We just acquired a very tidy, 5,900 hour 2007 year Hyundai HL760-7 wheel loader It is fitted with a Cummins QSB5.9C engine. The engine starts and runs well, plenty of power and no excess exhaust smoke. But blowby, never seen anything like it. (venting pipe comes from the side of the block, above crankshaft and exits under the engine) Puffs pretty hard on idle but actually pumps out a spray of oil when you rev it up. It looks like the previous owners have tried to remedy it, new rocker cover ( assume valve clearence set) and looks like injector pump overhaul. Some major compression getting into the crankcase by the look of it. I guess we start with a compression check, but it looks like it may need a rebuild. It is inconsistent that a worn out engine runs so smoothly and appears to have full power. Any other ideas to diagnose this issue would be much appreciated. cheers Michael. PS it has spent its life in a concrete batching plant, lots of fine particles, could have been dusted I suppose.
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