8N9174 Cylinder Liner for Caterpillar D353 D379 D398 D399 Engine

8N9174 Cylinder Liner for Caterpillar D353 D379 D398 D399 Legacy Engine Rebuilds

The 8N9174 cylinder liner is used for Caterpillar D353 D379 D398 D399 legacy engine rebuilds. This liner is commonly requested for older large-displacement Caterpillar engines used in generator sets, marine auxiliary engines, oilfield power units, dozers and industrial power equipment.

This page is focused on the 8N9174 liner only. The old Product Description contains a general cylinder liner directory with unrelated Komatsu, Cummins, Mitsubishi and other Caterpillar part numbers. Those unrelated numbers should be removed to keep this page focused on one product intent.

Field Identification Record for 8N9174

Application Scene: Old Caterpillar Power Unit Maintenance

The 8N9174 liner should not be treated as an excavator-only part. Caterpillar D353, D379, D398 and D399 engines are more often searched in old heavy-duty power applications, including stationary generator sets, marine auxiliary engines, oilfield pump drive engines, industrial power units and older dozer engine rebuilds.

For these engines, the repair history is often more important than the machine name. Many units have been rebuilt multiple times, stored for long periods, converted for stationary use or maintained with mixed aftermarket parts.

For this reason, the safest confirmation method is to compare the removed liner, engine model, old part number, liner bore, liner length, flange area and seal requirement before shipment.

Inspection Notes Before Rebuild

When a large legacy Caterpillar engine is opened for repair, the liner should be inspected together with the piston, piston rings, block bore, cylinder head sealing surface and cooling system. A worn liner can cause low compression, blow-by, coolant contamination, oil consumption, hard starting or repeated gasket failure.

For engines used in generator or marine service, coolant-side corrosion is a common concern because the unit may run under steady load or sit idle for long periods. For oilfield and dozer applications, dust, vibration, overheating and high-load operation can accelerate bore wear and sealing failure.

If one cylinder shows severe damage, all cylinders should be measured. Replacing only the visibly damaged liner may not solve uneven wear, coolant chemistry problems or previous assembly errors.

Typical Repair Decisions for 8N9174

Why the Old Directory Table Should Be Removed

The old Product Description includes a long liner list for Komatsu, Cummins, Caterpillar and Mitsubishi engines. That type of list belongs on a category guide or catalog page, not on a single 8N9174 product page.

Keeping unrelated numbers such as 3904167, 3904166, 3919937, 3802407, 3022157, 5I-7523, 2W6000 or ME041105 may cause the page to look like a mixed cylinder liner directory instead of a focused Caterpillar D353 D379 D398 D399 liner page.

For better SEO clarity, this page should only discuss 8N9174, its related reference numbers, D353 D379 D398 D399 engine applications, dimensions, seal requirements and ordering checks.

Pre-Order Verification Checklist

Before ordering 8N9174, confirm the engine model, old liner number, removed liner dimensions and seal requirement. Key checks include bore, outer diameter, total length, flange diameter, flange width, lower sealing area and O-ring groove position.

If the liner is for a generator set, marine auxiliary engine or industrial power unit, provide the engine nameplate and photos of the removed liner. If the liner is for a dozer or heavy machine, provide both the machine model and engine information.

If the engine has been rebuilt before, provide any known rebuild history. Previous machining, mixed parts or old stock replacement can affect the final confirmation process.

Installation and Failure Prevention Notes

Clean the cylinder block liner bore, counterbore and sealing area before installation. Rust, scale, old seal residue, burrs or coolant-side pitting can affect liner seating and sealing performance.

Check liner protrusion and seating according to the engine service manual. On large wet sleeve engines, uneven liner height can affect fire ring loading, cylinder head gasket life and combustion sealing.

During overhaul, inspect piston rings, piston cooling, injectors, cylinder head condition, cooling system, lubrication quality and air filtration. Replacing the liner without correcting the root cause may lead to repeated failure.

After rebuild, monitor coolant level, oil condition, crankcase pressure, exhaust smoke and operating temperature during the first operating period, especially for generator sets and marine engines that may return directly to continuous-load service.

Why Source 8N9174 from Topvelsun?

Topvelsun supplies replacement engine parts for heavy equipment, generator sets, industrial engines, marine auxiliary engines and legacy Caterpillar engine service. For 8N9174 cylinder liner orders, we help buyers compare part number, engine reference, old liner photos and key dimensions before shipment.

This product is suitable for engine rebuilders, generator maintenance teams, marine service workshops, oilfield equipment service teams, used machinery rebuilders, parts distributors and overseas buyers working on Caterpillar D353 D379 D398 D399 engine repair.

FAQ

What engine is 8N9174 mainly used for?

8N9174 is commonly associated with Caterpillar D353, D379, D398 and D399 cylinder liner applications. Final fitment should be verified by old liner, engine model and dimensions.

Is this liner only for excavators?

No. 8N9174 is better described as a Caterpillar legacy engine liner. It may be used in generator sets, marine auxiliary engines, oilfield power units, dozers and other heavy-duty applications depending on the engine configuration.

Are 1S2587 and 7N5681 related to 8N9174?

Some aftermarket references list 1S2587 and 7N5681 in the same reference group as 8N9174. They can be used as checking references, but the removed liner and dimensions should still be confirmed.

What dimensions should be checked before ordering?

Check the 6.25 inch or 158.75 mm bore reference, total length, flange diameter, flange width, sealing area and O-ring groove position. Measuring the removed liner is the safest method before shipment.

Can Topvelsun help verify the correct liner before shipment?

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