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Autopapyrus · DAF XF 12.9 MX-13 303 (2017)
https://autopapyrus.com/guides/daf/xf/cylinder-head-installation/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

DAF XF 12.9 MX-13 303 (2017): Cylinder Head Installation

Installing the cylinder head on the MX-13 is a multi-stage procedure with strict requirements for surface preparation and bolt tightening. The manufacturer requires new bolts only and strict adherence to the multi-phase torque sequence with angle tightening. The procedure is critical for sealing the combustion chamber, coolant passages and oil galleries.

Difficulty: Hard Time: 18-22 hours Steps: 16 Tools: 3/4" torque wrench (up to 400 N·m), angle gauge for bolt tightening, M18 and M12 sockets, feeler gauge, precision straightedge, dial indicator, plastic scraper, brass brush, torque wrench for injectors, socket and handle set

Part

  • 🔩 Cylinder head gasket 2252092 or 2252092PE (genuine PACCAR), M18 cylinder head bolts (26 pcs) and M12 bolts (7 pcs) - new bolts only

Step by step

16 steps
  1. Prepare the block surface - clean the block mating surface ONLY with a plastic scraper and a brass brush (the manufacturer STRICTLY PROHIBITS power tools on an aluminum alloy block). Remove old gasket residue, oil traces and carbon deposits.
  2. Check block and head flatness - use a precision straightedge to check the flatness deviation of the block and head (the maximum allowable deviation depends on the length checked - for a 300 mm section, the maximum is 0.05 mm). If it is exceeded, have the surface machined or replace the head.
  3. Clean the bolt holes - use a thread-cleaning brush to clean the threads in the block of oil and sealant (the holes are blind - any remaining liquid will cause hydraulic lock when tightening and may crack the block).
  4. Install the new head gasket - unpack the 2252092PE gasket immediately before installation (it is an MLS multilayer steel gasket) and place it on the block strictly over the dowel pins (orientation - the TOP marking must face up).
  5. Install the cylinder head - carefully lower the head onto the block using a hoist (head weight is about 150 kg), seat it on the dowel pins, and make sure the gasket does not shift.
  6. Install the new head bolts - install 26 M18 bolts and 7 M12 bolts (MX-13 head bolts are single-use only, reuse is prohibited). Lightly lubricate the bolt threads and the bearing surfaces under the bolt heads with engine oil.
  7. Tighten the M18 bolts (phase 1) - using a torque wrench, tighten all 26 M18 bolts to 70 N·m (52 lb-ft) in a sequence from the center outward (tightening pattern - start with the center bolts, then spiral out toward the edges).
  8. Tighten the M18 bolts (phase 2) - bring each M18 bolt to 250 N·m (184 lb-ft) in the same sequence.
  9. Tighten the M18 bolts (phase 3) - using an angle gauge, turn each M18 bolt an additional 90 degrees (it helps to first mark the bolt head and the adjacent surface of the block with paint).
  10. Tighten the M18 bolts (phase 4) - turn each M18 bolt another 90 degrees (so each M18 bolt turns a total of 180 degrees after phase 2).
  11. Tighten the M12 bolts (phase 5) - tighten the 7 M12 bolts to 60 N·m (44 lb-ft) in the sequence specified by the manufacturer.
  12. Tighten the M12 bolts (phase 6) - turn each M12 bolt an additional 120 degrees.
  13. Install the rocker arms and shafts - install the rocker arm assemblies on the head and tighten the rocker arm mounting bolts to the specified torque (the rocker arms are tightened AFTER the head is installed but BEFORE the injectors are installed).
  14. Install the injectors - install the injectors in the head bores and tighten the hold-down clamps with the special torque wrench per the specification (for injector torque and sequence, see the manufacturer's manual).
  15. Reconnect the cooling and fuel systems - connect the coolant hoses to the head, the high-pressure fuel lines to the injectors, and the electrical connectors to the sensors and injectors.
  16. Leak check - fill with coolant, start the engine, warm it up to operating temperature, and check for coolant and oil leaks at the block-to-head joint and at the injectors.

Common mistakes and warnings

  • MX-13 head bolts are single-use only. Retightening old bolts will lead to combustion gas leakage and head gasket failure. The manufacturer prohibits power tools for cleaning the block mating surface - use only a plastic scraper and a brass brush by hand, otherwise there is a risk of damaging the aluminum surface. The MLS gasket requires strictly clean surfaces with the correct surface finish (neither rougher nor smoother than the factory condition). Failing to follow the torque values or sequence will lead to head distortion and a blown gasket. This job requires experience with heavy-duty diesel engines and calibrated torque tools - if you lack experience, contact a DAF service center.