Perkins 4108 anodes

[Roberto]

My present boat has a Perkins 4108, like the previous one.

The previous engine had no anodes, as some 4108 were fitted with anodes: where do I look for in the new engine to check if it has them ?

The previous owner could not tell..

thanks

 

[pessimist]

You now have me worried - I was not aware that the 4108 had anodes. Is yours direct or indirect cooling? Hoping to visit the boat this weekend. Will check the manual and report back.

 

[Roberto]

Mine is fresh water cooled, with heat exchanger.

AFAIK, many engines were originally electrically insulated from the sea (in theory, cooling sea water offered a path for current anyway): negative return to battery, etc so they were not fitted with anodes; but there were other engines which were supposed to be grounded and accordingly were fitted with anodes, for ex at the heat exchanger.

I looked at my engine and there are a few bolt heads here and there that could be those hiding an anode, but before unscrewing anything I wanted to be sure.

My version of the manual does not say anything about anodes..

 

[pessimist]

Mine is also indirect. I would assume that indirect cooling would make engine anodes redundant. Hope so anyway.

 

[Roberto]

actually heat exchangers, often being made of dissimilar metals (sometimes copper tubing too), were among the reasons for fitting anodes..

 

[silverseal]

I have had several 4107/8 engined boats, none have had anodes, and my manuals does not mention them.
My current one has an additional anode along side the rope cutter on the propellor shaft, and a copper earthing strand between the two.
Hope that helps

 

[sailorman]

Do u Have a TMP gearbox.
if so u should change the existing raw water inlet / out-let
nipples that the cooling pipes are attached to ( the originals were brass / gun-metal ) these r now made in zinc as the raw water cooling fitted by Duffields have a mixture of copper pipes + Alloy gearbox housings. this equates to a battery i had to have a gearbox rebuild @ £1100.00. /forums/images/graemlins/shocked.gif /forums/images/graemlins/shocked.gif

<font color="red"> i still have a set of spare zinc anodes if anybody wants them @ a reasonable price as i have re-engined & there not now required </font> /forums/images/graemlins/wink.gif /forums/images/graemlins/wink.gif

 

[Roberto]

thanks silverseal,

indeed, apparently anodes are not the most important pieces for these engines -.<)

 

[Roberto]

it is a Hurth gear,

it does not show any exterior sign of corrosion ..

thanks r