21551974 Intermediate Housing | Genuine Volvo Penta Part

🔧 Product Description

A major cast housing used in the Volvo Penta IPS-A lower-gear assembly from drive serial number 3194012078 onward. It carries the intermediate bearings, seals and steering-related components between the upper and lower drive sections.

🚤 Compatibility

• Engine Family: D, IPS
• HP Range: 260-435 HP

Full model list at the end of this description.

⚙️ Key Features

• IPS-A lower-gear structural housing
• Applicable from drive serial number 3194012078 onward
• Precision-machined bearing and seal bores
• Supports vertical-shaft and steering components
• Corrosion-protected marine casting

🔌 Function

The housing maintains alignment between the IPS drive sections and provides the machined support surfaces for bearings, seals and steering components.

⚠️ Common Signs of Failure

• Impact cracks or structural distortion
• Corrosion around water passages and seal bores
• Bearing bores worn out of tolerance
• Drive-oil or water leakage
• Steering play caused by worn mounting locations

🛠️ Service Notes

• Clean both mating faces completely and check them for flatness, burrs, corrosion and old sealant; an intermediate housing seals two assemblies at once and both faces have to be right
• Check the bearing bores and any seal running surfaces in the housing for wear and scoring, and renew seals and bearings while the housing is off
• Fit new gaskets, seals and O-rings, and use sealant only where the manual calls for it and only as thinly as it specifies
• Locate the housing on its dowels so it sits square before the fasteners are pulled down, then tighten evenly in stages to the figures given in the workshop manual for your unit
• Check that shafts turn freely and that oil passages line up before final assembly, and check for leaks after the first period of running

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 21551974 → Supersedes 3808841

OEM / Related Numbers

• 3808841 earlier number superseded by this part
• 184093 - Needle roller bushing
• 184863 - Needle roller bearing
• 21535352 - Lip seal
• 955975 - O-ring
• 3861976 - Gasket
• 3861697 - Gear segment

📦 Condition

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

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D6-330D-E, D6-370D-E, D6-330D-C, D6-370D-C, D6-330D-D, D6-370D-D, D6-330D-F, D6-370D-F, D6-300D-F, D6-310D-D, D6-310D-C, D6-310D-E, D6-435D-D, D6-435D-E, D6-435D-F, D6-435D-C
• Volvo Penta D4-260D-C, D4-260D-D, D4-260D-E, D4-260D-F, D4-300D-C, D4-300D-D, D4-300D-E, D4-300D-F
• Volvo Penta IPS-A, IPS-B, IPS-C, IPS-D, IPS-E, IPS-F
• Volvo Penta 8.1IPSCE-MF, 8.1IPSCE-P, 8.1IPSCE-Q