Repair Procedures

Workshop-style remove-and-install procedure for the OM642 exhaust gas recirculation positioner (Y27/11) on the NCV3 Sprinter Model 906. Covers coolant pressure relief, hose clamp-off, EGR positioner removal, sealing-ring replacement, the 8 Nm valve-to-housing torque spec, and the post-install leak test.

Workshop-style remove-and-install procedure for the main fuel filter on Mercedes-Benz OM651 four-cylinder diesel engines fitted to the NCV3 Sprinter (Model 906) and late T1N (Model 900). Covers click-clamp removal, condensation-sensor handling, the installation arrow, and the leak-test run.

Replace the electric EGR valve on the OM646 four-cylinder NCV3 Sprinter. Covers coolant draining, intake-pipe removal, the four EGR-valve bolts, the new gasket and O-ring, the cooler-to-valve seal, electrical reconnection, and the post-install adaptation reset.

Bleed and flush the brake hydraulic system on the NCV3 Sprinter every 2 years to remove moisture-contaminated fluid that lowers boiling point and corrodes ABS components.

Replace the in-frame diesel fuel filter on the OM642 to prevent injector wear, improve cold-start behavior, and keep the high-pressure fuel system clean. Includes priming and air-bleed steps.

Inspect the NCV3 rear leaf-spring suspension for sagging springs, worn shackles, dead shocks, and shifted u-bolts.

Replace all 6 glow plugs and the glow plug control module (GPCM) on the OM642 3.0L V6 CDI. Failing glow plugs cause hard cold starts, white smoke on startup, and misfires. Always replace as a full set - never individual plugs.

Service the NAG-1 / NV241 transfer case on 4x4-equipped OM642 NCV3 Sprinters. Drain and refill ATF every 30,000 miles.

Drain and refill the front axle differential on 4x4 OM642 NCV3 Sprinters. Often-skipped service that prevents pinion bearing failure.

Drain and refill the rear differential gear oil on the OM642 NCV3 Sprinter to prevent ring and pinion wear. Service every 30,000 miles.

Replace the serpentine belt on the OM642 NCV3 Sprinter to prevent unexpected breakage that can leave you stranded.

Comprehensive inspection of the NCV3 front suspension - control arms, ball joints, sway-bar links, struts - plus service and replacement triggers.

How to replace front brake pads on Mercedes Sprinter vans. Covers T1N and NCV3 platforms.