Camshaft. Porsche 993 C2 / C4 / C2S / C4S  ›  99310524

OE Match camshaft for selected Porsche 993 C2, C4, C2S and C4S applications. The supplied references identify separate left- and right-hand versions, so confirm the required position and engine specification.

Fits

Porsche 993 C2 / C4 1996-98
with engine: 6421, 6422, 6423, 6424

The vehicle listings above must be checked alongside the engine-specific application and required camshaft reference.

Check fitment for your specific vehicle (model, year, engine) before ordering.

Diagram reference no 23

What This Product Does

The camshaft operates the valve train, determining when valves open and close and how far they move. Its lobe profile controls valve movement in relation to engine rotation. Correct selection is therefore important during cylinder-head repairs or an engine rebuild.

Functions

• Controls valve opening and closing events.
• Determines valve lift and opening duration.
• Coordinates valve operation with the engine cycle.
  
  

Technical Details

• Brand: OE Match.
• Left-hand camshaft reference: 99310524715; shown in valve control diagram 103-10, item 33.
• Right-hand camshaft reference: 99310524614; shown in valve control diagram 103-15, item 24.
• Diagram engine designations: M64.21/22 and M64.23/24.
• Supplied engine identifiers: 6421, 6422, 6423, 6424.
• Left and right valve-control diagrams cover Porsche 993 applications from 1994–98.
  
  

Symptoms of Fault

• Tapping or ticking around the valve train.
• Irregular idle, misfiring or uneven engine operation.
• Reduced engine output associated with valve-actuation problems.
• Pitted, scored or visibly worn cam lobes.
• Unusual wear on the contacting rocker or follower surfaces.
• Metal particles discovered during oil or filter inspection.
  
  

These signs are not conclusive evidence of camshaft failure. Inspect the valve train and lubrication system before selecting replacement components.

Why Replacement Matters

A damaged lobe can prevent the intended valve movement. Replacement may be appropriate where inspection confirms wear, pitting or scoring. Establish whether inadequate lubrication or contaminated oil contributed to the damage, and assess contacting components before reassembly. During a rebuild, inspect associated seals, timing components and fixings rather than assuming they remain serviceable.

FAQs

Which reference identifies each side?
The supplied diagrams associate 99310524715 with the left-hand assembly and 99310524614 with the right-hand assembly.

Should the rockers or followers be inspected?
Yes. Worn contact surfaces can affect a replacement camshaft; assess them during dismantling.

Can lubrication problems damage a camshaft?
Insufficient oil supply or abrasive contamination can contribute to surface deterioration. Investigate the cause alongside the visible damage.