Heavy-Vehicle Gaskets and Sealing

Both manufacturing and supply, by choice

KMQ-branded gaskets and O-ring sets are our own products. Alongside them we source from manufacturing partners we have worked with for years and from brands such as Reinz, Elring and Corteco. That is deliberate: being able to offer both an economical and an original-equivalent option for the same engine is more useful than being tied to a single brand. Which brand each item comes from is shown openly on the product page.

Gasket sets (upper set, full set)

A gasket set brings together the gaskets needed for one engine job. An upper set generally covers the cylinder head area; a full set goes down to the sump and lower group. Set contents vary by engine and emission class — the EURO 3 and EURO 4/5 versions of the same engine do not take the same set. That is why engine code and emission class are always asked for together.

Cylinder head gasket

The cylinder head gasket separates combustion pressure from the coolant and oil galleries. Its thickness grade depends on whether the engine has been machined; on a skimmed surface a standard-thickness gasket will not give the correct clamping. The wrong thickness leads to oil and water mixing and, in the worst case, a cracked head. The engine’s overhaul history should be established before ordering.

Sump, rocker cover and manifold gaskets

The sump gasket handles oil sealing, the rocker cover gasket the top cover area, and the intake/exhaust manifold gasket the hot gas path. Material matters most on the manifold side: a gasket made from the wrong material will leak again within a short time. Even on vehicles with the same engine code, manifold gasket type can vary with specification.

Seals, O-rings and sealing elements

Front and rear crankshaft seals, pinion seals, compressor throat O-ring sets and gearbox seals make up the rest of the sealing family. For these items the product name is not distinctive; dimensions decide — inner diameter, outer diameter and height. If you still have the old part, measuring it is the fastest route.

Information needed for the right gasket

Three pieces of information are almost always enough: engine code, emission class (EURO 3 / EURO 4-5) and whether the engine has been overhauled before. If you have the chassis number, we can derive all three. Dimension-critical seals and O-rings also need measurements. If something is missing, we ask before shipping.

Gaskets by engine

Frequently asked questions about gaskets

What is the difference between a full set and an upper set?

An upper set generally covers the cylinder head and upper group gaskets. A full set adds the sump and lower group. Which one you need depends on the scope of the job.

Are the EURO 3 and EURO 4/5 gaskets for the same engine identical?

No. Even within the same engine code, set contents and some gasket types change with emission class. The emission class must be stated when ordering.

Which head gasket is needed if the engine has been machined?

On a skimmed engine the gasket thickness grade changes. The correct grade can only be established after measurement; it should not be guessed.

How do I choose between a KMQ gasket and another brand?

Both may suit the same application. Budget, lead time and how hard the vehicle is worked decide. When we receive your request we present both options with prices.