Glue that resists heat?

[anthony1956]

and battery acid...

Do I hear "hot melt" ... ?

My Banner breather widget still leaks a bit, though not today, but the latest glue became liquid. 

Anthony

[OliverSedlacek]

Loctite Hysol 9492 is an epoxy rated for 180C and with good chemical resistance.

[Jonathan Kay]

What are the materials to be joined?

Loctite Hysol 9492 is an epoxy rated for 180C and with good chemical resistance.

That looks good to me: Loctite 9492. (I was just about to look for two-part epoxy adhesives with higher temperature tolerance than ordinary Araldite.)

The other family that might be worth looking at is high-temperature silicones, as used in exhausts etc nowadays.

Jonathan

[SM25T]

Is the heat from the primaries or the battery itself (!!) ? Melting glue ... Sounds serious !

[anthony1956]

well, it's hot in the engine bay.. but no more hot than usual

I suppose substances used so far at not truly glues. 

Superglue:Service Temperature: Up to 180°F (82°C) 

How hot is it in there under the bonnet by the battery? R500K remember.

 

What are the materials to be joined?

The battery and its breather - plastic?

[rj]

Hotmelt ought to do. If not the damage is limited, isn't it?

(The battery acid won't boil until 338 deg C so there is a chance you can get higher than 100, but I don't think you do.)

 

 

[Jonathan Kay]

The battery and its breather - plastic?

Probably OK with that epoxy adhesive... can you test first?

Jonathan

[elie boone]

I think it's more important to find a glue that withstand acid rather than temp. maybe better to heat up the widget and expand it a little.

[anthony1956]

why's it leaking if not reaching 338 deg c? (Hi rj! :-) ) or can it do that on right handers? (breather is on left if facing forwards) 

does epoxy resist acid?

 

 

 

BTW for future generations reading this, I use a kettle of boiling water to clean up the spilled acid. Carefully, works like magic, also check under the battery in its tray for acid.

[SM25T]

I fear alternator overcharging the battery .... especially as it is a high revving R500. Maybe a larger diameter alternator pulley is needed .... or a check on the control circuitry ?

[Jonathan Kay]

Why boiling? To remove the white crud?

I don't even use bicarbonate to "neutralise" battery acid, just lots and lots of (cold) water. And if there's crud then appropriate brushing.

...

does epoxy resist acid?

Probably.

Jonathan

[anthony1956]

no brushing required, using boiling (not just boiled) water was just instinctive, also only one kettle full.

Probably

Carlsberg it is then.

[anthony1956]

@Ian if it's overcharging would the volts be up at 13.8 when engine off? And when running it's 14.2 iirc.

[SM25T]

But we didn't measure it at 8000rpm !

[anthony1956]

I'll have a look next time out (Stack) :-)

[rj]

Ian,

If the regulator inside the alternator is OK, it should not overcharge regardless the revs.

However, if the regulator is blown, it could cause overcharging even at low RPM.

Anthony  I would expect gasses when charging a lead-acid battery. I can't tell why yours is leaking; it's been a long time since I swapped to Lithium batteries - you may remember my obsession with loosing weight...

 

[rj]

PS: If you have an earth-faliure the Stack may misread. ISTR the voltage regulator on the OEM alternator is built in and has it's return fed internally. If, however, the return is fed from the battery this could cause issues too.

 

/r

[anthony1956]

Hi rj :-)  hope all is well in Dane land.

far as I know it's not leaking, just breathing, but the breather is improperly sealed to thebatterybecausd I do not have the proper Banner spigot. 

Anthony