Cylinder Head Gasket 8-94393-346-1 Engine Head Gasket For Isuzu 6hh1

Cylinder Head Gasket 8-94393-346-1 Fits for IsuZu Engine 6hh1

1. Quick Notice

Confirm the OEM number 8-94393-346-1 on your original cylinder head gasket before ordering. This gasket fits Isuzu 6HH1 naturally aspirated engines (N/S types) installed in FRR, FSR, FTR, FSS, FTS, FVR trucks and various equipment [6†L2-L8]. Engine code 6HH1 must be verified on the engine block. Professional installation mandatory [7†L3-L4].

2. Description

The 8-94393-346-1 cylinder head gasket is a precision sealing component for Isuzu 6HH1 series diesel engines. This gasket seals the interface between the cylinder head and engine block, containing combustion pressure, coolant, and engine oil. Constructed from stainless steel with proprietary sealing coating technology [7†L4-L7]. Multiple cross-reference numbers include 8-94393-346-0, 8-94393-3461, 8943933461, 8-94393346-1, and 8-94393-346-2 [8†L6-L7]. The 6HH1 is an inline 6-cylinder diesel engine with 115mm bore × 132mm stroke, 8,226 cc (8.2L) displacement, and compression ratio of 18.5:1 [10†L3-L5][14†L10-L11]. The naturally aspirated 6HH1 delivers 129–147 kW (173–195 hp) at 2,800–2,850 rpm and 461–490 Nm of torque at 1,700 rpm depending on N or S variant [9†L3-L4][10†L5-L6][13†L5-L6][14†L14-L17]. Common failure symptoms include persistent engine overheating, coolant loss without external leaks, white exhaust smoke, milky engine oil, and bubbles in the radiator overflow tank. Replacement restores factory sealing integrity and prevents cross-contamination of engine fluids.

3. Parameters Table

4. Custom Content

Torque Specification Caution: Refer to the specific Isuzu service manual for exact torque settings as they vary by application. Cylinder head bolts typically require approximately 130 Nm (96 lb-ft) in multiple progressive stages [12†L3-L5].

Torque Sequence and Stages: Tighten cylinder head bolts in the specified sequence (center outward, spiral pattern) using progressive stages. Final torque value and angle specifications may vary by model year.

MLS Construction: This gasket features Multi-Layer Steel (MLS) construction with embossed layers and elastomer coating for superior sealing performance across extreme temperature fluctuations. The stainless steel base material resists corrosion and thermal fatigue in heavy-duty diesel applications.

Coolant System Refill: After installation, refill the cooling system with the correct coolant mixture. Bleed air from the system following manufacturer procedure.

5. FAQ

Q1: Which Isuzu truck models use the 8-94393-346-1 cylinder head gasket?
A1: This gasket fits Isuzu FRR33, FSR33, FTR33, FSS33, FTS33, and FVR33 trucks from 1996 to 2003 equipped with the 6HH1 8.2L naturally aspirated diesel engine [6†L4-L8].

Q2: What is the difference between 6HH1-N and 6HH1-S engines?
A2: Both engines share identical bore, stroke, displacement, and compression ratio. The 6HH1-N produces 173 hp (129 kW) at 2,800 rpm; the 6HH1-S produces 195 hp (147 kW) at 2,850 rpm with higher torque output [14†L12-L17].

Q3: Is this gasket compatible with turbocharged 6HH1 engines?
A3: Check your original gasket. 8-94393-346-1 is primarily specified for naturally aspirated 6HH1-N and 6HH1-S variants [6†L2-L4]. Turbocharged applications may require a different gasket specification with different fire ring design.

Q4: What are common 6HH1 head gasket failure symptoms?
A4: Persistent engine overheating, coolant loss without external leaks, white sweet-smelling exhaust smoke, milky oil on the dipstick, and exhaust bubbles in the radiator overflow tank.

Q5: Is this cylinder head gasket an OE Isuzu part?
A5: The 8-94393-346-1 is an OEM part number reference. Verify with your supplier whether the product is genuine Isuzu or high-quality aftermarket. This gasket is manufactured to OE specifications for Isuzu 6HH1 engine applications [7†L4-L7].