6 Blade Fan Restoration
#1
Just an Olds Guy
Thread Starter
Join Date: Jul 2008
Location: Edmonton, AB. And "I am Can 'eh' jun - eh"
Posts: 24,525
6 Blade Fan Restoration
I know that's hardly a big deal to a lot of people, but there's some out there who want to do more than just shoot the fan with a coat of black paint and call it done.
Since I need to also restore my cooling system I felt that I might as well get a head start on the game. Currently my car doesn't have HD cooling, it's a stock 4 blade non AC car. Not adding AC, but I am adding HD cooling just on general principle of keeping the engine happier.
So far I have all the parts I need - rad shroud & lower mounts, HD water pump, new correct water pump pulley, fan, fan clutch, belts, new upper/side/lower shroud seals and OEM radiator overflow reservoir. I am currently working on getting a 3 row core radiator to top off the list.
Today was the day to tackle the fan. This is one I pulled last year from a 71 Cutlass Flattop with AC. Needless to say it needs some help. So here is my step by step of the restoration of this fan. It took over 5 hours and you'll see why in the following posts.
Since I just finished putting together my new sand blaster, I put it to good use. Since this isn't really heavily rusted I used 150 grit glass beads.
Here's what I started with. The fan is generally in good shape, but has one blade that needed to be straightened a bit. There's also some serious roughness and nicking on the edges of the blades.
After the first quick pass through the blaster the fan came out looking like this. I only wanted to clean the majority of crud on the first pass so I could work on cleaning and fixing the edges by hand.
Since I need to also restore my cooling system I felt that I might as well get a head start on the game. Currently my car doesn't have HD cooling, it's a stock 4 blade non AC car. Not adding AC, but I am adding HD cooling just on general principle of keeping the engine happier.
So far I have all the parts I need - rad shroud & lower mounts, HD water pump, new correct water pump pulley, fan, fan clutch, belts, new upper/side/lower shroud seals and OEM radiator overflow reservoir. I am currently working on getting a 3 row core radiator to top off the list.
Today was the day to tackle the fan. This is one I pulled last year from a 71 Cutlass Flattop with AC. Needless to say it needs some help. So here is my step by step of the restoration of this fan. It took over 5 hours and you'll see why in the following posts.
Since I just finished putting together my new sand blaster, I put it to good use. Since this isn't really heavily rusted I used 150 grit glass beads.
Here's what I started with. The fan is generally in good shape, but has one blade that needed to be straightened a bit. There's also some serious roughness and nicking on the edges of the blades.
After the first quick pass through the blaster the fan came out looking like this. I only wanted to clean the majority of crud on the first pass so I could work on cleaning and fixing the edges by hand.
#3
Just an Olds Guy
Thread Starter
Join Date: Jul 2008
Location: Edmonton, AB. And "I am Can 'eh' jun - eh"
Posts: 24,525
Deburr, sand, blast and tape takes more time than you think
The next step was to start getting rid of the burrs on the edges of the blades. Start with 100 grit sandpaper and work all around each blade from both sides. Then go over the entire surface with 220 or 240 to smooth out the light scratches from the 100 paper
There are stampings on the fan to likely indicate what the pitch of the blade is. Looks like this:
Now the fan goes back into the blast cabinet to get another full dose of 150 glass beads. This time I went over all the blade and center hub very carefully to give it a finished smooth surface that could be tac cleaned and painted. Before painting though, I wondered why the fan had to be ALL black?? Since I have the opportunity (and time) I decided to mask off the center hub and rivets on the reverse side. My idea was to create a 2 tone fan. Center would be natural metal cast, and the blades satin black. After a significant amount of taping and cutting, this is what I had. Notice how nice the blades look after that final blast and tack.
Every rivet was taped and tape cut back with an exacto knife.
The hub extensions and center all carefully taped off too
There are stampings on the fan to likely indicate what the pitch of the blade is. Looks like this:
Now the fan goes back into the blast cabinet to get another full dose of 150 glass beads. This time I went over all the blade and center hub very carefully to give it a finished smooth surface that could be tac cleaned and painted. Before painting though, I wondered why the fan had to be ALL black?? Since I have the opportunity (and time) I decided to mask off the center hub and rivets on the reverse side. My idea was to create a 2 tone fan. Center would be natural metal cast, and the blades satin black. After a significant amount of taping and cutting, this is what I had. Notice how nice the blades look after that final blast and tack.
Every rivet was taped and tape cut back with an exacto knife.
The hub extensions and center all carefully taped off too
#5
Just an Olds Guy
Thread Starter
Join Date: Jul 2008
Location: Edmonton, AB. And "I am Can 'eh' jun - eh"
Posts: 24,525
After the paint - A thing of beauty
First thing I did after taping was tack clean the blades again. Then shot them with a coat of satin black sand-able primer. That showed where a few minor flaws were, so they were lightly sanded and re-primed. Both sides looked uniformly even and the edges of the blades were all smooth and slightly tapered from the sanding I gave them.
After the primer dried, I inspected the fan to see how even the paint would lay down. I was pleased so it was on to the next step. Put something under the center of the hub enough to keep it from touching the ground/table/whatever you're working with. Shoot uniform coats of semi gloss black onto the blades. This is where patience is a virtue. Don't try to rush and turn the part over right away. After the paint has flashed and dried for at least 1/2 hour, turn over the fan and paint the other side. Set aside and let dry for a couple hours.
After removing the tape? You now have a 2 tone 6 blade fan that looks probably better than the day it was made. I will wait for another couple of days for the paint to fully cure. Then I'll shoot the whole assembly with satin clear to preserve the center metal cast. Otherwise it will start flash rusting soon as there's moisture in the air.
Hope you enjoyed this simple but interesting restoration. Sometimes it's the little details that make life interesting.
This Restoration Idea was brought to you by the numbers 7 and 2 and the letters O,L,D,S,M,O,B,I,L,and E.
After the primer dried, I inspected the fan to see how even the paint would lay down. I was pleased so it was on to the next step. Put something under the center of the hub enough to keep it from touching the ground/table/whatever you're working with. Shoot uniform coats of semi gloss black onto the blades. This is where patience is a virtue. Don't try to rush and turn the part over right away. After the paint has flashed and dried for at least 1/2 hour, turn over the fan and paint the other side. Set aside and let dry for a couple hours.
After removing the tape? You now have a 2 tone 6 blade fan that looks probably better than the day it was made. I will wait for another couple of days for the paint to fully cure. Then I'll shoot the whole assembly with satin clear to preserve the center metal cast. Otherwise it will start flash rusting soon as there's moisture in the air.
Hope you enjoyed this simple but interesting restoration. Sometimes it's the little details that make life interesting.
This Restoration Idea was brought to you by the numbers 7 and 2 and the letters O,L,D,S,M,O,B,I,L,and E.
#6
Just an Olds Guy
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Join Date: Jul 2008
Location: Edmonton, AB. And "I am Can 'eh' jun - eh"
Posts: 24,525
#8
When a friend and I restored his 69 chevelle in my garage, we used his compressor which looks just like yours. We hooked up the portable sandblaster to it and it was nice. To get the 220v we ran a cord outside to my A/C unit lol. It was late in the season anyway, so we didn't need the A/C. when ever I wanted to clean the floor I just used the air hose..
#10
Just an Olds Guy
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Join Date: Jul 2008
Location: Edmonton, AB. And "I am Can 'eh' jun - eh"
Posts: 24,525
I actually got the idea last year when I restored my rear axle and differential. I decided to add a W27 cover to the diff. Instead of painting the pumpkin black, I decided to go with a 'simulated W27 axle'. It's NOT a W27 as the cover wasn't really even an option in 72, but I think it looks cool as heck.
It used to be an SA 2.73 open. Now it's a 3.42 posi. Same concept only in larger scale.
It used to be an SA 2.73 open. Now it's a 3.42 posi. Same concept only in larger scale.
#13
Just an Olds Guy
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Join Date: Jul 2008
Location: Edmonton, AB. And "I am Can 'eh' jun - eh"
Posts: 24,525
Thank you Juve.
You'd be surprised - probably just go over and see Henry (DENT). Love his 72 W29 442! I think he has a blaster he could do that for you pretty quick. The only thing that determines time on this kind of project is what kind of results you want. As far as materials cost, the primer and paint are quite inexpensive. I used FROG tape (no bleed ever) to ensure good adhesion and crisp lines.
Actually right now I have plenty on the work agenda for my own car and I'm helping a local guy with his 71 CS at the same time. I'd like to get mine to a driving condition within the next month so I can see how much improvement has occurred in the last 2 years of rebuilding.
You'd be surprised - probably just go over and see Henry (DENT). Love his 72 W29 442! I think he has a blaster he could do that for you pretty quick. The only thing that determines time on this kind of project is what kind of results you want. As far as materials cost, the primer and paint are quite inexpensive. I used FROG tape (no bleed ever) to ensure good adhesion and crisp lines.
Actually right now I have plenty on the work agenda for my own car and I'm helping a local guy with his 71 CS at the same time. I'd like to get mine to a driving condition within the next month so I can see how much improvement has occurred in the last 2 years of rebuilding.
#15
Great work Allen !! I love the little details it really what makes the car and all the hrs worth it !! Recently I wanted to take a short cut and my paint guy refused to paint it tell it was redone ,it really opened my eyes to a new found respect .
#18
I actually got the idea last year when I restored my rear axle and differential. I decided to add a W27 cover to the diff. Instead of painting the pumpkin black, I decided to go with a 'simulated W27 axle'. It's NOT a W27 as the cover wasn't really even an option in 72, but I think it looks cool as heck.
It used to be an SA 2.73 open. Now it's a 3.42 posi. Same concept only in larger scale.
It used to be an SA 2.73 open. Now it's a 3.42 posi. Same concept only in larger scale.
The fan and diff both look great nice work.
Are those factory bolt's on the diff cover? If not I think it would even look better with stock style bolts.
#19
Just an Olds Guy
Thread Starter
Join Date: Jul 2008
Location: Edmonton, AB. And "I am Can 'eh' jun - eh"
Posts: 24,525
Here's a pic taken during the install that shows the proper GM diff cover bolts
Last edited by Allan R; July 8th, 2013 at 09:19 AM. Reason: add picture
#20
I think it looks a million times better now too!
BTW, the differential is cool too.
#23
[QUOTE=Allan R;565611]No, those were mock ups that were holding the cover before I installed the gasket and gear oil. I bead blasted the original cover bolts, painted them a matching aluminum and installed them. They also have a flanged edge that serves as a lock washer. Nice to see you also pay attention to details!
Here's a pic taken during the install that shows the proper GM diff cover bolts
[/QUO
That's better, looks nice you have a good eye for detail . I like quality workman ship and it all starts in the prep., When I seen how you prepped the parts I knew it would turn out nice.
Here's a pic taken during the install that shows the proper GM diff cover bolts
[/QUO
That's better, looks nice you have a good eye for detail . I like quality workman ship and it all starts in the prep., When I seen how you prepped the parts I knew it would turn out nice.
Last edited by Bernhard; July 8th, 2013 at 08:17 PM.
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