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      10-01-2017, 07:38 PM   #1
psubmw
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2011 E90 bolt installation on the engine side of HVAC box help

I'm reinstalling the HVAC box and I because I was excited to start putting it back together, I didn't pay attention to how the bolt through the firewall works with the left handed threaded fitting on the back of the HVAC box.

There is a typical right hand threaded bolt that goes through the highlighted, left hand threaded fitting. The left handed threaded fitting screws into the backside of the HVAC box.

I have the bolt installed and the box is a little loose just like it was before I removed it, but it definitely isn't tight enough against the firewall since the blower motor isn't tight enough against the HVAC air intake.

Can anyone explain why there's the left hand threaded fitting, and how to properly install the box using the bolt?
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      10-02-2017, 07:02 PM   #2
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Are you talking about the t27 on the firewall
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      10-02-2017, 07:07 PM   #3
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Quote:
Originally Posted by Bavarian Tech View Post
Are you talking about the t27 on the firewall
I believe so, yes. I just removed it, checked the reverse threaded collar, and reinstalled it. I still have no idea what the reverse threaded thing does or if I installed it correctly. Yes, the bolt does hold the box in place a little, as it should, though.
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      10-02-2017, 07:24 PM   #4
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The threads aren't reversed threaded..
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      10-02-2017, 07:25 PM   #5
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Quote:
Originally Posted by Bavarian Tech View Post
The threads aren't reversed threaded..
The T27 BOLT is not. But the collar I highlighted is.
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Last edited by psubmw; 10-02-2017 at 07:30 PM. Reason: Added bolt picture
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      10-02-2017, 07:49 PM   #6
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Isnt it pressed into the box housing
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      10-02-2017, 09:57 PM   #7
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The collar threads into the box housing, yes. But as you tighten the T27 bolt through the collar, aren't you loosening the reverse threaded collar as you tighten the bolt into the housing?
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      10-03-2017, 11:05 AM   #8
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Quote:
Originally Posted by psubmw View Post
The collar threads into the box housing, yes. But as you tighten the T27 bolt through the collar, aren't you loosening the reverse threaded collar as you tighten the bolt into the housing?
I've never had an issue with the insert, in 10 years..If its spinning you could try some super glue to hold in it n place to prevent it from spinning or just F the bolt..their's still 4 other bolts holding the box to the support bar
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