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{"title":"ISUZU Valve Guide 8mm Inner Diameter 50mm Length Precision Honed bore for 4JB1","imgUrl":"https:\/\/img.chinax.com\/nimg\/7e\/ef\/1abd6c6fe91ae0bcb4e3f51b782b-200x200-1\/isuzu_valve_guide_8mm_inner_diameter_50mm_length_precision_honed_bore_for_4jb1.jpg","attrs":{"Payment Terms":"T\/T","Quantity per Cylinder":"2 per cylinder","Model Number":"NKR55 4JB1 4JA1","Outer Diameter":"14.03mm"}}
{"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"}}
ISUZU Valve Guide 5-11721016-0 5117210160 for NKR55 4JB1 4JA1 — 8×50mm OEM Standard
ISUZU Valve Guide 5-11721016-0 5117210160 Compatible with NKR55 4JB1 4JA1 Diesel Engine — 8*14*50mm OEM Standard Replacement
The ISUZU Valve Guide with OEM numbers 5-11721016-0 / 5117210160 is a precision-engineered replacement designed for ISUZU NKR55 series light-duty trucks, compatible with 4JB1 and 4JA1 diesel engines. This component is a core part of the engine's valve train — the Valve Guide (GUIDE; VLV) — pressed into the cylinder head to provide precise guidance and support for the valve stem, ensuring accurate reciproing motion of intake and exhaust valves.
Numbering Note: This product number is 5-11721016-0 / 5117210160, also listed as 5-11721-016-0. Cross-reference numbers include 1007101-44, 1003102FA, and 94029347. Brands include MAMUR. Please verify the specific number based on actual vehicle configuration.
Working Principle
The valve guide is a precision tubular component press-fitted into the cylinder head, with the valve stem reciproing within its bore. Its core functions include:
Precise Guidance: Ensures the valve moves along the correct axis, allowing the valve head to seat precisely against the valve seat for perfect sealing.
Heat Dissipation: Transfers high-temperature heat from the valve head through the valve stem to the cylinder head, where it is carried away by the cooling system.
Wear Protection: Acts as a sacrificial component, absorbing the reciproing friction of the valve stem to protect the expensive cylinder head from wear.
Lubriion & Sealing: The bore retains a small amount of oil to lubrie the valve stem-to-guide interface, reducing friction resistance.
Failure Symptoms
⚠️ Inspect immediately if any of these occur
Symptom
Probable Cause
Significantly increased oil consumption; blue smoke from exhaust
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 ...
