Northern Lights — Check and Adjust Valve Clearances

Adjustments · Valves

From a Northern Lights operator's manual covering: LP445D, LP445T, LP668D, LP668T. Check it applies to your exact model before use.

Applies to: Northern Lights LP445D, Northern Lights LP445T, Northern Lights LP668D, Northern Lights LP668T, John Deere Powertech 4045 engine, John Deere Powertech 6068 engine

Procedure

1. Remove rocker arm cover with ventilator tube.
2. Remove plastic plugs in engine timing holes on front side of flywheel.
3. Rotate flywheel clockwise with Flywheel Turning Tool until Timing Pin engages timing hole; No. 1 cylinder rocker arms loose at TDC.
4. If not at TDC, remove timing pin, rotate flywheel one complete turn, and reinstall pin.
5. Check valve clearances with engine cold.
6. For 4-cylinder: adjust No. 1 and No. 3 exhaust and No. 1 and No. 2 intake at No. 1 TDC; rotate 360° and adjust remaining.
7. For 6-cylinder: adjust No. 1, No. 3, No. 5 exhaust and No. 1, No. 2, No. 4 intake at No. 1 TDC; rotate 360° and adjust remaining.

Full service-parts list: Northern Lights LP445D →, Northern Lights LP445T →, Northern Lights LP668D →, Northern Lights LP668T →

Source: Northern Lights operator'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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