I am in OKC right now and only awake because of the dog. In this article we cover a basic tune up for a Detroit Diesel 71 Series inline engine. Detroit 60 series valve adjustments. Limiting Speed For Your Mechanical Governor Of Your 71 Series Inline Engine. Valve Clearance Adjustment (Hot Engine). 016" feeler gage (plus or minus 0. Their position determines the amount of fuel injected into each cylinder and ensures equal distribution of the load.
Bar the engine in the direction of rotation and observe the intake and exhaust valve rollers at any cylinder that is close to TDC (top dead center). This is often an overlooked task for proper engine maintenance; however, neglecting your valves could lead to a lot of unwanted hassles like loss of power and decreased fuel efficiency. Once the initial measurements and adjustments have been made, any adjustments beyond this point should be made only as required to maintain satisfactory engine performance. However, if a hot engine adjustment is desired use the following procedure. If it does continue to increase the spring tension. Start the engine and loosen the idle speed adjusting screw locknut and adjust the iddle screw to obtain the desired engine idle speed. Only remove the brake housings necessary to provide access for adjustment. Valve Lash, Injector Height (Timing) and Jake Brake® Lash Adjustments. FUEL INJECTOR HEIGHTS Models: 6067TKXX, 606XPKXX, 606XGKXX (1997-98 DDEC IV and later 1997 DDEC III). When do I need to have a valve adjustment?
Either of those scenarios could end up costing you more money than getting your engine serviced by professionals. NOTE: The above step should result in placing the governor linkage and control tube assembly in the same position that they will attain while the engine is running at full load. 1 as outlined in Step 6. Use tool J–45002 w/101J cam. Bar the engine over in the direction of normal rotation until the next cylinder in the adjustment sequence is in its valve overlap period. Start and drive the vehicle to verify proper Jake Brake® performance. The following video posted on Youtube by user " adrossi85" is a great example of how to limit the speed for your mechanical governor for the 71 Inline series.
Why You Need a Valve Adjustment for Your Diesel Engine. "Valve Lash and N3 Injector Setting Adjustment Sequence". Adjust Model 790/795 Jake Brake® slave piston lash as follows: - Turn in the adjusting screw until the solid side of the slave piston bridge assembly, contacts the exhaust valve and the valve springs begin to compress, then turn in one additional turn. Rotate the engine when necessary to put the exhaust valves in the closed position for slave piston adjustment. Repeat the adjustment procedures in steps 1 through 6 for the remaining cylinders. The exhaust valve bridges must be adjusted and the adjustment screws locked securely at the time the cylinder head is installed on the engine. Move the spring retaining bolt in the slot of the speed control lever until the center of the bolt is on or slightly over the center (toward the idle speed position) of an imaginary line through the bolt, lever shaft and eyebolt. Using Timing Gage on DDEC II, DDEC III, and DDEC IV. 1 injector rack in the full fuel position.
Securely lock the adjusting screw locknut. Table 17 in the manual recommends the 60K mile initial valve lash adjustment. FUEL INJECTOR HEIGHTS Models: §. Note: Be sure the external starting aid screw (if used) is back out far enough to make it ineffective when making this adjustment. After each set of intake and exhaust valves is adjusted, adjust the corresponding injector listed in Table "Valve Lash and Injector Height Adjustment Sequence". At this time, if the valve clearance is correct, the. Valve Adjustments For Your 71 Series Engine. Adjust engines with variable speed mechanical governors after adjusting the exhaust valves and timing the fuel injectors. The Ins and Outs of DPF and DOC Cleaning. The preliminary adjustments consist of the first four items in the tune-up sequence.
Use a new gasket and install the governor cover and lever assembly. "Checking Tolerance Chart". To correct this condition, back off the inner adjusting screw slightly and tighten the outer adjusting screw slightly. FUEL INJECTOR HEIGHTS Models: 6067GT40, 6067WT40, 6067WU40, 6067GU40, 6063WU00, 6063GU00, 6067WU60, 6067GU60, 6067GU91 (All DDEC I and DDEC II / 1986 - 1993). 1 injector rack control lever first, to establish a guide for adjusting the remaining injector rack control levers. † When setting injector heights or valve clearances, the component should be set to the "Setting Dimension" shown. Adjust the governor linkage. The exhaust valves are adjusted the same way as the intake valves, except use a 0. ) Adjust the load limit screw.
Return the speed control lever to the idle speed position. NOTE: If the maximum speed no-load speed is raised or lowered more than 50 rpm by the installation or removal of the governor shims, the governor gap should be rechecked. 10" and approximately 0. The timing can be started with any cylinder in valve overlap. At this time if the adjustment is correct, the. Feeler gage between the tip of the valve stem and the valve button at the end of the rocker arm. Fuel Injector Height Adjustment. 279 mm) feeler gage is used for intake valves. The following types of governors are used.
Note: The slave piston adjusting screws used in the Series 60 engine brake prior to August 1994 were reset screws. What is a valve adjustment? Persons engaging in the procedures do so entirely at their own risk. Discard the gaskets. He recommends doing them every 50 to 60 thousand miles but of course he wants the work. If it does not reduce the booster spring tension. Position Injector Rack Control Levers. 008" feeler gage will pass freely between the end of the valve stem and the rocker arm and the. Note: When positioning the injector racks on an early engine equipped with a fuel modulator, be sure no interference is encountered from the fuel modulator. If the engine is equipped with a supplementary governing device adjust it at this time.
The objective is to adjust all six injectors to the same feel. When you adjust the timing, you can alter when the engine injects the fuel, therefore changing when combustion occurs.
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