MOROSO 22187 Hi-Pump Volume Wet Sump Oil Pump and Pick Up Instruction Manual
- June 4, 2024
- MOROSO
Table of Contents
22187 Hi-Pump Volume Wet Sump Oil Pump and Pick Up
Instruction Manual
OIL PUMP AND PICKUP
INSTALLATION INSTRUCTIONS
CLEANLINESS
Be sure to thoroughly clean oil pump inside and out to eliminate any dust or
dirt that might be present. Submerge the pump in clean oil and rotate the
gears by hand before installing the pump.
Bolting to Main Cap or Block Flange
Check the machined surface of oil pump and main cap/block flange for flatness
and cleanliness. It’s important that these surfaces are prepared to
mechanically seal the two components together. Any issues with this contact
area will result in oil leakage and a lack of pressure If dowel pins are used
for pump alignment they must be in good condition to prevent misalignment and
burrs, Replace any damaged dowel pins. When installing the oil pump it is
important to use the correct fasteners and torque values for your engine.
CHECKING ENDPLAY
After the pump is installed on the engine, install the distributor and check
the endplay of the oil pump drive shaft. Between .020″ to .125″ is acceptable.
If no endplay is present, corrective measures must be taken or the pump drive
gear will score the pump cover causing premature pump failure and possible
bearing problems. Once the endplay is correct, check for drive shaft clearance
with the main cap access hole and any passage through the block for
interference.
NOTE: On standard & high volume pumps, a new intermediate shaft with a
pinned steel sleeve must be used. Moroso and other manufacturers offer drive
shafts with steel sleeves. If the steel sleeve is not used, the oil pump can
be damaged, resulting in failure of the pump and a loss of oil pressure.
Failure to follow this warning voids any warranty of this product.
OIL PAN TO PICKUP CLEARANCE
Before the final installation of the oil pan, check the clearance between the
pump pickup screen and the pan bottom as follows:
-Bolt the pump to the engine. Place a straight edge on the pick up and measure the distance from the block’s pan rail to the straight edge.
Some pick-ups will have a slight angle, so there could be two different
heights. Take the average of the two, and record this measurement as pickup
height.
-Then measure the distance from the oil pan bottom to the pan rail. Record this measurement as pan depth.
-Subtracting the pickup height from the pan depth gives you the oil pan-to-pickup clearance (not including gasket thickness). Measure your gasket and add this to the clearance.
-Ideal clearance is .250″ to .500″ to ensure adequate oil supply.
Oil Pressure
Oil Pressure readings may be lower than expected due to anti-cavitations
modifications at lower rpm. The maximum oil pressure created by the oil pump
will be dependent on the relief spring installed.
At what RPM the bypass opens is dependent on the overall machined clearance of
the engines internal parts. The following list is based on the current spring
color and pumps style. The opening pressure is known as long as enough oil
volume is present to create the advertised pressure:
Small Block Chevy Oil Pumps (Cast & Billet):
Heavy pressure spring Purple Color 60 to 70 p.s.i. (At operating
temperatures) Light pressure spring Brown Color 50 to 60 p.s.i. (At
operating temperatures)
Big Block Chevy Oil Pumps (Cast & Billet):
Heavy pressure spring Brown Color 70 to 80 p.s.i. (At operating
temperatures) Medium pressure spring Purple Color 60 to 70 p.s.i. (At
operating temperatures) Light pressure spring Blue Color 50 to 60 p.s.i.
(At operating temperatures)
Changing Pressure Relief Springs
Remove the backing pin or cap plug to remove the spring from the bypass hole.
Remove the bypass piston with a magnet and check for surface wear. The spring
will have a wider coiled end that will sit against the pin or cap plug. This
is by design. When reinstalling put the bypass piston in first, with the long
pointed end entering the hole first. The spring will locate in the opening in
the bypass piston. Make sure the wide coiled end is closest to the pin or cap
plug when reinstalling.
For Technical Assistance, call Moroso’s Tech Line
(203)-458-0542, 8:30am-5:00pm Eastern Time
MOROSO PERFORMANCE PRODUCTS, INC.
80 CARTER DRIVE
GUILFORD, CT 06437
www.moroso.com
References
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>