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Products
Inspection of the cylinder heads and valves of John Deere John Deere diesel engine


Detailed Description:

Inspection of the cylinder heads and valves of John Deere John Deere diesel engine

Preliminary Cylinder Head and Valve Checks

Make preliminary inspection of cylinder head and valve

assembly during disassembly.

Look for the following conditions:

Sticking Valves:

Carbon deposits on valve stem.

Worn valve guides.

Scored valve stems.

Warped valve stems.

Misaligned or broken valve springs.

Worn or distorted valve seats.

Insufficient lubrication.

Warped, Worn, or Distorted Valve Guides:

Lack of lubrication.

Cylinder head distortion.

Excessive heat.

Unevenly tightened cylinder head cap screws.

Distorted Cylinder Head and Gasket Leakage:

Loss of cylinder head cap screw torque.

Broken cylinder head cap screw (s).

Overheating from low coolant level operation.

Insufficient liner standout.

Coolant leakage into cylinder causing hydraulic

failure of gasket.

Leaking aftercooler.

Cracked cylinder head.

Cracked cylinder liner.

Damaged or incorrect gasket.

Overpowering or overfueling.

Damaged cylinder head or block surfaces.

Improper surface finish on cylinder head.

Improperly tightened cylinder head cap screws.

Faulty gasket installation (misaligned).

Worn or Broken Valve Seats:

Misaligned valves.

Distorted cylinder head.

Carbon deposits on seats due to incomplete

combustion.

Valve spring tension too weak.

Excessive heat.

Improper valve clearance.

Improper valve timing.

Incorrect valve or seat installed.

Burned, Pitted, Worn, or Broken Valves:

Worn or distorted valve seats.

Loose valve seats.

Worn valve guides.

Insufficient cooling.

Cocked or broken valve springs.

Improper engine operation.

Improper valve train timing.

Faulty valve rotators.

Warped or distorted valve stems.

· "Stretched" valves due to excessive spring tension.

Warped cylinder head.

Bent push rods.

Carbon build-up on valve seats.

Rocker arm failure.

Incorrect valve or seat installed.

Incorrect piston-to-valve clearance.

Improper Valve Clearance:

Inefficient use of fuel.

Engine starts harder.

Maximum engine power will not be achieved.

Shorter service life of valve train.

Greater chance for engine to overheat.

Excessive Recession:

Worn valve guides.

Bent valves.

Debris passed through valve train.

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