1) Quick function summary
- Rocker arms transmit cam-lobe motion to open valves, pivoting on a shaft or individual studs and pushing valve stems (direct or via pushrods). Correct clearance (lash) between rocker and valve stem lets the valve fully close when the cam lobe heel/base circle is under the rocker; oiling and correct geometry provide full valve lift and timing.

2) Safety and prep
- Cool engine, disconnect battery, clean area, remove air intakes as needed, remove valve/rocker cover and gasket. Have feeler gauges, appropriate spanners/screwdrivers, torque wrench, rags, marker, replacement rockers/shafts if required.
- Theory: cleanliness prevents debris entering the head; cool metal gives repeatable clearances.

3) Identify TDC (compression stroke) for the cylinder you will adjust
- Rotate engine by hand at the crank until the cam lifter/pushrod for that cylinder is on the cam base circle (both valves indicated as closed). Use timing marks or feel compression through fuel pump lever/spark plug hole. For each cylinder adjust with its cam lobe on the base circle.
- Theory: lash is set with cam lobe on base circle so the rocker sits on the lobe heel and not forcing the valve partly open; otherwise clearance reading is wrong.

4) Inspect rockers, shaft, pushrods before adjustment
- Visually and by feel check rockers for excessive wear, flat spots, pitting on contact faces, shaft scoring or play, bent/splayed pushrods, and that oil holes are clear.
- Theory: worn contact faces or bent pushrods change effective valve geometry; adjustment alone won’t restore correct valve seating or lift if components are worn.

5) Measure and adjust valve clearance (orderly procedure)
- For each cylinder at TDC compression:
a) Place appropriate feeler gauge between rocker pad and valve stem/top of tappet.
b) If rocker uses an adjusting screw and locknut: loosen locknut, turn adjuster until the correct feeler gauge slides in with a slight drag, hold the adjuster and tighten locknut while keeping the adjuster from moving, recheck clearance.
c) If rockers are on a shaft with shims: measure clearance; replace or reposition shims / swap rocker thickness per manual to obtain correct lash.
- Theory: correct lash compensates for thermal expansion and wear so valves close fully at operating temp and open for the intended duration. Too tight = valve open at rest → burning/poor compression. Too loose = delayed/insufficient lift → noise, poor breathing, loss of power.
- Typical small Perkins diesel guidance (verify with Perkins manual for 3.152): cold clearances often around 0.20 mm (0.008") intake and 0.30 mm (0.012") exhaust. Confirm exact spec for your engine and use metric gauges.

6) Sequence and repeat
- Adjust each cylinder in turn: bring each to TDC compression and repeat the measure/adjust. On a 3‑cylinder do one cylinder at a time; you must rotate the engine to get each cylinder’s cam on the base circle.
- Theory: each cam lobe is phased differently; you must measure when that lobe is on the base circle for that cylinder.

7) Replace worn components when necessary
- If rockers/shaft/pivots are scored, worn beyond limits, or oil galleries clogged, replace or refurbish. When replacing, transfer oil passages, use new gaskets, ensure correct orientation and torque of shaft bolts, and preload any shims per spec.
- Theory: replacing worn parts restores correct rocker geometry and oil flow. Worn rockers/shafts reduce effective lift and change lash; replacement returns the valve timing/lift to design values and ensures lubrication to avoid rapid recurrence.

8) Reassembly and check
- Refit valve cover with new gasket, reconnect battery/air intakes. Start engine, listen for abnormal noise, allow to idle and reach operating temperature, then shut down and recheck clearances cold (some manufacturers recommend a second check after initial run).
- Theory: thermal expansion can change clearances; a recheck ensures the setting was stable and that locknuts didn’t creep.

9) How the repair fixes common faults (concise mapping)
- Excess lash (too loose): causes metallic ticking, reduced effective valve lift→ loss of power and rough running. Adjustment closes lash to spec, restoring lift and timing.
- Insufficient lash (too tight): valve partially open at rest → poor compression, overheating/burnt valve faces, white smoke. Adding correct lash restores valve seating, compression, and prevents burning.
- Worn rocker faces/shaft: reduces lift and causes uneven wear/noise. Replacing worn parts restores geometry and oiling, stopping loss of power and loud knock.
- Oiling faults: blocked oil passages/starved rockers cause wear/knock. Cleaning/restoring oil feed prevents recurrence.

10) Notes and maintenance
- Always use the exact Perkins 3.152 valve clearance and torque specs from the official manual. Recheck clearances after first few hours of operation. Keep valve-cover gasket and breather system sound to maintain oil cleanliness.
- Common torque/clearance values vary by version — verify before final tightening.

End.
rteeqp73

Perkins 3.152 After Cylinder Head Rebuild 3

Machining and Rebuilding A 152 Cubic Inch Perkins Diesel Engine In Under 20 Mins? Okay, maybe it took more than 20 minutes... But I can show you in less than 20 minutes! This quick video shows the machine work ...

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