Expansion tank query

[crazy uncle gray g]

The reason I am a bit persistent in asking is that Mike at Wheelquick told me that particular tank is definitely from a 2.5 diesel. Somebody is wrong.

Just a thought, but who's to say that the tank that came out of that 2.5 diesel hadn't already been removed from a different bongo, say a 2 litre perhaps?

[widdowson2008]

The reason I am a bit persistent in asking is that Mike at Wheelquick told me that particular tank is definitely from a 2.5 diesel. Somebody is wrong.

Just a thought, but who's to say that the tank that came out of that 2.5 diesel hadn't already been removed from a different bongo, say a 2 litre perhaps?

Very distinct possibility - owt seems to be possible with a Bongo

Just taken another look at the original pics - where could that lump of grot (if thats what it is) come from? bloody big piece of crud to be swilling around the cooling system.

[mikeonb4c]

hi, are the divisions actually cross braces to stop the exp tank swelling under pressure/heating.things like this are fitted to large fuel/oil tanks to brace the sides so the manufacturers can make them thinner.

Good point Ady.

I've been wondering what happens in the parts procurement world. If Mazda issue a specification that a header supplied for use in the Bongo assembly must meet, and if they have more than one supplier (quite possible), then different suppliers might still each adopt different manufacturing techniques. Out of interest, are there any identifying details on the header tank that might be compared with other header tanks?

Mister Munkey is probably clutching a cold Crabbies and howling with laughter at the intensity of this debate

[Doone]

Sorry Steve, I haven't asked hubby about this, as our paths have not recently crossed when we are both awake.
I found THIS interesting article on the web, it doesn't answer your question but it's interesting reading.

[mikeonb4c]

Sorry Steve, I haven't asked hubby about this, as our paths have not recently crossed when we are both awake.
I found THIS interesting article on the web, it doesn't answer your question but it's interesting reading.

What a great find

It looks as though it may answer the baffles question, as it says (amongst other things):

The baffled tank is an expansion tank with three chambers or baffles. This tank design allows the thermal fluid to efficiently cool as they are separated through chambers that prevents co-mingling of hot fluids. Thermal systems normally have a heat transfer loop, baffle expansion tanks aim to decrease the degradation rate of thermal fluid due to oxidation.

Could this be what the fuss is all about?

Still no idea what the valvey thing is though

[Doone]

Whoever split the tank open and passed the photos to Steve may have a pretty good idea what it is. It's always easier if you can see the actual thing.

[widdowson2008]

Sorry Steve, I haven't asked hubby about this, as our paths have not recently crossed when we are both awake.
I found THIS interesting article on the web, it doesn't answer your question but it's interesting reading.

What a great find
It looks as though it may answer the baffles question, as it says (amongst other things):
Could this be what the fuss is all about?

Still no idea what the valvey thing is though

True - a brilliant find
What fuss is that Mike? No fuss here - just fun

Did you notice the bit.......'Mazda expansion tank designs vary on the type of engine fluid held for specific year, model, and make of vehicle applications' Does this re-open up the 'valvey thing' for further digging? It certainly looked like a 'valvey thing' to me (love that phrase - good un Mike)

[widdowson2008]

Whoever split the tank open and passed the photos to Steve may have a pretty good idea what it is. It's always easier if you can see the actual thing.

Who produced the pics? TGP. He mentioned that he had a tank and I asked him if he would split it so we could see inside - just out of curiosity.
He sent the pics posted (pretty good quality pics too), and later sent some real close-ups.

[The Great Pretender]

I think the tanks secondary purpose is expansion and degassing the primary function. This would help make sense of the 'maze' of sections and the different size connections. The small 'thing' that sits in front off the small pipe is NOT a valve and not meant to move.

[mikeonb4c]

I think the tanks secondary purpose is expansion and degassing the primary function. This would help make sense of the 'maze' of sections and the different size connections. The small 'thing' that sits in front off the small pipe is NOT a valve and not meant to move.

Thank gawd I stuck to the vague expression 'valvey thing' then

[widdowson2008]

I think the tanks secondary purpose is expansion and degassing the primary function. This would help make sense of the 'maze' of sections and the different size connections. The small 'thing' that sits in front off the small pipe is NOT a valve and not meant to move.

Are you saying that it actually SHOULD be there? Cos if you are, you know what the next question is going to be don't you?

[bobngo]

WIDDOWSON , i,m abit late with this (been in hospital ) but

"YOU WERE ONLY SUPPOSED TO BLOW THE BLOODY DOORS OFF"

think about it ???

[widdowson2008]

WIDDOWSON , i,m abit late with this (been in hospital ) but

"YOU WERE ONLY SUPPOSED TO BLOW THE BLOODY DOORS OFF"

think about it ???

Still a classic

ME? - Not me guv

Hospital? Nowt too serious I hope.

[The Great Pretender]

I think the tanks secondary purpose is expansion and degassing the primary function. This would help make sense of the 'maze' of sections and the different size connections. The small 'thing' that sits in front off the small pipe is NOT a valve and not meant to move.

Are you saying that it actually SHOULD be there? Cos if you are, you know what the next question is going to be don't you?

Yep..............a question you shouldn't be asking, think jiggle pin............

[mikexgough]

Yep..............a question you shouldn't be asking, think jiggle pin............

Mikeob4c will no doubt have some wild theories on why it needs a jiggle pin......