Guide · Parts

Diesel engine service at 500 and 1000 hours

A 500-hour diesel engine service usually includes replacing the oil and oil filter and the fuel filters and water separator, and checking the air filter and belts; at 1000 hours this is often supplemented by replacing the air filter, checking the valve clearance and inspecting the cooling system. The list and intervals differ from engine to engine, so the manufacturer's manual for your engine applies, not a general rule.

Authoritative: engine manufacturer's manual
Perkins service kits: 500 and 1000 hours, genuine parts
Parts delivery: from stock or 1 working day

The manual first, then this guide

Service intervals and scope depend on the manufacturer, series and version of the engine. The same model can have different intervals depending on the oil, the fuel and the operating conditions. This guide describes what services at 500 and 1000 hours usually cover, so that you know what to prepare. For your engine, the manufacturer's manual (Operation and Maintenance Manual) and the engine serial number are what count.

If you do not have the manual, send us the make, model and serial number of the engine and we will help with a parts list.

What usually goes into a 500-hour service

Item	Usually	Note
Engine oil	replace	On many engines the oil interval is even shorter, for example 250 hours. Use the oil to the specification in the manual.
Oil filter	replace	Always together with the oil change.
Fuel filter and water separator	replace the cartridges	Drain the water from the separator between services too.
Air filter	inspect, clean or replace	According to the restriction indicator if the engine has one; more often in dust.
Belts	check condition and tension	Replace a cracked or glazed belt.
Cooling system	check coolant level and condition	Also check the hoses and the cleanliness of the radiator.
Leaks, hoses, connections	visual inspection	Oil, fuel and coolant.

What is usually added at 1000 hours

Item	Usually	Note
All items of the 500-hour service	as above
Air filter (primary element)	replace	The safety element as per the manual.
Valve clearance	check and adjust	On some engines at this interval, on others less often. A new valve cover gasket often goes with the adjustment.
Belts	replace if the manual or their condition requires
Crankcase breather	check or replace the filter	If the engine has one.
Coolant	check the concentration	Replace per the hours or years in the manual.
Engine mounts, exhaust, turbocharger	inspect	Play and oil leaks at the turbocharger.

Service kits

A service kit contains the parts for one service interval in one place: the filters, gaskets and other parts that service calls for. For Perkins engines we offer service kits with genuine Perkins parts for 500 and 1000 hour maintenance. The advantage of a kit is a lower price than buying the parts one by one, and you do not forget anything.

For engines from other manufacturers (for example Caterpillar, Cummins, Yanmar, Kubota or Deutz) we put together the service parts by engine serial number.

Conditions that shorten the intervals

Dust: a building site, quarry, agriculture. Replace the air filter and oil more often.
A lot of idling or running at low load.
Frequent short duty cycles and cold starts.
Fuel of doubtful quality or water in the fuel.
High ambient temperatures and heavy work without a break.

Manuals usually have a separate table for severe operating conditions. If your machine works like that, go by it.

Oil: by specification, not by habit

Engine manufacturers specify oil by standards and specifications, not just by viscosity. An oil that does not meet the specified specification can shorten the interval or damage the engine. We offer oils and lubricants from brands such as Fuchs, Mobil and Aral, with advice on which oil suits your engine. More on the Oils and lubricants page.

What to send for a service

The make, model and serial number of the engine (from the plate).
The machine the engine is in (excavator, forklift, generator, boat).
The current number of running hours and which service is due.
If you have them: the catalogue numbers of the filters from the last service.

Record every service: the date, the hours and what was replaced. The log helps at the next service and when you sell the machine.

If you find a bigger fault during the service, we also offer overhaul parts, and for the repair we refer you to experienced service technicians. See Engine parts and overhaul kits.

Frequently asked questions

What is replaced at a diesel engine service at 500 hours?

Usually the oil, oil filter and fuel filters, along with checking the air filter, belts and cooling system. The exact list is in the manual from your engine's manufacturer.

What is the difference between a 500-hour and a 1000-hour service?

At 1000 hours, in addition to the items of the 500-hour service, the air filter is often replaced and the valve clearance checked. On some engines the valve clearance is on a different interval, so check the manual.

Do you have service kits for Perkins?

Yes, we offer service kits with genuine Perkins parts for 500 and 1000 hour maintenance. Send the engine serial number so we can choose the right kit.

Can I extend the oil change interval?

Only if the manufacturer's manual allows it for the oil and the conditions the engine works in. In dust, at idle and in short cycles the intervals are as a rule shorter.

What do you need to prepare the parts for a service?

The make, model and serial number of the engine, the number of running hours and which service is due. If you have the catalogue numbers of the filters from the last service, send those too.