Do-it-yourself auto repair

VW Transporter 2.5 TDI (ACV) T-belt & High Pressure Fuel Pump Belt Replacement

Your vehicle has passed another 120 thousand km. It's time to replace the fuel pump belts and timing belts; work sequence described in this article is suitable for AXL, AJT, ACV, AXG, AHY, AYY, AYC, AUF engines.

The main feature of all motors of different release years is the work sequence with the body parts in the initial stage of disassembly. Hinged equipment special powerful version is of 111 kW (152 hp), but they are rare and differ only in the other (full-size) intercooler, another V-belt system drive, air conditioning radiator, a turbine with variable geometry, and other layout of the intake system (AHY and AXG engines).

For the execution of works, we need aids and special tools, such as:

  • 32 Tensioner Roller Bent
  • Crankshaft Pulley Lock
  • Pump Gear Pulley Lock
  • Camshaft Pulley Lock
  • Dial Gauge Holder
  • Probe
  • Base Pad
  • Torque Wrench of 100-200 Nm, 20-60 Nm

All work will be conducted in the pit, so you need to put the vehicle so that the right wheels are as close as possible to the edge, it will provide ease of operation. Wait until the engine cools down, then start work. Let’s start.

Remove the pump and timing belts

1) Remove as follows:

  • Radiator Grill.
  • Insulated Pallet.
  • Intercooler Bolster.
  • Fuel Flow Meter Connector.
  • Washer Jar Extension.
  • Air filter lid and cabin filter housing, first remove the clamp from the supply duct.


Radiator grill VW Transporter 2.5 TDIExtender tank inhabitant VW Transporter 2.5 TDIAir filter cover VW Transporter 2.5 TDIAir filter VW Transporter 2.5 TDI

2) Unscrew front end carrier bolts on right and left.

Bolts frame radiator VW Transporter 2.5 TDI
3) Pull the carrier and radiator towards.
4) Rotate the wheels to the right until they stop.
5) In the top left of the radiator, find and disconnect the power steering pump hose clamp, the ends of the tube need to be drown with suitable plugs.
6) Press the borders out of the carrier, unfix them.
7) Take the carrier to the right (do not disconnect coolant system hoses), in order to avoid falling fix with the wire.
8) Remove the protective covers of both belts, and cylinder head cover.

Protective casing of a gear belt VW Transporter 2.5 TDIProtective casing of a gear belt VW Transporter 2.5 TDIProtective casing of a gear belt VW Transporter 2.5 TDI

9) Discharge pressure in the coolant system, open and close the surge tank cap. Then, drain the coolant, prepare the container of 8-10 liters.

Еxpansion tank VW Transporter 2.5 TDIThe coolant drain plug on the VW Transporter 2.5 TDI

10) Loosen M8 bolts on the power steering pump pulley (3 pcs.)

11) Take the ribbed belt with both hands on the left and right of the power steering pump and slowly pull the belt by hands, gradually increasing force (belt should be pulled in the direction of the arrow), then remove the belt from the power steering pump and the other pulleys.

V-ribbed belt for 2.5 TDI

12) Remove the power steering pump pulley and intermediate V-belt rollers.

13) Install the crankshaft to UDC of cylinder 1.

Crankshaft VW Transporter 2.5 TDI on UDCMarks UDC VW Transporter 2.5 TDI

Marks of the pump pulley / bracket C and housing flywheel / clutch A (manual transmission) or clutch disc / clutch B (automatic transmission) are to match. If all the marks do not match, you have to turn once the crankshaft clockwise.

14) Fix the crankshaft and unscrew the center bolt, remove the crankshaft pulley damper.

Torque is rather large, to avoid injury use high-quality tools and reliable methods of fixation!

Central bolt crankshaft VW Transporter 2.5 TDI

15) Unscrew the damper central bolt.

16) Loosen vibration damper bolts with a cogged pulley (bolts M8) and unscrew two bolts located opposite.

17) Unfix the two remaining bearing bolts in order to detach vibration damper from the lower crankshaft gear by weak tapping by a hammer on the bolt heads.

18) Remove the vibration damper.

19) Unscrew the camshaft bolt using the counter support (3-5 turns).

20) Using a hammer and punch bring down gear from the camshaft cone through the hole in the T-belt cover.

Camshaft gear cone VW Transporter 2.5 TDI

21) Unscrew the two bolts inside from the plastic protection of the timing belt.

22) The camshaft gear on the pump belt side is fixed by a special key (3036), bolt is unscrewed by 3-5 turns.

23) Unfix the pump belt tensioner roller, remove the pump belt, as well as the gear on the pump belt side.

Belt tensioner pump VW Transporter 2.5 TDI

24) Remove the distal roller and check studs sinking in the head housing.

25) Unscrew the four bolts fixing the oil filler.

Bolts oil filler cap VW Transporter 2.5 TDI

26) Remove the valve cover, pre-need to unscrew the four bolts #13.

27) Remove the lower part of the T-belt cover.

The lower part of toothed belt VW Transporter 2.5 TDI

28) Mark the running direction of the T-belt (Note: only if its replacement is not planned).

29) Unload a tension roller of the T-belt, using a spanner wrench 32. For this, first unscrew the bolt 13 and remove the roller.

Tension roller timing belt VW Transporter 2.5 TDI

30) Remove the timing belt tensioner.

31) Unscrew three pump bolts and remove the pump.

32) Remove internal plastic protection of the timing belt.

The engine is dismantled, now begin preparatory work.

Let’s start pump belt and T-belt installation

Before you start the installation of belts, pumps and pulleys, start the installation of injection timing. The work is performed in the order described below.

Injection Installation

  • Unscrew plug 12 from the pump belt, insert dial gauge screw instead of the screw plug.
  • Insert the dial gauge in adapter (approximate measuring range is 0-3 mm) with a preload of about 2.0 mm.
  • Check the marks match on the pump belt and pulley.
  • Loosen bearing bolt (2) on the pump belt.
  • Remove the spacer (1).
    Spacer and fixing bolt
  • Set the indicator at 0.
  • To make sure that the plunger pump is at BDC, smoothly turn the pump pulley using a spanner wrench #21 (clockwise). Once the needle of the dial gauge stops its movement, the BDC is reached, set the dial gauge to 0.
  • Rotate the pump pulley counterclockwise using the wrench #21, rotate it until the dial gauge needle moves by 0.55 mm.
  • Tight the locking bolt 1 on the pump belt with torque of 30 Nm.
  • Remove the dial gauge, screw up the plug into the hole.
  • Check if the BDC mark on the flywheel matches the original mark.

We choose original replacing kit.

Proceed to install the timing belt and pump

So far everything is disassembled, you can see the state of the camshaft seals and front crankshaft seal.

All metal and plastic parts are washed.


  1. Check if the BDC mark on the flywheel matches the original mark.
  2. Fix a camshaft using a template (2065 A).

  3. Insert a probe into the camshaft slot (it usually equals 0.40mm).

Start installation:

  • The pump. Before installation, we recommend to apply a light layer of sealant on a rubber ring, then, put three bolts for the pump centering. Tighten only the right bolt, remove the remaining two bolts.
  • T-belt inner cover. Screw the two bolts that secure both the pump and protection. Put the top two bolts on the threadlocker for screwing the head protection.
  • Camshaft gear, bearing bolt is put by hand. Check the absence of distortions and free rotation of the pulley.
  • Install the tensioner roller (1) so that the tensioner roller tab (2) gets into the catch pin of the belt cover bottom part.

  • Put the timing belt starting from the crankshaft.

  • Tighten the fixing bolt of the tensioner pulley.
To tighten the timing belt, turn the roller clockwise, the right edge of the pointer (A) must match the right edge of the pointer (B).


  • Tighten the tensioner pulley bolt with torque of 20 Nm.
  • Check if the crankshaft is in the UDC of cylinder 1, if necessary, adjust it.
  • Tighten the camshaft pulley bolt using the base (3036); do not forget to take into account the bolt strength: 8.8 = 85Nm, 10.9 = 100Nm.
  • Remove the template (2065 A) from the camshaft.
  • Install the lower belt cover.
  • Install the vibration damper.
WARNING! Diamond washer, this washer is installed between the damper and the crankshaft gear.
  • Install the base (T10025) and tighten the center bolt of the damper pulley (crankshaft torque of 160Nm). Complete rotation in two steps, 90 degrees each. We recommend to lubricate the threads and the central bolt head with oil.
  • Rotate the crankshaft in two turns in the direction of the engine rotation so as the crankshaft is back to the UDC of cylinder 1.
  • Re-check the position of the tensioner pulley pointer. If the right edges of the pointers A and B do not match, repeat the tension step.
  • Close the outer timing belt cover.
  • Install the valve cover.
  • Screw oil filler neck.

Pump Belt Installation

  • Check if the initial mark matches the UDC on the flywheel.
  • Install belt on the injection pump pulley.
  • Insert the belt into the pump pulley and fasten the camshaft pulley, later crank the pulley.
  • Check the installation position of the guide roller: crank the guide roller so that the pointer coincides with the flange contour of the cylinder head.
  • Tighten the nut (2) with torque of 20Nm.
  • Install the tensioner roller (1) so that the roller tag gets into the beam cave (arrow B). Tighten the bearing bolt.
  • For tension of the timing belt, turn the tensioner roller counterclockwise in the position where both pointers are located against each other (arrow A).
  • Tighten the bearing bolt with torque of 15Nm.
  • Tighten the pump pulley nut with torque of 160 Nm. Use the base 3036. Make sure that fixed pump pulley is not tightened.
  • Loosen the pump fixing bolt (2).
  • Install the spacer (1) and tighten the bolt to 12 Nm.
  • Rotate the crankshaft in two turns until it snaps in the UDC of cylinder 1.
  • Check the position of the marks on the tension roller (arrow A). With the proper position, the pointers will be against each other. A slight shift of the front pointer is acceptable, but the pointer in any case should not go beyond the plate edge, where the pointer is located behind. If the front pointer goes outside the plate edge of the second one, the tension should be repeated.
  • Install the pump belt protection.

Install all previously removed parts, charge the coolant, run the engine. After starting, you need to control all connections for leakage, put insulation pallet. Now you can drive.