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Dynomite · 01-25-2014

The Oil Filter Adapter has many important functions. The Oil Filter Adapter is NOT for the sole purpose of holding/adapting the Oil Filter.

The oil paths through the Oil Filter Adapter Housing are describe in Item #5 below.

1. A Discussion of the Functions of the Oil Filter Adapter.
a. Control Oil Temperature. See Related ECM Code #52 Item #3 ZR1 ECM CODES 1990 TO 1992
b. Provide Sensor Feedback to the Instrument Panel.
c. Provide Oil Filtration.
d. Assure proper Oil Flow at any Oil Temperature.
e. Assure proper Oil Flow with contaminated Oil Filters.

The Oil Pressure Regulating Valve situated between the Oil Pump and Oil Filter Adapter controls and maintains Consistent Oil Pressure.

As an aside
2. Oil Pressure Sensor (Dash Gauge) Malfunction I changed out the oil pressure sensor for the dash gauge (top of oil filter) after engine installation. Oil pressure cold was registering 75 lbs. After changing out the oil pressure sensor, oil pressure is registering 55 lbs steady hot or cold and does not increase much with revs.

Oil Filter Adapter Sensors ..............................................Oil Filter Adapter Ports and Sensors

3. LT5 Oil Pressure and Oil Temperature Regulation

a. The Oil Pressure Regulation Valve (OPRV) (just after oil pump) opening pressure is 50-60 psi.

b. The Oil Cooler Bypass Valve on the Oil Filter Adapter allows oil to bypass the open oil cooler at hot temperatures since oil cooler is a bit restrictive. This valve raises the pressure a bit on the flow trying to bypass the oil cooler making sure some oil does go through the oil cooler.
c. The Oil Temperature Control Valve on oil filter housing opens oil flow from the oil cooler. The temperature opening characteristics of this valve are Thermostat-Open-203 degree F, Fully open-266 degree F.
d. The Oil Filter Bypass Valve on oil filter housing allows oil to bypass oil filter if the oil filter becomes to restrictive.
e. Oil pressure is always available to the Oil Cooler Bypass Valve. Oil flows from the oil pump (past the OPRV) to the oil filter through the Oil cooler and through the Oil Cooler Bypass Valve or directly through the Oil Temperature Control valve when the oil temperature is below 203 deg F. The oil cooler flow return and Oil Cooler Bypass Valve are open at the same time. The oil flow from the oil cooler is never totally blocked (half moon cutout of shuttle valve). The Oil pump flow at Idle is 1.6 gpm and the Oil pump flow at 7,000 rpm is 9.1 gpm.

4. Oil Filter Adapter Functional Details

Oil Temperature Control Valve Assembly.....................Oil Temperature Valve Thermostat opens at 203 deg F

Continued Next Page

Last UPDATE of post 13 Dec, 2018

01-25-2014	#13
Dynomite Join Date: Aug 2009 Location: South Dakota/California Posts: 3,788	Oil Filter Adapter Functions The Oil Filter Adapter has many important functions. The Oil Filter Adapter is NOT for the sole purpose of holding/adapting the Oil Filter. The oil paths through the Oil Filter Adapter Housing are describe in Item #5 below. 1. A Discussion of the Functions of the Oil Filter Adapter. a. Control Oil Temperature. See Related ECM Code #52 Item #3 ZR1 ECM CODES 1990 TO 1992 b. Provide Sensor Feedback to the Instrument Panel. c. Provide Oil Filtration. d. Assure proper Oil Flow at any Oil Temperature. e. Assure proper Oil Flow with contaminated Oil Filters. The Oil Pressure Regulating Valve situated between the Oil Pump and Oil Filter Adapter controls and maintains Consistent Oil Pressure. As an aside 2. Oil Pressure Sensor (Dash Gauge) Malfunction I changed out the oil pressure sensor for the dash gauge (top of oil filter) after engine installation. Oil pressure cold was registering 75 lbs. After changing out the oil pressure sensor, oil pressure is registering 55 lbs steady hot or cold and does not increase much with revs. Oil Filter Adapter Sensors ..............................................Oil Filter Adapter Ports and Sensors 3. LT5 Oil Pressure and Oil Temperature Regulation a. The Oil Pressure Regulation Valve (OPRV) (just after oil pump) opening pressure is 50-60 psi. b. The Oil Cooler Bypass Valve on the Oil Filter Adapter allows oil to bypass the open oil cooler at hot temperatures since oil cooler is a bit restrictive. This valve raises the pressure a bit on the flow trying to bypass the oil cooler making sure some oil does go through the oil cooler. c. The Oil Temperature Control Valve on oil filter housing opens oil flow from the oil cooler. The temperature opening characteristics of this valve are Thermostat-Open-203 degree F, Fully open-266 degree F. d. The Oil Filter Bypass Valve on oil filter housing allows oil to bypass oil filter if the oil filter becomes to restrictive. e. Oil pressure is always available to the Oil Cooler Bypass Valve. Oil flows from the oil pump (past the OPRV) to the oil filter through the Oil cooler and through the Oil Cooler Bypass Valve or directly through the Oil Temperature Control valve when the oil temperature is below 203 deg F. The oil cooler flow return and Oil Cooler Bypass Valve are open at the same time. The oil flow from the oil cooler is never totally blocked (half moon cutout of shuttle valve). The Oil pump flow at Idle is 1.6 gpm and the Oil pump flow at 7,000 rpm is 9.1 gpm. 4. Oil Filter Adapter Functional Details Oil Temperature Control Valve Assembly.....................Oil Temperature Valve Thermostat opens at 203 deg F Continued Next Page Last UPDATE of post 13 Dec, 2018 Last edited by Dynomite; 01-09-2019 at 07:55 PM.