270 leg switching to 280

[-JR-]

I have a chance to buy a 280 leg for $100. Might be a good idea if my 270 ever fails.
What is the difference ,and will it just bolt in where the 270 was .

My engine is a AQ125
running in a 19 ft 1984 Bayliner

 

[PatinIdaho]

I believe it should bolt on and work providing it is the same gear ratio and has the same input shaft splines also both the steering helmet pins will need to be the same. Single bolt or double bolt

 

[jeffnick]

In addition to Patinldaho's observations which I have found to be true, I might add:

I have a 250 for my V8. I'm guessing my drive is from the late 70's. I bought another 250 for a spare but it's for a 4 cylinder so the lower 3rd of that drive (blue bottom) won't work.
http://72land-n-sea.blogspot.com/2014/01/volvo-penta-aquamatic-outdrive-stand.html

Then I bought a 280 from a V8 as a spare and it looks like it will bolt right up (both the 250 and 280 drives have the single helmet bolt). Worst case, if the spare is the same ratio, you can use parts of it if you need them.

One thing I did notice is that the 280 takes a flapper in the bellows instead of the external flapper on my 250 (270'smay also have a flapper at the exhaust outlet). Lastly, unless your 270 prop shaft is tapped, you'll need a slightly different propeller mounting technique including a 280 line cutter and a cone bolt.
http://72land-n-sea.blogspot.com/2016/01/aquamatic-propellers-fitting-long-hub.html

The stand below was modified (made longer to take 2 drives) but here are the dimensions for the single.
http://72land-n-sea.blogspot.com/2014/01/volvo-penta-aquamatic-outdrive-stand.html

So now I've got all these spare parts (including a set of 6 cyl gears) which I've laid out $200 total for, and find these drives are pretty much bullet proof.

Bottom line - the spare drive @ $100 will give you peace of mind, but you'll probably never need it.


.

 

[PatinIdaho]

I assumed you were talking about switching the entire drive. If your only switching the lower you will also need to re shim the bearing fallowing the VP factory service manual.
The Volvo Penta exhaust flapper in the bellows is restrictive and needs removed. You can add a 290 style flapper to it easy enough as shown here.
http://baylinerownersclub.org/index...vo-penta-290-style-exhaust-flapper-to-a-aq280
With the proper Prop nut and spacer you do not need to tap the prop shaft.

 

[jeffnick]

Thanks PatinIdaho,

Wasn't aware of the 290 flappers until you mentioned it. Just picked one up on eBay for $20 - but I'll probably never need it as my 250 is doing just fine..