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CATERHAM Car Parts
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A Caterham Seven is defined by its build record
Similar bodies can cover different chassis generations, engines, gearboxes, rear axle layouts, brakes and suspension. Cars may be factory assembled, owner built, raced or extensively upgraded. Registration year alone is a weak fitment key.
Record chassis and engine numbers, build sheet, gearbox, differential, rear architecture, uprights, hubs, brakes, dampers, springs, wheels and electronics. Treat modifications as part of the current vehicle.
Donor origin is not the finished Caterham specification
Ford, Rover, Suzuki or specialist-supplier origins can help identify a core. Caterham installation may change sump, pickup, mounts, flywheel, cooling, exhaust, bellhousing, pulley or wiring. A production-car service part can still be wrong.
Confirm reference, dimensions, material, rotation and operating range. Photograph adapters, spacers and hose routing so the installation can be reproduced safely.
Create a chassis setup sheet before dismantling
| Record | System resolved | Why it matters |
|---|---|---|
| Chassis/build sheet | Generation and original specification. | Kit and factory cars can differ. |
| Engine/gearbox IDs | Fluids, clutch, mounts and service parts. | Donor origin can be modified. |
| Rear architecture | Live axle, De Dion or independent parts. | Hubs and geometry are unrelated. |
| Brake/pedal data | Calipers, discs, master cylinders and bias. | Partial upgrades alter balance. |
| Ride height/corner weights | Spring and geometry baseline. | Adjustment may hide damage. |
| Wheel/tyre/use | Clearance, temperature and road legality. | Track setup may not suit road use. |
Engine family controls the complete service list
Sigma, Duratec, Rover K-series, Suzuki and other installations require their own oil, filter, ignition, timing, cooling and diagnostic data. Engine capacity or Caterham power designation is not sufficient.
Record management system, induction, injectors or carburettors, cam timing and exhaust. A misfire needs compression, leakage, spark, fuel and air tests before part substitution.
Sump and oil system are critical installation details
Low chassis clearance and sustained cornering can lead to modified wet sumps, baffles or dry-sump systems. Identify tank, pumps, scavenge stages, lines, cooler and level procedure. Dry-sump level can depend on temperature and running state.
More oil is not protection against surge
Overfill can aerate oil or send it through the breather. If pressure falls under braking or cornering, stop testing and inspect pickup, baffling, level process, pump and bearing supply.
Cooling should be tested at road and track airflow
Check radiator size and condition, ducting, fan direction/current, thermostat, pump, cap, hose routing and bleed points. Nose-cone openings and oil coolers can alter airflow. Verify temperature with reliable data.
Use compatible coolant and secure hoses away from belts and exhaust. A hot engine or steam demands shutdown and full cooling before inspection.
Fluids depend on fitted specialist units
| System | Evidence required | Wrong shortcut |
|---|---|---|
| Engine/wet or dry sump | Engine, oil-system design and level state. | Using a generic fill quantity. |
| Gearbox | Exact unit, synchroniser and lubricant. | Selecting by gear count. |
| Differential/axle | Unit, ratio, limited-slip type and oil. | Adding modifier without evidence. |
| Cooling | Engine materials, chemistry and bleed. | Mixing coolants by colour. |
| Brake/clutch hydraulics | Specified fluid, heat duty and seals. | Assuming racing fluid never needs changing. |
| Damper | Manufacturer unit and service specification. | Opening a pressurised unit casually. |
Gear selection faults include the installation
Check pedal travel, cable or hydraulics, release mechanism, clutch, bellhousing alignment, mounts and linkage before blaming the gearbox. Confirm input spline, release geometry and flywheel step during clutch work.
Prop-shaft length, joint phase, balance, flange and operating angle matter in a short driveline. A vibration after ride-height or engine-mount changes may not be a wheel fault.
Rear suspension architecture must be named
Live axle, De Dion and independent layouts use different tubes or axles, links, hubs, bearings, driveshafts and geometry. Identify the exact arrangement and any competition modification.
Inspect radius arms, A-frame or Watts-style locations where fitted, De Dion tube, ears, joints, driveshafts and differential mounts. Cracks or loose joints require the vehicle to remain unloaded.
Front geometry depends on straight wishbones and chassis
Inspect upper and lower arms, ball joints, uprights, steering rack, track ends, dampers, springs and pickup welds. Compare caster/camber hardware and spacer order to the build specification.
Tighten bonded bushes at the required position. Establish ride height and corner weights before final camber and toe, using the intended driver/load state.
Corner weighting is not a substitute for spring condition
Verify identical spring free length/rate where expected, damper function and platform freedom. Excessive platform adjustment can reduce droop, preload a weak spring or create diagonal ride-height errors.
Record every platform measurement and cross weight. Recheck after the springs settle and after any major load or tyre change.
Brake balance involves hydraulics, friction and tyres
Identify disc diameter/thickness, caliper piston areas, pad compound, master-cylinder sizes, pedal ratio and bias mechanism. A larger caliper or different master changes travel and balance.
Use axle-compatible friction, fresh specified fluid and a controlled bedding process. Prove leak-free pedal, wheel release and measured balance before track or fast road use.
Tyres operate within a temperature and legal window
Match size, construction, load/speed rating and wheel width. Competition-focused tyres can offer poor cold or wet behaviour and may lack the markings needed for road use. Check pressures cold and hot for the intended activity.
Inspect age, flat spotting, pickup, cuts and sidewalls. A very light car may not visibly wear a tyre before the compound ages.
Chassis inspection follows every contact event
Inspect tubes, welds, floors, side-impact members, suspension and engine mounts, seat and harness points and roll-over structure. Paint cracking or alignment change can be a structural clue.
Roll-over equipment has an installation standard
A roll bar or cage must match the chassis and intended rules, with correct mounts, fasteners, clearance and padding. Cosmetic resemblance to a competition cage does not establish its material or approval.
Electrical modifications need circuit protection
Battery, master switch, starter, alternator, ECU, pumps and fans need correct grounds, cable size and fusing. Lightweight looms can be damaged by exhaust heat or unsecured edges.
Test voltage drop under cranking and fan load. A larger fuel pump or fan can overload original wiring even when the connector fits.
Fuel systems need secure routing in a narrow chassis
Identify tank, pickup, pump, filter, regulator, rail or carburettors and return/vent arrangement. Use hose and fittings rated for the fuel and pressure, protected from prop shaft, exhaust, sharp aluminium edges and suspension movement. A cabin fuel smell is never an expected Seven characteristic.
After opening the system, prime without uncontrolled cranking and inspect every joint before heat is introduced. Fuel pressure should be measured with suitable secured equipment. Do not compensate for a weak pump or blocked filter by changing mixture or ECU calibration.
Check filler cap sealing and tank ventilation; a blocked vent can starve the engine or distort a lightweight tank. Any wetness requires shutdown, ventilation and removal of ignition sources.
Use fault signals to decide recovery
| Signal | Evidence path | Limit |
|---|---|---|
| Oil pressure falls in corners | Level state, pickup, baffles, pump and supply. | Stop track/road testing. |
| Brake pedal changes | Fluid, heat, leaks, calipers and bearings. | Do not continue. |
| New chassis crack | Impact, fatigue, weld and geometry. | Unload and structurally assess. |
| Prop-shaft vibration | Joints, phase, angle, mounts and flanges. | Avoid speed; recover if severe. |
| Fuel smell | Tank, pump, hoses, rail/carburettor and vent. | Switch off; remove ignition sources. |
| Tyre damage | Heat, pressure, impact and wheel. | Stop before loss of control. |
Close out for the intended road or track use
Label the released wheel torque, cold tyre pressures and suspension settings for the intended activity so a later road or track adjustment does not silently overwrite the safe baseline.
- Record chassis, build and every modified system.
- Capture ride height, weights, geometry and pressure baselines.
- Inspect tubes and mounts before applying setup loads.
- Use verified fluids, parts and locking hardware.
- Restore heat shields, pipe clips and loom support.
- Bleed and pressure-test cooling and hydraulics.
- Set ride height, corner weight and alignment in order.
- Prove brakes and steering at low speed.
- Increase heat and load progressively.
- Recheck fasteners, levels, pressures and structure.
Road legality and competition rules are different
The UK MOT addresses defined roadworthiness items but does not certify track suitability, cage compliance, competition tyre rules or component life. Road noise, emissions, lighting, tyre and registration requirements still apply.
Track organisers and competition authorities can impose separate technical rules. Declare engine, brake, suspension, wheel and structural changes to the insurer.
Practical Caterham parts FAQs
Q: Is registration year enough to identify a Caterham?
A: No. Use chassis and build specification.
Q: Does a Ford or Rover donor part automatically fit?
A: No. Caterham installation can alter it.
Q: Are all Seven rear suspensions the same?
A: No. Live axle, De Dion and independent layouts differ.
Q: Can dry-sump oil be checked cold?
A: Only if the exact system procedure says so.
Q: Does extra oil prevent cornering surge?
A: No. Overfill can create aeration and breathing faults.
Q: Can alignment correct a bent wishbone?
A: No. Replace or repair the cause first.
Q: Does a bigger caliper always improve braking?
A: No. Hydraulic and axle balance must be engineered.
Q: Are track tyres always suitable on wet roads?
A: No. Temperature, tread and legal approval matter.
Q: Can a roll bar be judged by appearance?
A: No. Material, mounts and rules must be verified.
Q: Can a prop vibration be balanced out immediately?
A: Not before joints, phase, angles and mounts are checked.
Q: Should corner weights be recorded?
A: Yes. They make later setup changes traceable.
Q: When should a Caterham be recovered?
A: For brake, steering, structure, pressure, fuel or tyre hazards.
Q: Does an MOT certify track readiness?
A: No. Competition preparation is separate.
