Fan blades are BREAKING

On the back of the mounting flange of the fan is a small raised circular ridge that indexes the fan to the hub. Since this has happened on 2 fans it is possible that the recess this fits into is not concentric with the hub. I had a NOS hub that had to be machined because the recess was off center. This could be the source of unbalance even if the fan was perfect. Probably the reason this hub was in the parts bin was that fans didn't easily mount up.
 
How to remove pully from installed motor = remove lower radiator hoses from motor only, remove funny looking wish bone support member from fenders and center of axle, place large pipe wrench on pully flange lock in against left fender, 1.125" 6pt socket w/ breaker bar, Effort = loose pully. Thank you Dad.
I will take old pully and my next victim to machine shop for a balance test. Will update when I have answers. I like the rope idea. Thank you all.
 
Duce - So I remember this blade not falling into the hub recess as you describe. However the bolts drew it tight and I needed to tap the fan to get it off the hub shaft. i just rebolted it on the bech and the same thing. The bolts brought the two together and needed a tap to seperate. So. Are you saying that even if this happens it could still be off center?
 
I don't have an answer for your fan issue, just a pointer on stopping the engine moving so you can undo the crank bolt. Don't use first or reverse gear. Use top gear. It works much better. With the radiator out, you can't beat a knocker gun.
Hope you find your issue.
Martin.
 
Just get the breaker or ratchet handle pointed in a direction that gives some room, probably downward, and give it a good smack in the offward direction with a big rubber mallet. Okie impact wrench!

I wonder if the vibration might be based on some violence within the crank like a cylinder firing way too early from crossfire or wrong wiring...this can result in one cylinder trying to run backwards while one does nothing.
 
Forte, if more then just a little pressure is needed to seat the fan or remove it, I would have the concentricity of the recess checked in a lathe by a machinist. Yes, it could be off a little. Things can get mis machined when manufactured.
The fact this happened 2 times makes me suspect the hub, not the fans, as the source of the problem.
 
Put the transmission in 3rd gear and set the brakes. Too much torque multiplication in low or reverse.
 
Test drove the car w/out the fan on, just a different hub. And before I even get 100' I hear the rumble. So I will attemp to remove the trans and go after the pressure plate area. In doing so I will go over every darn thing I touch and inspect 100%. FYI, I felt a vibration in both the gas and clutch pedals while heavy racing of the motor while sitting still. And that rope trick did save a lot of hassel when installing the hub, I needed to align the key way. Thank you all again. I'm sure I will be asking for help as I get into it. Any one live near Hampstead MD and want to join the fun?
 
I had a fan blade come off on my 48 F1, which had a 51 Merc motor in it at the time. Went right through the hood. Scared the crap out of the kids and I. I am very wary of standing next to a running motor now.
I hope you find out what cause this. Good Luck!

Jeff:confused:
 
Hi Everyone, Yikes, two broken fans and a rumble/vibration. I don't know anything about this model year. I sure hope somebody in the area can listen to this car to help point the diagnosis.
 
Yeah, I don't know exactly what is going on?? Post#22 and several others were NOT showing at the time I wrote my comment. Perhaps I needed to refresh?

Thanks,
JWL
 
It is amazing how much the pressure plate can be out of balance. It's a bit late to balance the crank but the flywheel and the clutch PP assembly. If you don't find another cause of the vibration.
 
With the transmission shifting issue, I have the same issue after changing the oil to 80/90wt and it was suggested to add a couple ounces of STP and that solved the grinding gears issue, especially when warmed up.
 
Not an expert but does the vibration you spoke of only happen under load or will it happen just bringing the r.p.m.s up in neutral.I chased a vibration that only under just the right load was causing the engine to move and contact the chassis. Maybe try loading up the drive train by power braking or with parking brake on ,have someone watch to see if that could be making your fan contact something.
 
The fan is not contacting anything. It rumbles sitting still and revving it and it rumbles getting up to 45mph. After that it purrs like a kitty. But going up hills it rumbles no matter what speed. Im taking it to a local car shhow this Sun. hope to get some people who know more than me to take some crakes at its health issue.
 
53F100Jeffie said:
I had a fan blade come off on my 48 F1, which had a 51 Merc motor in it at the time. Went right through the hood. Scared the crap out of the kids and I. I am very wary of standing next to a running motor now.
I hope you find out what cause this. Good Luck!

Jeff:confused:
Click to expand...

Jeff, I had the same thing happen on a 50 merc engine. Fan blades work hardened and cracked. Then one day when I was leaning over the engine giving it a little gas, fan blades went through the hood and radiator. Since then I learned: Never stand in the line of fire.
 
Crank may be broken. I had a VW that broke the crank at the center main. Ran fine but had funny vibration and noises. More pronounced as the load increased.
 
I would be more then happy to help but you live 3000 miles from me. Good luck and let us know what was the cause.
I once had a situation where the car ran fine at idle but shook like it was unbalanced when revved up. After inspecting the plugs, I could see one hadn't been firing even though there was spark there when shorted with a screwdriver. After further inspection, I had somehow adjusted the intake on that cyl way wrong and it wasn't opening enough to let enough fuel in. It wasn't that noisy either. Adjusted it correctly and it purrs like a kitten. I doubt that is your problem but it can always be something really weird.
 
Forte, I am a member of the EFV-8 C/A, RG36 here in MD, and I read your email to Norm that he forwarded to all of our club members. I am guessing that you either bought or borrowed a water pump if you are planning to drive your car from Hampstead to the Howard County Farm Museum this coming Sunday?? I would have liked meeting you and listening to that rumble noise, but unfortunately I cannot make it to that show due to family obligations that same day.
I may be a pessimist, but I believe you have something seriously wrong internal to your engine or possibly in the area of the flywheel that's causing components to break or otherwise fail. I really question driving your car, or even running the engine until you or a mechanic determines exactly what is wrong. Maybe you are planning to trailer to the show, but even then, if you have installed another fan, please do not allow anyone to be near the engine while it is running and the hood is open.
 
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