How to Resolve Possible Internal Engine Corrosion

[w113abudhabi]

My mechanic is currently working on a very low mileage 280SL that I own. The car has covered about 3000 miles in the past 15 years prior to my recent purchase and has issues arising through lack of use. The mechanic is currently replacing the timing chain, tensioner, upper rail and has noticed corrosion to internal aluminium components suggesting that previous owners may have used water rather the coolant in the car. He is concerned about the potential for future problems to arise as a result of this.

Can any members provide advice on what might be done to try and rectify this issue and avoid future problems arising?

Many thanks,

Pierre

[Benz Dr.]

This is the problem in places that never freeze; people often use water as their coolant. While it may work OK it will cause all sorts of corrosion if proper additives are not used. Anti freeze has all of these additives and in places where it does freeze, like around here, it takes care of most of these problems. I say '' most '' because lack of change outs over time will lead to the same problems as using straight water.

If you are really concerned, I would remove the cylinder head and have a look. Any corrosion can be ground out, new metal welded in, new water inserts installed, and the head can be milled flat. All of this will be a lot of work so you need to be sure the head is worth saving first if it has any damage.

[w113abudhabi]

Dr Benz, many thanks for your response. I'm afraid I've been away for a few days so apologies for my tardy thanks.

From now on and for the next 30 years or so during my expected ownership the car will have fresh Mercedes coolant in it. I imported the car from Florida. We will monitor things going forward and will be prepared for a head rebuild or replacement if required. Fingers crossed neither will be necessary and my bank balance will stay intact...