Dry Run Kit (Optional Extra); Scope Of Use - Hamilton Jet HJ212 Installation And Service Manual

Design Basics

Dry run kit (optional extra)

The dry run kit is an optional extra that can be fitted to the jet unit at the customer's request.
It is purchased at additional cost and should be requested when the initial jet order is placed.
The dry run system is typically used for man-overboard boats and lifeboats where the engines need to be
started before the vessel is in the water.
The dry run kit consists of a special marine bearing which can be run dry for short periods of time. Standard
rubber marine bearings cannot be run dry.

Scope of use

Because there is no cooling for a dry run system, the water seal and the marine bearing will heat up

rapidly when the vessel in not in the water.
Note the following limits to ensure adequate component life:

Maximum dry run time

Maximum dry run engine speed

Minimum time between dry runs

The dry run bearing will wear more rapidly than a standard bearing if used continuously in dirty water.
If possible, only use this system in clean water.
If long periods of use in dirty water is expected, then regular checks of the marine bearing wear will be
necessary.
3 minutes

1000rpm

1 hour

3-12
Installation and Service Manual