Page 247 - REPOWER REFERENCE GUIDE (2020)

8.1L/496 CID Engine

Description Nm lb‑in. lb‑ft
Exhaust manifold screw 35 – 26
9. To install the exhaust elbow without a riser:
a. For exhaust manifolds equipped with water rails and aluminum exhaust manifolds without water rails, apply adhesive
to the coarse threads of the exhaust elbow studs.

Tube Ref No. Description Where Used Part No.
7 Loctite 271 Threadlocker Coarse threads of exhaust elbow studs 92-809819
b. Install the exhaust elbow studs into exhaust manifold. Tighten the studs to the specified torque.

Description Nm lb‑in. lb‑ft
Exhaust elbow stud 20 177 –
c. For exhaust manifolds equipped with water rails, aluminum exhaust manifolds without water rails, and cast iron
exhaust manifolds, position the exhaust elbow gaskets and turbulator onto the exhaust manifold, as shown.
a a - Exhaust elbow gasket

b - Turbulator
b

a
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d. For exhaust manifolds equipped with water rails and aluminum exhaust manifolds without water rails, install the
exhaust elbow onto the exhaust manifold and secure using the exhaust elbow nuts. Tighten the nuts to the specified
torque.
Description Nm lb‑in. lb‑ft
Exhaust elbow nut 16 142 –
e. For cast iron exhaust manifolds, install the exhaust elbow onto the exhaust manifold and secure using cap screws.
Tighten the cap screws to the specified torque.

Description Nm lb‑in. lb‑ft
Exhaust elbow cap screw 16 142 –
10. To install the exhaust elbow with a 152 mm (6 in.) riser:
a. Apply adhesive to the coarse threads of the exhaust elbow and riser studs.

Tube Ref No. Description Where Used Part No.
7 Loctite 271 Threadlocker Coarse threads of exhaust elbow and riser studs 92-809819
b. Install the exhaust elbow and riser studs into the exhaust manifold. Tighten the studs to the specified torque.

Description Nm lb‑in. lb‑ft
Exhaust elbow and riser stud 20 177 –
c. Position the exhaust elbow gaskets and turbulator onto the exhaust manifold as shown.

a
a - Exhaust elbow gasket
b - Turbulator
b

a
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d. Position the 152 mm (6 in.) riser onto the exhaust manifold and elbow studs until seated onto the exhaust manifold.
e. Position the exhaust riser to the exhaust elbow gasket onto the exhaust riser.
f. Install the exhaust elbow onto the exhaust riser and secure using the exhaust elbow nuts. Tighten the nuts to the
specified torque.

90-8M0149179 eng NOVEMBER 2018 © 2019 Mercury Marine Page 7F-5