20970720 Cylinder Head Gasket | Genuine Volvo Penta Part

🔧 Product Description

OEM sealing component used in the tad550/tad551 graded multi-layer-steel cylinder-head sealing system. It restores the intended fluid-, air- or gas-tight interface when the adjoining parts are serviced. Application note: Two-dot grade, documented nominal thickness approximately 1.53 mm. Select only after measuring piston protrusion.

🚤 Compatibility

Typically suits:

• Volvo Penta TAD550GE
• Volvo Penta TAD551GE

• Engine Family: TAD
• HP Range: Approximately 220 HP
• Year Range: Approximately 2000s-2010s

⚙️ Key Features

• 1.53 mm thick
• Marked with two dots
• Supersedes 20970717
• 0.649 kg
• Two TAD-series applications
• TH=1.53mm (Volvo assembly listing)

🔌 Function

Seals the cylinder head to the block, containing combustion pressure in each bore and keeping the coolant and oil galleries separate across the joint.

⚠️ Common Signs of Failure

• Coolant loss, overheating or repeated pressurisation
• Low compression, hard starting or cylinder misfire
• External leakage at the cylinder-head joint

🛠️ Service Notes

• Two dots is the thinner of this pair - 20970725 is the three-dot grade at 1.63 mm
• Measure piston protrusion and select the grade from that measurement rather than matching the gasket that came out
• Supersedes 20970717 - order under the current number

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 20970720 → Supersedes 20970717

OEM / Related Numbers

• 20970717 earlier number superseded by this part
• 20970527 cylinder head

Other-Brand OEM Numbers

• Elring: 154.410
• Victor Reinz: 61-43165-00
• Glaser: H40678-00

Aftermarket / Verified Equivalents

• Olsson Parts: 48147 - approximately 1.5 mm two-hole gasket
• MEC-Diesel: MEC871505

📦 Condition

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