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Question Expansion Tank Leak

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2 years 2 months ago #1821 by frinkemon
frinkemon created the topic: Expansion Tank Leak
Hey All!

I've just replaced the radiator, front brace, some pipes etc and checked the expansion tank for leaks, and it seems to have a crack in the bottom.

I'm soldiering repairing it by welding the plastic together using a hot tool and then covering with epoxy resin. It's quite a small crack but does leak under pressure, does this sound like a reasonable fix?

Thanks,
Leigh

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2 years 2 months ago - 2 years 2 months ago #1826 by Propnut
Propnut replied the topic: Expansion Tank Leak
If it's still leaking after you've fixed it I'd say you haven't fixed it. It's always going to be gnawing away at the back of your mind as you drive along on a hot day so you're better off sourcing a good used one. Plenty turn up on EBay although some sellers appear to be funding the Greek governments debt repayments you should find one for reasonable money. Probably worth investing in a low coolant level alarm on your current tank in the meantime and swap it to the new one when you get it .
Last Edit: 2 years 2 months ago by Propnut.

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2 years 2 months ago #1827 by teenmal
teenmal replied the topic: Expansion Tank Leak
I agree with Propnut, and I would also recommend you fit a LCA if not already done so. You can purchase these units for a very reasonable price.

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2 years 2 months ago #1829 by frinkemon
frinkemon replied the topic: Expansion Tank Leak
Well I used a hot thing to melt the plastic around the leak and then scale it with a liberal coating of epoxy resin so I'll see how that holds.

Deffo fitting a coolant level alarm, but I'm going to build one myself as I want to monitor water/engine temp as well.

Thanks all!!

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2 years 2 months ago - 2 years 2 months ago #1838 by the1andonly
the1andonly replied the topic: Expansion Tank Leak
pragmatism or parannonia, the bongo cooling system needs a little of each that hopefully leads to a 3rd P
prepardness or preparation.
The 1st P says ok dismantle clean out the tank, dry out thouroughly and then try out your repair, and test thouroughly.
Test under pressure, I believe an old car or push bike valve can be inserted into the cap release pipe.
The 2nd P says buy another
the 3rd says do both.
test and fit the new one and use the old one for trials.


I'm interested in how you intend measuring the water temperature and where.The transistor switch on a stainless screw is tried and tested for level testing.

For my sins I hope I'm in the prepared bracket haveing had my fair dose of others paranioa.
I use an arduino and ds18 sensors to measure temperature in 5 places around engine and gearbox.
one being on the bottom feed hose (approx collent feed temperature)
I have a scav fan overide switch for heavy traffic jams and towing up steaphills.
the overflow from the pressure cap goes into a catch bottle with a simple float switch which will turn on a led in the cabin.
My next mod is to add led ( indicators on the 2 fan feed lines (red and blue/red on the feed connector to the fan.
Does this put me in the 2nd P or does "knowledge is power" fit?

Awaiting your ideas on temperature measurement.
Last Edit: 2 years 2 months ago by the1andonly.

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2 years 2 months ago #1842 by rooflifter
rooflifter replied the topic: Expansion Tank Leak
Any idea what caused the crack in the expansion tank in the first place? If it's a faulty unit then I would just replace it.

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