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Author Topic: Southern Cross ETB diesel engine  (Read 2245 times)

ajaffa1

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Re: Southern Cross ETB diesel engine
« Reply #45 on: March 21, 2019, 09:08:52 AM »
Hi Guys. looks like I need to make a miraculous recovery or nurse Glort is going to hunt me down!  :laugh:

I didn`t get much done today buy I did go to visit my old mate Tom the tractor collector. Here are a couple of photos of what he does for fun.

Also a couple of pics of old stationary engines he is willing to part with.

Bob

ajaffa1

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Re: Southern Cross ETB diesel engine
« Reply #46 on: March 21, 2019, 09:12:27 AM »
I also picked up a nice little piston pump which I will be fitting to the ETB when it is finished.

glort

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Re: Southern Cross ETB diesel engine
« Reply #47 on: March 21, 2019, 10:06:35 AM »

Nice little Pump.
Last time I was at my Uncles place at Casino he had one of those on a petrol Lister rusting away in the Paddock.  Think they were well gone past redemption but he seemed to think they were fixable.

I have been for a ride on one of those Field marshal tractors. 10litre single Cylinder. Talk about thumpers! Did a vid with my go pro but it wasn't very good. Not much you can do to steady the vibrations of one of those things!

I see there is also another southern cross there with a gen head on it.  Interesting......   ;)

Some men have all the good toys!

ajaffa1

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Re: Southern Cross ETB diesel engine
« Reply #48 on: March 21, 2019, 12:33:08 PM »
Hi Glort, the Field Marshal tractor is an amazing beast, single cylinder horizontal diesel engine. It can be started with a hand crank alternatively it also has the facility for a cartridge start, just like early aviation engines. You drop the cartridge into a hole, screw down the cover and then strike the firing pin with a hammer, bang, and away she goes.

If your Dad still has some of those little piston pumps hanging around let me know. I`m pretty sure I`ll get them going, this one is all steel brass and cast iron and corroded solid, what could go wrong?

Not a Southern Cross, sadly, but it is a 4 HP petrol Cooper engine, nearly as desirable. It has the original cast iron base plate and a cooper/sunbeam 32 volt generator head. It is intact except for the magneto and fuel tank, it is also seized. Tom wants $340 for it, which is what he paid for it ten years back. I would love to own this myself but think that it would take a lot of time, money and enthusiasm to restore. I still have some enthusiasm but not much of the other two. I`ve dropped a couple more photos of it at the bottom of the page.

Bob






ajaffa1

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Re: Southern Cross ETB diesel engine
« Reply #49 on: March 22, 2019, 10:51:06 AM »
Hi guys, In did get a bit done today, piston and con rod cleaned, balance weights cleaned, made new replacement tab washers for big end bearing caps and balance weights.

I have a dilemma, (please see photos) if you look at the big end bearing cap it has a locating pin to keep the white metal bearing in place. I have two sets of ETB78 new old stock white metal bearings, the locating holes are different on the two options I have available. One set of bearings lines up with the joint between the con rod and the cap while the other set is offset so the bearing joint is parallel with the piston skirt. I am thinking to go with the second option. Anyway what do you guys think?

Bob

ajaffa1

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Re: Southern Cross ETB diesel engine
« Reply #50 on: March 22, 2019, 10:55:32 AM »
Sorry Gents posted the wrong picture you need this one to make a sensible choice.

Bob

oldgoat

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Re: Southern Cross ETB diesel engine
« Reply #51 on: March 22, 2019, 12:53:33 PM »
Looking at the photo of the 32v generator it looks identical to one i have but it has a Westate plate on it.   I'm wondering who made these and stuck the appropriate tag on it for the various buyers

sirpedrosa

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Re: Southern Cross ETB diesel engine
« Reply #52 on: March 22, 2019, 07:01:46 PM »
Hi Bob

I think the correct set is that is offseted, and parallel with skirt, or as we see perpendicular to con rod. But this engine is only to showoff, not to loads, so it can take any set. IMMO.

Cheers
VP

PS: By the way, have you find a suitable injection pump an injector?
« Last Edit: March 22, 2019, 07:09:28 PM by sirpedrosa »
Bernard 18A - 1968 (mama's water pump - year of my birth)
Petter PAZ1 - Jun 1967, 3HP, sn 416xxxx

mike90045

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Re: Southern Cross ETB diesel engine
« Reply #53 on: March 22, 2019, 08:04:14 PM »
>  Anyway what do you guys think?  Bob

Glad you asked !  I think you are awesome

>   a bit done today, piston and con rod cleaned, balance weights cleaned,
> made new replacement tab washers for big end bearing caps and balance weights.

That would take me a month to figure it all out ....

ajaffa1

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Re: Southern Cross ETB diesel engine
« Reply #54 on: March 22, 2019, 11:00:28 PM »
Thanks for the support Guys. I think I will go with Pedrosa and use the off set bearing so the joint is perpendicular to  the crankshaft. If it causes any problems I still have the other set available and can swap it in about a half an hour.

The old piston is a little corroded but shows very little sign of wear or scoring, the piston crown is a very unusual design and has a small chip out of it. (see photo) I am going to take it down to my local sheet metal worker and ask him to fill the dent with his tig welder.

I have found a guy called Len who lives in Toowoomba, where this engine was originally made. He has most spares available including fuel pumps and injectors. I will probably have to make the fuel pipes myself. I am hoping he can provide me with new piston rings. Failing that I  will have to go through the catalogs and try to find a suitable set from a lawnmower or motorbike.

Bob



glort

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Re: Southern Cross ETB diesel engine
« Reply #55 on: March 23, 2019, 04:11:38 AM »

I have never seen a piston with a Raised Piece like that. Generally anything with some sort of redirector for the fuel is either sunken or in the head like mercs have on their IDI engines.

Just the clearance that necessitates to the lower part of the Piston from the head is amazing.
Do you know what the comp ratio is Bob?

dieselspanner

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Re: Southern Cross ETB diesel engine
« Reply #56 on: March 23, 2019, 07:35:40 AM »
Hi Bob

If the engine will run on without repairing the piston I'd be inclined to leave it alone.

Whilst there's every chance the repair will hold, if it does detach it's self (incompatibility of metals, thermal shock and stuff like that) a chunk of metal flying around the upper cylinder is going to play the cat and banjo with the valves and bore.

'swot I fink, anyway......

Cheers
Stef
Tighten 'til it strips, weld nut to chassis, peen stud, adjust with angle grinder.

ajaffa1

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Re: Southern Cross ETB diesel engine
« Reply #57 on: March 23, 2019, 09:24:37 AM »
Hi Guys. Thanks Stef I was thinking of leaving the piston as is and see how it goes. So you just saved me having to buy the local sheet metal worker a sh1t load of beer, guess I owe you a couple now! I do have access to a new piston if this one causes problems.

Hi Glort, there is no mention of the compression ratio in the manual, however there is an oil filler plunger into the intake manifold which raises the compression ratio on start up. so I am guessing at somewhere around 17 to 1.

The piston crown is pretty radical, as is the cylinder head (photos attached). This is very advanced engineering for an engine that was first made in the early 1950`s and must have been designed in the 1940`s. There are no locating pins or dowels in either the block, cylinder or cylinder head, so the only alignment between the piston up-stand and the hole in the cylinder head comes from the 5 cylinder head bolts. That might well explain the dent in the piston. I will try to upload the PDF manual so you can get the overall view.(I have had trouble sending PDF files before)

I also discovered why this engine was taken out of service, the exhaust port was coked completely solid. I suspect that the piston rings were worn and burning oil choked things up good and proper, I did wonder about the valve guides but they appear to have minimal wear. Perhaps they were burning crude oil or something similar.

Bob

Willw

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Re: Southern Cross ETB diesel engine
« Reply #58 on: March 23, 2019, 04:50:52 PM »
Hi Ajaffa1, I buy hard to find piston rings from this guy in Greece. He sells them by bore size and ring thickness, and I have had good service from him.

In his Ebay store click on "cylinders, pistons, mufflers" then click on" individual piston rings". You can choose based on your old rings, and if necessary repair a worn ring groove by purchasing a  thicker ring, them widening your worn ring groove in a lathe to match the new ring.

He advertises rings from 19mm to 450mm. That's 3/4 inch to 18 inches. That's some range :o

https://www.ebay.com/itm/Piston-Ring-Set-for-BRIGGS-STRATTON-76-2-mm-3-000-499921-391669/170915005624?epid=1400654809&hash=item27cb5404b8:g:grcAAOSwjKFZOb5u&frcectupt=true

sirpedrosa

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Re: Southern Cross ETB diesel engine
« Reply #59 on: March 23, 2019, 09:57:49 PM »
Hi Bob

+1 to Stef, I'm with him.

And I think there is nothing fancy with that piston, because from what I have studied and researched, the ancients spent much time studying things in detail.

I think the geometry of that piston was studied for the way of expansion of the combustion at the moment of injection, so that the pressure in the cylinder head does not cause stress in the metals.

Bob, you're restoring an engine that was dead, the small gaps will be the only thing that will allow it to work. You just want it to work, not the maximum speed.

My Bernard has the intake valve with a brutal axial clearance, so I know I should not squeeze with it.

Good work, keep on.

Cheers
VP
Bernard 18A - 1968 (mama's water pump - year of my birth)
Petter PAZ1 - Jun 1967, 3HP, sn 416xxxx