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Need to find volvo penta dp lower unit gear ratio

K

kgafgen

New member
hi there
i got a volvo penta

hi there
i got a volvo penta complete duo prop sterndrive unit from the bellhouing out on ebay last week.
but im trying to find out how to find the lower unit gear ratio.
on the top of the upper unit has nothing there/or it is worn off so that spot is no good to find any info.
i was told it was from an 1988 v-8 motor
is there any other place to check for the gear ratio ?
or any other way to count the gears ?

thank you for your time
 
"1) Align one of the prope

"1) Align one of the propeller blades with the skeg and make a mark on the blade tip where it lines-up with the skeg.

2) Mark the driveshaft u-joint yoke and line it-up with a reference mark you make in the outdrive housing.

3) Turn the driveshaft until the mark in the propeller lines-up again with the skeg and count how many full turns and approximate hundreds of a turn you have made with the driveshaft. That's your gear ratio. For example, if you had to make 1.89 turns in the driveshaft to make one full turn in the propeller, the gear ratio would be 1.89:1.

Clear as mud?"
 
"Kevin, if your DP is similar

"Kevin, if your DP is similar to mine, take the props off and look on the lip of the gear housing.
BZ"
 
hi there
El Pescador
im sorr

hi there
El Pescador
im sorry my dad took the 1988 v-8 volvo upper/lower
duo prop unit apart allready
is there any way to check the lower gear ratio now ?

thank you very much for the info

also Bobzilla thank you for the info also
i checked it and there is nothing there.
 
also El Pescador
would you k

also El Pescador
would you know the gear ratio
for an 1988 290 volvo penta duo prop
with an 350 v8 motor
it was a dual sterndrive set up
im sorry if im saying it rong
im a newbe to this.

thank you very much
 
"Kevin, you can do the same th

"Kevin, you can do the same thing with the unit apart if the gears and shaft are still in place: turn the vertical one complete turn and see how many turns does the prop shaft turn.

If you have access to the gears, count the teeth in the prop shaft gear and divide that figure by the number of teeth in the vertical shaft gear.

I think the 290 in your last post will likely have a 1.95:1 ratio."
 
hi El Pescador
i check it and

hi El Pescador
i check it and it was just alittle shy of two turns
so i guess it is an 1.95:1

thank you
 
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