21155339 Sleeve | Genuine Volvo Penta Part

🔧 Product Description

Genuine Volvo Penta sleeve used at two positions in the D16C-A MG and D16C-A MG RC cooling-system pipe arrangement. It locates and seals the adjoining connection while maintaining the correct spacing and support through thermal expansion.

🚤 Compatibility

Typically suits:

• Volvo Penta D16C-A MG

• Engine Family: D
• HP Range: Approximately 603-670 HP

⚙️ Key Features

• Genuine Volvo Penta D16C-A cooling-system sleeve
• Two sleeves used in the applicable cooling arrangement
• Confirmed for D16C-A MG and D16C-A MG RC
• Supports correct alignment of the coolant pipe connection
• Inspect seals, hose clamps and adjoining pipe surfaces during replacement
• Engine type: Volvo Penta 16.1-litre inline-six marine generating-set diesel
• 2 used per assembly

🔌 Function

Locates, spaces and supports the coolant-pipe connection while allowing the adjoining seals and clamps to maintain a leak-free joint.

⚠️ Common Signs of Failure

• Coolant leakage or dried coolant staining
• Cracking, corrosion, swelling or distortion
• Restricted coolant flow or trapped air
• Engine temperature running above or below specification
• Repeated seal, hose or clamp failure caused by poor alignment

🛠️ Service Notes

• Check which way round the sleeve goes before the old one comes out — sleeves are rarely symmetrical, and one end is usually chamfered or stepped to lead into the bore
• Clean and inspect the bore it seats in; a sleeve takes its final shape and fit from that bore, so corrosion, scoring or an oval bore will spoil a new part
• Draw or press the sleeve in square with the correct tool rather than driving it in — a sleeve started crooked will nip, and the material displaced by a hammer blow never fully recovers
• Renew any O-ring, seal or gasket that seats against the sleeve while it is out, and lubricate on assembly as the manual for your engine specifies
• Confirm the sleeve is fully home to the depth or flush condition the workshop manual gives before reassembling anything on top of it

🔄 Supersession & Cross Reference

OEM / Related Numbers

• 3593608 - associated coolant pipe
• 984744 - mounting screws
• 984735 - mounting screws
• 981749 - plug
• 949918 - shut-off cock
• 3594793 - hose connection
• 990940 - flange nut
• 21331354 - overflow valve
• 479974 - nipple
• 961670 - hose clamps
• 994561 - hose clamps
• 961669 - hose clamps
• 3593666 - cooling hoses
• 3594018 - cooling hoses
• 966458 - reduction nipple

📦 Condition

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