Northern Lights 854B Engine

1. Do adjustment after cylinder head bolts are tightened and engine is stopped.
2. Turn engine by hand until inlet valve starts to open and exhaust valve starts to close.
3. Turn crankshaft one more turn and adjust clearance for this cylinder.
4. Loosen nut and adjust intake and exhaust valves with adjust screw.
5. Adjust each set of valves individually.
6. Replace rocker arm cover and tighten nuts evenly.

⚠ Do not hold pre-heat switch on over 30 seconds; glowplugs may burn out.

Tools: Test bulb

1. Loosen current-carrying flat wire between plug poles of glowplugs.
2. Connect a bulb between plus-pole of battery and plus-pole of glowplug.
3. If bulb lights up, glowplug is functioning.
4. Check all glowplugs and replace faulty ones.

⚠ Make absolutely sure no impurities enter the engine.

1. Remove cleaner by unscrewing center cap screw.
2. Wipe inside of filter housing.
3. Discard old cleaner if necessary and replace with new.
4. New style: wash in cleaning solvent or soap and water.
5. Make sure screen is in place before reinserting.
6. Reinstall foam filter only when completely dry.

⚠ Escaping fluid under pressure can penetrate skin; use cardboard or wood, not hands, to search for leaks.

Tools: Hand primer pump

1. Be sure there is adequate fuel in tank and open fuel shut-off valve.
2. Open bleed screw at top of fuel filter.
3. Pump hand primer and let air bubbles escape.
4. Close bleed screw.
5. For 753 open bleed cock; for other units see small pointers.
6. Push throttle to full speed and turn engine over a few seconds.
7. If needed, loosen fuel lines at injectors while cranking and tighten after bleeding.

⚠ Do not overtighten.

1. Remove and discard oil filters.
2. Make sure old gasket is removed and discarded.
3. Oil rubber gaskets on new filters and check contact surfaces.
4. Screw new filters until packing firmly contacts sealing surface.
5. Tighten a further half turn but not more.
6. Start engine and check for leakage.
7. Check oil level.

⚠ Place protection under screwdrivers to avoid damaging housing.

Tools: Two screwdrivers

1. Remove pump end cover.
2. Pry out impeller with two screwdrivers.
3. Be sure all pieces of a failed impeller are removed.
4. Clean inside of housing.
5. Press in new impeller and place sealing washers in outer end of impeller center.
6. Replace cover using a new gasket.

1. Check tension and wear after every 50 hours.
2. Correct tension if belts can be depressed about 3/4 in (17 mm) midway.
3. Replace belts operating in pairs in pairs even if only one is faulty.

⚠ Battery gas can explode; keep flames and sparks away from batteries.

Tools: Hydrometer

1. Check electrolyte level after every 50 hours.
2. Level should be about 3/8 in (10 mm) above cell plates.
3. Top with distilled water if necessary.
4. Make sure cable terminals are clean, properly fastened and greased.
5. Check specific gravity of electrolyte in each battery cell with hydrometer.

Tools: Cleaning rod

1. Loosen clamps holding both rubber ends to heat exchanger housing.
2. Remove both rubber ends from housing.
3. Pull heat exchanger core out on 753 only; on 843 and 854 clean in place.
4. Clean passages with cleaning rod and flush with water.
5. Clean accessible parts of housing.
6. Reassemble, ensuring divider in 854 heat exchanger seats between lips in rubber end.

⚠ Never use flushing oil.

Tools: Hand pump

1. Run engine until warm.
2. Remove cap from oil tube.
3. Attach hand pump to end of oil tube and drain by pumping.
4. Replace cap on oil tube and tighten securely.
5. Refill engine with recommended oil.

1. Open drain cock.
2. Remove drain plug and drain oil.
3. Refill with recommended oil.

1. Retighten after first 50 hours of operation.
2. Tighten bolts when engine is cold.
3. Loosen nuts and remove rocker arm cover.
4. Tighten bolts sequentially in order shown in manual.
5. Use model-specific torque values.