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#4533448 - 10/04/17 12:56 AM My Luck with Coolant Hose Clamps!
B320i Offline


Registered: 03/18/15
Posts: 482
Loc: Australia
With the help of a friend, I recently replaced the heater hose, flange and flange gasket (paper) on the back of my BMW's M50 engine. Given this necessitated removal of the manifold, it wasn't exactly a "fun" repair. Here is a photo of the 24 year old, leaking heater hose: http://gdurl.com/mQPC

Anyway, we got it all back together again, bled the cooling system and things were fine for the first few drives. After several drives, I noticed there was a slight weep from the hose or the flange itself again. By a couple of drives later, it was leaking enough to drip on the ground...

Now, if this were a sealing issue on the water flange itself, that would've manifested straight away, I think. I've had plenty of issues with worm-drive hose clamps expanding after a few drives and beginning to seep - I'm just wondering if anyone else has had the issue?
I don't tighten things down as hard as I can (I could've, given this is a metal flange), but the hose was by no means loose.

Any suggestions? I've got another six hoses to replace shortly, all of which are far more accessible. However, I'd like to avoid this irritating phenomenon if I can!

Makes me wonder how mechanics can remove and reseat coolant hoses everyday without having things start seeping everywhere.
_________________________
'93 BMW 320i 217,000km - Valvoline Engine-Armour 15w40, Mann Filter.

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#4533452 - 10/04/17 02:21 AM Re: My Luck with Coolant Hose Clamps! [Re: B320i]
Seventh Offline


Registered: 11/11/12
Posts: 234
Loc: NorCal
Was the sealing surface for the flange on the head pitted and corroded? I've seen that before

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#4533474 - 10/04/17 05:35 AM Re: My Luck with Coolant Hose Clamps! [Re: Seventh]
B320i Offline


Registered: 03/18/15
Posts: 482
Loc: Australia
Originally Posted By: Seventh
Was the sealing surface for the flange on the head pitted and corroded? I've seen that before

Nope, used a brand new flange as I anticipated the old one would be old and crusty.
_________________________
'93 BMW 320i 217,000km - Valvoline Engine-Armour 15w40, Mann Filter.

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#4533477 - 10/04/17 05:40 AM Re: My Luck with Coolant Hose Clamps! [Re: B320i]
Trav Offline


Registered: 11/20/06
Posts: 18911
Loc: MA, Mittelfranken.de
I always coat the flange with a little Hylomar M before putting the hose on. It doesn't harden so removing the hose later is no problem and is superior to silicone or #2, it will never leak again.
Use a constant tension clamp in place of worm clamps, the OE BMW worm clamps are much better than the five and dime junk available in parts stores these days but are not as good as constant tension ones, the only downside with them is price.
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#4533482 - 10/04/17 05:57 AM Re: My Luck with Coolant Hose Clamps! [Re: Trav]
Egg_Head Offline


Registered: 10/07/12
Posts: 284
Loc: North Carolina
+1 BMW OEM clamps, then light a candle and say a prayer
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#4533492 - 10/04/17 06:18 AM Re: My Luck with Coolant Hose Clamps! [Re: B320i]
knerml Offline


Registered: 04/05/05
Posts: 481
Loc: NE Ohio
German OEM's use spring tension clamps. They automatically adjust to changes in the hose over time.

https://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2555940
_________________________
2015 Hyundai Elantra Sport 2.0 GDI Mobil 1 5W20 & OEM/Mann W811/80 Filter
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#4533519 - 10/04/17 07:03 AM Re: My Luck with Coolant Hose Clamps! [Re: knerml]
Trav Offline


Registered: 11/20/06
Posts: 18911
Loc: MA, Mittelfranken.de
Originally Posted By: knerml
German OEM's use spring tension clamps. They automatically adjust to changes in the hose over time.

https://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2555940


Really?

https://www.ecstuning.com/b-genuine-bmw-parts/hose-clamp-worm-gear-stainless-steel/07129952113/

German OE can be crimp, worm or spring, they use many types.
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#4533535 - 10/04/17 07:21 AM Re: My Luck with Coolant Hose Clamps! [Re: Trav]
mightymousetech Offline


Registered: 04/03/17
Posts: 1444
Loc: Ontario, Canada
Originally Posted By: Trav
Originally Posted By: knerml
German OEM's use spring tension clamps. They automatically adjust to changes in the hose over time.

https://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2555940


Really?

https://www.ecstuning.com/b-genuine-bmw-parts/hose-clamp-worm-gear-stainless-steel/07129952113/

German OE can be crimp, worm or spring, they use many types.



Usually any hose that carries coolant, which causes a large temperature variance, will not have a gear clamp. A gear clamp will not maintain constant tension during heat/cool cycles. So you will only find gear clamps on things like fuel hoses and such.

Never use gear clamps on anything that gets hot.


Edited by mightymousetech (10/04/17 07:23 AM)
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#4533550 - 10/04/17 07:47 AM Re: My Luck with Coolant Hose Clamps! [Re: Trav]
doitmyself Offline


Registered: 06/03/02
Posts: 6232
Loc: MI
Originally Posted By: Trav
I always coat the flange with a little Hylomar M before putting the hose on. It doesn't harden so removing the hose later is no problem and is superior to silicone or #2, it will never leak again.
Use a constant tension clamp in place of worm clamps, the OE BMW worm clamps are much better than the five and dime junk available in parts stores these days but are not as good as constant tension ones, the only downside with them is price.


Trav, why the Hylomar M vs. the universal blue? Their website implies that the blue is the more "go to" product. I have never used either. Thanks.

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#4533567 - 10/04/17 08:18 AM Re: My Luck with Coolant Hose Clamps! [Re: Egg_Head]
kschachn Offline


Registered: 12/26/05
Posts: 9420
Loc: Upper Midwest
Originally Posted By: Egg_Head
+1 BMW OEM clamps, then light a candle and say a prayer

I haven't had a problem at all with the BMW OEM clamps (typically NORMA brand). Despite my personal attraction to the spring clamps on my Asian cars, I have to say the BMW ones haven't leaked either.
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#4533577 - 10/04/17 08:32 AM Re: My Luck with Coolant Hose Clamps! [Re: mightymousetech]
Trav Offline


Registered: 11/20/06
Posts: 18911
Loc: MA, Mittelfranken.de
Originally Posted By: mightymousetech
Originally Posted By: Trav
Originally Posted By: knerml
German OEM's use spring tension clamps. They automatically adjust to changes in the hose over time.

https://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2555940


Really?

https://www.ecstuning.com/b-genuine-bmw-parts/hose-clamp-worm-gear-stainless-steel/07129952113/

German OE can be crimp, worm or spring, they use many types.



So you will only find gear clamps on things like fuel hoses and such.

Never use gear clamps on anything that gets hot.


Lots of companies use worm clamps OE on cooling systems, they are cheap, look at more than domestics. Notice BMW uses a protective sleeve on this larger hose. Honda uses worm clamps almost exclusively on every coolant hose on some of their bikes. I agree they are not the best option by far.



Originally Posted By: doitmyself
Trav, why the Hylomar M vs. the universal blue? Their website implies that the blue is the more "go to" product. I have never used either. Thanks

All the Hylomar blue products are very similar but the M is slightly thicker and less runny, you can find it on ebay cheaper than Amazon. Once you use it you will never be without it.
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ASE L1, Master. Deutsch Meisterbrief.

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#4533624 - 10/04/17 09:58 AM Re: My Luck with Coolant Hose Clamps! [Re: B320i]
Seventh Offline


Registered: 11/11/12
Posts: 234
Loc: NorCal
[quote=B320i
Nope, used a brand new flange as I anticipated the old one would be old and crusty.[/quote]

I was asking about the surface on the head.

And BMW has always used only worm gear clamps or oetiker clamps up until E46 was introduced.

Edit: I'm a big fan of hylomar products as well, also there is an equivalent version made by wurth, called DP 300


Edited by Seventh (10/04/17 10:01 AM)

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#4533631 - 10/04/17 10:09 AM Re: My Luck with Coolant Hose Clamps! [Re: B320i]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
You need constant tension hose clamps and Mayhew 28680 pliers to go with them. Problem solved.






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#4533740 - 10/04/17 11:41 AM Re: My Luck with Coolant Hose Clamps! [Re: B320i]
Drew99GT Offline


Registered: 10/11/02
Posts: 22130
Loc: Colorado Springs
I just dealt with this very issue a month ago; the easiest and most readily available option is constant tension worm gear clamps; Napa usually has them in stock or can get them in a day; same with Oreilly Auto. They are easy to install without having to remove the hose.

https://bobistheoilguy.com/forums/ubbthr...gear_hos#UNREAD

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#4533743 - 10/04/17 11:45 AM Re: My Luck with Coolant Hose Clamps! [Re: B320i]
Drew99GT Offline


Registered: 10/11/02
Posts: 22130
Loc: Colorado Springs
Oops, I see you're in Australia. You can order the constant tension worm gear clamps if you can't find them locally.

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