Valve spring retainer to crosshead clearance. Tighten must be a minimum of 0.025 inch clearance.įig.2-19. Check the clearance between the crosshead and valve spring retainer 1 and 2. Note: When ST-669 Torque Wrench Adapter is used, tighten the locknut to 22 to 26 ft-lb torque.Ĥ. Tighten the adjusting screw locknut to 25 to 30 ft-lb torque. Hold the adjusting screw in this position and tighten the locknut.ģ. Turn the adjusting screw back in until it touches the valve stem. Hold the crosshead down against its mating valve stem. Turn the adjusting screw out at least one turn.Ģ.

Loosen the locknut on the crosshead adjusting screw. Note: Crosshead adjustment should always be made before attempting to adjust the valves.ġ. Pay attention to reading and you will learn more. 89118 Ph: (702) 649-2366 or (702) 649-0648 Fax: (702) 649-4133 Facebook.This post is mainly written to introduce how to adjust crosshead, injector and valves of Cummins NT diesel engines correctly. Motor Mission Machine & Radiator 5435 Desert Point Dr. If you need any gasoline or diesel engine machine work or anything machine shop related we are located in Las Vegas, Nv.

The Cummins Big Cam engine is an inline 6 cylinder diesel engine that is often found powering on highway Class 8 trucks such as Freightliner, Peterbilt, Kenworth, Navistar, and many others. It isn’t uncommon to have to line bore the housing bore, machine the counterbores, bore and sleeve the lower seal areas, and surface the deck to make it flat and square on many engines. The counterbores were also checked around their circumferences for depth and squareness to make sure the liners were seating square and flat in the block. The cylinder heads were also checked on their surfaces for warpage and pressure tested before any surfacing and milling was performed in order to try and diagnose the problem. This was the first thing we did because the engine came in due to coolant contamination in the oil. We had to remove the cylinder liners from the block before we could get a good look at the lower bores.

This is a Cummins NTC350 Big Cam III cylinder block, cylinder heads, and rocker boxes that came in to be cleaned, magnafluxed, measured, inspected, and machined.

350 big cam cummins