Pipes for fan housing

[fordescort1]

Still looking for a bay but most I have seen have the pipes from the fan housing blanked off or missing. Some don't even have holes in the tin wear for the pipes to go to the underside. What are they for and are they needed.
Cheers dudes

 

[RePhil]

They stop you getting earache :msn4:





They direct air to the heat exchangers on the underside where the air is heated. Ductwork then conveys the hot !! ? Air to the cab to keep you & passengers warm.

Thus preventing earache.

Phil.

 

[fordescort1]

Forget the earache bit, I get that anyway from the other half.
Do they have any effect on engine cooling, is it going to knacker the engine.

 

[gvee]

Some buses have heat exchangers, some have J-tubes.

Those with heat exchangers should have the tubes from the fanshroud, through the tinware to the exchangers.
Those with J-tubes do not require this connection. This means that the fanshroud should have the holes capped off (to stop blowing hot air in to the "cool-zone" of the engine (i.e. the engine bay) and similarly the holes in the tinware should be plugged for the same reason (to stop hot air from below rising in to the cool-zone).

 

[RePhil]

My tongue in cheek comment about heating also had a serious point.
Without a full setup you will have no heating unless you want to invest in an alternative, & probably expensive, heat source.

I agree with all George's points.

I would ask why are they missing in the first place.
If J tubes are fitted the tubes are not needed so blank them off.
If however you have heat exchangers, the pipes only cost about a fiver for a whole length. If the owner can't afford or can't be bothered to fit them then what does that say about their attitude to maintenance in general.
These are relatively high (regular) maintenance vehicles as I'm sure you know.

Another aspect of having the full heater tubes etc. being connected is that they can deliver smells to the cab. Petrol, oil & in the case of a leaking exhaust inside a heat exchanger, noxious fumes. Maybe something you don't want to demonstrate on a test run!

Phil.

 

[Happystamps]

The main problem with taking those pipes off is that folk often don't bother sealing up the holes in the tinware- means the hot air under the engine gets though to the fan, and you're trying to cool a hot engine with hot air- not good.
The other issue is as stated, if someone can't be arsed to replace some cardboard tubes, what else haven't they done?

 

[fordescort1]

Ok thanks for all comments.
What if no pipes, no holes in tin wear and carb hot spot pipes cut short???
Don't want something that is going to blow up.