Description
VAG 1.9 TDI PD AJM Complete Cylinder Head Assembly – Valves & Camshaft Pre-Installed
This VAG 1.9 TDI PD AJM cylinder head — OEM reference 038103351D (AMC 908816) — is a brand new casting, machined to OEM tolerances and supplied as a fully assembled head with 8 valves, springs, retainers, stem seals, guides, hydraulic lifters, PD camshaft and injector roller rockers already fitted. For a workshop doing an AJM head replacement, that removes the most time-consuming part of the job — lapping valves, setting installed heights and torquing the camshaft caps — and lets you move straight to transferring injectors, manifolds and timing components.
The AJM Engine — What You Need to Know
The AJM is a 1.9-litre inline-4 SOHC 8-valve turbo diesel using the Volkswagen Group Pumpe Düse (PD) unit-injector system. It is rated at 85 kW (115 PS) at 4,000 rpm and 285 N·m at 1,900 rpm, with a 18.0:1 compression ratio and a bore and stroke of 79.5 mm × 95.5 mm.Unlike the earlier VE-pump 1.9 TDI, the PD injectors are actuated mechanically by extra camshaft lobes through roller rockers — which makes camshaft quality and lobe hardness absolutely critical on these engines.
The AJM was fitted to a range of longitudinal and transverse VW Group models from 1998 to 2004, including Audi A4 B5, VW Passat B5, VW Bora Variant and VW Golf IV Variant. The 038103351D / 03G103351C casting is also shared with many other 8-valve PD codes, including ATJ, AUY, AVF, AWX, ASZ and ARL, so this head has broad coverage across the 1.9 PD range.
Why These Heads Fail
The 1.9 PD engine is durable, but the head is where high-mileage wear shows up first:
- Camshaft lobe wear and hydraulic lifter failure — the PD injector lobes are highly loaded and wear prematurely on stretched oil change intervals
- Cracking between the valve seats — usually after an overheating event or coolant loss
- Valve guide wear — oil consumption, blue smoke on startup, failed emissions tests
- Valve seat recession from high combustion temperatures
- Warping from a failed head gasket or a low-coolant event
- Injector bore sealing problems and copper washer seat wear — causes compression loss and hard cold starting
Once a PD head has been resurfaced past minimum thickness it cannot be reliably saved, and a worn PD camshaft will damage the injector rockers if not replaced with the head. This complete cylinder head assembly restores the top end to factory condition without the turnaround time of a rebuild.
What’s Included – Fitted to the Head
The following components arrive pre-installed and ready to use:
- Cylinder head casting — new aluminium alloy, pressure-tested and flatness-checked
- 8 valves — 2 per cylinder, intake and exhaust, heat-resistant
- Valve springs, spring seats and retainers
- Valve stem seals — fitted
- Valve guides — pressed in
- PD camshaft — SOHC, with unit-injector actuation lobes
- Hydraulic lifters / tappets — pre-installed
- Injector roller rockers / follower arms — fitted
- Camshaft bearing caps and bolts — torqued to specification
- Core plugs and oil gallery plugs — installed
- Valve seats — machined and sealing-checked
What You Transfer From Your Old Head
These parts are not supplied and must be reused or replaced during the job:
- Unit injectors (Pumpe Düse elements) and copper sealing washers
- Injector hold-down clamps and adjusting screws
- Glow plugs
- Valve cover / rocker cover and gasket
- Camshaft sprocket and hub
- Timing belt, tensioner, idler and water pump
- Head bolts — always fit new stretch bolts
- Head gasket and remaining gaskets and seals
- Intake manifold, EGR valve and anti-shudder valve
- Exhaust manifold and turbocharger (Garrett VNT15 / VNT17 depending on application)
- Tandem pump, vacuum pump, sensors and wiring
Unit injector rocker adjustment and injection timing must be set on installation using the correct VAG diagnostic procedure and special tools. Please refer to the manufacturer’s service manual for the AJM engine before fitting.
Vehicle Compatibility
Fitted to a wide range of VW Group models running the AJM 1.9 TDI PD engine. Always confirm your engine code and OEM number before ordering — the 1.9 TDI was built in VE-pump, PD and later common-rail forms with heads that are not interchangeable.
- Audi A4 B5 (8D2) Saloon — 1.9 TDI AJM (2000–2000)
- Audi A4 B5 (8D2) Saloon quattro — 1.9 TDI AJM / ATJ (2000–2000)
- Audi A4 B5 Avant (8D5) — 1.9 TDI AJM / ATJ (2000–2001)
- Audi A4 B5 Avant (8D5) quattro — 1.9 TDI AJM / ATJ (2000–2001)
- Audi A4 B6 (8E2) Saloon — 1.9 TDI AVF / AWX (2000–2004) — same 038103351D casting family, verify before ordering
- VW Bora Variant (1J6) 1.9 TDI 4motion — AJM / AUY (1999–2001)
- VW Golf IV Variant (1J5) / Golf Van — 1.9 TDI AJM (1999–2002)
- VW Passat B5 (3B2) Saloon — 1.9 TDI AJM / ATJ (1998–2000)
- Other models where the AJM engine has been fitted (confirm via OEM number)
Why Buy This AJM Head From Us
- Brand new casting — never reconditioned, never welded, never resurfaced from a used head
- Pressure-tested and vacuum-tested before dispatch
- Flatness checked to OEM tolerance — no surprises when you torque it down
- Camshaft lobes hardened and profile-checked for correct PD unit-injector actuation
- Reinforced valve-seat and injector-bore areas to resist the thermal cracking these PD heads are known for
- 8 valves, hydraulic lifters, roller rockers and camshaft already fitted — hours of bench time saved per job
- 12-month warranty for trade and retail customers
- Crated for international freight; shipping to port or door
If you are sourcing a 1.9 TDI PD cylinder head for an Audi A4 B5, VW Passat B5, Bora or Golf IV rebuild, or you need an AJM head assembly in volume for a workshop or parts distributor, this unit gives the engine a factory-fresh top end. Message us with your OEM number and a photo of your original head before ordering.
Browse More VAG Cylinder Heads & Contact Us
- Full range: View our complete VAG cylinder head catalog.
- Fitment check: Send us your engine code and a photo of your original head on WhatsApp for a same-day compatibility confirmation and freight quote.
