Ecer asks for your consent to use your personal data to:
Personalised advertising and content, advertising and content measurement, audience research and services development
Store and/or access information on a device
Your personal data will be processed and information from your device (cookies, unique identifiers, and other device data) may be stored by, accessed by and shared with 135 TCF vendor(s) and 65 ad partner(s), or used specifically by this site or app.
Some vendors may process your personal data on the basis of legitimate interest, which you can object to by do not consent. Contact our platform customer service, you can also withdraw your consent.
Your message must
be between 20-3,000 characters!
Submit Requirement
Thank You！
Your requirement has been sent. we will contact you quickly!
{"title":"Crankshaft Damper Pulley Harmonic Balancer for ISUZU NPR66 4HF1 with Steel","imgUrl":"https:\/\/img.chinax.com\/nimg\/83\/f7\/05d35db58f42af4add6ab1ccac01-200x200-1\/crankshaft_damper_pulley_harmonic_balancer_for_isuzu_npr66_4hf1_with_steel.jpg","attrs":{"Rubber-Steel Hybrid Design":"30% vibration reduction compared to solid-metal pulleys","Payment Terms":"T\/T","Dimensions":"210\u00d7200\u00d790mm (21\u00d720\u00d79cm)","Model Number":"NPR66 4HF1"}}
{"title":"ISUZU C240 VALVE ROCKER ARM 9126113490","imgUrl":"https:\/\/img.chinax.com\/nimg\/fc\/e5\/2d0d41fb7f3d502843fd768e1e28-200x200-1\/isuzu_c240_valve_rocker_arm_9126113490.jpg","attrs":{"Model Number":"C240","Place of Origin":"Made in China","Minimum Order Quantity":"5 PCS","Supply Ability":"10000pcs\/month"}}
{"title":"ISUZU TFR68 69 ENGINE MOUNTING R 8970391890","imgUrl":"https:\/\/img.chinax.com\/nimg\/7b\/f1\/8998370f517b467e4c20c8df2ac9-200x200-1\/isuzu_tfr68_69_engine_mounting_r_8970391890.jpg","attrs":{"Model Number":"TFR68 69","Place of Origin":"Made in China","Minimum Order Quantity":"5 PCS","Supply Ability":"10000pcs\/month"}}
{"title":"ISUZU TFR68 69 RUBBER ENG FOO L 5876101930 8970860761","imgUrl":"https:\/\/img.chinax.com\/nimg\/68\/26\/7c7f4c50909a3695c90b2db58900-200x200-1\/isuzu_tfr68_69_rubber_eng_foo_l_5876101930_8970860761.jpg","attrs":{"Model Number":"TFR68 69","Place of Origin":"Made in China","Minimum Order Quantity":"5 PCS","Supply Ability":"10000pcs\/month"}}
{"title":"ISUZU DMAX 4JA1 T H1 GEAR TIMING 52 8979427551","imgUrl":"https:\/\/img.chinax.com\/nimg\/dc\/8f\/faca408a6e5c150d63ac2adb933f-200x200-1\/isuzu_dmax_4ja1_t_h1_gear_timing_52_8979427551.jpg","attrs":{"Model Number":"DMAX 4JA1 T H1","Place of Origin":"Made in China","Minimum Order Quantity":"5 PCS","Supply Ability":"10000pcs\/month"}}
{"title":"ISUZU NHR 4JA1 DMAX CRANKSHAFT 8944552401","imgUrl":"https:\/\/img.chinax.com\/nimg\/e2\/3f\/ae38ad12211136e0e8ec331c8536-200x200-1\/isuzu_nhr_4ja1_dmax_crankshaft_8944552401.jpg","attrs":{"Brand Name":"YIMI","Supply Ability":"10000pcs\/month","Delivery Time":"15-20 days after deposit","Packaging Details":"1, neutral box , 2, color box, 3, customer brand package"}}
{"title":"ISUZU NKR KY 4JB1 CRANKSHAFT 8944436620 1005011BBA1","imgUrl":"https:\/\/img.chinax.com\/nimg\/ef\/20\/c9299ee3da59c593a2e0493b8470-200x200-1\/isuzu_nkr_ky_4jb1_crankshaft_8944436620_1005011bba1.jpg","attrs":{"Brand Name":"YIMI","Supply Ability":"10000pcs\/month","Delivery Time":"15-20 days after deposit","Packaging Details":"1, neutral box , 2, color box, 3, customer brand package"}}
The Crankshaft Damper Pulley (Harmonic Balancer) with OEM numbers 8972220311 / 8-97222031-1 and 8970884774 / 8-97088477-4 is a verified direct-fit replacement for ISUZU NPR66 series trucks equipped with 4H series engines (including 4HF1, 4HG1/T). This damper pulley is a critical engine component mounted at the front of the crankshaft, performing two core functions: torsional vibration damping and engine accessory drive.
How It Works
The crankshaft damper pulley (harmonic balancer) consists of two core elements: a mass (metal inner core) and an energy-dissipating element (rubber outer ring). As the engine runs, the crankshaft generates torsional vibrations. The rubber outer ring absorbs and dissipates vibration energy through its damping properties, significantly reducing torsional stress on the crankshaft. Simultaneously, the pulley grooves drive engine front-end accessories — alternator, water pump, air conditioning compressor, etc. — ensuring normal operation of each accessory system.
Failure Symptoms
Replace immediately if any of these symptoms occur:
Excessive Engine Vibration — Noticeably increased engine vibration at idle or acceleration (rubber aging, loss of damping effect)
Belt Squealing — High-pitched squealing noise during engine operation (pulley surface wear or rubber cracking)
Rubber Cracking/Bulging — Visual inspection reveals cracks, bulges, or separation of the rubber outer ring
Middle East, Asia, Africa, South America, North America & Europe
Package:
Neutral Packing Or Make It As Requested
Material:
High-strength aluminum alloy & precision bearings
Cooling Type:
Engine coolant circulation
Installation:
Direct OEM replacement
Quality Standard:
OEM equivalent / ISO quality control
Vehicle & Engine Compatibility
Primary Applications
Brand
Model
Engine
Notes
ISUZU
NPR66
4HF1 / 4HG1 / 4HG1T
Primary fitment
ISUZU
NPR
4HF1 / 4HG1 / 4HG1T
ISUZU
NQR
4HF1 / 4HG1 / 4HG1T
ISUZU
NKR
4HF1 / 4HG1 / 4HG1T
Detailed Engine Compatibility
Engine Model
Displacement
Description
4HF1
4.3L
4-cylinder diesel engine
4HG1
4.3L
4-cylinder diesel engine
4HG1T
4.3L
4-cylinder turbo diesel engine
Important Notes:
The crankshaft damper pulley is a critical component of the engine's torsional vibration control system — failure can lead to premature crankshaft wear or fracture
Timing mark alignment is critical during installation to ensure correct engine timing
Recommended to replace the drive belt simultaneously when replacing the pulley
For 100% accurate fitment, please provide VIN (Chassis Number) or engine model
Features & Benefits
Rubber-Steel Hybrid Construction
Effectively attenuates crankshaft torsional vibration, protecting internal engine components — 30% vibration reduction compared to solid-metal pulleys
Precision-Machined Mounting Holes
Ensures accurate installation and timing mark alignment — pre-drilled mounting holes and alignment notches simplify installation, reduce assembly errors
High-Temperature Rubber Outer Ring
Maintains stable damping performance under extreme temperatures — operating range -40°C to +120°C, suitable for all climate conditions
4.866kg Standard Weight
Exact match to ISUZU OEM inertia specifications — ensures proper crankshaft dynamic balance, prevents additional vibration
Direct OE Fit Replacement
No modification needed for quick installation — 98.7% direct fitment rate confirmed across 84 repair orders
12-Month Warranty
Peace of mind on manufacturing defects — free replacement within warranty period
Quality Control & Verification
QC Item
Verification Method
Standard
Rubber Material Properties
Rubber hardness/tensile test
Meets OEM rubber compound specifications
Metal Core Hardness
Hardness tester
Meets alloy steel standard
Critical Dimensions
Precision gauge
210*200*90mm ± tolerance
Weight Verification
Precision scale
4.866kg ± tolerance
Dynamic Balance Test
Dynamic balancing machine
Meets OEM balance specifications
Rubber-Metal Bond Strength
Peel/shear test
Meets OEM bond strength specifications
Visual Inspection
100% visual inspection
No cracks, bubbles, or surface defects
Installation & Maintenance Recommendations
IMPORTANT: The crankshaft damper pulley is a critical engine safety component. Improper installation may cause timing misalignment, belt detachment, or even crankshaft damage. Installation should be performed by qualified professionals.
Yimi (Guangzhou) Automotive Parts Co., Ltd.
Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ... Yimi (Guangzhou) Automotive Parts Co., Ltd.
Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ...
