Northern Lights — Valve Clearance Check and Adjustment

Adjustments · Valve train

From a Northern Lights owner's manual covering: NL445D, NL445D1, NL445T1, NL445T2, NL668T2. Check it applies to your exact model before use.

Applies to: Northern Lights NL445D1, Northern Lights NL445T1, Northern Lights NL445T2, Northern Lights NL668T2, John Deere 4045D150 / 4045T150 / 4045T250 / 6068T250 engine

Procedure

1. Disconnect the NEGATIVE (-) battery terminal to prevent accidental starting.
2. Remove the rocker arm cover and crankcase ventilator tube.
3. Remove the plastic plugs or cover plate from the flywheel housing timing holes.
4. Rotate the engine clockwise with a flywheel turning tool to No. 1 cylinder TDC compression stroke and insert the timing pin.
5. Check and adjust intake valve clearance to 0.35 mm (0.014 in) and exhaust valve clearance to 0.45 mm (0.018 in).
6. Loosen the locknut on the rocker arm adjusting screw; turn the screw until a feeler gauge slips with a slight drag.
7. Hold the adjusting screw and tighten the locknut to 27 Nm (20 lb-ft); recheck clearance.
8. Replace the rocker arm cover and crankcase ventilator tube.

Full service-parts list: Northern Lights NL445D1 →, Northern Lights NL445T1 →, Northern Lights NL445T2 →, Northern Lights NL668T2 →, John Deere 4045D150 / 4045T150 / 4045T250 / 6068T250 engine →

Source: Northern Lights owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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