coolant flow - (follow up to cooling diagram)

[widdowson2008]

Having achieved (I think) an understanding and a diagram of the cooling system,
see http://www.igmaynard.co.uk/bongo/forum/ ... =3&t=35902

I'm now looking at the coolant flow within the system, including the engine.

I have produced, from information supplied in the above post, schematics of what I see as the various states in which the system can be. ie.Thermostat OPEN, CLOSED, and MIDWAY.

Thermostat Midway
If anyone could be of assistance on this side of the subject, I would appreciate some help.

[mikeonb4c]

Looking good there Steve

I'll keep out of the technical debate, but on the presentation side I think the closer the diagram can get to a top down view of an actual Bongo layout, with front of car at top of drawing, the easier it ought to be to follow as that is the convention that people are used to. In the main, that simply means rotating the diagram through 180 degrees, though I notice the header tank needs moving to the other side in order to be correct.

I would also do a bit more labelling of components (engine block, turbo, thermostat etc.) - labels around edge of diagram and with arrows pointing to component would do if that allows larger labels (ageing eyesight ) and/or helps keep the diagram itself free of clutter.

You might be able to put a few advisory footnotes on the diagram e.g:

*Label to header tank could say that fitting an LCA is advisable + where to buy

* Label to thermostat could advise that it fails in closed position, plus advising replacement as part of coolant change, if there is any doubt about its age/condition.

* Label to radiator could advise on known problems to check on (plastic around rad. cap can crack and leak, rad. can sludge up etc.)

* Best (i.e. standard position recommended by Haydn) position for fitting TM2 sensor probe could be shown, plus sugested range for 'normal' temps measured at that point

* Temp sender position could be shown, in case anyone wishes to access/replace/modify

Finally, a ghost outline of the vehicle itself (faint grey) would top it off nicely. It helps identify roughly where on the real vehicle the components are situated.

3D perspective drawing would be great and would allow pump and fanbelts to be shown 'as they are' but I imagine that's well beyond the capability of the drawing software/package so I'm just expressing sihful thinking here.

The suggestions above are all aimed at getting max. value out of the drawing. If the final product allowed people to understand how the system works, gain awareness of how to keep the system in good nick, and go to their car and identify the actual components, then it would be a comprehensively valuable diagram. Clearly there's a limit to what you can get on one diagram without cluttering it, but thats the fun and challenge of trying to design a really good drawing. I could see a really good final product being worthy of consideration for printing on decent paper as an A3 folded to A4 or A5 item, produced by the Bongo shop and offered for sale for use in conjuction with the workshop manual (or just as a thing of beauty and guidance in its own right). It would be the cherry on the cake of course if Mazda agreed to verify the diagram and its flow details as being correct (please Mazda )

Fantastic project - well done to you for tackling it

[dandywarhol]

I think it looks right Steve but the outlet from the engine should be from the head, not the block

[mikeonb4c]

Following mobilecats post on another thread, you could advise - against labels pointing to rad cap and header tank cap, some advice about checking these are in good condition and sealing OK as otherwise the system may leak under pressure (assuming the mechanical experts on here agree that is sound advice).

[widdowson2008]

Thanks for replies you guys.

The original project - 'cooling diagram' started life as quest to get a picture of which pipes were connected to which components. Purely a connection diagram. It developed into something approaching a 'physical' representation with components being 'geographically correct.
This one is the same. Got to get the connections right first. The problem I have here is that I have no idea what is inside the LUMP - the internal waterways - and its these I need to get correct FIRST and thats where I'm at currently.

Dandy - deliberate error to see if you were paying attention
You are talking about the engine to rad connection that comes out of the head? - where inside the head does it come from? Does it connect to the 'T' at (SPLIT 1)?

NOW FOR MIKE
1 - Schematic first and THEN the geography and subsequent tarting up. Can't paint it until its built.
2 - The sketch you see at the beginning of this thread is 1 of 9 (so far) - each one depicts a particular 'state' of the system - Stat open/midway/closed etc.
One of the sketches has all the individual components labelled, whilst another (in the planning stages) will identify each individual pipe by part number.
Where possible, it will also have photos alongside for easy ID. - Haynes fashion.

AND!!!!! I have an A0 plotter at home, so the whole thing will be up on Ians parts factory wall - BIG style. (prints available on request)

[dandywarhol]

Steve - it's the main red coming out of the engine on the opposite side to the thermostat - it exits from the head, one of the highest parts of the engine because the convection process lifts the hot coolant up to there.

[mikeonb4c]

Thanks for replies you guys.

The original project - 'cooling diagram' started life as quest to get a picture of which pipes were connected to which components. Purely a connection diagram. It developed into something approaching a 'physical' representation with components being 'geographically correct.
This one is the same. Got to get the connections right first. The problem I have here is that I have no idea what is inside the LUMP - the internal waterways - and its these I need to get correct FIRST and thats where I'm at currently.

Dandy - deliberate error to see if you were paying attention
You are talking about the engine to rad connection that comes out of the head? - where inside the head does it come from? Does it connect to the 'T' at (SPLIT 1)?

NOW FOR MIKE
1 - Schematic first and THEN the geography and subsequent tarting up. Can't paint it until its built.
2 - The sketch you see at the beginning of this thread is 1 of 9 (so far) - each one depicts a particular 'state' of the system - Stat open/midway/closed etc.
One of the sketches has all the individual components labelled, whilst another (in the planning stages) will identify each individual pipe by part number.
Where possible, it will also have photos alongside for easy ID. - Haynes fashion.

AND!!!!! I have an A0 plotter at home, so the whole thing will be up on Ians parts factory wall - BIG style. (prints available on request)

Excellent. I completely agree about getting the 'bare wires' connected up right first before wasting time building up other layers. My comments are simply a case of better said twice than not at all. I wonder if a print run of the finished product would be commercially viable for Ian - it would certainly be a handy item if it allowed peeps to:

"Understand it, find it, mend it, use it."

A verification from Mazda would top it off perfectly (note to self - must work on that one).

Mike

[widdowson2008]

I think it looks right Steve but the outlet from the engine should be from the head, not the block

Is this a little truer Alan?

Note query in cloud at top of image! "Where does this connect into head plumbing?"

Also made a couple of other mods

[dandywarhol]

There's a stub coming out the front of the head where the big elbow hose fits onto - ignore the swollen part - it's an anurism..................

[widdowson2008]

There's a stub coming out the front of the head where the big elbow hose fits onto - ignore the swollen part - it's an anurism..................

Just got back in from looking at mine (complete with pic) - However, got back in, saw your pic and ...... 'Every one's a winner' - you have just saved a trip to p/bucket - cheers

..........moving on.........

[mikeonb4c]

Note how swollen Dandys is

...he's since had it removed and got a new one

[widdowson2008]

There's a stub coming out the front of the head where the big elbow hose fits onto - ignore the swollen part - it's an anurism..................

Just got back in from looking at mine (complete with pic) - However, got back in, saw your pic and ...... 'Every one's a winner' - you have just saved a trip to p/bucket - cheers

..........moving on.........

at the risk of digressing, what's that small bore pipe in your pic - the one marked 'pipe to pump from turbo hose' I know what it says, but what does it do?

[dandywarhol]

Thats from the turbo boost connector on the inlet manifold and goes to the fuel pump diaphragm to give extra fuel during boost

[widdowson2008]

There's a stub coming out the front of the head where the big elbow hose fits onto - ignore the swollen part - it's an anurism..................

Sorry to bother you again
....... from a schematic point of view, what point within the circuit does this connect in the head internally.

(You do realise that I have a degree, with honours, in 'pestering' folk )

[dandywarhol]

Never seen inside a Bongo head but would imagine the coolant will circulate around the combustion chamber/valve area and then out the head to that hose - Allans may be able to tell otherwise...............