YOUR 1975 MIDGET / WORKSHOP
Open the bonnet.
Know what to do.
Practical jobs for the car in your photographs. Each guide puts the part, the sequence, the final check, and the factory source in one place.
Find your next step Find a part in your photos ↗Plan a project ↗Study handbrake connections · estimated geometry, no verified service path ↗
YOUR ENGINE BAY · IMG_6856This is a North American 1975 Midget 1500 guide. The factory specification identifies a single Zenith-Stromberg 150 CD4 carburetor. The photographed car has a red rocker cover, a likely rear heater box, and orange ignition leads. The exact engine and emissions variant still needs confirmation from its identification plates. The manual’s UK twin-carb pages do not describe this intake setup.
Factory US specification, PDF p. 17 ↗
Inspect the fan first.
Several blade tips in your supplied close-ups look chipped or fractured. The photos cannot establish the condition of every blade or what is fitted today. With the engine cold and unable to start, inspect and photograph the full fan. Keep the engine off until the finding is resolved; replace a fan with any cracked, loose or missing blade material before running.
Record blade count and molded markings before ordering. The Rimmer North American 1500 listing identifies RKC92 as a 13-blade plastic fan; that listing does not identify the unit on this car.
What are you working on?
Checkmarks are a dated work session, saved in this browser. Use “Start new run” when repeating a check. An old check does not describe the car’s condition today.
Find it in the bay.
Tap a numbered marker to jump to a guide. This photo fixes the visible positions; the dipstick and sump drain remain unmarked; IMG_6966 identifies the blue spin-on filter as ACDelco PF53, while its adapter remains unverified.
- 1 · Oil filler capThe black cap at the top of the red rocker cover. The dipstick is a separate handle lower on the engine.
- 2 · Rocker coverRemove this cover only for the valve-clearance job.
- 3 · AlternatorThe silver unit at the lower right of this photograph; the belt is clearer in the close-up below.
Decide what needs attention first
Use this as an evidence log after a long lay-up or unknown service history. Checking a step means you recorded an observation, not that the system passed or the car is roadworthy.
Have ready
Phone or camera · torch · tyre-pressure gauge · notepad or project planner · factory manual. Park level with the key out and engine completely cold. Record date and odometer reading.
For each system: record “No issue observed,” “Needs attention,” or “Unverified,” with a photograph or measurement. Leave any system you cannot check as unverified.
Photo cue: several fan tips in IMG_6850 look chipped or fractured. Keep the engine off until all blades have been inspected cold with the key out; the photo does not establish the condition today.
Condition worksheet
Record what you can verify today. “No issue observed” means only that this inspection found none; leave inaccessible or uncertain systems unverified. The report stays in this browser until you download it.
Brakes, tyres, steering, fuel containment or cooling have known faults or cannot be judged safely. A completed checklist is a record of this inspection; it is not clearance to drive. Get a qualified inspection for systems you cannot verify.
Survey the car first
A one-pass record of the car’s condition before ordering parts or choosing a first drive. The factory 1975–76 US summary calls for weekly checks of fluids, tyres, lights, horn and wipers.
Have ready
Phone or camera · notepad or project planner · torch · tyre-pressure gauge. Work on level ground with the engine off and fully cool.
Record before changing anything: odometer reading, date, identification plates, fluid levels, leak locations, belt condition and any nonstandard parts.
You have dated photos, plate transcriptions, a recorded odometer reading, fluid and tyre observations, and a short list of projects with a clear next action. Unknown service history remains unknown until supported by records or completed work.
Identify the car and fitted engine
Find three different numbers before a variant-specific parts order. The catalog illustration locates the chassis plate, the 1500 engine-number flange and the separate body plate. An engine may have been changed since the car was built.
Have ready
Phone or camera · torch · clean dry cloth · car record. Park securely with the key out and engine cold. Do not scrape, repaint or remove an identification plate to read it.
Record exactly: photograph the whole plate or stamping and its surrounding bodywork, then copy every legible character. Mark an unreadable character with “?” instead of guessing.
The chassis, engine and body identifiers have separate photographs and transcriptions, or a clear “not found / unreadable” result. Use the observed number and fitted component, not model-year assumptions, for fitment decisions.
Inspect tyres and wheels
The factory U.S. schedule calls for tyre pressure, tread and damage checks. Inspect all four road tyres and the spare.
Have ready
Phone or camera, torch, tyre-pressure gauge and notepad. Park level with the key out. Do not loosen a wheel for this visual pass.
Record a result: date, odometer, observations and photos or measurements. A checked step means observed, not passed.
Do not drive with a bulge, exposed cord, significant damage, unexplained pressure loss or uncertain wheel security.
Inspect brake and clutch hydraulics
The factory U.S. schedule covers fluid, pipes, hoses, linings, drums and discs. Begin with observations that do not require dismantling.
Have ready
Phone or camera, torch and clean rag. Park level with key out. Keep hydraulic fluid off paint; identify each reservoir before opening or adding anything.
Record a result: date, odometer, observations and photos or measurements. A checked step means observed, not passed.
No road test with any brake leak, sinking pedal or uncertain brake condition. Inspect and repair the complete system first.
Inspect the visible fuel path
Trace accessible lines toward the fitted carburetor and the electric pump shown in IMG_6898. Record containment; the tank and hidden sections still need inspection.
Have ready
Phone or camera and torch. Engine off and cold, key out, no smoking or sparks. Do not disconnect a line, energize the pump or start with suspected leakage.
Record a result: date, odometer, observations and photos or measurements. A checked step means observed, not passed.
Do not switch on the ignition or run the engine with a suspected fuel leak. Identify and correct the source first.
Inspect steering and suspension
The factory safety schedule calls for steering and suspension security, joints and gaiters. Record visible condition and symptoms before a drive.
Have ready
Phone or camera, torch and helper if available. Park level with key out. Do not work beneath an unsupported car.
Record a result: date, odometer, observations and photos or measurements. A checked step means observed, not passed.
Postpone driving if steering binds, components appear damaged or loose, or security cannot be established.
Check lights, horn, wipers and battery
The factory U.S. weekly list calls for all lights, horn and wipers. Record individual functions and failures.
Have ready
Phone or camera, helper and suitably wet windscreen. Keep the car parked. Leave engine-running and charging checks until the fan issue is resolved.
Record a result: date, odometer, observations and photos or measurements. A checked step means observed, not passed.
Resolve failed essential lamps, horn or wipers before road use. A parked test does not prove charging-system condition.
Check engine oil
Use the dipstick’s own MIN and MAX marks. The factory US schedule calls for this check weekly.
Have ready
Clean lint-free rag · correct engine oil if top-up is needed · level parking spot.
Find the parts: marker 1 is the cap position on the red rocker cover in IMG_6856. IMG_6893 shows a different-looking cap at that position stamped “CAUTION REMOVE SLOWLY”; identify its underside and the neck before treating it as the correct oil filler. The dipstick is separate from the filler cap. The 1500 parts list, printed page 127 names a separate tube (121831), dipstick (134933) and felt washer (032307). The factory U.K.-specification oil-level drawing (PDF p. 30) points to a looped handle low beside the front half of the engine, on the side opposite the alternator in its overhead view. A 1979 Midget engine-out photograph shows a similar loop near the front of the manifold/core-plug side. These are search landmarks for the 1500 family; neither verifies the exact position or fitted tube on this 1975 car. Look below the front of the intake manifold and alongside the block, then trace any candidate handle to a tube entering the engine before pulling it. IMG_6885 and IMG_6898 do not establish its position. Compare the fitted-cap evidence ↗
The level is between the marks and both cap and dipstick are seated. If the level repeatedly falls, find the leak or consumption cause before relying on top-ups.
Change oil & filter
The factory capacity for the sump including filter is approximately 4.5 litres / 9.6 US pints. Use the dipstick as the final fill check, not the nominal capacity alone.
Have ready
Oil matching the factory viscosity chart for your climate · verified replacement spin-on cartridge and seal · drain pan holding more than 4.5 L · suitable drain-plug tool · clean rag · safe means of accessing the sump · disposal container.
Stop point: identify the actual drain plug and filter on your car before loosening anything. IMG_6966 reads ACDelco PF53 on the fitted filter. Its adapter, thread and gasket seat are hidden; the sump drain is still unmarked. Check the PF53 fitment record before buying a replacement. Confirm both on the car before loosening anything. Also resolve the possible fan-blade damage before starting the engine for this job. If the fan is damaged, do not run it just to warm the oil.
The filter and plug are dry, the oil level is correct after settling, and used oil and filter are ready for proper recycling. Recheck for leaks after the next drive.
Check the fan belt
The available factory scan conflicts on belt deflection: its general specification says ½ in / 13 mm, while its UK maintenance method says ¾ in / 19 mm. Confirm the procedure for this 1975 US car before setting tension.
Have ready
Ruler · appropriate wrenches for the fitted alternator brackets · light source. Engine off and cool; keep fingers clear of the fan.
The belt is undamaged, its measured movement matches a verified procedure for this car, and the alternator is secure. Do not overtighten: excessive tension loads the water-pump and alternator bearings.
Plan an alternator replacement
Use this to identify the actual unit and prove there is a removal path. The 3D parts show comparison dimensions and estimated mounting stations; they do not establish clearance on your car. The period North American catalog also lists a second bracket and different pivot hardware that the CAD has not reconstructed.
Have ready
Light · phone camera · ruler or caliper · labels for wires and hardware · the correct factory manual for your car. Work with the engine off and cool. Disconnect the battery negative lead before handling alternator wiring.
You have the fitted unit number, both mounting dimensions, pulley alignment, wiring record, hardware order and a measured bolt-withdrawal path. If any are missing, keep the project in the evidence-gathering stage.
Set valve clearances
The factory cold clearance is 0.010 in / 0.25 mm. Count valves from the front of the engine and use the pair sequence below.
Have ready
0.010 in feeler gauge · wrenches for rocker-cover nuts and adjuster locknuts · screwdriver for the adjusters · means of turning the engine by hand · replacement rocker-cover gasket if needed.
Before removing the cover: record where the ignition leads and hoses run in your own photos. Turn the engine only by a safe manual method, with the ignition disabled and transmission in neutral; keep clear of moving belts and fan.
Each valve measures 0.010 in cold after its locknut is tightened, the cover seal sits evenly, and no oil leaks appear after running the engine.
Inspect and renew spark plugs
The factory 1975 U.S. specification lists Champion N-12Y plugs with a 0.025 in / 0.64 mm gap. Confirm the engine fitted to this car and read the plugs now installed before buying replacements.
Have ready
Phone or camera · labels or tape for lead positions · suitable plug socket for the fitted hex, ratchet and extension · plug-gap gauge · clean brush · verified replacement plugs if renewal is due.
Before removal: park securely, let the engine and exhaust cool completely, switch the ignition off and remove the key. Photograph each high-tension lead from distributor to plug. The owner photo shows the orange leads, but not the markings on the fitted plugs. Work on one cylinder at a time so the leads cannot be swapped. A reproduced 1975 Midget handbook page lists a 1-3-4-2 firing order; it does not identify the actual post positions on this fitted distributor cap. The orange CAD leads show approximate access routes, not reconnection wiring. The separate cylinder-one plug begins a four-plug CAD study. Its M14 × 1.25 shell, 19.05 mm reach, gasket seat and 13/16-inch hex follow Champion’s N-shell code; the installed plugs, head stations and socket clearance remain unverified.
Four correctly identified plugs are installed without crossed threads, the lead order matches the before photos, and the observations are saved in the project plan. A plug’s appearance is evidence to record, not a diagnosis by itself.
Inspect the cooling system
Use your close-up to find the expansion tank, radiator, hoses and fan. The 1975–76 US factory schedule lists a weekly coolant check and periodic cooling-system inspection.
Have ready
Phone or camera · torch · clean rag · project planner. Park level, switch off, remove the key and let the engine cool fully. Never open a hot pressure cap or put hands near a fan when the engine can run.
Scope: this is a visual condition check. Do not add coolant, loosen a hose or remove a cap until you have identified the fitted system and its correct filling procedure.
You have dated photos and a written observation for the tank, radiator, hoses, fan, belt and ground beneath the car. A visually dry system does not prove it will hold pressure; suspected leaks need the correct repair and a proper pressure check.
Trace the heater, intake and vapor canister
Three different assemblies sit close together in this bay. IMG_6892 shows SMITHS on the rear heater case and its hose/outlet layout. IMG_6885–6887 show the separate metal air-cleaner case, elbow and coupling; the Cooper-marked canister is another assembly. Measure and trace each before ordering.
Have ready
Phone or camera · torch · notepad. Park with the key out and engine completely cold. This is an external visual identification; do not disconnect hoses, loosen clamps or remove a cover.
The heater box, carburetor air path and probable vapor canister have separate photo records and visible hose routes. A catalog resemblance alone does not establish exact part numbers or originality.
Next measurements that would improve these guides
A direct recheck of the photographed FP4025UE engine stamp, plus a straight-on view of the dipstick, PF53 filter adapter and sump drain would turn the remaining “locate and verify” steps into exact points on your car. Use the photo measurement worksheet to mark provisional dimensions; the current gasket scale already anchors the rocker-cover footprint in the engine CAD study.