Some time ago, my Weberized BumbleBeast's EA82 engine developed a weird Rattle Noise, I thought it was a worn A/C Compressor's Ball Bearing, as I Posted ~► Here.
After more Searchin' I Found the Culprit, it was the Fixed Fan, moved through a fan clutch, attached to the Waterpump's Pulley...
The Fan clutch itself had failed around the year 1993, so I decided to Fix it then, by Drillin' a 1/4" Hole thru the Fan clutch and insert a 1/4" Twisted wire into that hole, then Welded that wire to the Fan's Base; as you can see in the Followin' picture:
It worked good since then... but now, several years later; the Hole I Drilled on the Fan Clutch's area became Wider, due to normal vibration and the Welded wire became Loose, making the Fan to be Loose; that was the Rattle noise Source: that thing was Ruined.
After Asking~► Here:
...or is Better idea to Replace the pulley-driven Fan, retrofitting an Electric Fan?
Someone told me that the lack of the Fixed fan on the Waterpump's Pulley, will aid the Waterpump to last longer and also will help to the Engine to gain a healthy amount of more Hp...
And getting confirmations like This:
Yes and yes. You also gain throttle response and it makes changing timing belts and other maintenance easier...
I Decided to Completely Remove and erase the Fixed Waterpump's Fan and Swap there a second electric Fan.
First of all, you must know that the EA82 engines with A/C, comes with the above described Waterpump's Fan and one electric Fan, which comes already Wired from factory to Start (turn ON) in two ways:
- It Starts when the A/C switch is pressed "ON", Regardless the engine's Temperature; or...
- It Starts when the Engine's Temperature reaches the amount of degrees on the Radiator's Thermo Switch.
First Step: To Remove the Old Fan from the Waterpump's Pulley.
Certain EA82's has separate Screws to hold the Waterpump's Pulley and to place there the Fan,
While the most usual setup is that Studs holds both, the said Pulley and the fan assembly at the same time.
My BumbleBeast came with the said Studs as you can see in the Following Picture:
There you can see the Studs still on the Waterpump's pulley and also the Space clearance, between the said Pulley and the Radiator.
By the Way I must say that I'm Runnin' my BumbleBeast with a Double Row Radiator.
EA82's came from factory with double and single row radiators.
Double row ones have better cooling capabilities plus they holds almost Twice the Coolant amount than their single row counterparts... Those double row ones are preferable.
You can see the Original stock two fans on the Floor, the Pulley driven one next to the electric one, in the Following Picture:
Second Step: To Remove the Studs from the Waterpump's Pulley.
In order to obtain more clearance and to be Safer, you'll Need to remove the Studs on the Waterpump's Pulley.
In the Models with separate screws isn't Big Deal, but in the ones with Studs for both things (Pulley & Fan), the Studs shall be replaced with Screws.
In the Following picture, you can see How the Pulley Looks Like with one Stud Removed, three of them still remain in their Place:
I Found the Right Replacement Screws: M 6 X 12 mm with 1.0 Pitch
You Shall Use Lockin' Washers.
They not only Lock the Screws in Place, They also reduce the 12 mm screw's Lenght to a safer 10 mm to avoid contact on the Waterpump's shaft.
The Screws' Heads with Lockin' Washers are less Tall than the Center Shaft:
You can Notice the Clearance Space:
Third Step: The Search for the Proper Replacement.
Since EA82's Heads usually are Weak and tend to Warp around their Head Gaskets whenever the Engine Runs at High Temperatures for long periods; I Highly recommend to instal a Second Electric Fan in the Place of the Removed mechanical one; so you can Ensure that your Subie's engine coolin' system will Run Safely.
By the Way, there are Three generations of EA82 Heads, as you can Read ~► Here.
Since the Space clearance Between the Radiator and the Waterpump is around 2½" inches, the selected electric fan must be Thin enough to fit there securely while it left enough free space to let the waterpump's Pulley behind, spin Freely; so a Maximum of 2" thick is the Limit.
I went to hunt for an Already Twin Electric Fans in a single Frame steup, to our local Junk Yards (Named here "Yonkers") Because first I Wanted to remove Both stock fans and do the install as Simple as Possible.
Lots of cars comes factory with Twin fans in a Single frame, such like certain Sentras (Nissan) or Corollas (Toyota), I Measured all of them and the Nissan ones got their Motor Stickin' out too much (More than 3") while the Toyota ones where Thinner.
These are the Corolla's:
But they measured more than 2¾ inches Thick.
Then, after searchin' a Lot, I found a Toyota Prius, which looked like the Right Setup.
The Prius has one of the Worst crowded engine bays I've seen in all my Life, even the hand of a young girl can't go inside there!
Twin Fans frame, from the Prius:
Made in Japan, by Nippon-Denso:
Eleven curvy blades per fan, and 2¼ inches Thick:
Here you can see How the Prius fans Looked like, placed over my Subie's Radiator:
Well, my Subie's Radiator is a Full Metal, made in Honduras Replacement, with Two Rows, that has the Same Measurements than the Stock one...
I discovered that it needed Maintenance (Cleansing & New Paint), just by Lookin' at it:
Trying the Prius' Fans made me found this Four Things which I Didn't Liked:
- You'll Need to Fabricate custom Mounts for the New Prius' Fans on the Subie's Radiator.
- You'll Need to Remove the Power Steering's Fluid Reservoir Tank to get Enough Space to Slide the Prius' Fans in Place.
- Once Placed, the Space Between the Spinning Pulley and the Fan's Back on the Driver's Side, is very very short. :-/
- That will Complicate my Philosophy of Simplifying Things on my BumbleBeast, that made me to even Remove its Timing Belts' Covers, as you can Read ~► Here.
I Even Tried all That, as you can See in the Followin' Pictures:
Removed Reservoir Tank
It was Very Dirty:
So I Deep Cleaned it and its internal debris catching Magnet:
I Needed Something Easier to Find and to Work with: The Solution is An Aftermarket Electric Fan.
So I Only needed to Find one Thin fan to put in Place of the Removed (Mechanical) one. That lets me Keep the (Original Subaru) Stock Electric Fan...
I Was Able to Return the Prius' Fans to the Junk Yard...
Edited by Loyale 2.7 Turbo, 18 February 2012 - 12:20 AM.