Cylinder Head Gasket 5-11141069-1 5111410691 For ISUZU C240 C190 Diesel Engines — 87.5mm Bore, 1.2mm Metal Composite, Forklift Generator Industrial

The Cylinder Head Gasket with OEM references 5-11141069-1 / 5111410691 is a verified sealing component for ISUZU C240 (2.4L) and C190 (1.9L) diesel engines, widely used in forklifts (TCM and other brands), stationary generators, agricultural machinery, and small construction equipment. This gasket is the critical sealing element between the cylinder head and the engine block, responsible for containing combustion pressure, coolant, and oil under the cyclic thermal and mechanical loads of industrial diesel operation.

The part is confirmed as a genuine ISUZU service part ("GASKET CYL HD") by authorized parts catalogues, and is simultaneously available through multiple aftermarket brands including Ajusa, GLASER, PAYEN, GOETZE, ELWIS ROYAL, FAI AutoParts, and BGA. The Ajusa 10044100 reference specifies 87.5 mm bore diameter, 1.2 mm thickness, and 247 g weight, with a construction described as metal and soft material (metal composite / fibre composite) — a configuration that provides both combustion sealing integrity and conformability to minor surface irregularities.

• OEM Genuine Status Verified: Confirmed as "GASKET CYL HD" in ISUZU's authorized parts system, with a reference price of €43.89 and the statement that it is "exactly the same as the one mounted at the factory."
• Bore Diameter Verified: 87.5 mm — confirmed by Ajusa 10044100 ("Diameter [mm]: 87,5") and multiple Spanish/Portuguese aftermarket listings.
• Thickness Reference: 1.2 mm per Ajusa 10044100; 1.3 mm per alternative catalogue data for the C24SE / C190-C240 family. Confirm which thickness applies to the specific engine variant.
• Weight Verified: 247 g (Ajusa) / 0.24 kg (okisuzu) — consistent across independent sources.
• Material Verified: Metal and soft material (metal composite / fibre composite) — confirmed by Ajusa 10044100 and PAYEN BJ650 ("Fibre Composite") descriptions.
• Engine & Application Coverage Verified: ISUZU C240 (2.4L) / C190 (1.9L) diesel engines, applied in forklifts (TCM), generators, agricultural machinery, and small construction equipment — confirmed by ISUZU parts catalogues and industrial parts suppliers.
• Cross-Reference Density Verified: Ajusa 10044100, GLASER 50542, PAYEN BJ650, GOETZE 30-028333-00, ELWIS ROYAL 0030025, FAI AutoParts HG331, BGA CH2332, 61-52400-00 — all confirmed as aftermarket equivalents to OE 5-11141069-1 / 5111410691.
• HS Code Verified: 848410000 — confirmed by ISUZU parts supplier listing for this gasket.

• Coolant leak at the head-to-block joint: Visible coolant seepage or crusty residue (white/pink crust) along the cylinder head mating surface — the most direct sign of head gasket failure.
• Overheating or temperature instability: A compromised head gasket allows combustion gases to enter the cooling system (or coolant to enter the combustion chamber), disrupting heat transfer and causing temperature spikes.
• White exhaust smoke (coolant burning): Persistent white smoke from the exhaust that does not dissipate — indicates coolant entering the combustion chamber through a failed gasket.
• Bubbles in the radiator / coolant reservoir: Combustion gases escaping past the head gasket pressurize the cooling system, producing bubbles or coolant overflow.
• Loss of compression / misfire / rough running: A blown head gasket between adjacent cylinders or between a cylinder and a coolant/oil passage causes compression loss and unstable combustion.
• Milky or contaminated engine oil: Coolant mixing with engine oil produces a milky emulsion on the dipstick or under the oil filler cap.
• External oil or coolant leak at the head joint: Visible wetness running down the side of the block from the head mating surface.

• Thickness must be confirmed first: The C190/C240 head gasket exists in 1.2 mm and 1.3 mm references, and potentially other variants. Measure the removed gasket's thickness or provide the engine serial number for supplier matching. Installing an incorrect thickness changes compression ratio and sealing geometry.
• -0 vs. -1 suffix: 5-11141069-0 and 5-11141069-1 are treated as functionally interchangeable in most aftermarket catalogues, but read the original unit's marking where possible. The -0 suffix appears in listings for C190/C240 applications, while the -1 is the reference confirmed by Ajusa and ISUZU genuine parts.
• Material variations exist: Some listings describe the gasket as metal composite / fibre composite, while others reference multi-layer steel composite. For standard industrial replacement, the metal-composite configuration is the mainstream reference; confirm if a specific material is required for high-load or turbocharged variants.
• Genuine vs. aftermarket: This gasket is available as ISUZU Genuine (reference price ~€43.89) and as aftermarket equivalents from Ajusa, GLASER, PAYEN, GOETZE, and others. Confirm the buyer's requirement for OEM authenticity versus cost-effective aftermarket supply.

1. Confirm the original gasket variant first: Measure the removed gasket's thickness (1.2 mm or 1.3 mm), bore diameter (87.5 mm), and suffix marking. Match the replacement to these specifications, not just the OEM number.
2. Inspect the cylinder head and block surfaces: Check for warping, pitting, or erosion at the head mating surface. A warped or damaged head must be resurfaced or replaced — a new gasket will not seal against a compromised surface.
3. Clean the mating surfaces thoroughly: Remove all old gasket residue, carbon deposits, and oil film from both the head and block faces. Do not gouge or scratch the machined surfaces.
4. Position the gasket dry: The 5-11141069-1 gasket is supplied without sealant in standard configuration. Do not apply liquid gasket unless the workshop manual specifically requires it on certain passages.
5. Install the cylinder head: Carefully lower the head onto the block, ensuring the gasket remains centered and all coolant/oil passages align. Do not slide the head — sliding can shift the gasket or damage the fire ring.
6. Torque the head bolts in sequence: Follow the workshop manual's torque sequence and specification precisely. Cylinder head bolts may be torque-to-yield (TTY) and may require replacement.
7. Refill and bleed the cooling system: Refill with the correct coolant mixture and bleed air from the system. Air pockets can cause localized overheating and repeat gasket failure.
8. Re-torque (if specified): Some industrial applications require a re-torque after the first heat cycle. Follow the workshop manual instruction.
9. Monitor coolant level and temperature: During the first hours of operation, monitor coolant level and engine temperature closely.

• Monitor coolant condition at every service — degraded coolant accelerates gasket corrosion at the coolant passages.
• Check for external leaks at the head joint during routine inspection — early detection of seepage prevents sudden failure.
• Avoid overheating: The C240/C190 head gasket is sensitive to thermal stress; maintain the cooling system (thermostat, radiator, water pump) in good condition.
• Use the correct coolant specification: Refer to the equipment or engine manual for the recommended coolant type and change interval.

• Standard packing: Neutral carton with protective flat packaging to prevent creasing; bulk export pallet available.
• Package contents: 1 × Cylinder Head Gasket. Head bolts, sealant, and other engine gaskets are not included.
• Set options: Single head gasket / full gasket set (5-87810-208-2 for C190/C240) — specify at inquiry.
• Suitable for: ISUZU C240/C190 industrial engine rebuilders, TCM forklift service providers, generator maintenance departments, agricultural machinery repair shops, spare parts distributors, and export wholesalers serving Southeast Asia, the Middle East, Africa, and Latin America.
• Related parts available: Full gasket set (5-87810-208-2), valve cover gasket, oil pan gasket, intake/exhaust manifold gaskets, and complete C240/C190 engine overhaul kits.