OMC V4 prop to fit a 3 cyl?

[steelespike]

Re: OMC V4 prop to fit a 3 cyl?

BRP #0390896 13x19

Is this said to be for a small gear case?

 

[steelespike]

Re: OMC V4 prop to fit a 3 cyl?

the 15" rim fits inside the gearcasing, about 1/4 inch or so it's a bit narrow at the rear of the prop. But your right with the 19" it just butts up aaginst the gearcase.

Are you sure the 15" prop actually measures 13 3/4" in diameter?
It just seems so big in relation to the small gear case props The largest 15" prop is 12 1/4" in diameter.

 

[jimmbo]

Re: OMC V4 prop to fit a 3 cyl?

Is this said to be for a small gear case?

It is for the V4 gearcase, you call it large, to me it is small. some of the other props listed are 13 3/8, 13 1/2, etc up to and including 14" dia. The small gearcase as you call it, can only handle small hub props up to 13' dia.

BTW I got that from the BRP website parts list.

 

[fishfeatures]

Re: OMC V4 prop to fit a 3 cyl?

ok so I measured both hubs, at the rear where they fit into the gearcase.

15" = 12 inches
19" = 12 1/2 inches


the half inch difference is the issue why it wont fit in . Can I get the prop machined to remove 1/2 circumference , say get a lathe to do it or something??

 

[jimmbo]

Re: OMC V4 prop to fit a 3 cyl?

ok so I measured both hubs, at the rear where they fit into the gearcase.

15" = 12 inches
19" = 12 1/2 inches


the half inch difference is the issue why it wont fit in . Can I get the prop machined to remove 1/2 circumference , say get a lathe to do it or something??

I think you measured prop diameter. Or are you measuring circumference of the hub?

Maybe a few pictures of the prop and the motor could go along way

 

[fishfeatures]

Re: OMC V4 prop to fit a 3 cyl?

I think you measured prop diameter. Or are you measuring circumference of the hub?

Maybe a few pictures of the prop and the motor could go along way

you can see the two different sizes , it's obviously the smaller one that fits into the gearcase, so if I could machine it down 1/2 an inch all round would that work???

 

[jimmbo]

Re: OMC V4 prop to fit a 3 cyl?

View attachment 158703View attachment 158704

you can see the two different sizes , it's obviously the smaller one that fits into the gearcase, so if I could machine it down 1/2 an inch all round would that work???

Without any reference to compare against, it is impossible to judge the size of what is in the picture. Pics of the whole prop, with it on the engine. hubs butted against each other, against a ruler/tape measure.

 

[fishfeatures]

Re: OMC V4 prop to fit a 3 cyl?

well it's dark and raining now so I'll post all that up for you tomorrow Jimmbo. cheers

 

[steelespike]

Re: OMC V4 prop to fit a 3 cyl?

It is for the V4 gearcase, you call it large, to me it is small. some of the other props listed are 13 3/8, 13 1/2, etc up to and including 14" dia. The small gearcase as you call it, can only handle small hub props up to 13' dia.

BTW I got that from the BRP website parts list.

I probably got careless with the term "large gear case" The 60 was thought to have the large gear case which I figured
was the size of the v4 gear case.It noe appears the 60 may have a small gear case.

 

[jimmbo]

Re: OMC V4 prop to fit a 3 cyl?

I probably got careless with the term "large gear case" The 60 was thought to have the large gear case which I figured
was the size of the v4 gear case.It noe appears the 60 may have a small gear case.

According to the BRP parts list. All the props listed for the 60 will fit the V4 case.
I guess there is a chance somebody swapped cases. but until our friend starts sending evidence to the contrary, I will say it has the V4 gearcase.

 

[steelespike]

Re: OMC V4 prop to fit a 3 cyl?

ok so I measured both hubs, at the rear where they fit into the gearcase.

15" = 12 inches
19" = 12 1/2 inches



the half inch difference is the issue why it wont fit in . Can I get the prop machined to remove 1/2 circumference , say get a lathe to do it or something??

Did you measure circumference? Or diameter?Did you measure from the center of the bore to the tip of one blade and double it"

 

[steelespike]

Re: OMC V4 prop to fit a 3 cyl?

According to the BRP parts list. All the props listed for the 60 will fit the V4 case.
I guess there is a chance somebody swapped cases. but until our friend starts sending evidence to the contrary, I will say it has the V4 gearcase.

If I remember right there is a 60 listed as small gear case 78 on.Highest pitch 17" at iboats.
also the 1990 60 hp large gear case props are the same number as the v4 motors.

 

[jimmbo]

Re: OMC V4 prop to fit a 3 cyl?

There was no 60hp in 1978, unless some oddball comercial unit, A 2 cylinder 60hp was introduced in 1980 that would have used the extra small gearcase. The 1990 brochure makes no reference to a small gearcsae and neither does Bombardiers website in the parts listing

 

[steelespike]

Re: OMC V4 prop to fit a 3 cyl?

iboats prop list 60 2 stroke,thru hub 13 spline "small gear case" 78 and newer.
Of course no indication 2 or 3 cylinder Also mentions 2 cylinder 80-85.you mentioned.
So I guess that leaves us with a "V4 prop" that isn't what it is claimed.

 

[fishfeatures]

Re: OMC V4 prop to fit a 3 cyl?

right guys , I have a spare gearbox so i put both props on it. with one prop measuring 12" and fitting in and the other measuring 12 1/2 and only butting up , I think I have to throw in the towel cause I don't think I have enough metal to machine down the larger one.

this is the 1/2 inch that won't ffit in



it should fill this space in the gearcase


but it only butts uup against it


I could try and use a lathe to take the 1/2 out of this but I don't think I have enough metal left


this is the spare with that 1/2 inch slotted in the case

 

[steelespike]

Re: OMC V4 prop to fit a 3 cyl?

I think it is time to bite the bullet with a good new prop.
I think it will knock 300 to 400 off the rpm probably add a touch of speed.
Without looking back I forget exactly what we were looking for.

 

[jimmbo]

Re: OMC V4 prop to fit a 3 cyl?

Are you smearing grease on the camera lens? Let's try something simple. You have a ruler. How about measuring the Diameter, that's diameter of the hub.