Type 4 Fan assembly questions

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captain_kapow
Posts: 4
Joined: Wed Nov 08, 2017 2:29 am

Type 4 Fan assembly questions

Post by captain_kapow » Wed Nov 08, 2017 3:44 am

Are the critical dimensions of the 411 fan, crank hub and smog pulley the same as that of the Vanagon assembly?

Are there benefits of one fan assembly over another?

Vanagon fan part # 070 119 113 A

411 fan part # 021 119 113 N

I ask because I am rebuilding a spare engine for my Vanagon Westfalia, and I was about to send the rotating assembly out to be ballanced (fan, crank, pistons, flywheel etc). I spent some time and effort restoring the fan assembly from my donor engine, but realized that the hub size is different than that of the vanagon. This raised questions about the assembly as a whole.

I am wondering if the 411 assembly will play nice with the vanagon fan shroud? If not I will need to pull my van off the road and remove it's fan assembly to use while balancing the rotating assembly.

I have attached photos of the assembly I restored as a visual aid.

Any insight is appreciated.
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raygreenwood
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Joined: Wed Jan 22, 2003 3:01 am

Re: Type 4 Fan assembly questions

Post by raygreenwood » Sat Nov 11, 2017 2:01 am

If you took the fan apart....it MUST....now be trued on a lathe or live center as it NEVER goes back together straight. The pulley section has upwards to .025" of radial play in its bolt holes. Its tedious to do. You can do it on the crank at home...hand turning the engine over....with a dial indicator and wheel point in the pulley groove. Tighten the bolts just snug.....Turn....measure....tap.....tighten.

Then it MUST be balanced as a seperate assembly before adding it into the parts pile for overall engine balancing.

As far as I know the main fan design should be fine for vanagon. I would check with the vanagon guys on here or the Samba for sure. The hub is different....but the mount to the fan should be the same. The fan is largely the same. The differences in fans out there are mainly the floor of the fan on the inlet side. 411 and early 412 and early bus had the aerodynamic snout....all later models used the fan with the drive dog for the smog pump.

Seriously....if you took the fan apart and did not spend the time to true the runnout of the pulley.. the vibration will throw belts, is hard on the alternator bearings and the crank seal and # 4 main bearing. Ray

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oprn
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Joined: Sun Apr 09, 2017 10:21 pm

Re: Type 4 Fan assembly questions

Post by oprn » Sat Nov 11, 2017 8:32 am

Interesting! I took mine apart to clean it because it was such a mess, then I always give the steel parts a light coat of Tremclad paint...

Thanks Ray I will true it up.

captain_kapow
Posts: 4
Joined: Wed Nov 08, 2017 2:29 am

Re: Type 4 Fan assembly questions

Post by captain_kapow » Sat Nov 11, 2017 8:19 pm

Thanks for the warning!
Looks like I will be correcting the run-out on a lathe.

captain_kapow
Posts: 4
Joined: Wed Nov 08, 2017 2:29 am

Re: Type 4 Fan assembly questions

Post by captain_kapow » Sat Nov 11, 2017 8:19 pm

Thanks for the warning!
Looks like I will be correcting the run-out on a lathe.

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