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AN INTERESTING OBSERVATION

fan blows air forward through radiator!

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Ken McWilliams

11-14-2001 04:04:05

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I've been putting back together the rebuilt G-148B engine in my CASE 310D. When adjusting the valves, I looked at the fan and assumed the fan draws the air though the radiator. Then, according to my observation, I began rotating the crankshaft looking at the valve movement sequence and discovered that I was turning the engine backwards! Afterwards, I went over to my other CASE 310 crawler, and saw that it, also, has the reversed fan blades.

These are the first machines that I've owned that pushes the air through the radiator and out the front.

Other than blowing hot air in the direction of the operator, my question is: why does it push the air out the front, rather than draw the air through the radiator and blow backwards?

Is there another reason other than keeping the heat away from the operator?

If keeping heat off the operator is such an important feature, why don't more equipment use the reverse flow fan blades?

I suppose in the days when these CASE crawlers were being used in the construction trades, putting a canvas shroud around the engine to keep the operator warm in the winter wouldn't have been an option.

Do other crawlers or equipment use the forward flow fans like this?

From my own experience operating farm equipment, there have been times I wished that the hot air was blowing in some other direction than on me when mowing or cultivating on a hot & humid summer day for hour on end.

Ken McWilliams
Dayton, OH

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dumbdon

08-23-2006 11:45:58

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Re: AN INTERESTING OBSERVATION - fan blows air for in reply to Ken McWilliams, 11-14-2001 04:04:05

Fifty years ago when I was working for A-C at the Springfield, Illinois crawler tractor/motor grader plant in the engineering design department, I remember one of the early radiator failure problems was the "Sandblasting" of the radiator. This was most frequent when the crawler was equiped with a front end loader or dozer and working in material that put a lot of dust and sand into the air.When this dirt was "sucked" thru the radiator it tended to sand blast the radiator core and result in coolant leakage requiring radiator replacement. The problem was less severe with a blower fan probably because the air moving thru the radiator was cleaner than that in front of the crawler grille. There may have been other reasons. As I remember, at A-C, the choice of fan was usually an option with the buyer. There may have been some models with certain mounted equipment where the "Blower" fan was standard unless otherwise specified.

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Celeriac

11-19-2001 17:05:47

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Re: AN INTERESTING OBSERVATION - fan blows air forward through radiator! in reply to Ken McWilliams, 11-14-2001 04:04:05

Our International TD20 loader has a blower fan. The blower fan is great for blowing twigs and such into the radiator if you don't have a screen or side curtains. Probably would not be a problem out in the open.

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Randy

11-21-2001 01:50:28

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Re: Re: AN INTERESTING OBSERVATION - fan blows air forward through radiator! in reply to Celeriac, 11-19-2001 17:05:47

Caterpillar has had reversible fans for years. You push air in the hot summer, and pull
the warm air off the engine in the winter.

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Farmer-Gene

11-16-2001 01:48:25

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Re: AN INTERESTING OBSERVATION - fan blows air forward through radiator! in reply to Ken McWilliams, 11-14-2001 04:04:05

My D-7 came with both fans, I was told that the pusher fan was for fighting forest fires so it wouldn't blow the flames and hot cinders on the operator. I use mine mainly in the fall and winter so I installed the puller fan on so I would stay warmer.

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Poppin' Johnny

11-15-2001 16:02:24

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Re: AN INTERESTING OBSERVATION - fan blows air forward through radiator! in reply to Ken McWilliams, 11-14-2001 04:04:05

Ah, this must be one of those options. Some Farmalls had this. Sucking the air though the front is where most of the dust, chaff, ect is. In the rear, there is much less, so it won't clog up.

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Andy

11-14-2001 20:38:01

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Re: AN INTERESTING OBSERVATION - fan blows air forward through radiator! in reply to Ken McWilliams, 11-14-2001 04:04:05

I run a cat D8H and it has a reversable fan. I let it blow out the front in the summer, and reverse it on me in the winter.

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Max

11-14-2001 20:08:23

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Re: AN INTERESTING OBSERVATION - fan blows air forward through radiator! in reply to Ken McWilliams, 11-14-2001 04:04:05

Case used to have three fan blade options, push, pull, and the Huber. I used to go out on warranty service calls to remove the front fan cover on the Huber, clean out the dirt, reinstall the cover, and turn the blades for push. Like the above post, it was amazing how much heat was taken off of the operator with the push fans.

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Mickey

11-14-2001 18:40:35

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Re: AN INTERESTING OBSERVATION - fan blows air forward through radiator! in reply to Ken McWilliams, 11-14-2001 04:04:05

My Uncle used to run dozers, and he would use the fan to help start burning the brushpiles, if they were hard to set afire.

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hyoder

11-14-2001 17:26:32

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Re: AN INTERESTING OBSERVATION - fan blows air forward through radiator! in reply to Ken McWilliams, 11-14-2001 04:04:05

I used to know several operators that whould run the fan pushing out the front in the summer than turn them around for the winter

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hyoder

11-14-2001 17:26:23

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Re: AN INTERESTING OBSERVATION - fan blows air forward through radiator! in reply to Ken McWilliams, 11-14-2001 04:04:05

I used to know several operators that whould run the fan pushing out the front in the summer than turn them around for the winter

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Growzerbar

11-14-2001 07:25:52

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Re: AN INTERESTING OBSERVATION - fan blows air forward through radiator! in reply to Ken McWilliams, 11-14-2001 04:04:05

Hi, Ken, Have read a lot of your posts with great interest, sorry about the job loss, glad we don't suffer that same neggative feelings here, about the older people, but , that is not in response to your query; Most, if not all, of the track equipment in this area are equiped with a reversable fan, I believe they are made by "Huber", each individual blade is pushed in against a spring, turned, and released, to change the direction of pitch. A lot of equipment can be equiped with a non-reversable fan, like yours, such as skid steer loaders etc, to keep the heat away from the operator, [warehouses]?...

We use this pimarily for "creature comfort", not only to get rid of heat, yes it gets dang hot here in summer, but, when working in dusty conditions, or tucking in burning brush piles, to keep from sucking in sparks and flames. Also works for cleaning the trash out of the radiator.

When I was young and stupid,[still stupid], before the days of reversible fans, I operated an HD19 Allis Chalmers, pushing buggys, this outfit was equiped with the diesel torque, so the fuel tank was always quit hot, with no reversable fan, and no canopy of any kind, it was like sittnig in a furnace, would have given my left ----- -- for a Huber fan!

Hope this sheds a bit of lite on the subject for you, have a gooder, R.E.L.

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Ollie

11-14-2001 05:02:44

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Re: AN INTERESTING OBSERVATION - fan blows air forward through radiator! in reply to Ken McWilliams, 11-14-2001 04:04:05

D-2 Cats had a fan option, you could get one to push or pull. They were more for keeping the radiator from packing full of dirt and trash than operator comfort. Don't know if the Case had both available or not...

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Scott

11-14-2001 19:09:36

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Re: Re: AN INTERESTING OBSERVATION - fan blows air forward through radiator! in reply to Ollie, 11-14-2001 05:02:44

International Harvester used a reverse fan on their '88 series tractor. Air entered from top of hood.

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tom

11-15-2001 12:11:47

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Re: Re: Re: AN INTERESTING OBSERVATION - fan blows air forward through radiator! in reply to Scott, 11-14-2001 19:09:36

John Deere also used a reversed fan on the early 3300/4400/6600/7700 combines (pre rotary screen} The air entered the front of the engine compartment.

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