mercury racing lower unit alloy grade.

[Fast Freddie]

I can look for that info tomorrow if that isn't too late.

[Guest]

Alcoa

Here is some info on a380.

http://www.krdiecasting.com/pdf/Sect3.pdf

Alan

[Fast Freddie]

356 t6

The 25XS/44XS gear cases were cast of 356 T6.

[lcp8410]

356 T6 alloy

fred, any suggestion what is suitable filler to tig weld these alloy?

[Smitty]

I'd be afraid that post-weld heat-treating might distort the gearcase enough that the machining would no longer be true. If you're just welding a new tip to a broken skeg, maybe just a 175-200F preheat would do (and maybe FWIW have a propshaft and bearings in place and a cone torqued down, if you are having to weld close to the bulb).

[Larry M]

I have welded skags on by submerging the whole unit in a pan of water with just the skag sticking up. The body of the unit will stay cool. It takes a lot of heat as a lot of the heat transfer will go to the water. I have also made up a dummy cartridge and tightened up the cone to help hold it form distorting as much. I have a D merc unit we have been running for years with a lot of welding on it to make a hatchet type unit.

Larry Mac

[ram95]

Better give Alan Akerstrom a call 978-692-5224, He can repair your merc gear housing.

[krazy karl]

I had one welded to fix a broken skeg. It failed at Top O' after about 5 miles on the first day. The top bearing seized, I figured it was from distortion due to the welding. Dave loaned me a 102 to run the second day.
kk

[trident]

Welded Skeg

I have had several welded over the years, D Quicky, both 55H and 44XS, and SSM 6, with never, ever a failure... Won Nationals with welded skegs.

If yours failed at the skeg and it was distorted all the way to the top bearing, you don't need an alloy number, you need a skilled welder. Don't use the guy who did this ever again.

Jerry

[Dave M]

Agreed

I agree with Jerry. We have welded a good many skegs over the years. If one failed, it was poor welding. I have completely reshaped a gearcase skeg for superior handling charateristics, and that was under a SEH, or 850CCH Mod boat. Can't beat one up much more than that. Even the Pro classes are easier on gearcases than that.

[hustler_race_product]

Mercury Lower Unit

I am looking for a dood merc unit to put under my super E if anyone has a good one they want to part with PM me. Thx