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Zarzamora
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Joined: September 07, 2006
Posts: 123
Location: you tube puppetforchrist San Antonio
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 Posted: Wed Oct 10, 2018 7:14 am Post subject: Fan Nut |
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I have a question, is there a better way to secure the fan nut that’s sits inside the fan shroud? Mine keeps coming loose and I’m afraid that if tighten anymore I may strip the threads. I thought about applying some “lock tight” since the fan is critical to the cooling of the engine. Any Suggestions?
Thank you in advance,
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Cusser
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Joined: October 02, 2006
Posts: 33106
Location: Hot Arizona
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| Posted: Wed Oct 10, 2018 7:28 am Post subject: Re: Fan Nut |
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I'll assume that you have the correct washer there, and that yiu are using a 36mm socket and torquing to the correct specification.
If you have been doing that, I'd try some blue Loctite thread locker and then torque correctly; not red Loctite. Permatex has similar quality products, and I no longer work for Henkel-Loctite. So I use either.
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1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297 |
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EverettB 
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Location: Phoenix 602
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ashman40
Samba Member
Joined: February 16, 2007
Posts: 16590
Location: North Florida, USA
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| Posted: Wed Oct 10, 2018 9:26 am Post subject: Re: Fan Nut |
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| Zarzamora wrote: |
| Mine keeps coming loose and I’m afraid that if tighten anymore I may strip the threads. |
Fan nut torque spec is 45ft-lbs. Are you tightening it more than this?
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AshMan40
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bhartwell59
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| Posted: Wed Oct 10, 2018 11:30 am Post subject: Re: Fan Nut |
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| EverettB wrote: |
| It shouldn't come loose. I would check the wavy washer on it to see if it's missing or cracked. |
I would think the wavy washer would make the fan loosening a moot issue
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Cusser
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Posts: 33106
Location: Hot Arizona
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| Posted: Wed Oct 10, 2018 11:38 am Post subject: Re: Fan Nut |
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| bhartwell59 wrote: |
| I would think the wavy washer would make the fan loosening a moot issue |
It "should".
In the early-1970s, my GF bought a home-made metal-bodied VW which looked somewhat like a Jeep or Thing. Her fan nut came loose, and because of the home-made frame there was absolutely no way to get a wrench/socket in there to simply retighten it.
So the engine had to come out just to tighten that correctly.Of course I was the labor for this, and remember fussing over the top right starter/engine nut before figuring out that it was an SAE size, not metric, why I didn't have a tool to fix that. Anyway, I did fix.
A year later, after she crashed that and had bought a regular VW beetle, and we had broken up, she needed a rebuilt engine installed after changing over all the bolt-on parts, so she called me to ask for my help. That took all day, but at least she "rewarded" me well for my efforts, but cannot elaborate as this is a family forum....
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1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297 |
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Zarzamora
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Joined: September 07, 2006
Posts: 123
Location: you tube puppetforchrist San Antonio
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| Posted: Wed Oct 10, 2018 11:57 am Post subject: Re: Fan Nut |
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I'll check to make sure the correct washer is on there, I'll also double check the torque specs.
If worse comes to worse I'll use the "blue" Loctite
I had the motor built so I have to check the washer and because in all honesty I'm not sure if it was torqued correctly the first time. I just tighten it the last couple of times not knowing that it had to be to specs.
Thank you all so much!!
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Cusser
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| Posted: Wed Oct 10, 2018 12:15 pm Post subject: Re: Fan Nut |
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In reality ALL nuts/bolts need to be within a specified torque range, to provide stretch to the bolt/screw to keep the assembly tight.
Too much torque is as bad as too little. Too much and things break, strip, or become brittle.
Harbor Freight has 3 sizes of click-type torque wrenches for $10 right now with coupon; I have all three sizes. These will be your friends.
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1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297 |
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Zarzamora
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Joined: September 07, 2006
Posts: 123
Location: you tube puppetforchrist San Antonio
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| Posted: Wed Oct 10, 2018 12:35 pm Post subject: Re: Fan Nut |
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| Cusser wrote: |
In reality ALL nuts/bolts need to be within a specified torque range, to provide stretch to the bolt/screw to keep the assembly tight.
Too much torque is as bad as too little. Too much and things break, strip, or become brittle.
Harbor Freight has 3 sizes of click-type torque wrenches for $10 right now with coupon; I have all three sizes. These will be your friends. |
Thank you!
Yes I have a torque wrench, I just hope that I didn't strip the bolt 
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Zundfolge1432
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Joined: June 13, 2004
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| Posted: Wed Oct 10, 2018 3:13 pm Post subject: Re: Fan Nut |
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The washer in question is not a wave washer it is however a locking washer with two ears that face up. Put it on wrong and it digs into the fan and can cause a crack and ruined fan. Here’s my pic
Here’s the washer notice the tits or raised portion fits towards front of car not digging into fan
This is wrong tits are facing fan
And here’s the damage caused by putting washer on wrong it will crack eventually. Do not use any Loctite it is not needed and will make the removal very difficult next time. |
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runamoc
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Location: 37.5N 77.1W
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| Posted: Thu Oct 11, 2018 7:44 am Post subject: Re: Fan Nut |
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The Bentley sez...install lock washer so it's raised periphery is towards the special nut. Torque the special nut to 40-47ft/lb...
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bluebus86
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| Posted: Thu Oct 11, 2018 8:25 am Post subject: Re: Fan Nut |
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| Zarzamora wrote: |
| Cusser wrote: |
In reality ALL nuts/bolts need to be within a specified torque range, to provide stretch to the bolt/screw to keep the assembly tight.
Too much torque is as bad as too little. Too much and things break, strip, or become brittle.
Harbor Freight has 3 sizes of click-type torque wrenches for $10 right now with coupon; I have all three sizes. These will be your friends. |
Thank you!
Yes I have a torque wrench, I just hope that I didn't strip the bolt |
It is not a bolt! The external threads are cut into the generator armature shaft. strip them and you will need to replace the generator, or at least the armature. Do not over tighten it, do not strip it.
Also make sure the woodruff key is installed. If the key is missing, that is not good and I think that it would allow the fan to slip, and I think given the direction of rotation that could loosen the nut. but then again, I am lesdystic!
All the little bits must be in good shape and present.
Bug On!
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Zarzamora
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Joined: September 07, 2006
Posts: 123
Location: you tube puppetforchrist San Antonio
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| Posted: Thu Oct 11, 2018 9:37 am Post subject: Re: Fan Nut |
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I was able to take some pictures last night ... should I be concerned of the "gap" on the left top corner?
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Starbucket
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| Posted: Thu Oct 11, 2018 1:56 pm Post subject: Re: Fan Nut |
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Pull the fan. I bet the woodruff key is missing other wise there would be no back and forth movement, or you have too many shims behind the fan on the hub so not e`nuff room on the flats for the fan to hold.
Last edited by Starbucket on Thu Oct 11, 2018 2:03 pm; edited 1 time in total |
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Zarzamora
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| Posted: Thu Oct 11, 2018 1:59 pm Post subject: Re: Fan Nut |
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| Starbucket wrote: |
| Pull the fan. I bet the woodruff key is missing other wise there would be no back and forth movement. |
Do you happen to have picture of the woodruff key? Where should it be located on the shaft / fan...
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Starbucket
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| Posted: Thu Oct 11, 2018 2:15 pm Post subject: Re: Fan Nut |
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| The hub and the shaft is where it is. |
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74 Thing
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Joined: September 02, 2004
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| Posted: Thu Oct 11, 2018 2:16 pm Post subject: Re: Fan Nut |
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| I would get a new fan and fan hub assembly. |
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mukluk
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| Posted: Thu Oct 11, 2018 2:38 pm Post subject: Re: Fan Nut |
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| Zarzamora wrote: |
| I was able to take some pictures last night ... should I be concerned of the "gap" on the left top corner? |
The gap shown is where the mount hole in the fan has been hammered due to the fan being run loose. Provided it hasn't started to crack, you should be fine once you properly install the fan and torque down the nut. The woodruff key prevents the fan hub from rotating on the generator armature shaft and has nothing to do with the fan being loose on the fan hub.
Yes, the diagram shows a 6v generator and not a 12v, but the parts layout is the same other than the voltage regulator and pulley hub.
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Starbucket
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| Posted: Thu Oct 11, 2018 4:08 pm Post subject: Re: Fan Nut |
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| There should be spacer washers on both sides of fan, yours are all behind the fan. You put some in back and check the fan to shroud clearance 0.06-0.07in and place the remainder on the nut side then the lock washer. |
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bluebus86
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| Posted: Thu Oct 11, 2018 5:04 pm Post subject: Re: Fan Nut |
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| mukluk wrote: |
| Zarzamora wrote: |
| I was able to take some pictures last night ... should I be concerned of the "gap" on the left top corner? |
The gap shown is where the mount hole in the fan has been hammered due to the fan being run loose. Provided it hasn't started to crack, you should be fine once you properly install the fan and torque down the nut. The woodruff key prevents the fan hub from rotating on the generator armature shaft and has nothing to do with the fan being loose on the fan hub.
Yes, the diagram shows a 6v generator and not a 12v, but the parts layout is the same other than the voltage regulator and pulley hub. |
if the key is missing, the hub will spin relative to the shaft, which might cause the nut to loosen on one end, and tighten on the other.
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