EXHAUST SYSTEM

Before proceeding, drain water and/or coolant ... scratches, or water and exhaust leaks may re- sult. 3. ... Using new gasket, install exhaust manifold to cyl-.
77KB taille 1 téléchargements 359 vues
EXHAUST SYSTEM

72990

MANIFOLD AND ELBOWS

Index

72991

7 B

Table of Contents Page Torque Specifications . . . . . . . . . . . . . . . . . . . . . 7B-1 Sealants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7B-1 Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7B-1 Cleaning and Inspection . . . . . . . . . . . . . . . . . . . 7B-2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7B-2

Index 7B-0 –MANIFOLD AND ELBOWS

90-823226--1 996

6. Remove exhaust manifold fasteners; remove manifold assembly and discard gaskets.

Torque Specifications Fastener Location Hose Clamps

Lb. Ft.

a

N•m

Securely

b

Exhaust Elbow 25

34

Exhaust Manifold

c d

f

Sealants

e

Description

Part Number

Quicksilver Perfect Seal

92-34227-1

g 72991

Cast Iron Elbow With Restrictor Gasket

Removal 1. Disconnect battery cables from battery.

! CAUTION Before proceeding, drain water and/or coolant from exhaust elbows and manifolds. Water or coolant MUST BE DRAINED from exhaust elbows and manifolds or some will run into engine combustion chambers when exhaust elbows are removed.

a b c d e f g

-

Exhaust Elbow Assembly - Starboard Side Shown Bolts (4) Fitting (45°) or Fitting (Straight) Gasket - Seawater Cooled (Align as Shown) Exhaust Manifold Assembly Plug Bolts (6)

a b

2. Drain water from manifold and exhaust elbow. (Refer to cooling system Section 6A or 6B, depending on model.)

c d

f

3. Disconnect exhaust bellows and cooling hoses. e

4. Starboard Manifold: a. Disconnect both shift cables. Retain hardware. g

b. Disconnect wires for shift cut-out switch.

72990

c. Remove shift plate assembly from exhaust elbow. 5. Remove exhaust elbow and risers, if so equipped.

Cast Iron Elbow With Separator Gasket a b c d e f g

-

Exhaust Elbow Assembly - Starboard Side Shown Bolts (4) Fitting (45°) or Fitting (Straight) Manifold Separator Gasket Exhaust Manifold Assembly Plug Bolts (6)

Index 90-823226--1 996

MANIFOLD AND ELBOWS - 7B-1

MCM 4.3LX / 4.3LXH / 262 MAGNUM SEAWATER COOLED WITH ONE PIECE CAST IRON MANIFOLD

Installation 1. Using new gasket, install exhaust manifold to cylinder head. Torque fasteners to 25 lb. ft. (34 N·m). IMPORTANT: See Section 7C for additional information if exhaust risers are used. 2. Using new gaskets, install exhaust elbows (and risers, if so equipped), to exhaust manifold. Torque fasteners to 25 lb. ft. (34 N·m). 3. Coat threads of drain plugs with Quicksilver Perfect Seal and install. Tighten securely.

74908

STARBOARD MANIFOLD: a. Install shift plate assembly on exhaust elbow using hardware retained.

Cleaning and Inspection

b. Connect wires for cut-out switch.

1. Clean gasket material from all surfaces and wash parts in solvent.

c. Refer to appropriate Stern Drive Service Manual and properly install and adjust both remote control shift cables, using hardware retained.

2. Inspect all parts carefully. Machined surfaces must be clean and free of all marks and deep scratches, or water and exhaust leaks may result.

4. Install cooling hoses. Tighten hose clamps securely.

3. Check water passages for foreign material. Passages must be clean for efficient cooling.

5. Refer to SECTION 6B - “Closed Cooled Models” and refill closed cooling system, if so equipped.

4. If more thorough inspection is desired, pipe plugs may be removed from exhaust manifold and exhaust elbow.

6. Reconnect battery cables to battery. Tighten securely.

! CAUTION IMPORTANT: If plugs are removed, coat threads with Quicksilver Perfect Seal before reinstalling. 5. Check for cracks. 6. To test manifold body for leaks, block-off plates, plugs, or short hoses with plugged ends must be used. One block-off plate must have a threaded hole for attaching compressed air hose. Use new gaskets when installing block-off plate(s). Apply 40 PSI (276 kPa) of air pressure and submerge manifold in water. Air bubbles will indicate a leak.

Do not operate engine without cooling water being supplied to the seawater pickup pump, or pump impeller will be damaged. 7. Place boat in water and/or properly supply cooling water to seawater pickup pump.

Index 7B-2 –MANIFOLD AND ELBOWS

90-823226--1 996

8. Start engine and check for fuel, exhaust and water leaks.

a

a

b b c c

d

f

d

f

e e g 72990

g 72991

Cast Iron Elbow With Restrictor Gasket a b c d e f g

-

Exhaust Elbow Assembly - Starboard Side Shown Bolts (4) Fitting (45°) or Fitting (Straight) Gasket - Seawater Cooled (Align as Shown) Exhaust Manifold Assembly Plug Bolts (6)

Cast Iron Elbow With Separator Gasket a b c d e f g

-

Exhaust Elbow Assembly - Starboard Side Shown Bolts (4) Fitting (45°) or Fitting (Straight) Manifold Separator Gasket Exhaust Manifold Assembly Plug Bolts (6)

Index 90-823226--1 996

MANIFOLD AND ELBOWS - 7B-3

THIS PAGE IS INTENTIONALLY BLANK TO ALLOW FOR CORRECTIONS OR ADDITIONS AT A LATER DATE

Index 7B-4 –MANIFOLD AND ELBOWS

90-823226--1 996