Sterndrive Identification

[patzo]

Appreciate any help some of the experienced folks could offer on this.

I purchased a loose Sterndrive from a local boat shop that went out of business. So I have no way of tying this back to an actual boat or motor for further help.

This drive is shown in attached pics. I am thinking it is likely some form of a 280 or 290 but not sure which one or what ratio this might be. Can anybody assist as to exact match.

I have scoured the unit for tags but haven't found any.

Note the extra holes in attach points.

Thank you

 

[PatinIdaho]

290 i think. Take the front anode off from around the prop shaft and it will have the gear ration stamped there.

 

[patzo]

I have written down the following numbers off the unit. The one in the location around the dipstick: there is a 179 with a longer number below it 1101539227 There is an 87 stamped in a circle on the casting with dots around it in this location.​

THere is also a VOLVO PENTA stamp with numbers, hard to make out but I believe its 853005 FA1​

Do these numbers mean anything to anybody?​

How would I know what units this would be compatible with and possibly ratio?​

I'd post pics of numbers but apparently there is a 6 pic limit per post that I can't seem to overcome.

PatinIdaho, is that the silver ring around the prop shaft that comes off that would show ratio somewhere? I'm not the most knowledgeable on these so any more description would help. ​

Thank you, appreciate your help!!!​

 

[Scott Danforth]

looks like a 290. looks to be in good shape. looks like it was repainted.

 

[Maclin]

Take off the rear cover, pop it into gear and see how far the prop shaft turns with one full turn of the input. If too hard to tell, turn the input 2 times and "divide".

 

[patzo]

Please forgive my newness here but not sure which cover is the rear cover? Or how to pop into or out of gear? Are there multiple gears? Is there a reverse?

I am not an expert on these units, I am however very mechanical inclined so I am sure that I can accomplish what you are describing with a little better description of how to go about doing this.

Thank you

 

[Scott Danforth]

Shift cover at back of upper unit. Two screws, one you take out, one you just loosen. Once cover is off, you will see the shift actuator

 

[Maclin]

Shift cover at back of upper unit. Two screws, one you take out, one you just loosen. Once cover is off, you will see the shift actuator

^
What he said...

 

[patzo]

[FONT=&quot]I pulled the anode ring around the output prop shaft and didn't find any legible numbers there. Is it under the next cover? Seems like that would expose gearing and potentially unseal the unit? I pulled those bigger bolts out but that piece seems unmovable. Probably needs some sort of puller?

Regardless, I pulled the gear selector rear cover and shifted it in gear. Seems to shift into gear forward and reverse and neutral just fine.[/FONT]
[FONT=&quot]I measured that I need to turn the input about 1.625 turns (complete guess as to the exact number) to get about 1 turn on the prop shaft.[/FONT]
[FONT=&quot]So what does this mean?[/FONT]

 

[Scott Danforth]

turn the input shaft at least 5 times. my guess its a 1.78 ratio

the ID tag should be on the upper gear case just behind the helmet pin.

however since you dont believe its a 290, let me take it off your hands

 

[patzo]

Used acetone and wire brush on area around prop bearing and can't find any numbers.

Did turn the shafts more in an effort to make sure what the ratio is. It takes 8 input turns to get 5 Output turns. 8/5=1.6 so likely 1.61

Thanks for all the help!!!

 

[K-2]

No ratio 1.78:1 in single props or 290 and earlier.
1.78 started with DP-A1
I have 1.78's so I have it memorized now on what to look for .