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MOTRS

142 / 144 / 145

1966-1974 / Sedan / Estate / Sweden

All 142 / 144 / 145 problems All workshop issues
Common Engine

Worn Valve Guides and Oil Consumption

Symptoms

Blue smoke on startup or deceleration, fouled spark plugs, rising oil consumption between changes (more than half a litre per 1,000 km).

Cause

Valve stem seals harden and crack; valve guides wear oval. The B18 and B20 were never designed for modern extended oil change intervals, and many have seen neglect.

Fix

Start with valve stem seals, they can be done head-on with a spring compressor and a bit of patience.

If guides are worn beyond spec (check with a dial gauge), they'll need knurling or replacement.

A full valve job isn't expensive at a competent machine shop.

While the head's off, lap the valves, check the seats, and replace the head gasket.

Torque head bolts to spec in the correct sequence, critical to avoid warping.

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Other known issues

Common Engine

Oil Leaks from Front and Rear Crankshaft Seals

Persistent weeping or pooling of oil beneath the engine, especially at the front timing cover or rear main seal area. You'll see oil misting onto the bellhousing or dripping from the sump.
Common Engine

Carburettor Issues (SU or Zenith-Stromberg)

Rough idle, hesitation, stalling when cold, flat spots under acceleration, poor fuel economy, black exhaust smoke.
Critical Engine

Worn Timing Chain or Belt Tensioner

Rattling or slapping noise from the front of the engine, especially on startup or idle. Loss of power, poor running, or misfires if timing has jumped.
Common Cooling System

Radiator Core Leaks and Corrosion

Coolant dripping from the radiator core, overheating, low coolant level without obvious external leaks, white crusty deposits on the radiator.
Critical Cooling System

Thermostat Stuck Open or Closed

Stuck open: engine never reaches normal operating temperature (gauge sits low), poor heater output, high fuel consumption. Stuck closed: rapid overheating, gauge in the red, coolant boiling over.
Common Cooling System

Heater Core Blockage or Leaks

No heat from the vents, sweet smell of coolant in the cabin, wet carpets, fogged windows, low coolant level.
View all 21 142 / 144 / 145 problems