Various spare parts are available for Vetus Diesel M4.55 and M4.56 heat exchanger assemblies.
Please note that the design of the heat exchanger filler cap has changed in 2019 and the original metal cap is no longer available.
The new plastic cap is used for heat-exchanger cooled engines and keel-cooled engines, regardless of whether they have a calorifier or expansion tank fitted.
The cap vents at 1.0 bar and a small length of pipe can be used to drain any coolant overflow into the bilge.
The new filler cap MUST be used with the new-design filler neck - please order a filler neck as well if you require one: this is screwed into the heat exchanger housing and replaces the original filler neck (which may have been pressed into the housing).
Spare parts include:
STM7551 - heat exchanger housing
*STM7552 - heat exchanger complete
STM7825 - heat exchanger manifold gasket
STM7476 - injection bend gasket
STM6113 - o-ring (2 required)
STM7452 - injection bend hose
18-14715 - filler cap
18-14649 - filler neck
STM6503 - end cap with hose connections
STM7446 - end cap blank
* this part may have an extended lead time - please confirm with us before ordering
