G'day Folks,

I've got a bit of powdery corrosion that's happening under some of the rubber hoses on my W201's cooling system. It isn't bad (as all) but I'd like to beat that little bugger down before it becomes a problem.

Assembly pastes such as Duralac are commonly used on aluminium (alloy) to steel connections. This stuff is well known in aircraft industry and also in the maritime world - but it doesn't seem to be suitable for anything that comes in contact with ethanol (coolant) and I'm not sure if it is suitable on plastics / rubber...

...so I'm looking for a product that is good for quite high temperatures - doesn't mind water / coolant / anti-freeze and will stop corrosion on aluminium alloys encased in rubber.

Anyone ever heard of such a beast?

__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

I had some of that on my w123. I had assumed it was calcium deposits from someone using tap water to fill the cooling system sometime before I got it. Not sure that it will really help you in this case, but i found some small packets of radiator hose grease and used those during reassembly. I think it was just silicone grease with a different label though.

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'85 300D - federal spec, built in late 84. 85 300D Complete AC System Rebuild

Something like one of these:

https://www.amazon.com/CORNING-MOLYKOTE-55-Silicone-Lubricant/dp/B00B2OHYMU

Russell 671570: Assembly Lube and Sealant Kit 1/2 oz Hose Assembly Oil | JEGS

Aeroquip FBM3553 Push-On Hose Fitting Lube

Its the aluminum corroding away. I clean it up and grease things with vaseline, or nothing. Eventually it will eat the housing away so much replacement will be required.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Thanks for the responses chaps - I've seen the "problem fitting your hose?" products but I really want something that will stop corrosion (like Duralac).

I've banged an email off to Hylomar to see if they can help. If I come up trumps I'll post back.

(Bit dodgy saying trump these days of course - not a political comment at all honest gov!)

__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

Well Hylomar says

Hylomar M

(same stuff I've been using on head gaskets - and other metal to metal contact surfaces)

BUT

If spraying it on let the acetone evaporate before you push on the rubber parts. The Hylomar "putty" apparently won't harm rubber but the acetone might.

So I'll be giving this a go

Already got some in house (even)!

__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!