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2.0L 16v - 175A1
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2.0L 16v - 175A1
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Set of 10 tri-metal crankshaft main bearing half shells for Fiat, Lancia and Alfa Romeo engines (Ø 53 mm).
This main bearing set fits a family of four-cylinder petrol engines from 1.6 to 2.0 litres, naturally aspirated and turbocharged, fitted notably to the Fiat Croma, Tempra, Tipo and Coupé, the Lancia Delta (including the HF Integrale), Thema, Dedra and Kappa, and the Alfa Romeo 155 and 164. All the applications listed below share the same crankshaft journal and housing dimensions: a single bearing set covers these engines.
The crankshaft of these engines runs on five main bearings. Each journal turns between two half shells, one seated in the block and the other in the main bearing cap: they carry the crankshaft. The ACL Race Series tri-metal set shown here replaces them on built engines.
A tri-metal bearing stacks three layers: a steel back, a copper-lead intermediate layer with high load capacity and an anti-friction running surface that protects the journal. The complete set covers the five main bearings of the crankshaft. The upper and lower half shells are identical.
An aluminium bi-metal takes around 8,000 psi, a performance tri-metal up to 12,000 psi, 50% more. Hence better resistance and better durability on turbocharged, supercharged and high-revving engines.
| ACL bearings Crankshaft journal Ø 52.991 / 53.000 mm Housing bore Ø 56.717 / 56.735 mm Width 20.75 mm |
| Reference | Brand and treatment | Size | Wall thickness (mm) |
|---|---|---|---|
| 5M2908H-STD | ACL Race - Untreated | Standard | 1.843 |
| 5M2908HX-STD | ACL Race - Untreated | Std, increased clearance (HX) | 1.830 |
| 5M2908H-.025 | ACL Race - Untreated | +0.025 | |
| 5M2908H-.25 | ACL Race - Untreated | +0.25 |
The running clearance is the gap between the bearing and the journal where the oil film flows.
In operation, the crankshaft journal does not rub against the bearing: it rides on this oil film, which carries the load. Clearance sets the thickness of this film: too tight, oil flows poorly, temperature rises and the risk of seizure increases; too loose, oil escapes, the film loses load-carrying capacity and oil pressure drops. The right clearance is the balance between adequate lubrication and a well-maintained oil film.
| Size / grade | When to choose it | ACL Race Series |
|---|---|---|
| Standard (STD) | Standard journal, not reground | 0.055 to 0.066 mm |
| Increased clearance (HX) | Wider clearance: high oil flow, high rpm | 0.081 to 0.091 mm |
| +0.025 mm | Polished journal | 0.055 to 0.066 mm |
| +0.25 mm | Journal reground to 0.25 mm | 0.055 to 0.066 mm |
Checking on assembly: lay a calibrated strip (Plastigauge) on the journal, torque the main cap to spec, then compare the crushed strip against the gauge to read the clearance.
The ACL main bearings shown here are trimetal bearings, designed for engine building and racing. Compared with an original bearing, they handle far higher loads: they cope with increased power, high rpm or the addition of a turbo or supercharger, where a standard bearing quickly reaches its limit.
 | ACL Bearing Company, an Australian manufacturer of high-performance engine bearings since 1949, offers with its Race Series precise trimetal bearings, available in many sizes and proven on built engines worldwide. |
This main bearing set fits the following vehicles, by engine code:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Alfa Romeo | 155 (167_) | AR 67203 | 186–190 hp | 1992–1997 |
| Alfa Romeo | 164 (164_) | AR 06476 | 174–175 hp | 1987–1998 |
| Fiat | Coupe (175_) | 175 A1.000, 836 A3.000 | 139–190 hp | 1993–1996 |
| Fiat | Croma (154_) | 154 A1.000, 154 A2.000, 154 C4.046, 154 C5.000, 154 E1.000, 834 C.146 | 90–155 hp | 1985–1996 |
| Fiat | Tempra (159_) | 154 C4.000, 154 E1.000, 836 A4.000 | 69–165 hp | 1990–1998 |
| Fiat | Tempra S.w. (159_) | 836 A4.000 | 69 hp | 1992–1996 |
| Fiat | Tipo (160_) | 160 A5.000, 160 A8.046, 836 A3.000, 836 A4.000 | 70–146 hp | 1989–1995 |
| Lancia | Dedra (835_) | 835 A5.046, 835 A7.000, 835 A7.046, 835 A8.000, 835 A8.046, 836 A3.000 | 113–177 hp | 1989–1999 |
| Lancia | Dedra SW (835_) | 836 A3.000 | 139 hp | 1994–1999 |
| Lancia | Delta I (831_) | 831 A7.000, 831 B3.000, 831 B5.000, 831 B7.046, 831 C5.000, 831 C5.046, 831 D5.000, 831 E5.000, 831 E5.046 | 131–215 hp | 1983–1994 |
| Lancia | Delta II (836_) | 175 A4.000, 836 A2.000, 836 A3.000, 836 A4.000 | 69–193 hp | 1993–1999 |
| Lancia | Thema (834_) | 834 C.000, 834 C.146, 834 C1.000, 834 C1.246, 834 F1.000, 834 F2.000 | 150–201 hp | 1984–1994 |
| Lancia | Thema SW (834_) | 834 C.000, 834 C.146, 834 C1.000, 834 C1.246, 834 F1.000, 834 F2.000 | 150–201 hp | 1987–1994 |
