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> Proper position of "cooling" flaps
SKL1
post May 18 2020, 08:50 PM
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Surprised there is no good picture in the factory workshop manual to show position of the flaps in the closed or open positions.
In this picture it is in the fail-safe position as if the cable or thermostat wasn't working. Just want to make sure they are correct.
When hooking up the thermostat wire the flaps would both move as the little "lever" would move down.
Just seems strange that in the fail-safe mode it covers up the oil cooler- you 'd think it would want air going over and through the cooler to allow the engine to run cooler if the thermostat failed...Attached Image
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bbrock
post May 18 2020, 08:54 PM
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It's actually not covering up the oil cooler. It is diverting air down through it. Reach behind there with your fingers and you will find about a half inch gap that diverts air to the bottom side of the flap and down through the cooler. Lift that flap and you will see that gap closes and all the air is diverted away from the cooler and over the top.
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cary
post May 18 2020, 08:56 PM
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https://bowlsby.net/914/Classic/zTN_Eng_Air..._Flaps-cold.jpg

https://bowlsby.net/914/Classic/zTN_Eng_Air..._Flaps-warm.jpg
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SirAndy
post May 18 2020, 09:13 PM
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QUOTE(SKL1 @ May 18 2020, 07:50 PM) *
Just seems strange that in the fail-safe mode it covers up the oil cooler

It does not "cover" the oil cooler, the flap in fact directs maximum air flow *to* the oil cooler in that position.
(IMG:style_emoticons/default/shades.gif)
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SKL1
post May 18 2020, 09:14 PM
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Thanks! I knew I had seen those somewhere before! How do we live without this source?? (IMG:style_emoticons/default/smile.gif)
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jim_hoyland
post May 18 2020, 09:32 PM
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How do you set the end of the wire in the clamp? Engine cold and wire slack. Wire tight ?
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iankarr
post May 18 2020, 09:43 PM
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QUOTE(jim_hoyland @ May 18 2020, 11:32 PM) *

How do you set the end of the wire in the clamp? Engine cold and wire slack. Wire tight ?

I like engine warm and wire not quite taut. this way you dont have to struggle pulling the flaps down to set...and you know that the wire is long enough to let the flaps fully open.
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falcor75
post May 18 2020, 09:44 PM
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Wire should be tight when the engine is cold since the thermostat expands and slackens the wire.
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mtndawg
post May 18 2020, 11:33 PM
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http://www.914world.com/bbs2/index.php?sho...=92436&st=0
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barefoot
post May 19 2020, 04:54 AM
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This might help as well:

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flipb
post May 19 2020, 05:33 AM
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QUOTE(jim_hoyland @ May 18 2020, 10:32 PM) *

How do you set the end of the wire in the clamp? Engine cold and wire slack. Wire tight ?


I just did this last weekend, using my 13 year old son as an extra set of hands. He held the bar in the "fully shut" position (you can get a tiny bit of leverage at the bend) while I pulled the thermostat cable taut with a pair of pliers and tightened the nut that locks it.
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BeatNavy
post May 19 2020, 06:04 AM
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I find the easiest way is to carefully put a heat gun on the bellows, watch for it to fully expand, and then go to the top, take the slack out, and tighten up the clamp.
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Craigers17
post May 19 2020, 06:05 AM
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QUOTE(barefoot @ May 19 2020, 04:54 AM) *

This might help as well:

Attached Image



That's a very helpful drawing. Thanks!
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Olympic 914
post May 19 2020, 07:08 AM
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QUOTE(falcor75 @ May 18 2020, 11:44 PM) *

Wire should be tight when the engine is cold since the thermostat expands and slackens the wire.


Since the default/Failure position is hot and the thermostat expands, I like to have cable slack in the hot position. That way you are sure the spring is holding it totally open.
it is only cold for a little while.
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porschetub
post May 19 2020, 02:48 PM
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QUOTE(BeatNavy @ May 20 2020, 12:04 AM) *

I find the easiest way is to carefully put a heat gun on the bellows, watch for it to fully expand, and then go to the top, take the slack out, and tighten up the clamp.


(IMG:style_emoticons/default/agree.gif) Rob best method,the cable should be firm not guitar string tight otherwise the bellows will be under strain and will split.
I tested the tension of the cable and found even with it a bit slack the air flaps were still working as they should.
Hot tip,replace the cable with a bike cable they are a larger diameter and move easier in the roller.
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BeatNavy
post May 19 2020, 02:58 PM
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QUOTE(porschetub @ May 19 2020, 04:48 PM) *

Hot tip,replace the cable with a bike cable they are a larger diameter and move easier in the roller.

Nice tip, Porschetub! (IMG:style_emoticons/default/smile.gif) I did not know that.
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andrewvolsen
post Nov 15 2026, 10:18 AM
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Edit: posted to wrong thread, sorry
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