diff --git a/test/functional/api/cas/cas_service.py b/test/functional/api/cas/cas_service.py
new file mode 100644
index 0000000..18004ad
--- /dev/null
+++ b/test/functional/api/cas/cas_service.py
@@ -0,0 +1,42 @@
+#
+# Copyright(c) 2022 Intel Corporation
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+from pathlib import Path
+from datetime import timedelta
+from string import Template
+from textwrap import dedent
+
+from test_tools.fs_utils import check_if_directory_exists, create_directory, write_file, remove
+from test_utils.systemd import reload_daemon
+
+opencas_drop_in_directory = Path("/etc/systemd/system/open-cas.service.d/")
+test_drop_in_file = Path("10-modified-timeout.conf")
+
+drop_in_timeout_template = Template(
+    dedent(
+        """
+        [Service]
+        ExecStart=
+        ExecStart=/bin/sh -c '/usr/bin/echo "Default open-cas.service config overwritten by test!" > /dev/kmsg'
+        ExecStart=-/sbin/casctl settle --timeout $timeout --interval 1
+        TimeoutStartSec=$timeout
+        """
+    ).strip()
+)
+
+
+def set_cas_service_timeout(timeout: timedelta = timedelta(minutes=30)):
+    if not check_if_directory_exists(opencas_drop_in_directory):
+        create_directory(opencas_drop_in_directory, parents=True)
+
+    contents = drop_in_timeout_template.substitute(timeout=timeout.seconds)
+
+    write_file(str(opencas_drop_in_directory / test_drop_in_file), contents)
+    reload_daemon()
+
+
+def clear_cas_service_timeout():
+    remove(opencas_drop_in_directory, force=True, recursive=True, ignore_errors=True)
+    reload_daemon()