Air Blower pipes and Control Pod configuration

Hi,

I have a 79 US bus which I had converted to carbs from Injection. Following that the exhaust was changed and required the removal of the catalyst and the injection Heat exchanger in exchange for a conventional one. I noticed that the mechanic had not reconnected the air pipe that blows air from the engine bay through the heat exchanger and into the van. Also noticed that the old pipes from that fan were perished. These I have replaced, but cant get the last one into the heat exchanger as the Oil Cooler is in the way. There is another inlet hole and this looks like it is ideal for channelling this pipe through to bypass the heat exchanger, which appears to be feeding in anyway from under the oil cooler. I just wondered if this was a viable connection, any clues?

Here are some piccys:

New Air hose fitted from blower passing through tinware, but other side currently going nowhere.

Additional air inlet at junction point Near Side above Heat Exchanger

View of top of heat exchanger, oblong hole for Air in (I presume), but I cant get to it as Oil Cooler is in the way.

 

Yes, it's all a bit dusty, due to the recent resto lots of paint dust etc. Any recommendations on cleaning all the dust off would be great, I am making reasonably good progress with wet wipes.

 

Second pic is of the heater dump outlet, it is not an inlet, it is for the hot air to be removed away from the vehicle. Originally there was an extra bit of pipe that that bit joined on to. Look on ratwell.com for a diagram of how the 79 heat exchanger setup looks.

Not sure why your mechanic changed the hear exchangers, do you have before pics? And afters of the heat exchangers

 

Hi, I found this on JK and it looks like the Heater Control Pod. In the second image the outlet/inlet sits directly on top and appears to feed into it. How sure are you that it is a removal vent? The heat exchangers were changed to fit a non-injection exhaust. It was a bit DIY at the point where I took it in and some bits had to be cut off.

 

Here is the part I cant get to as it is hidden underneath the Oil Cooler (got this image from ratwell):

 

The tube is definitely a heat outlet, also known as a heater dump tube. On previous years the heat control valve had a mushroom type thing on it for hit air to escape when the valve to the passenger compartment /cab were shut. In 79 the changed it what you (and me) have, there would have been a short piece of cardboard tube attached to another metal part that would allow the hot air to exit near the back corner of the bus

 

For the side you have circled there should be a metal oval tube rising up through the tin ware and then the tube from the aux fan attaches to that

 

Do you have a pic of the old exhaust system? Was the attachment to the exhaust via trianglular mounts

 

my van also had the 3rd hole in the tinware in front of the fan housing and i could never work out what it was for, the normal right and left ones are the ones to connect the snail fan to, i blanked the 3rd one off with a paint can lid from a small tin of paint, there is no outlet/connection to the engine under it on mine near the oil cooler though - the image you highlighted off ratwell is the feed to push air with the fan, are you sure you have the correct tin/exhaust combo, my guess is you have a miss match of parts - what year is your van? what heads/exhaust outlets?

edit i just read it's a U.S 79 so should have the simpler exchangers - maybe the tinware in the van is wrong, do you have a top view? the hole for the pipe should be to the left of the spark plug rather than where you have the pipe.

 

Hi, There is no opening in the tin above the the outlet, it does have a circular indentation where it would be on the other tins I have seen (see photo). Maybe it's because it has an oil cooler there and therefore no hole as this would be right above the cooler. I don’t know if the tins are correct, but it kind of makes sense not having a hole there as it would be straight onto the cooler. I have no photos of the heat exchanger set-up before the the work was done. As for how it was, it is a 2l and the correct engine (CA) , the engine is a Laurie Pettitt build but I think it was fitted by the rental company I bought it from. It had the original injection system and the exhaust fed through the heat exchanger with the catalyst. The injection system was complete and working before I had it changed, I know that they are rare parts but I had a lot of work done on the back of them.
I had the change done to avoid being stranded in spain in need of a replacement 30 year old L Tronic injection part. And the engine is now much more accessible, I can understand it better, and it looks a whole lot less cluttered.

 

I have added a piccy of the left side, maybe this could be modified, but I still think it would have to go around the oil cooler.

 

Here is a pic of mine, it is possible to fit a hose through past the oil cooler, all type 4 engines have the oil cooler there.







Hope this helps you.

I have an indent where you have a hole and a hole where you have an indent!!!

 

You cannot fit that S shaped steel pipe running upwards from the top of the heat exchanger through the tin ware which connects to the flexy fibre pipe that takes it up to the snail fan.......without taking off the heat exchanger or top tinware .

 

This is the bit of pipe you have missing.



It goes from top of heat exchanger, over to the left, then up through that hole you have blanked off. The cardboard tube then fits on to this in the engine bay.

 

And as @Faust says, you have to take the HX off to fit it - discovered this much to my annoyance recently!

 

And these are the pipes that should attach to those extra holes on the heater control pods on a 79 for venting the heat out to the sides:

 

We also have those on our '78. They are, as you say, designed to take the heat away from the engine when you close the cab heating flapper box/heater pod vents in the summer.

 

I'd get creative with some semi rigid Aluminium ducting.....where there's a will.....

 

the "extention" heat dump pipes get the air further away from the starter to avoid hot start issues

 

Thanks Everyone, I now know what I need, and am just that little bit wiser. Cheers!