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EVO: Oiling & Lubrication - Sub-03I

86-90 Oil Pump (26204-86) Individual Parts and Pics

Oil Pump Body and Cover

Oil Pump Body

Oil Pump Cover

Gearshaft

Gearshaft Retaining Ring

Gearshaft Pins

Separator Plates

The 77-90 oil pumps used two plates to separate the feed and scavenge gerotors.
Both plates sit between the feed and return gears.
The plates are separated by a spring washer that puts tension against each plate in opposite directions.
Thus sealing off the feed and scavenge sections.

Separator plate locations 1)

Inner Plate

The inner plate part number (26463-77) was used in all 77-90 oil pumps.
It is the top plate (with the pump installed).
The return gerotors sit on this plate.

Inner plate (26463-77). Hole for the gearshaft is off center. Machined step is to locate the spring washer between the two plates. 2)

Outer Plate

The outer plate is the bottom plate (with the pump installed).
The feed gerotors sit under this plate.

  • (26493-75A) was an upgrade for the E83 pump assembly.
    It also was used in the re-designed L83-85 assemblies as well as all 86-90 oil pumps.

Notice the difference of the cut out or recessed area of the inside diameter of the outer plates.
This is for the different style of seals. 3)
Either plate will fit 77-90 oil pumps with their respective seals.

Outer plate comparison 4)
83-90 oil pump outer separator plate top view 5) 83-90 oil pump outer separator plate bottom view 6) Side view 7)

Outer Separator Plate Seal

Outer plate seal (12036A) was used on 83-90 models. It is supposed to prevent oil from rising into the scavenge gears / engine from the feed section of the pump.

  • Sold for use with outer separator plate (26493-75A)
  • It has a metal outside band with bonded rubber inside.
  • It is pressed into the outer plate hole.
Outer plate seal (12036A) (destroyed during removal) 8)
Outer seal (12036A) installed position. 9)

Spring Washer

The spring washer part number (26461-77) was used on all 77-90 oil pumps.
It sits between the two separator plates and induces pressure against both plates and gerotor sets.
The spring washer is what creates the tension on the drive gear.

Spring washer (26461-77) 10)
Spring washer location between the plates 11) Spring washer fits inside and faces the inner plate. 12)


1) , 5) , 6) , 7) , 9) , 11) , 12)
photo by Hippysmack
2) , 8) , 10)
photos by Hippysmack
4)
photo by DirtyCory of the XLFORUM, annotated by Hippysmack http://xlforum.net/forums/showthread.php?t=2071153
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