The Chrysler B156 is a 1,557 cc, inline‑four petrol engine produced between 1985 and 1987. It featured a single overhead camshaft (SOHC) design and two valves per cylinder, delivering modest outputs for its era. Equipped with a carburettor for fuel delivery, it produced approximately 59 kW (80 PS) and 122 Nm of torque, prioritising reliability and cost‑effective manufacturing for entry — level models.
Fitted primarily to the European‑spec Chrysler Horizon and Dodge Om…
Production years 1985–1987 meet Euro 1 standards as per the applicable regulations of the time (EU Directive 70/220/EEC).
The Chrysler B156 is a 1,557 cc inline‑four petrol engine engineered for compact hatchbacks (1985-1987). It combines a simple SOHC valvetrain with carburetted fuel delivery to deliver adequate power for urban driving. Designed to meet Euro 1 emissions standards, it prioritised mechanical simplicity and owner affordability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,557 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 76.0 mm × 86.0 mm | |
Power output | 59 kW (80 PS) | |
Torque | 122 Nm @ 3,500 rpm | |
Fuel system | Single-barrel carburettor | |
Emissions standard | Euro 1 | |
Compression ratio | 9.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Belt-driven (requires periodic replacement) | |
Oil type | SAE 10W‑40 (mineral or semi-synthetic) | |
Dry weight | 115 kg |
The Chrysler B156 was used across Chrysler's Horizon platform with transverse mounting. This engine received no major platform-specific adaptations during its short production run. All adaptations are documented in OEM technical bulletins.
The B156's primary reliability risk is timing belt system failure, with elevated incidence in high-mileage or poorly maintained examples. Chrysler service data indicates a significant number of failures occurring beyond the 80,000 km service interval, while owner reports frequently cite ignition system issues as a secondary concern. Neglecting the distributor drive gear update and extended service intervals make catastrophic engine damage or sudden stalling likely.
Analysis derived from Chrysler technical bulletins (1985-1987) and owner workshop manual data. Repair procedures should follow manufacturer guidelines.
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The B156 can be reliable if meticulously maintained, particularly regarding the timing belt and distributor drive gear. Its simple, robust design is a strength, but neglect, especially of the timing system and ignition components, leads to major failures. Regular servicing and using quality parts are key to longevity.
The most critical issue is timing belt tensioner failure, followed by distributor drive gear wear causing sudden stalling. Carburettor wear causing running problems and cooling system leaks (hoses, water pump) are also very common on high-mileage examples.
The B156 engine was used in the European-market Chrysler Horizon, as well as its North American counterparts, the Dodge Omni and Plymouth Horizon, from 1985 until 1987. It was typically the base engine option for these models.
Minor power gains are possible through carburettor tuning, a performance exhaust, or an aftermarket air filter. However, its SOHC, 8-valve design is a significant limitation. Major power increases require extensive, costly modifications that are generally not practical.
Fuel economy is good for its era. Expect around 8.0–9.0 L/100km (35–31 mpg UK) in combined driving. Highway cruising can yield closer to 6.5 L/100km (43 mpg UK), while city driving will be higher, around 10.0 L/100km (28 mpg UK).
Yes. The Chrysler B156 is an interference engine. If the timing belt breaks or jumps, the pistons will collide with the open valves, causing severe and expensive internal engine damage. This makes adhering to the timing belt service schedule absolutely critical.
Chrysler recommended a good quality SAE 10W-40 mineral or semi-synthetic oil for the B156. Using an oil that meets API SF/CC specifications or equivalent is important for protecting the older engine design and preventing sludge buildup.
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