car techie

Custom Search

Accessories     Absorber      Air-conditioning     Alignment     Battery    Car news     Car photos     Carburetor     Clutch      Compression     Color      Converter    Disc brakes    Door    Engine    Gasket   Gear    Glass     Ignition     Light     Maintenance     Oil / fuel



 
Buy a car
 
Replacing pistons

Question : AFTER a breakdown, my 1999 Proton Wira had to be towed to a workshop which later reported that the vehicle had a cracked piston that must be replaced.

I have been told that it is not a good idea to replace a single piston but, instead, should replace all four as a set, and to carry out a complete engine overhaul at the same time, at a cost of about $4,000.

I would appreciate your advice on whether all this work is really necessary.

Answer : THE amount of work required depends very much on the mileage that the vehicle has travelled, as well as the amount of internal damage that has occurred.

In reply to your first query, it is commonplace that pistons are sold as a complete set, rather than as singles, since it is imperative that there is a limit to the weight difference between pistons in order to maintain engine balance.

Engine imbalance results in vibration and premature wear of some components. Although pistons used to be available from vehicle manufacturers or from third party component suppliers as singles, these are becoming increasingly scarce.

The work and time required to replace a single piston is not much less compared to a complete engine overhaul.

If the engine has already done a substantial mileage, say in excess of 100,000km, it is probably advisable to do a complete overhaul since the additional costs involved would encompass machining work such as grinding of the crankshaft journals, and boring of the cylinders.

In addition, you would also require new sets of main and connecting-rod bearings. An overhauled engine is capable of covering as much mileage as a brand new engine.

 
  
 

Replacing pistons

   

Others
 
Piston
 
Polishing
 
Rim
 
Roof
 
Sensor
 
Sound
 
Spark plugs
 
Spring
 
Stains
 
Steering
 
Suspension
 
Tappet
 
Timing belt
 
Tyre
 
Valve

     

Sites of similar field are welcome for exchanging links