Straight, in-order procedure with theory and fault‑fix explanation. Read the whole list first, then follow the steps.

Important preliminary: identify the exact engine and adjuster type (screw‑and‑locknut rocker or shim‑under-bucket). Get the OEM valve lash and locknut torque specs for your MF3505/3525/3545 (the procedure below is generic; typical small diesel cold clearances are ~intake 0.15 mm, exhaust 0.20–0.25 mm — confirm in the manual). Always work on a cold engine unless the manual specifies otherwise. Safety: engine off, key out, parking brake on, disconnect battery if you’ll be working near electrics.

Theory summary (short)
- Valve lash = clearance between valve mechanism and valve stem/rocker when valve is fully closed (engine cold). It compensates for thermal expansion so valves fully seat at operating temperature.
- Too small lash (tight valves) means valves begin to be held slightly open at operating temp -> loss of compression, poor sealing, hard starting, burnt valve face/seat, white/poor combustion, low power.
- Too large lash (excessive gap) produces noisy tappets, reduced valve lift/duration (because of lost motion at the start of opening), poor breathing and power, and accelerated wear at pushrods/rockers.
- Adjustment restores correct contact geometry so valve timing, lift and seat sealing occur as designed → restores compression, combustion and noise levels.

Ordered procedure (step numbers = order to perform)

1) Prepare
- Park tractor level, cool engine, remove air cleaner parts obstructing access.
- Gather tools: metric sockets/wrenches, screwdriver, feeler gauges, long breaker bar/ratchet for crank rotation, torque wrench, rag, penetrating oil, service manual with clearances and torques.

2) Remove valve cover and clean area
- Remove fasteners, lift valve cover. Clean rockers/valve area so dirt doesn’t enter when cover is off.
- Visually inspect for broken springs, sludge, excessive wear or oil starvation before adjusting.

3) Identify adjuster type
- Screw‑and‑locknut: visible adjuster screw and locknut on each rocker.
- Shim‑under‑bucket: no adjuster screw; a shim sits under the bucket/rocker cap. Procedure differs (see step 9).

4) Set engine to correct position for a cylinder (base circle/TDC on compression)
- You must measure with the valve on its base circle (both inlet and exhaust valves closed).
- Rotate the crankshaft slowly to the cylinder’s TDC on the compression stroke OR rotate until the rocker(s) for that cylinder have maximum free play / are not moving when you turn the engine — that indicates the cam lobe is away from the tappet (base circle).
- Use timing marks on crank pulley or flywheel if available; confirm by observing that both intake and exhaust rockers for that cylinder are loose.

Theory: measuring at the base circle ensures the cam lobe isn’t lifting the valve; lash measurement is the gap when valve is closed.

5) Measure clearance with a feeler gauge
- Insert the correct feeler gauge between the rocker (or adjusting screw head) and the valve stem/ tappet as specified.
- A correct feeler should pass with light friction. If it’s too tight or loose, you need to adjust.

Theory: feeler gauge gives the exact air gap that must exist to allow thermal expansion while ensuring full valve closure at operating temp.

6) Adjust screw‑and‑locknut rocker (if applicable)
- Loosen locknut while holding the adjusting screw.
- Turn the adjusting screw until the selected feeler barely drags when you slide it.
- Hold the screw in position and re‑tighten the locknut to specified torque (or firm snug if torque unknown, then check and correct clearance after nut tight).
- Recheck clearance after tightening (tightening the locknut sometimes moves the screw).
- Repeat for each valve, moving the crank to the next cylinder’s base circle for that valve.

Theory: the screw changes the effective length between rocker pivot and valve stem contact so you set the precise gap.

7) Reassembly for screw type
- After all valves checked and adjusted, rotate engine two full revolutions and recheck all clearances once more to ensure nothing moved.
- Replace valve cover with new gasket if required and torque cover bolts per spec.

8) Test run and verification
- Start engine and listen: noisy ticking should be reduced. Let engine reach operating temperature and check for abnormal smoke or rough running.
- After a short run, recheck clearances if the manual recommends checking warm/cold recheck (some engines call for cold initial check only).

How this repair fixes common faults (concise)
- Noisy ticking: large clearances allow immediate gap impact when rocker/valve begins to move. Reducing lash to spec restores continuous contact and removes impact noise.
- Loss of power/rough running/hard starting: valves too tight prevent full seating at operating temp (valves don’t seal), causing loss of compression and poor combustion. Increasing clearance to spec ensures full closure at temp so compression and combustion are restored.
- Excessive oil burning or white smoke: improperly seated valves (from wrong lash) can cause poor combustion or allow oil into combustion chamber; correct lash restores sealing.
- Accelerated wear: incorrect lash causes pounding or chattering that accelerates wear of rockers, valve stems, seats; correct clearance restores smooth contact and designed load distribution.

Special note — shim‑under‑bucket engines
- Remove rocker assembly or bucket to measure current shim and clearance.
- Measure actual clearance (or shim thickness and actual gap), then compute replacement shim thickness:
new_shim = old_shim + (measured_clearance − desired_clearance)
- Replace shim with nearest available thickness, reassemble, and recheck.
Theory: shims change valve seating position by changing the effective length from cam to valve; same principle as screw adjuster but by changing shim thickness.

Common troubleshooting after adjustment
- If a valve cannot be adjusted to spec (e.g., even at smallest screw setting or no appropriate shim), inspect for valve-seat recession, bent valve, worn tappet or incorrect cam lobe height.
- If repeated rapid loosening of locknuts occurs, use thread locker per manual and verify nut torque.

Final warnings and best practice
- Always use OEM clearances and torque specs.
- Adjust cold unless manual says hot.
- Work methodically and recheck after two crank revolutions.
- If unsure about shim selection or symptoms persist after correct lash, the valve, seat, or head may need machine work.

End.
rteeqp73

Massey Ferguson 1984 Model Year 3500 Series Tractors - Competitive Comparison 3505 3525 3545 Educational fun historic video for entertainment.

Massey Ferguson Instructional Sales Video This is a video my grandfather had with his 4WD Massey Ferguson 3545, probably my favorite tractor he had. We used in the ...

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