
The temptation to rebuild old engines using spare diesel parts should be tempered with diagnostic results. A Detroit Diesel engine that has surpassed expected mileage barriers may not need to be reconstructed or rebuilt immediately. Owners and operators using diesel-fueled vehicles should invest time in diagnostics before investing money in rebuild kits.
An overlooked area of diesel-engine maintenance is tracking fuel-efficiency numbers. The overall efficiency of a Detroit Diesel product depends on maintaining a high compression ratio. This ratio determines the amount of pressure applied on diesel fuel and air before combustion occurs. A truck that experiences drastic decreases in diesel mileage might need a rebuilt engine.
There are several tests that need to be completed before cobbling spare parts together for an engine rebuild. A mechanic should examine oil quality and pressure by examining the dipstick. Experienced mechanics can identify contamination, water leaks and sludge by taking a look at the dipstick.
Diesel-engine problems may be related to poor battery and starter performance. Every shop should have a terminal-voltage reader for batteries to assess serious drops in voltage after ignition. This same method can be used to determine power shortages in cables leading to the starter.
An examination of individual cylinders can reveal problems that are less expensive to treat than engine rebuilds. A busted fuel injector or exhaust valve can be replaced with spare parts found in most garages. Mechanics should isolate each cylinder and injector to eliminate full-engine failure from their checklist of ailments.
Internet Diesel sells spare parts for diesel engines. The company's online store offers overhaul kits direct from manufacturers.