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jessedavis528
Samba Member
Joined: February 16, 2017
Posts: 3
Location: IA
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 Posted: Wed Mar 22, 2017 6:02 pm Post subject: Fan is rubbing against the inner shroud. Need help |
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On my recent build the fan keeps rubbing on the inner fan shroud. This is my set up. I have taken it apart and put it back together multiple times and I can't figure out what's wrong. I know that the bolts on the pump are not touching the shroud and I know that the shroud is bolted to the case.i know that when I first put the fan on and tighten to 25 ft pounds that it doesn't grind but as soon as it hits 30 it grinds. The pictures are of the motor curious if it is because I'm no longer using the tower if that is the issue. Thoughts? Thanks for your time
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glutenfree
Samba Member
Joined: July 06, 2016
Posts: 238
Location: PDX
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| Posted: Wed Mar 22, 2017 7:57 pm Post subject: Re: Fan is rubbing against the inner shroud. Need help |
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I am building up my 1835 Type 3 engine and I noticed there a good amount of flex on the fan housing when bolted in place. Seeing how you deleted/omitted the factory breather mount (tower) I would place my money on that being the issue since the fan housing front half is not being "pulled" into proper position.
Does the fan rub on both halves?
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notchboy
Samba Member
Joined: April 27, 2002
Posts: 22462
Location: Escondido CA
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| Posted: Wed Mar 22, 2017 8:11 pm Post subject: Re: Fan is rubbing against the inner shroud. Need help |
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Do you have a spacer and paper gasket behind the fan and the crank?
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| t3kg wrote: |
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Jason "notchboy" Weigel
1964 1500 S
1964 T34 S Convertible
1977 Westfalia Camper pop-top |
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jessedavis528
Samba Member
Joined: February 16, 2017
Posts: 3
Location: IA
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| Posted: Thu Mar 23, 2017 8:02 am Post subject: Re: Fan is rubbing against the inner shroud. Need help |
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Im guessing that's my issue, my last one didn't have the spacer so I'm betting that's it
| notchboy wrote: |
| Do you have a spacer and paper gasket behind the fan and the crank? |
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notchboy
Samba Member
Joined: April 27, 2002
Posts: 22462
Location: Escondido CA
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| Posted: Thu Mar 23, 2017 8:29 am Post subject: Re: Fan is rubbing against the inner shroud. Need help |
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Ive had them with and without. Id guess the tolerances must vary.
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| t3kg wrote: |
OK, this thread is over. You win. |
Jason "notchboy" Weigel
1964 1500 S
1964 T34 S Convertible
1977 Westfalia Camper pop-top |
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Bobnotch
Samba Member
Joined: July 06, 2003
Posts: 22431
Location: Kimball, Mi
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| Posted: Thu Mar 23, 2017 11:46 am Post subject: Re: Fan is rubbing against the inner shroud. Need help |
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| jessedavis528 wrote: |
On my recent build the fan keeps rubbing on the inner fan shroud. This is my set up. I have taken it apart and put it back together multiple times and I can't figure out what's wrong. I know that the bolts on the pump are not touching the shroud and I know that the shroud is bolted to the case.i know that when I first put the fan on and tighten to 25 ft pounds that it doesn't grind but as soon as it hits 30 it grinds. The pictures are of the motor curious if it is because I'm no longer using the tower if that is the issue. Thoughts? Thanks for your time
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Is the large fan hitting, or the small one? If it's the large one, then you need to find out what's causing it to push out (toward the big fan). I only say that as the fan bolt needs to be torqued up to 98-105 ftlbs, or it WILL come loose. If it's the small one, then it might be missing the shim and paper gasket that Jason was talking about.
If you can, get some pics from the side between the case and the back of the shroud, as that might help us determine where your problem lies.
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71 Notch ...aka Krunchy; build pics here;
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Variant
Samba Member
Joined: February 09, 2008
Posts: 125
Location: South Africa
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| Posted: Fri Mar 24, 2017 2:06 am Post subject: Re: Fan is rubbing against the inner shroud. Need help |
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The issue is most probably due to the fact that you are not using the original crankcase breather. The fan housing attaches to that with three bolts. It needs that support since the weight of the generator as well as the tension of the drive belt will cause the fan housing to tilt rearwards if it was only held in place by the two 6mm bolts either side of the crankshaft. These fan housings are very fragile and do not appreciate any significant bending stress imposed on them. Unless properly supported, they will crack & come apart very quickly.
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'69 1600L Squareback Automatic
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jessedavis528
Samba Member
Joined: February 16, 2017
Posts: 3
Location: IA
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| Posted: Fri Mar 24, 2017 5:42 am Post subject: Re: Fan is rubbing against the inner shroud. Need help |
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You would be correct i just figured it out last night, when i was working on it. i put the original breather tower back on and it worked no issues. Thanks every one
| Variant wrote: |
| The issue is most probably due to the fact that you are not using the original crankcase breather. The fan housing attaches to that with three bolts. It needs that support since the weight of the generator as well as the tension of the drive belt will cause the fan housing to tilt rearwards if it was only held in place by the two 6mm bolts either side of the crankshaft. These fan housings are very fragile and do not appreciate any significant bending stress imposed on them. Unless properly supported, they will crack & come apart very quickly. |
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