The JASPER Process: Engines

JASPER® can offer this beefy warranty on our remanufactured gas engines because every one of them goes through our extensive “Do It Right” process that ensures worry-free operation. Click here for a full warranty disclosure. Our optional Premium Service Plan provides allowances for such items as towing, car rental, fluids and premium labor should a problem arise. Click here for details and limitations.

Every JASPER reman gas engine is completely disassembled. Blocks, heads, connecting rods, crankshafts and camshafts are thoroughly cleaned through a variety of processes to remove contaminants that can result in premature wear to internal engine components and early engine failure.

Crankshafts are precision machined to exact tolerances with no odd size bearings or journals. Thrust surfaces (domestic engines) are micro-polished to provide precise surface finishes for smooth engine operation and reduced thrust bearing wear. Every journal is inspected and measured with critical accuracy. After machining, oil holes are chamfered to improve lubrication and every journal polished to a smooth finish for long bearing life. Crankshafts are thoroughly cleaned with special emphasis to flushing and brushing out oil passages to remove any contaminants.

Camshafts are inspected for wear, dimensional accuracy and gauged for straightness. Camshaft lobes are carefully machined to correct specifications. Each shaft is Parco-Lubricated to improve lubricant adhesion, especially during break-in. Any camshaft not meeting JASPER’s exact specifications is replaced.

Cylinders are bored and honed to exact specifications. Most gas engines are torque plate honed – a process we learned from our involvement in NASCAR – that eliminates cylinder distortion after the head is bolted and torqued to the block. This process eliminates a major cause of engine blow-by. Blocks are carefully inspected for cracks and flaws through procedures such as magnetic particle inspection. Cylinder finish and size are closely monitored to industry surface finish standards as well as for accuracy and consistency. This assures smooth piston travel and engine performance. JASPER guarantees no odd size cylinders. The block to head mating surface is closely inspected and resurfaced as required to provide the correct surface finish for today’s gasket materials.

Connecting rods are machined and gauged to within a half a thousandth for improved operation, especially in today’s engines. Rods are carefully machined to avoid taper and to the standard diameter of original equipment. All rods are checked for bend and twist to assure smooth operation.

Heads are carefully inspected for cracks and flaws through procedures such as magnetic particle inspection. Every head is resurfaced to exact dimensional tolerances and the surface finish is carefully monitored for proper sealing with the block. Valve seats and guides are machined to exact specifications or replaced to assure correct valve alignment and seating and optimum engine performance.

Every gas engine is precisely assembled by trained JASPER builders. Attention to such details as a final wash of new and machined parts and pre-lubricated camshafts, pistons, and crankshaft journals assures a clean, smooth running engine that performs to your expectations.

JASPER live tests every popular complete domestic and import reman engine with recorded inspections of temperatures, oil pressure, vacuum and compression. Engines are black-light inspected to assure there are no oil leaks. JASPER’s testing is one of the many ways we assure your satisfaction.

Consistent quality is maintained through a continuous training program of technicians, many of whom are ASE certified, backed with statistical process control. Technicians are also JASPER certified to specific engines and job functions. Quality audits of all areas of the engine are scrutinized for cleanliness, surface finish quality, lubrication, clearance and wear patterns.

JASPER offers immediate availability on most popular reman engines. JASPER delivers availability through a large and growing network of branches throughout the country. JASPER quality remanufactured components are available from coast to coast and beyond.