3904166 Diesel Engine Cylinder Liner for Cummins Engine 4BT 6BT

3904166 Cylinder Liner for Cummins 4BT / 6BT B-Series Engine Repair

The 3904166 cylinder liner is used for Cummins 4BT / 6BT B-series diesel engine repair and rebuild work. It is commonly requested when a compact Cummins engine has bore wear, compression loss, piston scuffing, liner corrosion or a block repair requirement.

Unlike large mining-engine liners, this part is often ordered for mixed equipment fleets: small construction machines, forklifts, loaders, generator sets, agricultural equipment, commercial vehicles and industrial power units. Before ordering, the old liner and engine nameplate should be checked together.

Where 3904166 Is Commonly Used

A Practical Liner for Mixed B-Series Equipment Fleets

Many buyers do not search for 3904166 from one machine model only. The same Cummins B-series engine family may appear in construction machinery, generators, industrial equipment, agricultural machines and commercial vehicles. This is why the engine model and removed liner dimensions are more reliable than the machine name alone.

For repair shops, this liner is usually ordered when an older 4BT or 6BT engine is being rebuilt after long service hours, overheating, coolant contamination, poor air filtration or piston damage.

For parts distributors, 3904166 is a useful B-series engine stock item because customers may ask by part number, engine model, bore size or old sleeve sample.

Check the Sleeve Type Before Ordering

The most important point for this item is not only the part number. Buyers should also confirm whether the removed sleeve is dry type, semi-finished, finished, with collar, or a salvage repair sleeve. Market listings for 3904166 may show different outer diameters or length references depending on the sleeve version.

If the engine block has already been machined during a previous rebuild, the new liner should be selected by actual block condition and liner dimensions, not by catalog number alone.

For this reason, Topvelsun recommends checking the old liner photo, bore size, outer diameter, total length, collar area and engine nameplate before shipment.

Common Failure Backgrounds

Information to Send Before Shipment

To reduce wrong-part risk, send the old part number, engine model, equipment model and photos of the removed liner. If possible, include measurement photos for the bore, outer diameter, total length and collar position.

For generator sets and industrial engines, the engine nameplate is often more useful than the equipment name. For construction machinery and forklifts, both the machine model and engine model should be checked.

If the original liner is missing, provide the engine block bore measurement and rebuild history. This is especially important when the block may have been sleeved or machined before.

Installation Notes for B-Series Engine Rebuilds

Before installation, clean the cylinder block bore and check for rust, scoring, deformation or machining marks. A poor block bore condition can affect liner seating and service life.

The mechanic should confirm the correct liner type and machining requirement before pressing or fitting the sleeve. If a semi-finished liner is used, final machining must follow the engine rebuild specification.

After assembly, check the cooling system, lubrication system, air filter system and break-in condition. Many liner failures are related to overheating, dirty intake air, poor lubrication or incorrect rebuild procedure rather than the liner alone.

Why Source 3904166 Cylinder Liner from Topvelsun?

Topvelsun supplies diesel engine repair parts for heavy equipment, generators, industrial engines and fleet maintenance projects. For 3904166 orders, we can help compare engine model, liner dimensions and old part information before order confirmation.

This product is suitable for repair workshops, parts distributors, fleet service teams and overseas buyers who need a practical replacement liner for Cummins B-series engine rebuild work.

FAQ

What engine is 3904166 mainly used for?

3904166 is mainly used as a cylinder liner reference for Cummins 4BT and 6BT B-series engine applications. Final fitment should be checked by engine model, old liner and dimensions.

Is 3904166 only for excavators?

No. Cummins 4BT and 6BT engines are used in many types of equipment, including construction machinery, generators, agricultural machines, vehicles and industrial power units. The engine model is more important than the machine category alone.

What size should I check before ordering?

Check the bore, outer diameter, total length and collar area. Common references for this liner include a 102 mm bore and approximately 200 mm length, but the removed liner should be measured before ordering.

Why do some listings show different OD or length data?

Some listings may refer to dry sleeves, semi-finished sleeves, finished sleeves, collar versions or salvage repair sleeves. The actual sleeve version should be confirmed by old liner dimensions and engine block condition.

Can Topvelsun help confirm the correct 3904166 liner before shipment?

Yes. Buyers can send the old liner photos, engine model, machine information and measurement photos. Topvelsun can help compare the information before order confirmation.