (or your friend) want to make it fit a later engine, or a V6 or V8, then just change the yoke...

The other thing you need to know is the ratio.

Chris....

 

[SankorLiu]

That's the old MC-1 inline engine yoke. Will only fit pre-1982 inline engines (120, 140, 165, 470).

But if you (or your friend) want to make it fit a later engine, or a V6 or V8, then just change the yoke...

The other thing you need to know is the ratio.

Chris....

Thank you Achris replying. Yes. My friend has a new style of outdrive, so he can change the yoke. What is the issue of ratio?

 

[achris]

Drives come is a number of different ratios.
Generally, V8s use a 1.5:1 reduction, V6s use either 1.65 or 1.84 and the GM 4 online use 1.98.

You can't put a 1.5 behind a 3L, you just couldn't find a prop small enough.... Or a 1.94 behind a V8 in a small boat, you'd need a prop bigger than they make....

Chris...

 

[SankorLiu]

Drives come is a number of different ratios.
Generally, V8s use a 1.5:1 reduction, V6s use either 1.65 or 1.84 and the GM 4 online use 1.98.

You can't put a 1.5 behind a 3L, you just couldn't find a prop small enough.... Or a 1.94 behind a V8 in a small boat, you'd need a prop bigger than they make....

Chris...

Yes. there is an issue of propeller

 

[nola mike]

That doesn't look like an mc-1.

That's the old MC-1 inline engine yoke. Will only fit pre-1982 inline engines (120, 140, 165, 470).

But if you (or your friend) want to make it fit a later engine, or a V6 or V8, then just change the yoke...

The other thing you need to know is the ratio.

Chris....

Pic looks like an alpha, no?

 

[SankorLiu]

That doesn't look like an mc-1.
Pic looks like an alpha, no?

Achris said it is alpha one old style

 

[achris]

No, achris didn't identify the drive, just that the yoke length corresponded to the yoke from an inline MC1...

The gear housing could be MR or Alpha One (look at the cav plate). And the drive shaft housing could be R, MR or Alpha One... (Only the serial number will tell which)

Chris...

 

[SankorLiu]

No, achris didn't identify the drive, just that the yoke length corresponded to the yoke from an inline MC1...

The gear housing could be MR or Alpha One (look at the cav plate). And the drive shaft housing could be R, MR or Alpha One... (Only the serial number will tell which)

Chris...

Hi Achris, What direction does the flywheel turn when we look at the sterm?

Clockwise or CounterClockwise, I am testing the outdriver if it can work or not

 

[achris]

Hi Achris, What direction does the flywheel turn when we look at the sterm?

Clockwise or CounterClockwise, I am testing the outdriver if it can work or not

Viewed from the stern looking forward, the flywheel would turn counterclockwise...

Chris.

 

[SankorLiu]

Viewed from the stern looking forward, the flywheel would turn counterclockwise...

Chris.

So the shaft turns in the CounterClockwise too, Is it correct? But the propeller turns in the Clockwise while forward, is it correct?

 

[achris]

But the propeller turns in the Clockwise while forward, is it correct?

Yes. In forward the prop turns the OPPOSITE direction to the engine...

 

[SankorLiu]

Yes. In forward the prop turns the OPPOSITE direction to the engine...

It seems that outboard engine is different from inboard engine.

 

[achris]

It seems that outboard engine is different from inboard engine.

About the only similarity between a 2 stroke outboard engine and a 4 stroke inboard is that they are both called 'engine'...

Chris...

 

[SankorLiu]

As your guidance I will switch the yoke. But how to take out the clip?

This video does not show clearly at 3:31. I can find the clip.

 

[SankorLiu]

I have done the testing following,

1: I checked it if work with my bellow house
2: checked it if work with my propeller,

No 1 and No2 are my old parts, outdrive with shorter yoke is old style.


what is next just changing the yoke. But I met the issue of taking out the clip

 

[achris]

I pop those clips out with a couple of screwdrivers. Put one on the end of a clip. Push the clip off the joint from the other end with the other screwdriver.

 

[SankorLiu]

Are we going to damage the clip by pushing? After all it is made of metal. it is not flexible.