PMS 4500 FCB Manual - Ysebaert

Maintenance Instructions
B.8 Coolant connection block at generator housing
Monitoring of the coolant connection block as sacrificial anode
At all raw watercooled aggregates the coolant connection block at the side of the generator housing
must be well controlled. This coolant connection block is manufactured from a special aluminum
alloy and serves also as sacrificial anode. If by the influences of electrical DC voltage the
aluminum alloy of the generator is endangered, first the coolant connection block is concerned. If
visibly corrosion is identifiable from the outside of the coolant connection block, the block must be
changed in regular intervals (at least once per year). In this case the coolant connection block is
to be seen as wearing part. It should always be available in each case as spare part on board.
In order to protect the generator housing
against corrosion and against elecrolysis,
the connection block with the cooling
water connecting pieces takes the
function of a sacrificial anode.
Replacement of the coolant connection block
The coolant connection block is put on with a "Spezial" sealant. The fixing bolts are not intended
in order to stretch the coolant connection block closely on the surface area. These screws serve
only for the adjustment of the coolant connection block until the sealant is hardened and it reached
its final firmness. The fixing bolts may be tightened therefore only sturdy.
ATTENTION! At the side the fixing bolts with an electrically neutral fat (e.g. anti seize)
must be used. If the fixing bolts (high-grade steel) turned in without this fat into the aluminum
threads, the danger of a corrosion exists, and it is possible that the thread root out
when unscrewing the screws.
Page 24 PMS_4500_FCB_manual.V02 - Chapter B: Maintenance Instructions 15.7.05