A VM cylinder head checking service is offered free of charge. This includes a visual examination for overheating damage, distortion, corrosion, internal cavitation, cracking, loose combustion chambers and valve seats.
If it appears that the cylinder heads are good enough quality to be reused then we go on to pressure test them and remove the valves to examine them and check the valve seats. If the cylinder heads pass the pressure test, the valves are refaced and the valve seats are recut and lapped in and if the customer specifies, the heads can be skimmed (although VM Motori factory advises against skimming), cleaned and reassembled.
Aluminium cylinder heads, whether manufactured by VM or any other company, are prone to internal cracking and cavitation through oxidisation and we have the experience to determine whether the reuse of cylinder heads as opposed to replacing with new will provide an effective long lasting repair. Some engine re-manufacturing companies claim they can offer a cylinder head reconditioning service but you have to have the experience with VM cylinder heads to establish that it is going to work and last.
Our expertise on the VM engine enables us to assess whether the engine has been over heated or not as we know exactly where to look for cracking, corrosion and internal cavitation, all of which contribute towards thinning of the cylinder head casting which can lead to coolant loss and cooling system pressurisation. The information above enables us to advise our customers about the risks involved in reusing cylinder heads which have been over heated or whether they are suitable for reuse.