Installation of Lower Unit?

77SceptreOB · #1 09-14-2009, 12:12 PM

How difficult / complex is it to install a new lower unit on a Yamaha 225 (V-6 Excel)??

My current LU is shot and need a new one. I can buy a new one for appox $800 that has a 3 year warranty.

Is this install a DIY job or one for the dealer/marina/shop??

wtenglish · #2 09-14-2009, 01:32 PM

I haven't personally installed a lower unit but I watched the mechanics replace one on a Yamaha 250 Saltwater Series after it crapped out on the way to the Bahamas two summers ago. To the best of my knowledge it only involved removing about 4 bolts and sliding it off. After that experience I wouldn't have any reservations about trying it myself if I was in your position. One thing I would need information on would be the proper lubrication level in the unit itself.

Bigshrimpin · #3 09-14-2009, 02:20 PM

It's an easy job with 2 people and not too bad solo (if you use a ratcheting tie down strap).

Greno · #4 09-14-2009, 02:42 PM

just remember to have the shifter in the same gear as the lower unit. I have done one yamaha and my mechanic said to make sure it was either fully in forward or reverse while installing, making sure the shifter was the same. its not hard, just 4-6 bolts and the cooling hose. Don't forget to change the impellor while it is apart.

Eric

77SceptreOB · #5 09-14-2009, 04:29 PM

Quote:

Don't forget to change the impellor while it is apart.

If I get a new lower unit, doesn't it include a "new" water pump/impeller??? I thought it would be part of the assembly.

Greno · #6 09-14-2009, 05:25 PM

Depends. The guys I know that rebuild them do not put a water pump on if you bring it to them. It is just a few bolts and few dollars. May want to ask when you buy it.

Old'sCool · #7 09-14-2009, 05:45 PM

You drop/install a lower unit every time you change water pumps. I do my Yam 250 alone and the shifter splined shaft, pitot tube, and drive shaft must be aligned. It literally falls into place when correct. Run it on the hose and shift from f-n-r to be sure. It's definately not something a shop has to do. I use anti seize on bolt threads, rubber boot, and split line at assembly. Make sure it's full of gear oil...

nestorpr · #8 09-21-2009, 01:42 AM

There's a short article on this in the new issuw of Boating magazine.

77SceptreOB · #9 10-07-2009, 03:02 PM

Anybody know how many foot / lbs of torque needed when tighten the lower unit bolts when reassembling the unit.

I have a torque wrench, just need to know how tight to crank them down. God forbid over torqueing them and stripping them!

77SceptreOB · #10 10-14-2009, 03:16 PM

Quote:

Anybody know how many foot / lbs of torque needed when tighten the lower unit bolts when reassembling the unit.

Answer: 29 lb/ft (According to SEI's installation guideline)