The Suzuki H25A 2.5-liter V6 petrol engine was produced by the company from 1996 to 2005 and was installed only on the popular Grand Vitara SUV and its clones such as the Chevrolet Tracker. Until 2002, the power unit developed a power of 144 hp and 208 Nm, and after that it was already 158 hp and 213 Nm.
Engines of the H-series: H20A, H25A, H27A.
In 1996, the H20A engine appeared on the first generation Escudo, but this engine was most widely used on the second Escudo or Grand Vitara. By design, this is a typical V6 unit for its time with a cylinder camber angle of 60°: it has a distributed fuel injection, an aluminum cylinder block with cast-iron liners, two aluminum DOHC cylinder heads with hydraulic compensators and a complex timing drive of their three chains.
Specifications
| Production years | 1996-2005 |
| Displacement, cc | 2493 |
| Fuel system | distributed injection |
| Power output, hp | 144 – 158 |
| Torque output, Nm | 208 – 213 |
| Cylinder block | aluminum V6 |
| Block head | aluminum 24v |
| Cylinder bore, mm | 84 |
| Piston stroke, mm | 75 |
| Compression ratio | 9.5 |
| Hydraulic lifters | yes |
| Timing drive | chains |
| Turbocharging | no |
| Recommended engine oil | 5W-30, 5W-40 |
| Engine oil capacity, liter | 5.7 |
| Fuel type | petrol |
| Euro standards | EURO 3 |
| Fuel consumption, L/100 km (for Suzuki Grand Vitara 2001) — city — highway — combined |
13.5 8.3 10.2 |
| Engine lifespan, km | ~400 000 |
The engine was installed on:
- Suzuki Escudo 1 (ET) in 1996 – 1998; Escudo 2 (FT) in 1998 – 2005;
- Suzuki Grand Vitara 1 (FT) in 1998 – 2005.
Disadvantages of the Suzuki H25A engine
- The gas distribution mechanism here consists of three chains and three hydraulic tensioners, which are very demanding on the quality of the oil used and the procedure for replacing it. Savings turn into a tensioner wedge and a chain jump fatal for the motor.
- After 150,000 km, an oil burner appears quite often and it grows rapidly with mileage. And the main reason is not the wear of the rings or caps, but the clogged oil labyrinth of the valve covers, which here serves as part of the crankcase ventilation system.
- One of the most widespread problems of power units of the H line is lubricant leaks. Most often, oil climbs from under the front cover of the engine, both crankshaft oil seals, and also through the oil channel gaskets at the junction of the block with the crankshaft bed or pan.
- The weak points of such motors include an unreliable mass air flow sensor and a quickly clogged EGR valve, and very often its inlet pipe bursts.
