Identifying lower unit

[Flying fish]

Tough crowd, just trying to figure out what motor this lower unit is from (per thread title) Since it has a standard prop shaft I figured that a standard Yamaha prop will fit it but, since the water pump kit that fit is from a Dx model motor I wasn't sure if I some hybrid of lower unit.

[boscoe99]

You are over thinking this. There are no hybrid lower units.

I gave you information as to how to inspect your lower unit to determine what model type it was originally used on. I think the answer, should you choose to do the inspection, will disclose that it is a conventional gear case. That is, if it uses on only one propeller.

Better still, why not take the motor to a Yamaha dealer and ask him to install the correct propeller for you?

[99yam40]

Tough crowd, just trying to figure out what motor this lower unit is from (per thread title) Since it has a standard prop shaft I figured that a standard Yamaha prop will fit it but, since the water pump kit that fit is from a Dx model motor I wasn't sure if I some hybrid of lower unit.

interesting thought.
Are the cases the same with different guts so someone could slap in standard guts?

Never mind the cases are a totally different

And why would the water pump be different on a DX from a standard?

But it is looking at the part #s

[boscoe99]

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[Flying fish]

Yes , this was fun finding the right water pump the first time I changed it.

[Flying fish]

Yes , this was fun finding the right water pump the first time I changed it.

Wonder how much a new lower unit would be? But this lower unit was running great before I lost my prop. And now I know which water pump to buy that solves that maintence chore. But it still would be nice to know

[rodbolt17]

the DX had TWO prop shafts and TWO propellers.
very similar to a DPS Volvo or a bravo3 mercrusier.
its also a beast to replace a gear set in.

I have only had the chance to work on 2 DX cases.
no more .

[Flying fish]

Any idea which lower unit I have? It looks just the dx unit but has only one prop and fits nicely on my px150

[rodbolt17]

if it only has ONE prop shaft its is NOT a DX.
and I think the above diagram is wrong.
that's the plate and seal assy for an F250 style lower.all that PX stood for is Pro series OX66.

its normally a 20" shaft.

[Flying fish]

After looking at every parts diagram I found a similar lower unit, it looks like the b115tlrx lower unit looks just like the one on my motor. I assume a b115 and a px150 are similar enough for this to work? Both 1999

[99yam40]

might check on the gear ratios

[rodbolt17]

v4 and v6 did use a different gear ratio and in some cases different pump kits.