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My Luck with Coolant Hose Clamps! #4533448
10/03/17 11:56 PM
10/03/17 11:56 PM
Joined: Mar 2015
Posts: 488
Australia
B320i Offline OP
B320i  Offline OP
Joined: Mar 2015
Posts: 488
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.
Re: My Luck with Coolant Hose Clamps! [Re: B320i] #4533452
10/04/17 01:21 AM
10/04/17 01:21 AM
Joined: Nov 2012
Posts: 234
NorCal
Seventh Offline
Seventh  Offline
Joined: Nov 2012
Posts: 234
NorCal
Was the sealing surface for the flange on the head pitted and corroded? I've seen that before

Re: My Luck with Coolant Hose Clamps! [Re: Seventh] #4533474
10/04/17 04:35 AM
10/04/17 04:35 AM
Joined: Mar 2015
Posts: 488
Australia
B320i Offline OP
B320i  Offline OP
Joined: Mar 2015
Posts: 488
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.
Re: My Luck with Coolant Hose Clamps! [Re: B320i] #4533477
10/04/17 04:40 AM
10/04/17 04:40 AM
Joined: Nov 2006
Posts: 20,570
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,570
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.


ASE L1, Master. Deutsch Meisterbrief.
Re: My Luck with Coolant Hose Clamps! [Re: Trav] #4533482
10/04/17 04:57 AM
10/04/17 04:57 AM
Joined: Oct 2012
Posts: 339
North Carolina
Egg_Head Offline
Egg_Head  Offline
Joined: Oct 2012
Posts: 339
North Carolina
+1 BMW OEM clamps, then light a candle and say a prayer


1979 Garelli Rally Sport
2009 Cub Cadet LT1042
2002 BMW 540 M Sport (totaled)
2011 MB E350 4Matic wagon
1979 CJ-7
Re: My Luck with Coolant Hose Clamps! [Re: B320i] #4533492
10/04/17 05:18 AM
10/04/17 05:18 AM
Joined: Apr 2005
Posts: 597
NE Ohio
knerml Offline
knerml  Offline
Joined: Apr 2005
Posts: 597
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
2018 Hyundai Santa Fe Sport 2.0T Castrol Edge 5W40 & OEM/Mann W811/80 Filter
Re: My Luck with Coolant Hose Clamps! [Re: knerml] #4533519
10/04/17 06:03 AM
10/04/17 06:03 AM
Joined: Nov 2006
Posts: 20,570
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,570
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.


ASE L1, Master. Deutsch Meisterbrief.
Re: My Luck with Coolant Hose Clamps! [Re: Trav] #4533535
10/04/17 06:21 AM
10/04/17 06:21 AM
Joined: Apr 2017
Posts: 1,481
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline
Joined: Apr 2017
Posts: 1,481
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.

Last edited by mightymousetech; 10/04/17 06:23 AM.

Mighty Mouse Tech
BMW Tech, Former Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL
Re: My Luck with Coolant Hose Clamps! [Re: Trav] #4533550
10/04/17 06:47 AM
10/04/17 06:47 AM
Joined: Jun 2002
Posts: 6,439
MI
doitmyself Offline
doitmyself  Offline
Joined: Jun 2002
Posts: 6,439
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.

Re: My Luck with Coolant Hose Clamps! [Re: Egg_Head] #4533567
10/04/17 07:18 AM
10/04/17 07:18 AM
Joined: Dec 2005
Posts: 10,288
Upper Midwest
kschachn Online content
kschachn  Online Content
Joined: Dec 2005
Posts: 10,288
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.


1994 BMW 530i, 238K
1996 Honda Accord, 266K
1999 Toyota Sienna, 407K
2000 Toyota ECHO, 280K
Re: My Luck with Coolant Hose Clamps! [Re: mightymousetech] #4533577
10/04/17 07:32 AM
10/04/17 07:32 AM
Joined: Nov 2006
Posts: 20,570
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,570
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.


ASE L1, Master. Deutsch Meisterbrief.
Re: My Luck with Coolant Hose Clamps! [Re: B320i] #4533624
10/04/17 08:58 AM
10/04/17 08:58 AM
Joined: Nov 2012
Posts: 234
NorCal
Seventh Offline
Seventh  Offline
Joined: Nov 2012
Posts: 234
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

Last edited by Seventh; 10/04/17 09:01 AM.
Re: My Luck with Coolant Hose Clamps! [Re: B320i] #4533631
10/04/17 09:09 AM
10/04/17 09:09 AM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
Clovis, CA
You need constant tension hose clamps and Mayhew 28680 pliers to go with them. Problem solved.






Re: My Luck with Coolant Hose Clamps! [Re: B320i] #4533740
10/04/17 10:41 AM
10/04/17 10:41 AM
Joined: Oct 2002
Posts: 22,168
Colorado Springs
Drew99GT Offline
Drew99GT  Offline
Joined: Oct 2002
Posts: 22,168
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

Re: My Luck with Coolant Hose Clamps! [Re: B320i] #4533743
10/04/17 10:45 AM
10/04/17 10:45 AM
Joined: Oct 2002
Posts: 22,168
Colorado Springs
Drew99GT Offline
Drew99GT  Offline
Joined: Oct 2002
Posts: 22,168
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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