J-2 With Callouts

This page serves as a repository for photos and diagrams of the J-2 rocket engine with callouts identifying major (and even not-so-major) components.

Click image for a 5779x4086 pixel version of this image in a new window.
Adapted from p. 1 of a Rocketdyne "J-2 Engine Facts" handout. Located in the Mauldin Collection, Dept. of Archives/Special Collections, M. Louis Salmon Library, University of Alabama in Huntsville.
Scan, clean-up, and adaptation by heroicrelics.

The engine components identified on the left-hand graphic include

Fuel Inlet Duct
Gimbal
Start Tank
Fuel Turbopump
Oxidizer Turbine By-Pass Valve

Oxidizer Inlet Duct
Oxidizer Turbopump
Turbine Exhaust Duct
Heat Exchanger
Exhaust Manifold
Fuel Manifold

The engine components identified on the right-hand graphic include

High Pressure Oxidizer Duct
Propellant Utilization Valve
Primary Flight Instrumentation

Main Oxidizer Valve
LOX B/V [Bleed Valve; used to help condition the engine prior to start by bleeding trapped gas from the oxidizer systems]
Fuel B/V [Bleed Valve; similar to the LOX B/V]
Gas Generator
Elec. Control Package
Oxidizer Turbine By-Pass Valve
Main Fuel Valve
Thrust Chamber

This diagram includes not only call-outs but also dimensional information:

Click image for a 6136x4924 pixel version of this image in a new window.
From p. 1 of a Rocketdyne "J-2/J-2S Engines" handout. Located in the Morea Saturn and J-2 binder, Dept. of Archives/Special Collections, M. Louis Salmon Library, University of Alabama in Huntsville.
Scan and clean-up by heroicrelics.

The engine callouts on the left-hand graphic include

Oxidizer Inlet, 8.0 I.D.
Oxidizer Pump
Gimbal Center
21.0 from Center of Oxidizer Inlet to Gimbal Center
80" Overall Diameter

No. 2 Actuator Attach Point
8.4 from Gimbal Center to No. 2 Actuator Point
Fuel Inlet, 8.0 I.D.
8.4 from No. 2 Actuator Point to Center of Fuel Inlet
Fuel Turbopump
8.4 from Center of Fuel Inlet to No. 1 Actuator Point
No. 1 Actuator Point
21.0 from Gimbal Center to Center of Fuel Inlet

The callouts on the right-hand graphic include

Mounting Surface [presumably Gimbal forward face]
8.5 from Oxidizer Inlet forward face to Gimbal forward face
13.5 from Fuel Inlet forward face to Gimbal forward face

Gimbal Center
Plane of Actuator Attach Points
116" from Gimbal Center to Thrust Chamber Exit Plane
133" from Fuel Inlet forward face to Thrust Chamber Exit Plane