Need some help with my T4 fan shroud

oscarsnapkin

I'm trying to figure out what I need here for my fan shroud to function properly.

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What am I missing here to hold the spring down? Is it simply a flat metal tab that screws into the shroud, or is it something more elaborate? If anyone has a picture of a correct setup I would love to see it.

This side is simply a flat tab that holds the flapper rod?

Will this missing flap affect engine cooling? Any ideas on rigging up a replacement flap? Will I be able to access this once the engine is installed if I wanted to add a flap once I find one?

One final question about the large cooling flaps on the back of the shroud (I forgot to take a picture). When they are in the 'closed' position, they do not completely close, and they leave a small gap between the flap and the shroud. This is normal I assume? Thanks.
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Randy in Maine · Posted: Fri Mar 21, 2014 6:25 am Post subject:

Those flaps on the shroud are held in using a "spring steel" and a screw. You can make it if you can't find them.

I have been using this stuff to coat the shroud & engine as opposed to paint. Looks better after a few years than paint....

http://www.amazon.com/Gibbs-Brand-Lubricant-12-12oz-cans/product-reviews/B00B2DO6M2

Wildthings · Samba Member Joined: March 13, 2005 Posts: 50350

The little lever that holds the wire looks like it is bent off the the right a bit. I would grab it with a cresent wrench and gently bend it back.

It will not hurt you cooling system one iota to run without these flaps. I would not have them on my bus engine as they have a notorious habit of breaking off and falling into the heat exchangers thus blocking heater air flow. They are a hold over from a Type 4 car which had a gas heater that could be run while the engine was off and were used to prevent the back flow of air from the heater fan through the fan shroud instead of forward into the cab where it was wanted.

The little covers that go over the flaps are very important as you will have both poor heater performance and lessened cooling air flow without them. I seal the heat exchangers and the little covers to the fan shroud with copper silicone to both prevent air loss and to prevent the wear that comes from the relative movement between the parts.

curtis4085 · Posted: Fri Mar 21, 2014 8:44 am Post subject:

Question?? I have not seen the black metal tabs on late model buses.

https://www.thesamba.com/vw/gallery/pix/916733.jpg

Did all type 4 engines have this item?
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udidwht · Posted: Fri Mar 21, 2014 9:31 pm Post subject:

The small covers that go over the flaps in the lower cooling shroud aren't a deal killer in terms of either cooling capacity or heat loss to the cabin. If you have the covers use them if not don't sweat it.

I've worked on enough T-4 buses with and without them and found the difference in cooling loss/heat loss is...nil...zero.

Ever put your hand over one that didn't have the cover/s with the engine running? You feel almost next to nothing in terms of any loss.

But if you have the parts...use them.

What is 'Critical' is to make sure that the tubes running from the HE's to the auxiliary heater fan are in place. If not make sure they are capped/blocked off otherwise you'll flood the engine compartment with hot air which will get drawn back into the cooling fan.

The auxiliary heater fan has flaps inside that open/close with fan use/non use.
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raymino · Posted: Mon Mar 24, 2014 1:01 pm Post subject:

x2 on the Gibbs Brand. It is the stuff! Looks great on tranny case too!

Thanks Randy
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Randy in Maine · Posted: Mon Mar 24, 2014 1:54 pm Post subject:

oscarsnapkin · Posted: Tue Mar 25, 2014 1:22 pm Post subject:

Here's a picture that does a better job of asking my question. The curved piece that the yellow arrow is pointing to, is that a separate piece that holds the spring in place, or is it part of a piece of tin? I just can't seem to figure out how he spring is locked into its loaded position.
_________________
- 1977 CEI Sunroof Bus 2.0L F.I. Hydraulic Lifters
- 1973 Thing

"It’s so easy to laugh, it’s so easy to hate, it takes strength to be gentle and kind."

curtis4085 · Posted: Tue Mar 25, 2014 1:45 pm Post subject:

That's where spring end goes
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curtis4085 · Posted: Tue Mar 25, 2014 1:48 pm Post subject:

Where these tabs on all year type4 bays?

https://www.thesamba.com/vw/gallery/pix/916733.jpg

My 79 all original didn't have em when I go it nor does it now. Wondering if I should have or if they were discontinued on later years
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oscarsnapkin · Posted: Tue Mar 25, 2014 1:59 pm Post subject:

curtis4085 · Posted: Tue Mar 25, 2014 2:04 pm Post subject:

curtis4085 · Posted: Tue Mar 25, 2014 2:09 pm Post subject:

Evilrift · Posted: Sun Apr 06, 2014 2:10 pm Post subject:

It is uncanny that this is a recent post as I have identical questions. Does anyone know if you need the metal shaft retaining springs? The book says there's two of them but neither my 79 or 78 shrouds have them.. Anyone have a close up?

Evilrift · Posted: Sun Apr 06, 2014 2:38 pm Post subject:

Ok, I found a picture in Wilson (150) and will fab a piece up.

Randy in Maine · Posted: Sun Apr 06, 2014 2:42 pm Post subject:

Are you referring to the 2 little clips that hold the black "flap rod" in position?

Those are made of "spring steel" and require those little bushings near the flaps.

Evilrift · Posted: Sun Apr 06, 2014 3:24 pm Post subject:

What do you mean little bushings? The plastic pieces that sit in the valley?

I'm also not sure what spring steel is but I have some thin steel that I can cut up, and I assume since its just a safety to stop the rod from coming up and out of the valleys it shouldn't need to be much.

rustbus · Posted: Sun Apr 06, 2014 4:58 pm Post subject:

if you ever see some of the metal banding they use on shipping pallets, that's pretty stiff steel would be a good match for these little clips. free-as too.
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Randy in Maine · Posted: Sun Apr 06, 2014 7:25 pm Post subject:


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