Heat exchanger

[fondav8super]

Hi guy's I am new to this site and to be honest new to boats in general....
I have a couple of issues as i am re-building my Rover V8 supercharged Fonda with a pp jet drive.. The first time i took this out it overheated, so I eventually decided to re-build the topend which proved that the head gaskets had indeed gone, however as i want to do a proper job I need to know where or what is the best cleaner for the heat exchanger as it seems really scaled up, it looks as though it brass so I dont want to use anything that will corrode it at the same time...
also where is the best place to get U fender for around the edge of the boat??

[PAR]

Retail brands of scale remover will become your second career on this project. Have the exchanger boiled out at a radiator shop. It doesn't cost much and you'll have a sanitary piece when it's finished.

The rub rail (my assumption) can be had in varying shapes and materials, from rope to extruded aluminum. There are a few suppliers around, try Jamestown Distributors for a go idea of the selection available.

[anthony goodson]

In the UK Portmere Rubber at Southampton may help or ASAP Supplies are online. To avoid your head gasket problem re occuring keep a very strong solution of anti corrosion/antifreeze in the closed system at all times.

[fondav8super]

Thanks Antony and Par for the info, I will fully investigate all your great suggestions and keep you posted, n hopefully will be testing next Monday morning woo hoo!!! n fingers crossed..... sounded great with the h-gaskets gone should sound even better now.......YouTube - fonda v8 supercharged jetboat

[anthony goodson]

It only just occured to me ,you do of course have a filter in the water feed line from your jet to your cooling system ?

[fondav8super]

actually no I don't - should there be ??? you would think so but what type would I get, as I said I am new to this and really am wet behind the ears..

[anthony goodson]

You must have a filter fitted or your oilcooler/heat exchanger will block again very quickly. The problem you have is that most inlet filters are designed to work on the suction side of a pump ,not on the pressure side ,as on a jet, I have used a a Spanish filter,used on their commercial irrigation systems, with great success, your setup however ,a blown V8 on a small pump ,may produce more pressure than this could cope with. Contact ASAP supplies they have a very comprehensive catalogue. This filter is more important on a jet ,as there is nothing in the system to macerate weed algae etc ,and quite substantial amounts find their way in.

[fondav8super]

well thank god I hadn't taken it out again, when i cleaned everything there was allsorts in there!!!!!, I will call them tomorrow... thanks so much for the advise....

[anthony goodson]

If you fit it below the waterline you will need to incorporate a tap ,so that you can clean it whilst afloat. Beware the standard circular filter with a transparent plastic lid they can leak under pressure.