diff --git a/docs/sphinx/source/whatsnew/v0.15.2.rst b/docs/sphinx/source/whatsnew/v0.15.2.rst
index 1f4524d893..dcff85d744 100644
--- a/docs/sphinx/source/whatsnew/v0.15.2.rst
+++ b/docs/sphinx/source/whatsnew/v0.15.2.rst
@@ -10,6 +10,15 @@ Breaking Changes
 
 Deprecations
 ~~~~~~~~~~~~
+* The function :py:func:`pvlib.clearsky._is_leap_year` is deprecated and will be
+  removed in v0.17.0. Use :py:func:`pandas.Timestamp.is_leap_year` instead.
+  (:issue: `2764`, :pull:`2766`)
+* The function :py:func:`pvlib.irradiance._liujordan` is deprecated and will be
+  removed in v0.17.0. (:issue: `2764`, :pull:`2766`)
+* The function :py:func:`pvlib.modelchain.get_orientation` is deprecated and will
+  be removed in v0.17.0. (:issue: `2764`, :pull:`2766`)
+* The method :py:meth:`pvlib.modelchain.ModelChain._prep_inputs_tracking` is
+  deprecated and will be removed in v0.17.0. (:issue: `2764`, :pull:`2766`)
 
 
 Bug fixes
@@ -62,3 +71,4 @@ Contributors
 * Cliff Hansen (:ghuser:`cwhanse`)
 * Arthur Onno (:ghuser:`ArthurOnnoTerabase`)
 * Adam R. Jensen (:ghuser:`AdamRJensen`)
+* :ghuser:`JoLo90`
diff --git a/pvlib/clearsky.py b/pvlib/clearsky.py
index 0f5ab63392..fd11a0d4cc 100644
--- a/pvlib/clearsky.py
+++ b/pvlib/clearsky.py
@@ -14,6 +14,7 @@
 
 from pvlib import atmosphere, tools
 from pvlib.tools import _degrees_to_index
+from pvlib._deprecation import deprecated
 
 
 def ineichen(apparent_zenith, airmass_absolute, linke_turbidity,
@@ -220,6 +221,13 @@ def lookup_linke_turbidity(time, latitude, longitude, filepath=None,
     return linke_turbidity
 
 
+@deprecated(
+    since="0.15.2",
+    removal="0.17.0",
+    name="_is_leap_year",
+    alternative=None,
+    addendum=None,
+)
 def _is_leap_year(year):
     """Determine if a year is leap year.
 
diff --git a/pvlib/iotools/bsrn.py b/pvlib/iotools/bsrn.py
index 3cb77b239e..21e497f38a 100644
--- a/pvlib/iotools/bsrn.py
+++ b/pvlib/iotools/bsrn.py
@@ -465,5 +465,5 @@ def read_bsrn(filename, logical_records=('0100',)):
     return content
 
 
-parse_bsrn = deprecated(since="0.13.0", name="parse_bsrn",
+parse_bsrn = deprecated(since="0.13.0",  removal="0.17.0", name="parse_bsrn",
                         alternative="read_bsrn")(read_bsrn)
diff --git a/pvlib/iotools/epw.py b/pvlib/iotools/epw.py
index dd46c50999..897337187b 100644
--- a/pvlib/iotools/epw.py
+++ b/pvlib/iotools/epw.py
@@ -311,5 +311,5 @@ def _parse_epw(csvdata, coerce_year=None):
     return data, meta
 
 
-parse_epw = deprecated(since="0.13.0", name="parse_epw",
+parse_epw = deprecated(since="0.13.0", removal="0.17.0", name="parse_epw",
                        alternative="read_epw")(read_epw)
diff --git a/pvlib/iotools/sodapro.py b/pvlib/iotools/sodapro.py
index be11dbf260..81212d8112 100644
--- a/pvlib/iotools/sodapro.py
+++ b/pvlib/iotools/sodapro.py
@@ -359,5 +359,5 @@ def read_cams(filename, integrated=False, label=None, map_variables=True):
     return data, metadata
 
 
-parse_cams = deprecated(since="0.13.0", name="parse_cams",
+parse_cams = deprecated(since="0.13.0", removal="0.17.0", name="parse_cams",
                         alternative="read_cams")(read_cams)
diff --git a/pvlib/irradiance.py b/pvlib/irradiance.py
index 5a4a76df25..791671a642 100644
--- a/pvlib/irradiance.py
+++ b/pvlib/irradiance.py
@@ -18,6 +18,7 @@
 
 from pvlib._deprecation import pvlibDeprecationWarning
 import warnings
+from pvlib._deprecation import deprecated
 
 
 # Deprecation warning based on https://peps.python.org/pep-0562/
@@ -3087,7 +3088,14 @@ def campbell_norman(zenith, transmittance, pressure=101325.0,
     return irrads
 
 
-def _liujordan(zenith, transmittance, airmass, dni_extra=1367.0):
+@deprecated(
+    since="0.15.2",
+    removal="0.17.0",
+    name="_liujordan",
+    addendum=None,
+)
+def _liujordan(zenith: pd.Series, transmittance: float,
+               airmass: float, dni_extra=1367.0) -> pd.DataFrame:
     '''
     Determine DNI, DHI, GHI from extraterrestrial flux, transmittance,
     and optical air mass number.
@@ -3106,11 +3114,11 @@ def _liujordan(zenith, transmittance, airmass, dni_extra=1367.0):
     transmittance: float
         Atmospheric transmittance between 0 and 1.
 
-    pressure: float, default 101325.0
-        Air pressure
+    airmass: float
+        Absolute airmass.
 
     dni_extra: float, default 1367.0
-        Direct irradiance incident at the top of the atmosphere.
+        Direct irradiance incident at the top of the atmosphere. [W/m²]
 
     Returns
     -------
@@ -3126,6 +3134,11 @@ def _liujordan(zenith, transmittance, airmass, dni_extra=1367.0):
     .. [2] Liu, B. Y., R. C. Jordan, (1960). "The interrelationship and
        characteristic distribution of direct, diffuse, and total solar
        radiation".  Solar Energy 4:1-19
+
+    .. deprecated:: 0.15.2
+        The ``_liujordan`` function is deprecated and will be
+        removed in 0.17.0.
+        Use the ``liujordan`` function instead.
     '''
 
     tau = transmittance
diff --git a/pvlib/modelchain.py b/pvlib/modelchain.py
index 45374bd6fa..999a35e1fc 100644
--- a/pvlib/modelchain.py
+++ b/pvlib/modelchain.py
@@ -63,7 +63,7 @@
 
 @deprecated(
     since="0.13.1",
-    removal="",
+    removal="0.17.0",
     name="pvlib.modelchain.get_orientation",
     alternative=None,
     addendum=None,
@@ -84,6 +84,10 @@ def get_orientation(strategy, **kwargs):
     Returns
     -------
     surface_tilt, surface_azimuth
+
+    .. deprecated:: 0.15.2
+        The ``get_orientation`` function is deprecated and will be removed
+        in 0.17.0.
     """
     if strategy == 'south_at_latitude_tilt':
         surface_azimuth = 180
@@ -1248,6 +1252,13 @@ def _prep_inputs_airmass(self):
             model=self.airmass_model)
         return self
 
+    @deprecated(
+        since="0.15.2",
+        removal="0.17.0",
+        name="Modelchain._prep_inputs_tracking",
+        alternative=None,
+        addendum=None,
+    )
     def _prep_inputs_tracking(self):
         """
         Calculate tracker position and AOI
diff --git a/pvlib/tracking.py b/pvlib/tracking.py
index 69c679ef79..e234887cd0 100644
--- a/pvlib/tracking.py
+++ b/pvlib/tracking.py
@@ -1,7 +1,7 @@
 import numpy as np
 import pandas as pd
 
-from pvlib.tools import cosd, sind, tand, acosd, asind
+from pvlib.tools import cosd, sind, tand, acosd
 from pvlib import irradiance
 from pvlib import shading
 from pvlib._deprecation import renamed_kwarg_warning
diff --git a/tests/test_clearsky.py b/tests/test_clearsky.py
index 687dd9133e..a984544c55 100644
--- a/tests/test_clearsky.py
+++ b/tests/test_clearsky.py
@@ -8,13 +8,15 @@
 
 import pytest
 from numpy.testing import assert_allclose
-from .conftest import assert_frame_equal, assert_series_equal
+from .conftest import (assert_frame_equal, assert_series_equal,
+                       fail_on_pvlib_version)
 
 from pvlib.location import Location
 from pvlib import clearsky
 from pvlib import solarposition
 from pvlib import atmosphere
 from pvlib import irradiance
+from pvlib._deprecation import pvlibDeprecationWarning
 
 from .conftest import TESTS_DATA_DIR
 
@@ -892,5 +894,13 @@ def test_bird():
     # XXX: testdata starts at 1am so noon is at index = 11
     np.allclose(
         [Eb3, Ebh3, Gh3, Dh3],
-        testdata2[['Direct Beam', 'Direct Hz', 'Global Hz', 'Dif Hz']].iloc[11],
+        testdata2[['Direct Beam', 'Direct Hz',
+                   'Global Hz', 'Dif Hz']].iloc[11],
         rtol=1e-3)
+
+
+@fail_on_pvlib_version('0.17.0')
+def test_is_leap_year_deprecation():
+    with pytest.warns(pvlibDeprecationWarning,
+                      match='will be removed in 0.17.0.'):
+        clearsky._is_leap_year(2020)
diff --git a/tests/test_irradiance.py b/tests/test_irradiance.py
index a416636ae9..b49dbb076d 100644
--- a/tests/test_irradiance.py
+++ b/tests/test_irradiance.py
@@ -14,6 +14,7 @@
 from .conftest import (
     assert_frame_equal,
     assert_series_equal,
+    fail_on_pvlib_version,
     requires_ephem,
     requires_numba,
 )
@@ -1454,3 +1455,11 @@ def test_diffuse_par_spitters():
         0.99591, 0.99576, 0.99472, 0.99270, 0.99283, 0.99406, 0.99581, 0.99591,
     ])  # fmt: skip
     assert_allclose(result, expected, atol=1e-5)
+
+
+@fail_on_pvlib_version('0.17.0')
+def test_liujordan_deprecation():
+    zenith = pd.Series([45.0, 50.0, 55.0])
+    with pytest.warns(pvlibDeprecationWarning,
+                      match='will be removed in 0.17.0.'):
+        irradiance._liujordan(zenith, transmittance=0.7, airmass=1.5)
diff --git a/tests/test_modelchain.py b/tests/test_modelchain.py
index 9ea804f014..7026a8ea3b 100644
--- a/tests/test_modelchain.py
+++ b/tests/test_modelchain.py
@@ -1,4 +1,5 @@
 import sys
+from unittest.mock import MagicMock
 
 import numpy as np
 import pandas as pd
@@ -10,7 +11,8 @@
 
 from pvlib._deprecation import pvlibDeprecationWarning
 
-from .conftest import assert_series_equal, assert_frame_equal
+from .conftest import (assert_series_equal, assert_frame_equal,
+                       fail_on_pvlib_version)
 import pytest
 
 
@@ -1799,12 +1801,36 @@ def test_invalid_models(model, sapm_dc_snl_ac_system, location):
         ModelChain(sapm_dc_snl_ac_system, location, **kwargs)
 
 
+@fail_on_pvlib_version('0.17.0')
 def test_bad_get_orientation():
-    with pytest.warns(pvlibDeprecationWarning, match='will be removed soon'):
+    with pytest.warns(pvlibDeprecationWarning,
+                      match='will be removed in 0.17.0.'):
         with pytest.raises(ValueError):
             modelchain.get_orientation('bad value')
 
 
+@fail_on_pvlib_version('0.17.0')
+def test_get_orientation_deprecation():
+    with pytest.warns(pvlibDeprecationWarning,
+                      match='will be removed in 0.17.0.'):
+        surface_tilt, surface_azimuth = modelchain.get_orientation('flat')
+    assert surface_tilt == 0
+    assert surface_azimuth == 180
+
+
+@fail_on_pvlib_version('0.17.0')
+def test_prep_inputs_tracking_deprecation(sapm_dc_snl_ac_system, location):
+    mc = ModelChain(sapm_dc_snl_ac_system, location)
+    # Set up mock results and system attributes required by the method
+    mc.results = MagicMock()
+    mc.system.singleaxis = MagicMock()
+    mc.system.axis_tilt = 0.0
+    mc.system.axis_azimuth = 180.0
+    with pytest.warns(pvlibDeprecationWarning,
+                      match='will be removed in 0.17.0.'):
+        mc._prep_inputs_tracking()
+
+
 # tests for PVSystem with multiple Arrays
 def test_with_sapm_pvsystem_arrays(sapm_dc_snl_ac_system_Array, location,
                                    weather):