Pinning Your Carrier

[JWTjr.]

I made some for Aero a couple of years ago.
The ones I made were one piece,meaning all 4 washers were part of a ring that slipped in from the rear. The idea was that the ring,which fit snug inside the carrier AND the case would help to keep the case round.
I dont know if the screws break or back off but I always seemed to loose the screw (and the fancy washer) in the 10 o'clock location.
The aluminum ones are kinda bulky. They will work fine if all you use are over hub props and have open exhaust, The one I'm using now is made from stainless. Its much thinner,wont interfere with the prop hub and causes less exhaust restriction. They can all be made with a built in blowout ring.
I've been using the stainless one for 2 years now and havent lost any screws yet
the first 3pics are aluminum, the last 2 are stainless

Very nice! You should see some action on these...nice work,

John

[Instigator]

I made some for Aero a couple of years ago.
The ones I made were one piece,meaning all 4 washers were part of a ring that slipped in from the rear. The idea was that the ring,which fit snug inside the carrier AND the case would help to keep the case round.
I dont know if the screws break or back off but I always seemed to loose the screw (and the fancy washer) in the 10 o'clock location.
The aluminum ones are kinda bulky. They will work fine if all you use are over hub props and have open exhaust, The one I'm using now is made from stainless. Its much thinner,wont interfere with the prop hub and causes less exhaust restriction. They can all be made with a built in blowout ring.
I've been using the stainless one for 2 years now and havent lost any screws yet
the first 3pics are aluminum, the last 2 are stainless

Nicely done! Very impressive. Exhaust restriction was one of my issues w/the individual spacers. To get them big enough to be effective they created a fair amount of exhaust restriction.

Rat, doesn't matter. The later carriers don't even have the O-rings.

[Tony Brucato]

I made some for Aero a couple of years ago.
The ones I made were one piece,meaning all 4 washers were part of a ring that slipped in from the rear. The idea was that the ring,which fit snug inside the carrier AND the case would help to keep the case round.
I dont know if the screws break or back off but I always seemed to loose the screw (and the fancy washer) in the 10 o'clock location.
The aluminum ones are kinda bulky. They will work fine if all you use are over hub props and have open exhaust, The one I'm using now is made from stainless. Its much thinner,wont interfere with the prop hub and causes less exhaust restriction. They can all be made with a built in blowout ring.
I've been using the stainless one for 2 years now and havent lost any screws yet
the first 3pics are aluminum, the last 2 are stainless

Nice work!

[Gorilla0178]

So thanks instigator, i did this mod in about 10 min, the question i have is does it need to be pinned in 4 places or is 2 places 180 degrees apart good enough. I only did 2 for now as i hate to drill more holes than necessary.

[rude tim]

I use grade 8 fine thread screws with locking nuts, I have not had a bolt break since I did it this way. Use the green hi temp lock tite and the will never come loose. Paint it after you finish and rust is not a problem.

[Action Dave]

So thanks instigator, i did this mod in about 10 min, the question i have is does it need to be pinned in 4 places or is 2 places 180 degrees apart good enough. I only did 2 for now as i hate to drill more holes than necessary.

I only have 2 on my current case. My previous case had 4. I think as long as you check them often to make sure they're tight, you'll be good to go. I got lazy on my old case and the pins came loose. The carrier dug a groove into the side of my old housing which eventually turned into a huge crack.

[Instigator]

I've always done four and guess one potential issue in my mind would be alignment. By using four it keeps from walking better than two and would not be trying to stretch the carrier as two could possibly due.
I have a system/routine in building mine and part of it is the torquing sequence of the four bolts.

[1BadAction]

Excellent write up Gary, we need more posts like this on here. I'll be doing my V4 this weekend, probably isn't going to need it, but it doesn't hurt to have a little extra insurance.

[Smoking Joe]

A brilliant report Gary, thanks for taking the time to share it with us.

[Smoking Joe]

I made some for Aero a couple of years ago.
The ones I made were one piece,meaning all 4 washers were part of a ring that slipped in from the rear. The idea was that the ring,which fit snug inside the carrier AND the case would help to keep the case round.
I dont know if the screws break or back off but I always seemed to loose the screw (and the fancy washer) in the 10 o'clock location.
The aluminum ones are kinda bulky. They will work fine if all you use are over hub props and have open exhaust, The one I'm using now is made from stainless. Its much thinner,wont interfere with the prop hub and causes less exhaust restriction. They can all be made with a built in blowout ring.
I've been using the stainless one for 2 years now and havent lost any screws yet
the first 3pics are aluminum, the last 2 are stainless

Fantastic work Loop, if you get some inquiry for your "washers", please put my name down for two. What a great idea and great workmanship. Please consider a production run.

[baja200merk]

My nylock never melted in the 7 yrs and 10x more hrs then that racing boat joe Must be a 12in mid problem?

[champ201]

Won't last.

Wow, haven't responded to a thread since I sold the boat, but here's my experience. Drilled @ 4 locations, tapped all the way through the housing and carrier. Ran 1/4" ss bolts inside to out (through carrier, then housing) with a lock washer, then ground down bolt threads flush with the housing. It looked real clean, ran it for 10 seasons/200+ hours and just tightened them every once in a while (which wasn't often). The engine was approx. 250hp on a heavier hull and normally ran in fairly sloppy water. Never sheared a bolt.

[baja200merk]

I have seen 6 pins put in an older case. The 4 usual pins then 2 more at 3 & 9 o'clock that were drilled and tapped into the horizontal part of the carrier.

My cases only have the 4 pins, and I have NEVER not once had a gear case failure. I have pulled 5ft of fishing line out of the propshaft seals and had to change the water in that one about every time out (costal 90W ) then did the seals but I have never had a case fail.

[Action Dave]

I've never had an internal issue with my cases either. Housings and bearing carriers, I haven't had luck with but all my internal parts are still original.

[JTM]

Great infromation on the lower unit...