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Isuzu Genuine Collar Split For NKR NPR TFR TFS VC46 700P 5125650040 5-12565004-0

Isuzu Genuine Collar Split / Valve Keeper /Valve Locks /Valve Collets for NKR NPR TFR TFS VC46 700P 5125650040 5-12565004-0 , Fit for 4JB1/4JB1T/4HK1/6HK1/6UZ1 engine . One-stop ISUZU truck parts supply OVER 29 YEARS .DM us now .

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Description

Isuzu Genuine Split Valve Locks & Collet Keepers (OE 5-12565004-0 / 5125650040)

Factory valve stem locks engineered for Isuzu 4JB1, 4JB1T, 4HK1, 6HK1, and 6UZ1 commercial diesel cylinder heads across NKR, NPR, and 700P chassis.

Technical Specifications & Vehicle Applications

Part Name:	Isuzu Genuine Collar Split / Valve Keeper / Valve Locks / Valve Collets
Part Numbers (OE):	5125650040, 5-12565004-0
Truck Model Fit For:	Isuzu NKR, NPR, TFR, TFS, VC46, 700P Commercial Series
Engine Fit For:	4JB1, 4JB1T, 4HK1, 6HK1, 6UZ1 Diesel Platforms
Function:	Locks the valve spring retainer securely against the valve stem groove to prevent valve drop during high-speed reciprocating cycles
Material:	High-durability alloy composition engineered for cyclic fatigue resistance
Place of Original:	China (Qingling Factory Line)
Quality Standard:	QINGLING Quality (China Isuzu Genuine Production)
Color / Surface:	Machined alloy finish as shown in product photos
MOQ:	1 Set (Single repair pairs to bulk cylinder head rebuild lots)
Packing:	Neutral box / color box / customer brand package
Shipping Modes:	By Express, By Sea, By Air, By Railway (Worldwide shipping)
Delivery Time:	1 to 8 working days from inventory
Payment:	T/T, PayPal, Western Union, Trade Assurance
Warranty:	1 Year Factory Guarantee

Isuzu genuine valve split collar lock assembly OE 5-12565004-0

Workshop Notes on Valvetrain Assembly

When rebuilding cylinder heads on 4HK1 or 6HK1 diesel engines, valve collets endure continuous impact from high-lift cams and dual-spring pressures. Always replace valve keepers in complete pairs rather than mixing old and new halves, as uneven taper wear can cause the retainer to cock sideways under load.

Before removing spring compression clamps during assembly, verify that both split halves seat cleanly inside the retainer taper with their internal beads locked into the stem groove. An unseated lock will cause the valve to drop straight into the combustion chamber upon initial startup, destroying the piston crown and cylinder liner.

Component Details & Locking Mechanism

Precision pair split design of Isuzu valve stem locks

Symmetrical Half-Pair Architecture: Each set is machined in matching halves that form a complete circle around the valve stem, balancing spring thrust evenly around the entire circumference.

Self-Tightening Outer Taper: The machined outer angle wedges tighter into the spring retainer bore as spring pressure increases, maintaining an unbreakable mechanical lock during engine acceleration.

Accurate Internal Locating Beads: Internal ribs are broached to exact factory tolerances to sit firmly in the stem groove with zero vertical slack or binding.

Companion Cylinder Head & Valvetrain Overhaul Spares:

We supply complete valvetrain rebuild kits. Combine matching components for consolidated export delivery:

Valve Stem Oil Seals

Engine Piston Rings

Connecting Rod Assembly

Commercial vehicle diesel engine internal overhaul components stock

Complete chassis running gear suspension and steering spares

Chongqing Guanglian Qingling Auto Parts Co., Ltd.

Operating in Chongqing near the Qingling manufacturing base since 1997, our facility distributes factory-original Isuzu powertrain spares, valvetrain hardware, and aftermarket truck components to commercial fleet operators globally. Review our warehouse export operations »

Direct supply channels for Qingling Isuzu commercial engine and valvetrain parts. Full coverage for 4JB1, 4HK1, 6HK1, and 6UZ1 diesel engine rebuild programs. Inspection checks on taper dimensions and locking rib tolerances before packing. Consolidated air courier and ocean container dispatch for repair workshops and fleets.

Chongqing central logistics and commercial vehicle spare parts storage

Isuzu commercial truck master parts model index

High-density racking storage for diesel engine and drivetrain components

Global commercial vehicle partner networks and brands

Chongqing Guanglian Technical Inquiries & Orders

Send your engine model code, vehicle VIN, or valve keeper OE part number to our technical sales team for parts catalog cross-checking and wholesale rates.

Address:
Baishiyi, Jiulongpo District, High-tech Zone, Chongqing, China

WhatsApp / WeChat:
+86 17383152089

Email:
ZCMisuzu@guanglian99.com