Descaleing Outboard with Rydlyme - A better method

[Bigplumbs]

Well after having our day out aborted yesterday cos the overheat alarm came on on the 60hp 2 stroke Mariner. I found that the thermostat was not working. New one on order. I also decided on a better way to use Rydlyme as it is so expensive and you get so little you have to make sure you circulate with minimum loss of liquid and max efficiency.

Very short video below showing my 'better method' than my previous one

 

[BB1]

Well after having our day out aborted yesterday cos the overheat alarm came on on the 60hp 2 stroke Mariner. I found that the thermostat was not working. New one on order. I also decided on a better way to use Rydlyme as it is so expensive and you get so little you have to make sure you circulate with minimum loss of liquid and max efficiency.

Very short video below showing my 'better method' than my previous one

Why can't cheaper Kilrock be used, is it too aggressive?

 

[Bigplumbs]

Why can't cheaper Kilrock be used, is it too aggressive?

Never tried that one, But I know Rydlyme works

 

[benjenbav]

Interesting. But I wonder if you’re losing the flush benefits by recirculating a solution of rydlyme, scale and water?

 

[jrudge]

You are supposed to recirculate. However hcl dissolves aluminium so whilst I use liberal amounts on hcl on heat exchangers there is no way I would get it anywhere near an aluminium outboard.

What happens when aluminium reacts with hydrochloric acid? | Socratic

 

[Bigplumbs]

Interesting. But I wonder if you’re losing the flush benefits by recirculating a solution of rydlyme, scale and water?

Thats how you are supposed to use it

 

[Bigplumbs]

You are supposed to recirculate. However hcl dissolves aluminium so whilst I use liberal amounts on hcl on heat exchangers there is no way I would get it anywhere near an aluminium outboard.

What happens when aluminium reacts with hydrochloric acid? | Socratic

But that is what people use. How would you descale if it is not possible to dismantle. Remember old outboards have bolts that when a spanner is applied they just break and then you are in a worse place

 

[paradave]

I think in 50/50 mix with water it’s ok for alu? Check the spec sheets but im sure I’ve read that before.

 

[Bigplumbs]

I think in 50/50 mix with water it’s ok for alu? Check the spec sheets but im sure I’ve read that before.

That is indeed the spec and in all honestly if you only buy 1 ltr (£24) you will actually need more than an extra ltr as you need about 2.5 - 3 ltr in total to keep a circulation going. I have just bought 5 ltrs (£76) as I have another 2 older outboards to do.

Putting a spanner on certain bolts on older outboards can sometimes spell disaster