Does the 36hp Air control ring fit a 40hp fan? and ring q's.

[BulliBill]

Yep, I've been told by "Virtanen" in Finland that the "wider" base bracket is correct for 25hp engines up to early 1952 if I recall correctly. Pretty cool... but it looks as if it could fit and work the same on any 36hp engine too.

Bill B
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[Stocknazi]

Interesting, I had forgotten that there was 40hp style thermostat bracket.

Never seen one with the fat base. Those crude spot welds are pretty cool.
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[BulliBill]

I found one of the "oddball" thermostat brackets, the other is still to be located in my stash...


Notice the stock narrower 30bhp/36hp bracket and then the much wider base bracket. I suspect that maybe this one fits 25hp or earlier engines?

Both are the round hole "non-adjustable" type, and both fit the same on a 36hp crankcase.


Bill Bowman
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I'm looking for these license plate frames for my fleet:
Coeur D'Alene - Lake Shore Volkswagen
Mission VW - San Fernando
Thornton VW - Stockton

Thanks for any help!

[Clara]

somewhere I have a box of NOS thermostat brackets that look a lot like the middle ones. I 'll try to find them. I think they had the p/n for the 36hp bracket on the box though, and might have been supplied as a replacement part, long enough ago that they had the old style markings on the box.

Yes, the ones marked 1500/1600 about have the oval slot for the mounting stud, so it can be adjusted by loosening the nut and moving it vertically.

(it also can be adjusted by screwing the thermostat up or down on the vertical rod)

The earlier ones have a round hole there.
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[BulliBill]

Using Mathew's photos above, take notice that the 30bhp/36hp black bracket (top) as well as the 34bhp/40hp black bracket (middle) both have what I call a "tail" or very short piece of the vertical bracket metal bent at a 90 degree angle to horizontal. This "tail" on both brackets wraps under the bottom edge of the crankcase. These two brackets also have a round hole drilled through them that slips nicely onto the thermostat mounting stud. So think about it, on these two types of brackets there is virtually no up/down adjustability of these brackets, they are fixed in position because of the round hole and bent "tail".

But notice that the bracket marked 1500-1600? in the photo (bottom) has the bent "tail" eliminated, and notice that the hole in the bracket for mounting to the crankcase stud is not round but elongated for some up/down adjustability on the later engines.

I hope that helps!

Bill Bowman

p.s. I've even found two other slightly different versions of these black painted thermostat brackets that I assume are for the earliest engines or maybe Porsche 356's? But that's a whole other story for another time...
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I'm looking for these license plate frames for my fleet:
Coeur D'Alene - Lake Shore Volkswagen
Mission VW - San Fernando
Thornton VW - Stockton

Thanks for any help!

[matthew henricks]

Hazetguy. You posted the below images in this thread.

https://www.thesamba.com/vw/forum/viewtopic.php?p=8365397&highlight=#8365397

Did you ever settle on which bracket was used for 40HP vs 1600 and is there a difference between 40HP stale and fresh air? (I am looking for a fresh air system right now)

Thank you
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Ambulance Fan's. https://www.thesamba.com/vw/forum/viewtopic.php?t=627707&highlight=

Parts i am looking for:
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[jbannon]

[thom]

[Busted-bolt]

Sometimes it is important to use extreme caution when applying heat to the area where the rod threads into the top goes into the thermostat or where the bottom bolt goes in to the thermostat, because there is lead solder in there and it melts at a relatively low temperature. The melted lead blobs will go inside the thermostat bellows and mess everything up.Ask me how I know,oops..
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I do all my own work,body,engine and transmission.

[sslick]

[EverettB]

The manual pic above appears to be a "Bastard 40" engine so maybe those use the same parts as a 36hp engine?

The pivot bracket shown in that shop manual scan is definitely the same part I've used on earlier 36hp engines.
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[sslick]

[sslick]

[BarryL]

It reads like you kept your thermostat contained in the bracket while heating. If you heat a good thermostat and it's not contained within the bracket it will ruin it as it expands beyond the brass folds' factory bend. Does your thermostat you heated with the heat gun still collapse fully when cold? How much distance is it that you could not pull down before? I thought you were supposed to bolt bracket then then use the bolt that goes into the thermostat to pull it down.

[sslick]

[hazetguy]

i'd like to update my previously incorrect statements above. i did some measurements between 36hp and 40hp thermostat parts, and here's what i've found:

for future reference:

Comparing 36hp to 40hp stale air thermostat parts.
Most parts are not interchangeable due to dimensional differences.
36hp on the top, 40hp on the bottom.

Aside from the thermostat throttle ring and its mounting hardware, and the thermostat bellows (for the most part), these are the pieces that are interchangeable between 36hp and 40hp:
Tension spring, mounting hardware for pivot piece, "C" clip that holds the throttle ring pivot piece to the stud, 15mm long bolt and flat washer for the thermostat bellows.

At a quick glance, the pivot piece looks the same. However, the arm is offset differently between 36hp and 40hp.
Theoretically you can use a 36hp arm on a 40hp, but not the other way around (it will hit the engine tin).
36hp on the top, 40hp on the bottom.

Dimensionally, the thermostat throttle ring pivot piece is longer on a 40hp.

Overall length of the throttle ring pivot stud is longer on a 40hp. Threaded part is nominally longer, but the non threaded portion is longer.

36hp is shorter, and the rod is fairly straight. It also has a shorter bend at the bottom.
40hp is longer, and incorporates more bends in it.
36hp on LEFT, 40hp on RIGHT.

[EverettB]

Yes, I didn't realize Gary still had some right now:
http://www.thesamba.com/vw/classifieds/detail.php?id=1244692
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[mrjonny5]

Thanks Everett, managed to find some in the classifieds as suggested

[EverettB]

I have it as 111 119 185

I don't believe they are available but they do pop up in the classifieds from time to time.
If you cannot find an original, I have also seen people selling this as a substitute (not perfect though):
Part # 823 253 149

From another thread

[mrjonny5]

Does anyone know the part number for the rubber stopper or where I can get one? Mine has perished and fallen off.

Thanks.