• All these use 16t gear sets and style 1 plumbing ¹⁾
• The production changes made during its run: ²⁾
  • 57-e58 baseline pump that all others came from. no oil seal. uses a snap ring and a full profile woodruff key at scavenge gear.
  • L58-59 same as above but now has body machined for a oil seal.
  • 60-e62 same as L58-59 but the retaining ring at the scavenge is replaced by half moon retainers. The scavenge drive gear is counter-bored for these half moons and the woodruff key is shortened so it won't interfere with the half moons.

• All these used 14t gears & scavenge sets got taller than the previous 16's were. ³⁾
  • All use half moons and shortened key on scavenge drive.
  • Bodies made till '66 are for style 1 plumbing.
  • In '67, the body gets tapped for the external feed fitting for use on 67-69 XLH. This is when style2 plumbing started.
  • Bodies tapped for style2 were still used on the last 3 yrs (67-69 xlch) of style1 cases.
  • A plug is put in this new hole if body got used on a style1 case set.

• These go back to 16t gears and a snap ring with long key ⁴⁾
• Feed gears are the same as 57-e62 but the scavenge set is now wider again (wider than any of the previous sets).
• Breather gear gets enlarged slots in it. ⁵⁾
• Breather timing:
  • Open 20-25 deg ATDC Front CYL ⁶⁾
  • Close 85-90 deg ABDC Front CYL ⁷⁾
• Body and breather housing get an extra hole (2 holes now) drilled in them for additional return capacity, cases also get extra matching hole. ⁸⁾
• Solid feed gear drive pin gets replaced by the hated roll pin. ⁹⁾
• Dowels between body and breather housing are now history. ¹⁰⁾

• Each complete pump breaks down into these components: ¹¹⁾

1. Breather or sleeve gear-has the 2 slots in it
2. Breather gear housing- cast iron part that breather rides in
3. Feed gear set and drive pin (the skinnier of the 2 gear sets)
4. Pump body
5. Scavenge gear set and drive key and retaining clip.

There were 3 springs used from 52-76. ¹²⁾
(52-56 also used a second valve- pressure relief).

1. 52-E57: (26363-36)
2. L57-E72: (26364-57)
   • Wire length: 1-15/64“ ¹³⁾
   • Wire O.D.: ≈ 0.0250” ¹⁴⁾
3. L72-76 (26364-72)
   • Wire length: 1-7/16“ ¹⁵⁾
   • Wire O.D.: ≈ 0.0250” ¹⁶⁾

This is suppose to be a NOS 67 Pump Spring.
L = 1.215“ Wire Gauge = .024”

67 oil pump spring. 17)

52-E57 18)	(L) L57-E72 - (R) L72-76 19)	(Bottom) L57-E72 - (Top) L72-76 20)

(Missing are the -'56 breather gear and long full profile woodruff scavenge drive key and snap-ring). ²¹⁾

Breather Gears 22)	Some of amf's signature quality control. These are 3 - 72 breather gears.23)	A closer view24)

The 2 different breather housings25)	Feed Gear Sets26)	More often than not the solid pin was a slipfit in cross hole.27)

On to the bodies. The 2nd text is “26217-56a L58-e62”28)

The 4 different scavenge gear sets. Lined up from early in foreground to later in background. This is to show the height progression.29)	Top view of all 4 sets.30)	A closer view of the height changes.31)