Replacing AAV.... do I need Loctite?

1971-1989: 280SL, 280SLC, 300SL, 350SL, 350SLC, 380SL, 380SLC, 420SL, 450SL, 450SLC, 450SLC 5.0, 500SL, 500SLC, 560SL
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TheMadRacoon
C 111
Posts: 850
Joined: Sun 25 Nov, 2012 11:34 am
Model you own: w107
Location: Melbourne

Replacing AAV.... do I need Loctite?

Post by TheMadRacoon » Thu 17 Jul, 2014 11:04 am

I am replacing the AAV on the 350SLC. I will replace the spring washers on the hold down machine screws, and adding a new gasket that came with the AAV. The screws came out easily and there was no sealant or loctite on the thread.

Should I add loctite or anything else when I reattach? The threaded mounting holes are blind, presumably; the threaded holes are not in contact with the coolant.

Any advice appreciated before I go ahead.

Oh yeah, I did test the replacement AAV though I didn't have a thermometer to hand (used measured amounts of ambient & boiling water as a rough measure. Just boiled water closed the AAV so that the air flow was reduced significantly, ie maybe to a tenth).

Keeping my fingers crossed.
Emad,
TheMadRacoon
1975 350SLC Astral Silver (725) / Blue (2012, 284,900 km - present.... a real Benz, getting better and better)
1988 190E Deep Blue (900) / Cream (2006, 190,000 km - 2007, ~ 215,000 km .... FSH and still spent big $$$)
1974 280E Reed Green (860) / Bone (1993, 316,700 km - 2004, ~490,000 km and still A1)

User avatar
TheMadRacoon
C 111
Posts: 850
Joined: Sun 25 Nov, 2012 11:34 am
Model you own: w107
Location: Melbourne

Re: Replacing AAV.... do I need Loctite?

Post by TheMadRacoon » Thu 17 Jul, 2014 1:43 pm

Strangely, the mounting holes in the replacement AAV are a fraction too small for the screws, and I also couldn't get the original spring washers off the screws, so I'll just add the new spring washers below the originals. Can't see a problem with that.

A big thanks to Rolf and Neil at FW Graunke for drilling out the holes (straight) for me :)
Emad,
TheMadRacoon
1975 350SLC Astral Silver (725) / Blue (2012, 284,900 km - present.... a real Benz, getting better and better)
1988 190E Deep Blue (900) / Cream (2006, 190,000 km - 2007, ~ 215,000 km .... FSH and still spent big $$$)
1974 280E Reed Green (860) / Bone (1993, 316,700 km - 2004, ~490,000 km and still A1)

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