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Le moteur et rien que le moteur !

Technical Information


An engine component may be identified, either by reference to the vehicle (make – model – initial year of production, serial number) or by reference to the dimensions of the component sought.

In the first case:

it will therefore be necessary to check all the descriptive elements for the product concerned, as posted on our pages, particularly the complete engine type. Vehicle manufacturers may use the same engine blocks for years, or even decades, and will regularly incorporate modifications or developments. For the example, the F8Q engine type (Renault diesel) is always followed by 3 digits. These 3 digits are an essential means of determining whether a component can be fitted to a given F8Q engine, but will not be compatible with another.

For the conduct of any search on the “” site, for any telephone and/or fax enquiry, we would recommend that you have at least the following information to hand:

Make of vehicle
Model of vehicle
Initial year of production
Engine type (marked on a plate or engraved on the engine)

together with any other information which will help to refine your search

Engine type serial no.
Type of registration document [carte grise]

Number of cylinders
Cylinder bore
Dimensions of the components required

In the second case:

it will be necessary to complete accurate measurements of the component required, in order to eliminate the risk of error to a maximum degree. Measurements must therefore be taken by a standardized method, in order to reduce the risk of errors in interpretation.

For the measurement of the dimensions of pistons – jackets – bearings and valves, you may refer to our model dimensions for components produced “to a plan/model” on our home page.

N.B.: for the measurement of a machined component, it will be necessary to determine the original dimensions in order to identify the correct reference and, in consequence, the repair dimensions required for the restoration of your engine (essentially for the identification of crankshaft bearings).

For the dimensioning of rings, measurements will be taken by vernier gauge, measuring the cylinder bore or piston diameter in the first instance (measured approximately 1 cm from the base of the skirt, perpendicular to the axis of the piston). The thickness of the ring will then be measured, and careful attention must be paid to the profile or the specific characteristics of the ring concerned.

Main types of 4-stroke rings

R = Rectangular        L = “L”-section B = Convex seating
M = Conical seating     K or T = Trapezoidal    HK or HT = Semi-trapezoidal    

           E= Right-angle  shoulder         

N = Beak-section ring  EM = Conical right-angle shoulder
NM = Conical beak section  S = Slotted oil control ring

  G = S + parallel bevel edges

D = G + symmetrical edges  SF = S/G/D option with helical spring loading


Main types of 2-stroke rings

R = Rectangular L = “L”-section      B = Convex seating HK = Semi-trapezoidal

Main options

 NE = Lateral slot/tappet face    NH = Internal slot/internal tappet
KI = Internal bevels  KA = External bevels  CR = Chromium-plated


VER = Straight     OBD = Oblique OBG = Left oblique
SV = Interlocking bayonet SH = Hooked  NH = Internal slot NE = Lateral slot



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