Author	[Modern View]
NOXJohn 07-04-2012 06:55:11 184.5.161.74 Report to Moderator	I installed a pusher fan on one of my 1949 8Ns. This is my mower tractor. I mowed several days ago for around 3&1/2 hours when the temperature was around 85 degrees. It greatly improved operator comfort. However, it greatly increased engine head temperature. I have a temperature gage installed by drilling and tapping the boss on the left side of the head. Under similar temperatures the head temperature did not exceed 190 degrees with the puller fan. With the pusher fan the temperature when up to 215 degrees. The oil pressure stayed rock solid at 30 pounds and it did not spit any water. When I finally turned the engine off the engine head temperature when up to 220 degrees. Again it did not spit any water. I am thinking about adding a 2&1/2 to 3 inch electric fan mounted on the battery cover blowing air across the engine to try and keep the head temperature down. Any thoughts or recommendations would be appreciated. This is a 1949 8N front mount converted to 12 volt using points rebuilt including block cooked cleaned less then 100 hours ago. Radiator also tank cleaned when engine was rebuilt. [Reply]   [No Email]
NoNewParts 07-05-2012 09:47:07 67.240.145.25 Report to Moderator	Re: Pusher fan in reply to NOXJohn, 07-04-2012 06:55:11   Like others have said, the shroud is pretty important in any cooling system. air, like water will seek the path of least resistance. without the shroud, the air just blows out the side, instead of thru the tightly woven radiator fins. with a puller fan and no shroud, the tractors movement forward will give the air some help getting thru the radiator and the fan assists.(think of a car where the fan turns off when moving) with a pusher fan, forward momentum can't get air thru the radiator against the fan direction, and the pusher blows most of it's air out the sides without a shroud. =Hot Saw that a lot in my race car days, when shrouds were removed. put a tight fitting shroud back on with very tight clearance to the fan blades, and the problem went away. [Reply]  [No Email]
TheOldHokie 07-05-2012 08:04:37 71.176.133.123 Report to Moderator	Re: Pusher fan in reply to Lumpy, 07-04-2012 06:55:11   Quoting Removed, click Modern View to see I would call it expected behavior. Forcing warmer air through a radiiator simply doesn't reduce the coolant temperature as well as cooler air. Reduce the cooling efffect and the engine will run warmer. That's why many cars run warmer in the summer and cooler in the winter. Same number of fan blades? If not they may also be moving a different volume of air. TOH [Reply]  [No Email]
Gaspump 07-04-2012 17:09:15 72.40.147.47 Report to Moderator	Re: Pusher fan in reply to NOXJohn, 07-04-2012 06:55:11   Fully doubt that the pusher fan has anything to do with your increased temp. Since the ambient air is somewhat higher under the hood than in front it may or may not have an effect on engine temp. Remember the air pulled thru the radiator is probably hotter than the under hood pusher air. If under hood air does it should not be by much. What thermostat are you running, should be a 160, fan shroud is important either way. Did the water pump get altered in any way, water pump pumping, is the belt tightened to spec. Is it a Ford 8N pusher fan. I have ran pushers on 8N's since 1950 when picking corn necessitated one. Never saw any temp change differential like what you are seeing. [Reply]  [No Email]
NOXJohn 07-04-2012 18:45:03 184.5.161.74 Report to Moderator	Re: Pusher fan in reply to Gaspump, 07-04-2012 17:09:15   160 thermostat. No shroud with puller or pusher fan. Fan belt not touched when fan replaced. Ford spec. pusher fan. I would not have known that there was a temperature difference if I had not had a temperature gage. Oil pressure stayed the same and tractor ran the same with both fans. [Reply]  [No Email]
Bill Rowles 07-04-2012 14:20:59 76.2.228.203 Report to Moderator	Re: Pusher fan in reply to NOXJohn, 07-04-2012 06:55:11   The initial air temp. entering the radiator tubes and fins is higher with the pusher.....therefor the air cooling the water is a little higher temp. than with the puller fan. I have had both and it seemed the pusher needed the tubes and fins blown out with compressed air more frequently to prevent over-heating the engine. [Reply]  [No Email]
Noah W 07-04-2012 10:19:52 66.226.52.177 Report to Moderator	Re: Pusher fan in reply to NOXJohn, 07-04-2012 06:55:11   Only time a pusher fan is needed when you are constantly working in high crops or weeds, or extremely dusty conditions. Puller fans pull chaff, dust, and stuff into the radiator that will clog it up. Pusher fans greatly reduce the possibility of a clogged radiator. Don't ask me how I know. Noah W [Reply]  [No Email]
TheOldHokie 07-04-2012 09:02:53 71.176.133.123 Report to Moderator	Re: Pusher fan in reply to Bill Crowell, 07-04-2012 06:55:11   Quoting Removed, click Modern View to see I have my doubts that a little extra ambient air circulation across the head will offset the decreased coolant temperature drop the radiator is now producing. Keep in mind that hot radiator exhaust air used to go across the head and didn't push the temperature up :idea: I'd probably go the other way - put the puller fan back and add something to divert the hot radiator exhaust air away from the operator. Of course that doesn't address the chaff problem..... TOH [Reply]  [No Email]
Greg 2N (TX) 07-04-2012 08:21:37 67.142.170.20 Report to Moderator	Re: Pusher fan in reply to NOXJohn, 07-04-2012 06:55:11   I had a pusher fan, no temp gauge, and no shroud before my rebuild here in South TX! (just bought it like that before I found the problem) I had cracked block around cylinders (antifreeze in the oil). Anyway, now I have the puller fan, shroud, and temp gauge from the new head boss. Now she runs around 180 deg in hot South TX! Greg [Reply]  [No Email]
pikewi 07-04-2012 06:57:06 64.33.132.66 Report to Moderator	Re: Pusher fan in reply to NOXJohn, 07-04-2012 06:55:11   Are you using a shroud? [Reply]  [No Email]
NOXJohn 07-04-2012 10:53:36 184.5.161.74 Report to Moderator	Re: Pusher fan in reply to pikewi, 07-04-2012 06:57:06   The tractor does not have a shroud. I have one. I may install it as well. Thanks for the suggestion. [Reply]  [No Email]