153 Products
INTERMOTOR Car Parts
Intermotor supplies ignition, engine-management, emissions and fuelling components, but this particular range has a much tighter focus. Most items are for conventional distributor ignition: distributor caps, rotor arms, contact-breaker sets and ignition condensers, with a small number of HT lead sets and individual sensors or switches. It is therefore especially relevant to older vehicles where mechanical condition, distributor type and correct adjustment matter as much as the nominal vehicle application.
Identify the existing system before ordering. Record the vehicle, engine code, build date and distributor manufacturer or identification marks, then compare the Intermotor part number and any restrictions shown for the listing. Bosch, Lucas, Ducellier, Marelli, Delco and other distributor families can use parts that look broadly alike but differ in mounting, terminal layout, shaft fit, rotation, contact geometry or condenser lead. A cap and rotor should be considered as a matched interface within the distributor, not selected independently by colour or outside diameter.
Diagnosis comes before replacement. Misfire, difficult starting and poor running can arise from plugs, leads, coil supply, dwell, timing, fuel mixture, compression or air leaks as well as cap, rotor, points or condenser faults. Inspect for tracking lines, cracks, burnt terminals, excessive shaft play, poor earths, loose low-tension connections and oil or moisture inside the distributor. HT leads should be checked for correct routing, secure boots, heat damage and resistance where the vehicle procedure specifies it.
Work with the ignition isolated and remember that secondary ignition voltage can injure even on a nominal 12V vehicle. After fitting contact points, set gap or dwell by the vehicle procedure, then verify ignition timing because changing dwell can alter the firing point. Keep leads in the correct firing order and clear of exhaust heat, belts and sharp edges. A sound ignition system also supports stable combustion and emissions performance, but fitting a new component is not itself proof of an MOT pass. Confirm starting, idle, advance operation and road behaviour before returning the vehicle to use.
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Intermotor parts for distributor ignition and engine signals
Intermotor's wider official range spans ignition, engine management, emissions and fuelling. The 153 products represented here are much more concentrated: 52 distributor caps, 44 rotor arms, 26 ignition condensers and 24 contact-breaker sets account for nearly all of the selection. Three ignition lead sets and a handful of sensors or switches complete it.
This mix calls for component identification rather than broad assumptions about brand coverage. Conventional distributors combine several interfaces in a small assembly: cap location, rotor height and shaft fit, terminal positions, points geometry, condenser connection and the distributor's own advance mechanism. A change to one item can expose wear or incorrect setup elsewhere.
Understand the represented range
| Part group | Function | Identity checks | Typical inspection clues |
|---|---|---|---|
| Distributor cap | Routes coil high voltage to each cylinder terminal | Distributor make, fixing style, terminal count and pattern, coil connection and venting | Cracks, carbon tracks, moisture, corrosion, burnt posts and poor seating |
| Rotor arm | Transfers voltage from the cap centre to successive terminals | Shaft profile, key or clip, height, sweep, rotation and cap pairing | Burnt tip, looseness, tracking, internal breakdown and contact marks |
| Contact-breaker set | Switches the coil primary circuit at the required distributor angle | Distributor family, pivot and heel form, terminal location and ventilation detail | Pitting, transfer, contamination, weak spring, worn heel and unstable dwell |
| Ignition condenser | Works with breaker points to control primary-circuit switching | Capacitance/application reference, mounting, lead length, terminal and earth path | Heavy point arcing, rapid transfer, intermittent misfire or short/open circuit |
| Ignition lead set | Carries high voltage to spark plugs on distributor or remote-coil systems | Engine, lead lengths, core technology, boot styles, terminals and firing order | Cracks, burns, high resistance, loose ends, arcing and incorrect routing |
| Sensor or switch | Reports temperature, oxygen or another state, or switches a circuit | Connector, thread, calibration/application, lead count and installation position | Wiring damage, contamination, implausible live data and circuit faults |
Confirming distributor identity
Start with any maker's plate, stamped number or casting reference on the distributor. Vehicle model and year are useful, but distributors may have been changed during decades of service. The represented Intermotor listings include manufacturer restrictions naming several distinct distributor makers, which is strong evidence that physical similarity alone is unsafe.
Before removing leads, photograph the cap and label each position if the firing order is not already documented. Note the cap's locating feature and the rotor direction. Compare mounting clips or screws, centre contact, side or top entry terminals, coil-lead arrangement and any vent. If the old cap has been forced to seat or shows offset rotor marks, establish why rather than copying the fault.
| Evidence | Useful for | Limitation |
|---|---|---|
| Vehicle registration or chassis data | Narrowing engine and production specification | May not reveal a distributor replaced in later service |
| Engine code | Separating ignition systems used in the same model | More than one distributor supplier may still have been fitted |
| Distributor number | Identifying the actual assembly on the engine | Must be read accurately and cross-referenced to the selected part |
| Old component dimensions | Confirming shaft, mounting and terminal geometry | A worn or incorrect old part should not become the sole authority |
| Intermotor part reference | Checking the published application and restrictions | Every note, date split and supplementary detail still needs review |
Distributor caps and rotor arms
Inside the cap, examine the central carbon contact, cylinder posts and moulded insulation. A fine dark track can provide an unintended route for high voltage, especially when damp. Green corrosion raises resistance; heavy erosion may indicate excessive service time, a lead fault or abnormal rotor alignment. Cleaning can help diagnosis, but a cracked or deeply tracked cap should not be trusted.
Check rotor fit on a clean shaft. It should locate exactly as intended without filing, packing or adhesive. Compare overall height and tip sweep with dependable specifications because a rotor that sits too high or low can contact the cap or create an excessive gap. Look for distributor-shaft side play and verify the advance mechanism moves and returns according to its design.
When fitting, transfer one HT lead at a time if labels are uncertain. Ensure the cap sits on its locator before fastening clips or screws. Boots must be fully home, but pushing on the cable rather than the boot can damage the conductor-terminal connection.
Contact points, gap and dwell
Contact-breaker points need clean mounting, a sound low-tension connection and the specified rubbing-block lubrication, if required. Keep grease away from the faces. Set the initial gap on the correct distributor-cam position using the vehicle data, then use dwell measurement where the procedure calls for it. Distributor shaft wear can make the gap vary between lobes, so compare readings rather than assuming one lobe represents all cylinders.
Point faces provide diagnostic information. A small, even wear pattern is different from severe pitting, blue heat marks or material transfer to one contact. Such signs can reflect condenser trouble, excessive primary current, poor connections or an unsuitable coil/ballast arrangement. Replacing points without finding the cause can produce a short-lived improvement.
Changing the point gap changes dwell and can shift ignition timing. Set the points first, refit the cap securely, then check base timing and advance by the vehicle manufacturer's method. Do not rotate a running distributor with loose clothing, leads or tools near belts and fans.
Condensers and low-tension connections
The condenser is electrically small but application-sensitive. Its case usually depends on a clean, secure earth through the mounting, while the lead and terminal must avoid moving parts inside the distributor. Compare fixing method, lead length and connector as well as the Intermotor reference. Do not trap insulation beneath a terminal or allow the lead to be rubbed by the points plate.
A condenser can fail open, short or intermittently, and some symptoms overlap with coil, wiring and point faults. Use the relevant test procedure and inspect primary voltage, earths and ballast operation before condemning it. Never hold a lead or cap terminal to check for spark by hand; use suitable test equipment with the ignition system controlled safely.
Ignition lead sets and suppression
Intermotor's official ignition-lead information describes copper, resistive and inductive wire-wound technologies, silicone insulation and engine-specific boot styles. This is why length alone does not select a lead set. The correct arrangement must match the coil or distributor terminal, spark-plug end, cable route and suppression design required by the vehicle.
| Lead check | Method | Interpretation caution |
|---|---|---|
| Routing and order | Compare cylinder sequence and clips with the engine diagram | Two crossed leads may allow cranking yet cause backfire or non-start |
| Boot seating | Feel for full engagement at cap, coil and plug ends | A loose terminal can hide beneath an apparently seated rubber boot |
| External condition | Inspect for cuts, burns, oil contamination and abrasion | Internal failure may exist without visible jacket damage |
| Resistance | Measure only against the correct lead technology and vehicle data | Different conductor designs do not share one universal acceptable value |
| Arcing test | Use approved diagnostic equipment and safe workshop conditions | Spraying liquids or touching live HT components creates avoidable risk |
Route leads through their separators to reduce chafing and cross-fire, keeping them away from exhaust manifolds and sharp edges. Pull boots with an appropriate method rather than tugging the cable. If one lead has failed through age, inspect the complete set and the cap terminals it connects to.
Sensors and the outlying Intermotor items
A few products here fall outside classic ignition, including oxygen, coolant-temperature and exhaust-temperature sensors plus a reverse-light switch. These must be selected by their exact circuit and application. Match thread, connector, lead arrangement and calibration; do not infer interchangeability because two sensors fit the same spanner.
Diagnose the circuit before fitting. Check supply or reference voltage, earth, wiring integrity and plausible live values where suitable equipment is available. An oxygen-sensor code can be caused by mixture, air leaks, exhaust leaks or wiring. An exhaust-temperature fault may involve heat-damaged harnesses. Replacement should follow evidence, not the wording of a fault code alone.
Ignition faults, emissions and MOT considerations
Use a sequence: verify battery cranking condition, then spark, fuel and mechanical integrity. Within ignition, check primary feed and switching, coil output, cap and rotor condition, lead routing, plug state, dwell and timing. This avoids replacing several Intermotor parts when one connection or mechanical distributor fault is responsible.
DVSA's MOT manual includes exhaust-emissions testing and, for applicable vehicles, checks of the engine malfunction indicator. A misfire can raise emissions and damage a catalytic converter, so persistent poor running should be corrected before road use. Older vehicles may be tested under different age-related rules, but that does not remove the duty to keep them safe and roadworthy.
Frequent Intermotor selection and fitting errors
- Identifying a cap only by the vehicle badge instead of the distributor fitted.
- Choosing a rotor by shaft appearance without checking its height and sweep.
- Moving all HT leads at once and losing the firing order.
- Setting point gap but omitting the subsequent dwell and timing checks.
- Allowing grease, fingerprints or abrasive residue onto contact faces.
- Replacing a condenser repeatedly without testing primary current and earth quality.
- Pulling an ignition lead by its cable and weakening the terminal joint.
- Assuming a diagnostic trouble code proves that the named sensor has failed.
Intermotor questions and answers
Q: Which Intermotor products dominate this collection?
A: Distributor caps, rotor arms, condensers and contact-breaker sets make up almost all of the represented selection.
Q: Why is the distributor number important?
A: A vehicle application may include several distributor makes whose caps, points and rotors are not interchangeable.
Q: Should I replace cap and rotor together?
A: Inspect both as a working pair; replacement decisions should reflect condition, compatibility and the vehicle service procedure.
Q: What causes a visible track inside a distributor cap?
A: High voltage can follow contamination or damaged insulation, leaving a carbon path that encourages repeat misfire.
Q: Is point gap the same as dwell?
A: They describe related settings differently; use the specified setup method and verify timing after adjustment.
Q: Can a bad condenser damage new points?
A: Incorrect condenser operation can contribute to heavy arcing and material transfer, so abnormal point wear needs diagnosis.
Q: Are all Intermotor ignition leads copper core?
A: No. Official range information identifies copper, resistive and inductive wire-wound technologies, depending on the application.
Q: May I test an HT lead by holding it near earth?
A: No. Secondary ignition voltage is hazardous; use suitable controlled test equipment and an established diagnostic procedure.
Q: Why did timing change after fitting points?
A: Altering breaker gap changes the switching angle and can move the effective ignition timing.
Q: Does a misfire always mean distributor parts are worn?
A: No. Plugs, coil supply, leads, mixture, compression, timing and air leaks can produce overlapping symptoms.
Q: How should plug leads be removed?
A: Grip and release the boot using an appropriate method, rather than pulling on the insulated cable.
Q: Will a new sensor clear an MOT-related warning automatically?
A: Only a correctly diagnosed and repaired system will extinguish a valid fault indication and restore proper operation.