Hi everyone
I recently cracked the cast iron fitting that screws into my old Yanmar diesel upstream of the salt water cooling pump. It cracked where the 90 bend (stainless steel) attaches to the fitting. I had it braised but hasn't fixed the leak.
Same old story $200 plus for a new one. It has been suggested that I could go to the plumber shop and get galvanised fittings that will do the job.
There is an anode fitted in the end of the old fitting that I think will screw into the gal fitting ok.
Would there be issues with dissimilar metals?
Thanks
Tony
Brazing is adding a different metal to the mix anyway. If you can get straight plumbers bits to do the job that's fine. Its always a good idea to do a visual on the engine regularly before shutting down and being aware of what to keep an eye on. If this is for the anode to screw in, it should last if you keep up with the anodes.
Myanmar !!!!! Dam new tablet has predictive dictionary turned on.
Speaking of the new tablet, this is the one ALDI had on sale for $169 +$20 for the leather case, car charger and ear phones.
Then there was the 32gb micro SD card for $25 and I bought the ALDI $5 mobile starter pack and the $35 Unlimited Bolt On ,
(UNLIMITED calls within A us + 5gb data); YES it is a phone as well with a 5mp camera on back and web can on front.
So we are up to $254 so far, then we add a $13.99 Google store download of the Avionics App for the whole of Australia, NewZealand, Norfolk Is. and Chatham Is., we are now looking for a waterproof case which can be bought from Whitworths for about $40.
For just over $300 anybody can have the smickest (ability to edit charts with your own observations including photos), quickest (download charts for they whole of Aus, NZ in about 3 hours ) and slickest (full featured, ie layered vector charts where extra detail is added as you zoom in which is not a feature of raster charts).
Yes this is off topic but these tablets are quite amazing. Cheers Cisco.
And here I was thinking it's the new way to spell Yanmar, silly me.
Also off topic, I too had one of the Aldi 8" tablets but took it back for refund as it had to many problems with installing some apps. While I could have rooted the device I thought why should I, the damn thing is supposed to work straight out of the box without me having to fix it.
A mate and I both bought one each and have had no problem with them. Maybe you should have gotten an exchange.
No, the device was working fine, but quite a few of the apps I was trying to install wouldn't do so because the signatures on the installed certificates didn't match. It told me to uninstall the program and upgrade it, but the problem is that the offending program was installed in the root to which users don't have access unless you root the device. As I believe that I shouldn't have to fix faulty firmware in order to get it working correctly it had to go back. So back it went.
Ah well, that is getting a bit techy for me. When you said "root it" I thought you were talking about hurling it against a brick wall. 
I really only bought mine for it's GPS and to install Navionics on it which works fine.
It's use as a phone and web surfer are a bonus for me. I did install Sky Gamblers Rise of Glory WW1 fighter game on it which is interesting in showing the graphics and processing capabilities of the device.
I have been looking at available apps for it but have not come across much that would be really useful to me.
Can you recommend any apps as "must haves" but obviously not those you found would not work?
This is the Whirlpool Forum dealing with the Aldi 8" tablet ....http://forums.whirlpool.net.au/forum-replies.cfm?t=2142051
A couple of apps that I quite liked that did work were "Shazam Encore v3.11.1" which is a great toy for identifying unknown songs and tunes, you just hold it to the speaker and let it "listen" and in no time flat it has identified that tune. Another nice useful app that I like is "TuneIn Radio Pro v8.0" a radio app that lets you listen to radio stations from all over the world, a bonus is that you can also listen in your local police channel and see what the boys in blue are up to.
A good spot to avail yourself of these and more apps without the tedium and cost of the google app store try this site .......
www.apkmania.co/
just make sure that the file you download ends in .apk, then copy it to your SD card and install from there.
Hi fellas
Don't mind yus hijacking my thread, really interesting on the tablets. Might be some people missing out though because they don't give a rats about dissimilar metals!
After getting the old cast fitting braised twice and it still leaking (grrr) I have made up a fitting out of a combination of plumbers bits, gal 3/4" tee that screwed into the motor ok. In the other end the anode fitted nicely (with a bucket load of thread tape!) . The top of the tee has 2 brass nipple reducers to fit the stainless 90* bend that the hose fits on.
Should have taken a photo! So have galvanised metal ( so called), brass and stainless. Any thoughts on hazards here??
Will keep a close eye on it. Have run the motor for about an hour with no leaks. But am more concerned with corrosion and eventually not being able to get the bloody thing apart.
Cheers.
Tony
No hazards as such, just that your fitting is going to fall apart eventually, just like the original did. Now that you have three dissimilar metals they are all going to be at differing electrical potentials, I suspect your brass is going to fail first followed possibly by the stainless next. It may be worthwhile to tie them all together with a grounding wire to the rest of the motor. By tie, I mean electrically not with knots.
Select to expand quoterynot55 said..
Hi fellas
Don't mind yus hijacking my thread, really interesting on the tablets. Might be some people missing out though because they don't give a rats about dissimilar metals!
After getting the old cast fitting braised twice and it still leaking (grrr) I have made up a fitting out of a combination of plumbers bits, gal 3/4" tee that screwed into the motor ok. In the other end the anode fitted nicely (with a bucket load of thread tape!) . The top of the tee has 2 brass nipple reducers to fit the stainless 90* bend that the hose fits on.
Should have taken a photo! So have galvanised metal ( so called), brass and stainless. Any thoughts on hazards here??
Will keep a close eye on it. Have run the motor for about an hour with no leaks. But am more concerned with corrosion and eventually not being able to get the bloody thing apart.
Cheers.
Tony
You have five (repeat five) dissimilar metals in an area of high turbulence of sea water.
1. Cast iron engine block.
2. Galvanized fitting. Steel and zinc!!
3. Brass reducers.
4. Stainless elbow.
5. Zinc anode.
Will you have galvanic action?? Yeees!!.......Will it be an ongoing problem?? Yeees!!
The QM series Yanmars are a great engine and could serve you for 50 years or more properly maintained, though they are a bit dated now so parts may be hard to obtain.
Yanmar came out with the series in the early 70's (73 or 74) as a departure from their previous slow revving under square (long stroke, narrow bore, high torque) engines to this series as a high revving dedicated marine propulsion engine where high torque is not an issue. They are a square engine (same bore and stroke), have a high compression ratio of 25:1, yet retain the fairly simple and robust construction of the previous series.
My first advice was "That particular fitting on a Myanmar is quite important. I would buy a new one."
I hold to that but in the meantime while you are hunting one down (if you can find them buy two) I would go back to the galvanized fittings with a nipple (thread, hexagon, thread or thread pipe thread) screwed into the block, then a reducer/expander to the next size up, an internally threaded "T" piece, another reducer/expander down to original size and then a threaded barb or pipe for your water hose. Then get a threaded bung for the open part of the "T' piece and drill and tap it to take a zinc anode.
You can introduce the water on the 90 or 180 degree of the "T" piece with little difference to the waterflow, to best suit the room you have and positioning of seacock etc.
Doing this you will only have 3 dissimilar metals and you will have closely duplicated the original fitting. I would use "Stag Jointing Paste" rather than teflon tape or if you must use tape get the good pink plumber's tape.
While you are making this lot up, make a second one and toss it in your tool box for a spare. A great place to buy these kinds of fittings can be your local farmer's irrigation shop. Farmers are notoriously tight with their money so you should get the right prices there.
Back off topic:- I really love my Aldi Tablet and Navionics App.
PS:- What design is your yacht and how many cylinders is your engine???
Select to expand quotecisco said..
Doing this you will only have 3 dissimilar metals and you will have closely duplicated the original fitting. I would use "Stag Jointing Paste" rather than teflon tape or if you must use tape get the good pink plumber's tape.
Cisco, I've seen the "Stag jointing paste" at auto shops and seem to recall that it can withstand hydrocarbons such as petrol and diesel.
So that sounds pretty good.
Since you've used it, can you tell us whether it goes HARD when it sets?
And if it does, does it make it difficult to undo metal pipe threads and metal fittings screwed on to them with Stag?
Does applying moderate heat (eg. soldering iron or hot air gun) help to loosen a Stag joint?
Great stuff Stag. Do it up with it and it dries hard and don't let go easy.
I have seen rotten fittings break before the Stag let go. As for heat, nothing less than a flame will affect it.
I wouldn't use it on fittings less than half inch nominal bore.
Stag is a jointing paste and does not really go hard, when you pull it apart the red stuff will still be soft. It used to be used a lot rebuilding engines before modern engine silastics came on the market.
I bought a Solo sailing dinghy a while back off this middle aged woman who replaced the ply deck and gunwales. She used Stag and monel nails! I can assure you Stag has no strength as a glue. The Stag is hard to remove off timber!
Thanks Cisco
What are the advantages of the stag over the tape?
I do use the pink teflon tape
It is a 3 cylinder . 3qm30.
The yacht is a 38' Temptress, ketch rig. 
Stag or teflon performance wise are probably 6 one, half a dozen the other.
Stag can be messy and does not seem to be as common these days.
Using Stag though you will almost always maintain an electrical contact between the assembled parts and that has to be a good thing.
The 3 QM 30 should be a great engine for your yacht. Smooth 3 cylinder running, about 900 cc cubic displacement giving great economy.
I doubt you will get 30 hp out of it but 25 hp any day of the week.
Talk to it, caress it gently, give it sweet tasting diesel and feed it's internals only with the finest quality oils. Bathe it regularly with kerosene and a good scrub then salve it's skin with Lanox Spray and a gentle wipe down with a babies nappy or your favourite T shirt moistened with some of it's sweet diesel and internal oils.
Do this and it will love and serve you forever.
Actually while not trying to disagree with Cisco I would recommend you keep to old style cheap engine oils of the correct grade. Avoid modern oils, especially synthetics. You may have to shop at tractor/farm shops.
Yes to all the above Cisco.....plus a battery that talks its same language and a continuous steady stream of cooling seawater and we are all happy sailers!! 
Select to expand quoteRamona said..
Actually while not trying to disagree with Cisco I would recommend you keep to old style cheap engine oils of the correct grade. Avoid modern oils, especially synthetics. You may have to shop at tractor/farm shops.
You are right but you no doubt realize I was waxing poetic and speaking figuratively.(Not even had a drink.) Always follow the manufacturers specs on oil.
I have been using Bimrose oils in all of my machines for over 15 years now and they just stop wearing out. Each of his lubricants is tailored for it's specific application.
He buys his base oils from the refinery but specifies filtering four times instead of their usual once and then modifies them with his own formulas of additives. I just don't use any other oils unless unavailable. Then I only use Caltex Havoline. Be wary of some of the Mobil oils.
Click around his web site to find a local distributor.
www.bimrose.com.au/
EDIT:- Just had a look. You will have to move to Queensland if you want to protect your machinery with Bimrose lubricants.
There are certainly some good advices on his web site anyway. The farmers and truckies love his oils.
Popped into Aldi earlier in the week...guess what I bought (hint: not dissimilar metals)
A motor bike helmet for $29.95???
I noticed in our local they had a heap of the tablet accessory packs on display which means the must have a heap of tablets still out the back.
My mate with one with the Aldi SIM and phone deal has just had his land line disconnected and wants me to buy his laptop.
