21356421 Exhaust Manifold | Genuine Volvo Penta Part

🔧 Product Description

Genuine standard-height starboard-hand exhaust manifold for selected Volvo Penta GM-based 5.0-litre and 5.7-litre catalyst-equipped V8 petrol marine engines. The water-jacketed manifold carries exhaust gas to the catalyst elbow while cooling the casting to marine operating temperature.

🚤 Compatibility

• Engine Family: V
• HP Range: 225-320 HP

Full model list at the end of this description.

⚙️ Key Features

• Standard-height starboard-hand manifold
• Catalyst-equipped V8 petrol-engine application
• Water-jacketed marine exhaust construction
• Integrated oxygen-sensor and catalyst-system compatibility
• Zinc anode 21403633 available for corrosion protection

🔌 Function

The manifold collects exhaust gas from the cylinder head, transfers it to the catalyst elbow and circulates cooling water around the exhaust passages.

⚠️ Common Signs of Failure

• External water or exhaust leakage
• Rust or corrosion around the water jacket
• Water entering an exhaust port
• Soot at the cylinder-head or elbow joint
• Oxygen-sensor or catalyst efficiency faults
• Engine damage caused by internal manifold leakage

🛠️ Service Notes

• Treat the manifold as a wear item on a raw-water-cooled engine: check the water jacket and gas passages for corrosion, scale and cracks whenever it is off, and replace rather than clean up a casting that is heavily wasted
• Check the mating faces against a straightedge, renew all gaskets, and renew any studs, nuts or bolts that are corroded
• Blank off the open ports while the manifold is away so nothing can drop into a cylinder head
• Tighten the fixings in the sequence and to the figures given in the workshop manual for your engine, and re-check for gas and water leaks once the engine has been up to temperature
• Inspect the riser, elbow and exhaust hose at the same time; corrosion is rarely confined to one part of the system

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21356421 → Supersedes 21357390

OEM / Related Numbers

• 3848801 earlier number superseded by this part
• 21357390 earlier number superseded by this part
• 3883724 - Oxygen sensor; four used in the catalyst system
• 3889435 - Related support bracket
• 21571773 - Catalyst exhaust elbow
• 21519754 - Earlier related elbow reference
• 40005439 - Manifold-to-elbow gasket
• 21403633 - Zinc anode

Aftermarket / Verified Equivalents

• RECMAR: REC21403633 zinc anode fits this manifold family

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta 5.7GXiC-320-R, 5.7GXiCE-320-R, 5.7GXiC-J, 5.7GXiC-JF, 5.7GXiCE-JF, 5.7GXiCE-J, 5.7GXiCE-M, 5.7GXiC-P, 5.7GXiCE-P, 5.7GiCE-300-M, 5.7GiCE-300-MF, 5.7GiC-300-J, 5.7GiCE-300-J, 5.7GiCE-300-JF, 5.7GiC-300-JF, 5.7GiC-300-P, 5.7GiCE-300-P, 5.7GiC-300-R, 5.7GiCE-300-R, 5.0GiC-225-S, 5.0GiCE-225-S, 5.0GiC-J, 5.0GXiCE-JF, 5.0GXiCE-J, 5.0GXiC-JF, 5.0GXiCE-M, 5.0GXiCE-MF, 5.0GXiC-P, 5.0GXiCE-P, 5.0GXiC-270-R, 5.0GXiCE-270-R, 5.0GXiC-J
• Volvo Penta V8-270-C-B, V8-270-CE-B, V8-300-C-A, V8-300-CE-A, V8-300-C-B, V8-320-C-B, V8-320-CE-B, V8-300-CE-B, V8-320-C-A, V8-320-CE-A, V8-225-C-A, V8-225-CE-A, V8-225-C-B, V8-225-CE-B, V8-270-C-A, V8-270-CE-A