Subaru EJ257 Inlet Manifold Installation Manual

Subaru EJ257 Installation — Pdf file about repair manual at subaru. Okay, on this occasion we would like to share information about the repair manual on your vehicle. As for the improvement here is on how to install the Subaru EJ257 Inlet Manifold. for more details you can see it here.

Summary Instructions

Prepare the vacuum manifold #2 for installation by installing fittings #3, 4, 5, and 6. Use Teflon tape or pipe sealing paste to ensure a positive seal on all pipe threads. The number and use of the ports can be customized (extra 1/8 NPT plugs are supplied to block unused ports). Generally, the vacuum manifold should be setup up as pictured. The 90° 3/8” nipple is for the brake booster, the 1/8” nipple is for the fuel pressure regulator reference, and the two 45° 1/4” nipples are for the EVAP purge solenoid and boost control solenoid lines.

Inspect the inside of the plenum #1 to ensure it is clean of debris, dirt, or other foreign matter.

Install the vacuum manifold to the plenum, being sure to install the supplied o-ring #7. It may be helpful to secure the o-ring in a few spots with silicone grease to hold it in place during installation. The vacuum fittings should face the throttle body mounting flange for most installations. Apply a small amount of blue Loctite and secure the manifold with the four M6 screws #8. Torque screws to 75 in-lb (6.25 ft-lb).

The throttle body will need modification to work with the Cosworth intake plenum. As per the factory service manual, remove the throttle body. Cover the exposed inlet manifold to prevent debris from entering.

Remove the MAP sensor located on the top of the throttle body. Prepare the throttle body by removing the upper coolant bypass nipple located just below the MAP sensor. The easiest way to do this is by tack-welding a screw to the nipple and removing it with a slide hammer. The nipple may also be removed with a pair of vise grips, but use caution to avoid damaging the hole in the throttle body casting.

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