OEM Me071955 Mitsubishi Cylinder Head Gasket Fit For 6D17 6D17t

Me071955 Fit for Mitsubishi 6D17 6D17t Cylinder Head Gasket

Confirm your engine code (6D17 or 6D17T) and original head gasket thickness before ordering ME071955. This gasket seals between the cylinder head and engine block. Verify bore diameter and number of layers. Professional installation with proper torque sequence required. Replace head bolts simultaneously.

The ME071955 cylinder head gasket is a precision sealing component for Mitsubishi 6D17 naturally aspirated and 6D17T turbocharged diesel engines. Constructed from multiple layers of spring steel with elastomer bead coatings around each cylinder bore. The gasket design includes stainless steel fire rings that withstand combustion chamber pressure and temperature. Coolant and oil passages are reinforced with viton rubber sealing beads. This gasket accommodates the specific bore diameter and deck height of the 6D17 engine family. Common failure modes include combustion leakage between cylinders, external coolant seepage at the head joint, and compression loss from blown fire rings. Replacing the gasket restores cylinder sealing, prevents overheating, and eliminates exhaust gas entry into the cooling system.

Surface Preparation: Both the cylinder head and engine block surfaces must be clean and flat. Remove all old gasket material using a plastic scraper or non-metallic wheel. Do not use sandpaper or abrasive discs on the sealing surface. Maximum allowable surface roughness is 1.5 micron Ra. Maximum allowable distortion is 0.05mm measured diagonally across the head or block.

Head Bolt Replacement: Install new head bolts with each gasket replacement. Original bolts stretch during torque application. Measure bolt length before reuse. Any bolt exceeding maximum specified length must be discarded. Lubricate bolt threads and under-head washers with light engine oil before installation.

Torque Sequence and Stages: Tighten head bolts in the correct sequence (center outward, spiral pattern). Stage 1: 30 Nm. Stage 2: 70 Nm. Stage 3: 120 Nm. Stage 4: Angle torque of 90 to 120 degrees as specified for your engine. Mark each bolt after final angle to verify rotation. Wait 20 minutes before final torque check.

Retorque Procedure: Retorquing is not required for MLS gaskets when properly installed with new bolts. If retorquing is specified for your engine model, perform the check only after a full heat cycle and complete cooldown. Loosen each bolt one-eighth turn before retightening to the final specification.

Q1: Does ME071955 fit both naturally aspirated 6D17 and turbocharged 6D17T?
A1: Yes. The same gasket specification covers both naturally aspirated and turbocharged variants of the 6D17 engine. No gasket difference exists between these two versions.

Q2: How do I determine the correct gasket thickness for my engine?
A2: Measure the original gasket thickness at a undamaged corner using a micrometer. Alternatively, consult the service manual for your specific engine serial number. Piston protrusion above the block deck determines required gasket thickness.

Q3: What happens if I reuse old head bolts?
A3: Old bolts have permanent stretch from previous torque cycles. Reused bolts fail to achieve correct clamp load. The gasket may leak or blow out under high cylinder pressure. Always install new bolts.

Q4: Can I use sealant on this MLS gasket?
A4: No. Multi-layer steel gaskets are designed to seal without additional sealant. Applying sealant blocks the elastomer beads and prevents proper compression. Install the gasket dry on clean surfaces only.

Q5: What symptoms indicate a blown head gasket on a 6D17 engine?
A5: White smoke from exhaust that smells of coolant, bubbling in the radiator overflow tank, oil appearing milky, coolant loss with no external leak, or compression bubbling into the cooling system. Exhaust gases in coolant cause rapid overheating.

Q6: Is the fire ring visible on this gasket?
A6: Yes. Each cylinder opening has a distinct stainless steel fire ring that appears brighter than the surrounding gasket layers. The fire ring compresses to form the combustion seal. Do not damage this ring during installation.

Q7: Can this gasket be used on an engine that has been decked or shaved?
A7: Yes, within limits. The MLS gasket accommodates minor surface variations. However, excessive material removal from the head or block changes piston protrusion. Measure carefully before selecting gasket thickness. A thicker gasket may be required.

Q8: How do I store the gasket before installation?
A8: Keep the gasket in its original sealed packaging until ready for use. Do not bend or crease the gasket. Store flat at room temperature away from humidity and chemicals. Handle only with clean, dry hands.

Q9: What torque angle is required for 6D17 head bolts?
A9: Consult the service manual for your specific engine year. Typical specification for 6D17 is 90 to 120 degrees after reaching 120 Nm. Different bolt grades and lubricants change the required angle. Never guess the angle specification.

Q10: Why does my new gasket leak coolant externally after installation?
A10: Possible causes include damaged sealing bead from improper handling, dirty sealing surface, incorrect torque sequence, reused bolts, or head/block warpage exceeding 0.10mm. Disassemble and inspect all components. The head may require resurfacing.