Fan Reassembly Bolt/Washer/Nut order

[surfbus23]

Having failed to correct either of my two other main issues today I'm moving on to something else. I took the fan apart to clean it up and make it look new. I know the assembly order of these things, but I'm not sure which side the spring washer goes and can't find it in either the fiche or the Bentley.

Basically, does the little spring washer go on the side pictured here or on the other side. My gut and my recollection is that it goes on this side, but thought I should make sure.

...this project is really kicking my ass right now. Will be great when it's done though.

[surfbus23]

Follow up question. For something like this that I haven't seen a torque spec for how tight should they be?

Thanks!

[hazetguy]

did you mark the fan so everything will be assembled in the same orientation as it was when you took it apart?
if not, chances are good that you'll now have an imbalanced fan assembly.
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[raygreenwood]

[surfbus23]

Mmm... I see. It looks like Ratwell provides the correct position to put it on, no? http://www.ratwell.com/technical/FindTimingMark.html

Regarding the truing. I'm pretty sure I'm going to be out of my league on this one. Is this something that shops do?

[Busstom]

[busdaddy]

I made up a mandrel to mount the hub in my big lathe, then I clamped a soapstone into the toolpost and marked the high spots in the pulley. If you leave the fasteners slightly loose you can bump the high spots down (shift the ring slightly on the fan, not bend) with a deadblow hammer until you reach the best average where the contact is reasonably even (mark/bump/wipe off/repeat until happy and then tighten the bolts).
The fan ring isn't 100% true on the outer periphery, you have to measure 1/2 way down in the pulley Vee so the belt runs true. It takes quite a bit of fiddling to reach that happy spot (hours).

You could do it on the engine using the starter with the plugs removed if you made up something to hold the soapstone or chalk accurately, tedious of course, but what are your options?
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[Busstom]

Yeah, I may be oversimplifying the reality of it. After all, it's just stamped, right? Probably not as easy as working with precision parts
I still want to take advantage of an old engine I have access to, buy it and use it for this purpose, among other things.

[busdaddy]

You got it, it's stamped, so the outer edge of the ring as well as the lip of the pulley are going to be off even when the belt area of the pulley is true, and the belt part is what counts.

You could have a local machine shop machine a taper on the end of a section of surface ground bar stock and tap it so you can mount the hub, then all you would need is V blocks to true the ring. Or have an adaptor made to mount the hub on an electric motor shaft or something else with bearings that spins true, in the end it's all about simulating the crank shaft.
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[raygreenwood]

[Tcash]

[SGKent]

I did one of these - looked clean, was indexed perfectly and also was a huge Cluster-f. BusDaddy bailed me out. You can't get the fan to run true once it is taken apart unless you have a lathe and a jig to measure subtle differences in movement. There is so much slop in the parts and bolt holes that the pieces don't run true once apart. The fan belt was hopping like a bunny rabbit because of it - stressing the motor and alternator. It is too late to say don't take it apart but you will need a jig to put it together correctly. You can't run it until you true it - and maybe balance it too.
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[surfbus23]

I guess I'll start checking the Classifieds, unless someone knows someone who does this. I called up RIMCO in Orange, CA and the parts guy there didn't seem to believe in truing...

[CarlosZ]

I took mine apart to clean it and put it back together the same way. It started to come loose within minutes and hit the shroud. The two parts need to be aligned perfectly, not just reassembled in the same order. I had to have my engine builder re-assemble it as I didn't have a lathe to spin it on.

[raygreenwood]

[quote="Tcash"]

[surfbus23]

Ok. So got a new fan instead of trying to reassemble the old one. This one had some strange holes in the top of it. Any ideas what these are for? They look machined.

[Tcash]

They drilled those holes to balance the fan.

[surfbus23]

Thanks! Kind of what I was thinking. No one else to ask though. So the method for balancing changed at the factory or this was done after it left the factory?

[Wildthings]