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MITSUBISHIInformation - Piston
Engine piston: replacement and selection
When and why it is necessary to replace engine piston
The engine pistons have no specific lifetime limit. Usually, they are replaced in case of deformation, breakage, burning-out, wear of the mounting hole of the piston pin.
Appearance of piston defects is caused by the following: insufficient or low quality of lubrication, impacts of foreign objects (such as split-off part of the connecting rod, crankshaft or valve), hydraulic shock caused by ingress of water into the cylinders (for example, after driving through a deep puddle). Deformation of the pistons can occur due to usage of spare parts with excessive head height, or due to insufficient sealing of the cylinder head when doing major engine overhaul. Breakage can occur as a result of collision of the pistons with valves, when too high rotation speed of the crankshaft doesn’t allow to pull the valves back, and due to detonation in the cylinder.
Signs of components defects are pistons knocking, especially at engine warming up, and rattling sound of the warmed up engine.
The pistons are replaced in a set. Also, during their replacement you need to install new piston pins and rings. The connecting rods are also replaced if necessary. After all works finishing, you need to carefully use the engine for about 1,000 – 2,000 km, avoiding wheel slipping, high rpm and heavy loads transportation.
How to select piston
The pistons differ by production method, and can be die-cast or forged.
The shape of the piston top (piston head top surface) depends on the type of the engine, on configuration and volume of the combustion chamber, location of the valves, aspects of fuel-air mixture supply into the chamber, and other factors. In gasoline engines the piston top is flat or with recesses responsible for full opening of the valves. There are combustion chambers made in piston tops of direct injection diesel engines. Their shape allows to provide better whirling and formation of mixture.
The components which are able to perform their functions for a long time, are produced by well-recommended manufacturers only. Kolbenschmidt, Mahle Original, Nural, IPSA, Et Engineteam and others are amongst them.
Select the components strictly for your engine. This will help to avoid incompatibility of the parts by diameter, length, compression height, weight and other factors, important for engine operation. Beside that, a high quality parts kit for the exact car will include the piston pins and bushes. Sometimes, a set of the piston rings can be added.
Piston at low cost: Top Spares
Article №: PM001250 
- Cylinder Bore [mm] 86,5
- Oversize [mm] 0,5
- Compression Height [mm] 43,420
- Recess Depth 1 [mm] 15,850
- Recess Diameter [mm] 46,900
- Length [mm] 69,820
- Bolt Ø [mm] 30
- Bolt length [mm] 66,85
- Supplementary Article/Info 2 with piston ring carrier, with cooling duct, for keystone connecting rod
- Supplementary Article/Supplementary Info with piston rings
- Condition New
Article №: 029 82 00 
- Supplementary Article/Supplementary Info with piston rings
- Standard Size [STD]
- Cylinder Bore [mm] 79,51
- Length [mm] 65,65
- Compression Height [mm] 39,65
- Recess Depth 1 [mm] 1,9
- Recess Diameter [mm] 26,5
- Top land height [mm] 11,1
- Bolt Ø [mm] 24,0
- Bolt length [mm] 64,0
- Connecting Rod Design Trapezoidal Connecting Rod
- Production Number 79 V 97
- Supplementary Article/Info 2 with piston ring carrier, without cooling duct
- Machined with cut-out for oil jet
- Component Number 2.M2,0 IFU Cr P, 3. DSF 3,0 Cr
- Condition New
Article №: 40846600 
- Bolt Ø [mm] 19
- Bolt length [mm] 54
- Production Number 076212
- Bore Ø [mm] 76,51
- Compression Height [mm] 28,97
- Length [mm] 49,97
- Piston protrusion [mm] 2
- Recess Depth 1 [mm] 4,57
- Valve pocket depth 1 [mm] 4
- Valve pocket depth 2 [mm] 1,3
- Standard Size [STD]
- Condition New
Article №: 87-433900-10 
- Length [mm] 48,000
- Cylinder Bore [mm] 76,50
- Piston protrusion [mm] 1,850
- Bolt Ø [mm] 19
- Supplementary Article/Info 2 with piston ring carrier, for keystone connecting rod
- Component Number 08-433900-00
- Compression Height [mm] 29,000
- Bolt length [mm] 53,5
- Recess Depth 1 [mm] 6,400
- Valve pocket depth 1 [mm] 1,000
- Valve pocket depth 2 [mm] 3,800
- Standard Size [STD]
- Product line Elastoval ®
- Piston Clearance [mm] 0,050
- Condition New
Article №: 90732620 
- Bolt Ø [mm] 24
- Bolt length [mm] 64
- Component Number 32922, 35517, 39240
- Quantity 3
- Production Number 076118
- Bore Ø [mm] 77,51
- Compression Height [mm] 41,45
- Length [mm] 71,45
- Recess Depth 1 [mm] 1,6
- Oversize [mm] 1,00
- Condition New
Article №: 90732610 
- Bolt Ø [mm] 24
- Bolt length [mm] 64
- Component Number 32919, 35516, 39239
- Quantity 3
- Production Number 076118
- Bore Ø [mm] 77,01
- Compression Height [mm] 41,45
- Length [mm] 71,45
- Recess Depth 1 [mm] 1,6
- Oversize [mm] 0,50
- Condition New
Article №: 87-427700-50 
- Length [mm] 74,820
- Cylinder Bore [mm] 86,00
- Machined with cut-out for oil jet
- Bolt Ø [mm] 30
- Supplementary Article/Info 2 with cooling duct, with piston ring carrier, for keystone connecting rod
- Component Number 08-427700-00
- Production Number 08683-607
- Compression Height [mm] 48,420
- Recess Diameter [mm] 49,040
- Bolt length [mm] 66,85
- Recess Depth 1 [mm] 16,170
- Standard Size [STD]
- Piston Clearance [mm] 0,050
- Condition New
Article №: 87-434600-00 
- Length [mm] 51,100
- Cylinder Bore [mm] 84,00
- Bolt Ø [mm] 22
- Supplementary Article/Info 2 for keystone connecting rod
- Component Number 08-434600-00
- Production Number 0841W-407
- Compression Height [mm] 32,400
- Recess Diameter [mm] 52,500
- Bolt length [mm] 51
- Recess Depth 1 [mm] 3,725
- Valve pocket depth 1 [mm] 3,090
- Valve pocket depth 2 [mm] 3,160
- Standard Size [STD]
- Product line EcoTough ®
- Piston Clearance [mm] 0,033
- Condition New
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