WHAT is this leg

Grew 194 · Sep 9, 2012

Ok I need to replace gimble and I have been told this is Alpha 1 and then was told pre alpha so Now I don,t know what it is and don,t want to buy the wrong part for the wrong model so can you tell me what it is . first of all the boat is a early to mid 70,s Grew 194 and is powered by merc 165

Don S · Sep 9, 2012

Re: WHAT is this leg

It's a Mercruiser 1 drive. (MC-1). No such thing as a Pre Alpha.
Go to this link for even more ID info. http://forums.iboats.com/showthread.php?t=329915 scroll down to the pictures.

Bondo · Sep 9, 2012

Re: WHAT is this leg

Ayuh,.... It's an MC-1,.... Alphas didn't come out til '83/ '84...

thumpar · Sep 9, 2012

Re: WHAT is this leg

It is not an Alpha. Could be an R drive.

Grew 194 · Sep 9, 2012

Re: WHAT is this leg

great thanks for the info I found a # on the out drive housing 3351310 and the one one gimble is 55894

Don S · Sep 9, 2012

Re: WHAT is this leg

Did you look at the link I posted?

Grew 194 · Sep 9, 2012

Re: WHAT is this leg

Yes Don
I thank you very much now I just have to find the parts to fix it the gimble is very sloppy leg moves up and down with about 1 inch of movement and back and forth with 2 inches of movement this measurement was taken at the trim tab plate

Grew 194 · Sep 9, 2012

Re: WHAT is this leg

Also Don
A guy up the road from me has a Sangster with a 4 cylinder mercruiser with the same out drive will this work on my 165 mercruiser?

Don S · Sep 9, 2012

Re: WHAT is this leg

If that 4 cylinder is a 120 or 140, no it won't work on your engine. You need a 1.65 ratio, the 4 cylinder is 1.98.
Now if that 4 cylinder is a 470................

thumpar · Sep 9, 2012

Re: WHAT is this leg

I am curious what the thing coming of the top cover is. It looks like it has an air hose fitting on it. I have never seen that before.

Don S · Sep 9, 2012

Re: WHAT is this leg

thumpar said:
I am curious what the thing coming of the top cover is. It looks like it has an air hose fitting on it. I have never seen that before.

Read this thread he has in boat topics. http://forums.iboats.com/showthread.php?t=577803

thumpar · Sep 9, 2012

Re: WHAT is this leg

Ahh. I was wondering why the hell there would be an air hose connector on there.

Grew 194 · Sep 9, 2012

Re: WHAT is this leg

Don S said:
If that 4 cylinder is a 120 or 140, no it won't work on your engine. You need a 1.65 ratio, the 4 cylinder is 1.98.
Now if that 4 cylinder is a 470................

so the plate that the gimble is bolted to has a differant bolt pattern to the block? it,s just the gimble I need the leg unit seems to be good on mine

Don S · Sep 9, 2012

Re: WHAT is this leg

I'm not sure what you are calling a plate and a gimbal. No such thing as a "gimbal" on the back of your boat.

Grew 194 · Sep 9, 2012

Re: WHAT is this leg

Don
gimbal housing and ring is what I am talking about

achris · Sep 9, 2012

Re: WHAT is this leg

Anything 1966 to 1990 are interchangeable at the 'major assembly' level. What Don's talking about as not suitable for your engine is the internal ratio of the gears. Physically, if would bolt up, but the different ratio will make the propeller the wrong size, so a change of prop would be needed, if the right size prop exists..

Chris....

Don S · Sep 9, 2012

Re: WHAT is this leg

You need the proper ratio in the drive for your engine. If just changing a prop was all that was needed, the drive manufacturers wouldn't make so many different gear ratios. Props need to be in the 17" to 23" pitch range for best over all performance. You get there by changing gear ratio's.
That is why you can take a 19" pitch prop off a 3.0L engine with a 1.98 gear ratio and still get great results when used on a 5.7L engine with a 1.50 gear ratio. And have proper WOT rpm for both engines.

Grew 194 · Sep 9, 2012

Re: WHAT is this leg

ok so getting back to my first question the boat up the road has the same out drive as mine( MC_1 ) and I can use the gimbal ring and housing ? but not the leg unit

Don S · Sep 9, 2012

Re: WHAT is this leg

Without knowing exactly what the "one up the road" has, I wouldn't bet on everything being exact. It's the little details that can throw a wrench into the works.
Why are you replacing the gimbal ring and gimbal housing?

Bondo · Sep 9, 2012

Re: WHAT is this leg

Grew 194 said:
ok so getting back to my first question the boat up the road has the same out drive as mine( MC_1 ) and I can use the gimbal ring and housing ? but not the leg unit

Ayuh,.... Probably, but no guarantees....

WHAT is this leg

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