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[tigers_gonads]

Mine has one not switching and the others are pretty slow so I've got acquired 4 known good ones off Rob.

Question is .............. is it worth cleaning these up on a wire wheel or best to just fit them ?
A couple are pretty shitty 

[zirk]

Mine has one not switching and the others are pretty slow so I've got acquired 4 known good ones off Rob.

Question is .............. is it worth cleaning these up on a wire wheel or best to just fit them ?
A couple are pretty shitty 

They should look dry and a kinda white powder'y coating on them I would just fit as is, if black or oil'y give them a clean. 

[philhoward]

Go anywhere near them with a wire brush or wheel and you've just turned a delicate instrument into a doorstop.

At very best, a wash with some carb cleaner, from a distance.

[Marks DTM Calib]

Two (mixture control ones, fixed pre-cat) should be switching at about one second intervals when hot, the other two (cat efficiency monitoring ones, fixed inbetween pre and main cat) shoudl not switch (unless the pre cat is goosed).

[tigers_gonads]

Two (mixture control ones, fixed pre-cat) should be switching at about one second intervals when hot, the other two (cat efficiency monitoring ones, fixed inbetween pre and main cat) shoudl not switch (unless the pre cat is goosed).

I've got a pair of converted 3ltr cats from daz on it Mark.
He did warn me that they were slow.
I noticed that one of them (can't remember which one) was permanently lean.
Its pishing down at the moment, i'll plug in later and report back 

Thanks 

[Kevin Wood]

I would not try to clean them with anything. Many chemicals can destroy them so carb cleaner is out. They will get hot enough in the exhaust that anything significant will get burnt off. Just fit them as they are.