Knocking in crankcase at lower RPM has 38000km. Thinking timing chain or oil pump

The oil level may be fine, but the oil may be too thick, or you could have a worn engine bearing or a weak oil pump.
The engine could have some sludge or dirt blocking a oil port.

Check your owner's manual for the recommended mileage for replacing your timing chain. Replacement for a Nissan Maxima is 60,000 miles.2 Locate the timing chain. Replace it if the automatic chain adjuster (also known as the tensioner) is damaged or worn.3 Release the pressure in the fuel system, drain the cooling system and disengage the negative battery cable. 4 Undo the upper radiator hose, engine drive belts, power steering pulley and pump with bracket, air duct, passenger front wheel and engine side and undercovers, front exhaust pipe, cylinder head front mounting bracket and head cover, rocker cover, distributor and distributor cap and spark plugs.5 Take off the intake manifold support and move the No. 1 piston at "Top Dead Center" (TDC) of the compression stroke.6 Disconnect the cylinder head front cover, water pump pulley, thermostat housing, upper and lower tensioner and slack side timing chain guide, idler sprocket bolt, camshaft sprocket bolts, sprockets, mounting caps and camshafts. 7 Disengage the cylinder head with the manifolds, idler sprocket shaft, upper timing chain, center crossmember, oil pan and strainer assembly, crankshaft pulley, engine front mount and bracket and the front timing cover. Remove the oil seal and unfasten the timing chain cover, idler and crankshaft sprockets and the oil pump drive spacer. 8 Unfasten the timing chain guide. install Your Timing Chain 1 Grease the oil seal lip with engine oil and place it in the front cover. Verify that the No. 1 piston is at "Top Dead Center" (TDC) of the compression stroke. 2 Reconnect the crankshaft sprocket (marks should point toward the engine's front), oil pump drive spacer and timing chain guide and the lower timing chain. Line up all mating marks.3 Hook up the crankshaft sprocket and pulley, lower timing chain, front cover assembly, engine mount and front mounting bracket, oil strainer and pan assembly and center crossmember.4 Reattach the upper timing chain, idler sprocket (to the back side), cylinder head assembly, idler sprocket bolt and exhaust and intake camshafts. Place the intake camshaft knock pin at 9 o'clock and the exhaust pin at noon. Connect the camshaft bearing caps and distributor brackets and secure all mounting bolts.5 Eliminate any old material from the pan and cylinder block mounting surfaces. Rub on a 3.5 to 4.5mm bead of liquid gasket over the oil pan and cylinder block.6 Attach the upper timing chain to the idler sprockets and secure the cylinder head bolts.7 Refill the cooling system. Hook up the negative battery cable and any other disconnected items. Start the engine and look for leaks.

if you have oil pressure you are ok,my guess is the push rods may be plugged up with gunk,if the oil hasent been changed this could happen.

On your Sportster, the primary oil is not fed by the oil pump. It is not even part of the oiling system of your bike. You manually put the oil in the primary by pouring it in the hole where you check your primary chain tension. The maintenance schedule on your bike suggest that the oil in the primary be changed every 5000 miles. The primary holds approximately a quart of oil. The oil that lubricates your primary also lubricates your transmission. So, if your primary case was dry, your transmission was running dry as well.

Good Luck
Steve

M62 ENGINE TURN OFF RADIO FIRST. YOU NEED TO INSTALL A MEMORY SAVER BEFORE DISCONNECTING NEGATIVE BATTERY CABLE. TO KEEP FROM LOSING PCM MEMORY. TO REMOVE OIL PUMP.YOU NEED TO LOWER OIL PAN.REMOVE THE LEFT AND RIGHT ENGINE MOUNTS AT THE BOTTOM.REMOVE POWER STEERING PUMP AT THE HOLDER.REMOVE OIL PIPES AT THE POWER STEERING PUMP ALSO ON AUTOMATIC TRANSMISSION, REMOVE BANJO BOLT FOR THE OIL RETURN PIPE FROM THE OIL FILTER AT THE OIL PAN.REMOVE THE MOUNTING BOLT ON THE SPROCKET FOR THE OIL PUMP AND REMOVE THE SPROCKET ALONG WITH THE CHAIN,REMOVE 3 OIL PUMP MOUNTING BOLTS AND REMOVE THE OIL PUMP.REMOVE THE OIL PIPES OUT OF THE CRANKCASE. BEFORE INSTALLING NEW OIL PUMP, CHECK SEALS ON THE OIL PIPES AND REPLACE IF IT NECESSARY.LUBRICATE THE SEALS WITH OIL AND THE OIL PIPES.CHECK THE SEAL IN THE OIL PUMP AND REPLACE IF NECESSARY, SCREW THE HEXAGON ADAPTER BACK INTO THE OIL PUMP UNTIL IT STOPS.INSTALL OIL PUMP AND 2 RIGHT SIDE OIL PUMP MOUNTING BOLTS .TORQUE BOLTS 14 - 17 FT LBS. POSITION THE CHAIN ON THE PUMP AND SPROCKET AND INSTALL THE SPROCKET.TORQUE BOLT TO 35 FT LBS VERIFY THAT THE CHAIN IS POSITION CORRECTLY. ADJUST THE CHAIN SAG TO 0.315 - 0.472 INCHES 8 - 12MM BY TURNING THE HEXAGON ADAPTER IN THE OIL PUMP, THEN INSTALL THE LEFT SIDE MOUNTING BOLT. INSTALL OR CONNECT THE FOLLOWING. INSTALL BANJO BOLT FOR THE OIL RETURN PIPE FROM THE OIL FILTER AT THE OIL PAN, INSTALL THE POWER STEERING PUMP AND CONNECT THE OIL LINES IF EQUIPPED.INSTALL LOWER OIL PAN, INSTALL THE ENGINE OIL.INSTALL THE NEGATIVE BATTERY.

Yes and no. If the oil pump is going bad the Connecting rods will knock. The Timing chain could be making the sound if the Chain guide came free. My guess is you have a 7 - 70 warranty and they are trying to get out of rebuilding your engine.

This MAY seem Strange But It IS ALL necessary for Oil Pump Replacement. And Please Don't Forget to Rate Me as Most Folks Do Not. Thank You and GOOD LUCK with the Oil Pump Job Also


OIL PUMP
It is necessary to remove the oil pan, oil pickup and chain case cover to service the oil pump rotors. The oil pump pressure relief valve can be serviced by removing the oil pan and oil pickup tube. Refer to Timing Chain Cover Removal and Installation for procedures.

DISASSEMBLY

1. To remove the relief valve, proceed as follows:
2. Drill a 3.175 mm (1/8 inch) hole into the relief valve retainer cap and insert a self-threading sheet metal screw into cap.

1. Clamp screw into a vise and while supporting chain case cover, remove cap by tapping chain case cover using a soft hammer. Discard retainer cap and remove spring and relief valve.
2. Remove oil pump cover screws, and lift off cover.
3. Remove pump rotors.

1. Wash all parts in a suitable solvent and inspect carefully for damage or wear.

Oil Pump Assembly

1. Assemble pump, using new parts as required. Install the inner rotor with chamfer facing the cast iron oil pump cover.
2. Tighten cover screws to 12 Nm (105 inch lbs.).
3. Prime oil pump before installation by filling rotor cavity with engine oil.
4. Install chain case cover. Refer to Timing Chain Cover Installation.

REMOVAL of Timing cover
REMOVAL

1. Disconnect negative cable from battery.
2. Remove timing chain cover.

REMOVAL Of Oil Pan to gain Access to OIL PUMP

1. Disconnect negative cable from battery and remove engine oil dipstick.
2. Raise vehicle on hoist and drain engine oil.
3. Remove bending brace to transaxle attaching bolt.
4. Remove bolts attaching dust cover to transaxle housing. Lower dust cover to gain access to oil pan bolts.
5. Remove oil pan screws and remove oil pan.

INSTALLATION

1. Clean surfaces and apply a 1/8 inch bead of Mopar (R) Silicone Rubber Adhesive Sealant or equivalent, at the parting line of the chain case cover and the rear seal retainer.
   1. Use a new pan gasket.
   2. Install pan and tighten screws to 12 Nm (105 inch lbs.).
   3. Install dust shield and bending brace to transaxle housing.
   4. Lower vehicle and install oil dipstick.
   5. Connect negative cable to battery.
   6. Fill crankcase with oil to proper level.

noise is caused by lack of oil to lifters, or worn timeing chain. if noise is from lifters it should go away wit proper oil level, if still there needs timeing chain.

After these bikes have set for a period of time the oil in the oil tank drains to the lower end of the engine and when started after sitting the oil is usually forced out of the vents for crankcase; which on many of these bikes is through the primary and possibly to the chain oiler etc. Usually after running for a few minutes the oil is back in the oil tank and over supply to the oiler stops! Could possibly soak the clutch plates if it filled primary case also. Be sure and check oil level in tank?! If you added oil before starting it will now be overfilled after starting. This is common problem and will mend it self usually. Does make a mess in the garage toooooooo! Jesse "Leroy" Graves