Page 238 - REPOWER REFERENCE GUIDE (2020)

Single Catalyst V8 Engines
! CAUTION

To avoid the possibility of injury or component damage, use caution when lifting heavy objects. Use an appropriate lifting
device or seek assistance.

IMPORTANT: The exhaust manifold and elbow, with catalyst, weigh in excess of 45 kg (100 lb) (82 kg [180 lb], for the 8.2).
The use of a hoist is highly recommended. If a hoist is not available, two people should be employed for manifold
installation. It may be necessary to remove the elbow and the catalyst to reduce the weight of the assembly to an amount
that is safe to lift without the use of a hoist.
3. Route a suitable lifting strap through the exhaust manifold as shown. Attach the strap to a suitable hoist and move the
manifold into position.

50906
Lifting strap routed between exhaust manifold's vertical supports

4. Attach the exhaust manifold to the cylinder head using the six (eight, for the 8.2) manifold mounting screws.
NOTE: Remove the alignment pins only after at least two manifold mounting screws are in place.
5. Small block engines: Tighten the manifold mounting screws to the specified torque.

Description Nm lb‑in. lb‑ft
Manifold mounting screws 41 – 30
6. 8.2 engines: Tighten the manifold mounting screws in three steps, following the torque sequence for each step, and finish
with a slow pull to the final torque.

8 3 7 1
2

6 4 5
54425
Torque sequence

Page 7E-22 © 2019 Mercury Marine 90-8M0149179 eng NOVEMBER 2018