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GAS GAS FSE 400/450 : Manuel d'atelier + Chat IA | Fixfr
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User questions

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Patricia C.

What are the valve clearances and main engine tightening torques for an FSE engine?

For an FSE engine, the valve clearances (cold adjustment) and main engine tightening torques are:

  • Valve clearances:
    • Intake valves: 0.15 mm
    • Exhaust valves: 0.25 mm
  • Engine tightening torques (key examples):
    • Engine fastenings (elements A, B, D): 66 Nm (6.6 kgf-m)
    • Engine fastening (element C): 14 Nm (1.4 kgf-m)
    • Cylinder head bolts: Initial 25 Nm / Final 46 Nm
    • Crankcase bolts: 11 Nm (1.1 kgf-m)
    • Alternator rotor nut: 100 Nm (10 kgf-m)
    • Primary drive gear nut: 110 Nm (11 kgf-m)
    • Clutch hub nut: 70 Nm (7 kgf-m)
C S

Patricia C.

What is the tightening torque for the cylinder head cover?

For tightening the cylinder head cover screws, proceed in two steps after lightly screwing them in a diagonal sequence:

  • Initial tightening: 10 Nm (1 kgf-m)
  • Final tightening: 14 Nm (1.4 kgf-m) It is imperative to use new washers and a new rubber gasket during this operation.
C S

Patricia C.

How to identify intake and exhaust valves?

To identify the camshafts and corresponding valves in the FSE engine, refer to the following markings:

  • Exhaust side: Parts are marked 'EX'.
  • Intake side: Parts are marked 'IN'. During maintenance or assembly, it is important not to mix these components.
C S

Patricia C.

How to check and adjust valve clearance?

The procedure for checking and adjusting valve clearance is as follows:

  1. After mounting the camshaft bridges, check the free distance between the camshaft and the upper valve bucket using a feeler gauge.
  2. Reference data:
    • Exhaust valves: 0.25 mm
    • Intake valves: 0.15 mm
  3. If the measured distance does not match these values, replace the adjustment shim with a new shim. Note that when fastening the cylinder head cover screws, the piston must be at top dead center (TDC) of the compression stroke.
C S

Patricia C.

What are the valve clearance values and identification markings for the FSE engine?

Intake valve clearance: 0.15 mm (marked 'IN'). Exhaust valve clearance: 0.25 mm (marked 'EX'). Clearance is checked using a thickness gauge between the camshaft and the valve bucket with the piston at top dead center.

C S

Patricia C.

What are the torque specifications for the FSE engine components?

Cylinder head cover: 10 Nm (initial) to 14 Nm (final) in a diagonal sequence. Cylinder head screws: 25 Nm (initial) to 46 Nm (final). Main engine mounts: 66 Nm. Alternator rotor nut: 100 Nm.

F S

Linda F.

How is valve clearance control performed and what are the reference values?

Valve clearance control is performed by measuring the free distance between the camshaft and the upper valve bucket using a feeler gauge. The reference values are: Intake valves: 0.15 mm, Exhaust valves: 0.25 mm. If the measured distance does not match these values, the adjustment shim should be replaced with a new one.

F S

Linda F.

What is the brand of the engine and its electronic fuel injection system?

The manual concerns Gas Gas FSE 400 / 450 engines (2002-2003 models). The electronic fuel injection (E.F.I.) system is supplied by Magneti Marelli.

F S

Linda F.

How is valve clearance checked on an FSE 400 / 450 engine?

Valve clearance is checked by measuring the free distance between the camshaft and the upper valve bucket using a feeler gauge. Reference values are 0.15 mm for intake valves and 0.25 mm for exhaust valves. If the measured distance does not match, the shim must be replaced.

F S

Linda F.

What is the manufacturer of the Gas Gas FSE 400 / 450 engine?

The manual concerns Gas Gas FSE 400 / 450 engines. The electronic fuel injection system is manufactured by Magneti Marelli, but no other brand is mentioned as the manufacturer of the engine block itself.

F S

Linda F.

How to check valve clearance for Gas Gas FSE 400 / 450 engines?

Valve clearance is checked by measuring the free distance between the camshaft and the upper valve bucket using a feeler gauge. Reference values are: Intake valves: 0.15 mm; Exhaust valves: 0.25 mm. If the measured distance does not match these values, the adjustment shim must be replaced with a new one.

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