cylinder head restoration

Cylinder Head Restoration

Pre-70 BMW Heads
Materials

Guides: Custom machined Ampco 45. Valve guide ID and OD diameters are concentric with .0005" (.013mm) TIR. Shown below are custom R69/R69S and R50/R60 valve guides.

Valve seats: Hi-Chrome SAE10b/5 globular perlite and tempered martensite with a uniform dispersion of chromium carbides.

German sourced valves, springs, collars and retainers. Alternative German or Swiss high quality replacement parts are used when applicable.

Process

Heads are inspected, disassembled, hot tank cleaned and again inspected.

The heads are media blasted.

All critical dimensions and components are again inspected.

Valves are ground (as required) on a Kwik-Way valve grinder which has a spindle chuck TIR at .0005" (.013mm) or less.

Valve bores (ID & OD) are machined using a precision Sunnen honing machine and tooling.

Seats features (both OD and valve interface angles) are processed with all carbide tooling as applicable ona Rottler SG7 machine

Heads are processed in a commercial ultrasonic cleaner and assembled

Post-70 BMW Heads

Materials

German sourced standard, first and second overize guides.

Valve seats: Hi-Chrome SAE10b/5 globular perlite and tempered martensite with a uniform dispersion of chromium carbides.

Factory BMW valves, springs, collars and retainers. Alternative German or Swiss high quality replacement parts are used when applicable.

Process

Heads are inspected, disassembled, hot tank cleaned and again inspected.

The heads are media blasted.

All critical dimensions and components are again inspected.

Valves are ground (as required) on a Kwik-Way valve grinder which has a spindle chuck TIR at .0005" (.013mm) or less.

Valve bores (ID & OD) are machined using a precision Sunnen honing machine and tooling.

Seats features (both OD and valve interface angles) are processed with all carbide tooling as applicable on a Rottler SG7 machine.

Heads are processed in a commercial ultrasonic cleaner and assembled

Equipment List

Rottler SG7 Seat & Guide Machine

Sunnen MBB-1660-D Honing Machine

Kwik-Way CV1397 Valve Grinder

Rockwell 21-100 Milling Machines

South Bend 9" Model A Custom Built Lathe

Miller Mig and Tig Welders for fin and thread repair

Metrology Equipment: Sunnen, Starrett, Mahr, Mitutoyo, and others.

E-mail for more info

Index Page

	Guides: Custom machined Ampco 45. Valve guide ID and OD diameters are concentric with .0005" (.013mm) TIR. Shown below are custom R69/R69S and R50/R60 valve guides.
	Valve seats: Hi-Chrome SAE10b/5 globular perlite and tempered martensite with a uniform dispersion of chromium carbides.
	German sourced valves, springs, collars and retainers. Alternative German or Swiss high quality replacement parts are used when applicable.

	Heads are inspected, disassembled, hot tank cleaned and again inspected.
	The heads are media blasted.
	All critical dimensions and components are again inspected.
	Valves are ground (as required) on a Kwik-Way valve grinder which has a spindle chuck TIR at .0005" (.013mm) or less.
	Valve bores (ID & OD) are machined using a precision Sunnen honing machine and tooling.
	Seats features (both OD and valve interface angles) are processed with all carbide tooling as applicable ona Rottler SG7 machine
	Heads are processed in a commercial ultrasonic cleaner and assembled

	German sourced standard, first and second overize guides.
	Valve seats: Hi-Chrome SAE10b/5 globular perlite and tempered martensite with a uniform dispersion of chromium carbides.
	Factory BMW valves, springs, collars and retainers. Alternative German or Swiss high quality replacement parts are used when applicable.

	Rottler SG7 Seat & Guide Machine
	Sunnen MBB-1660-D Honing Machine
	Kwik-Way CV1397 Valve Grinder
	Rockwell 21-100 Milling Machines
	South Bend 9" Model A Custom Built Lathe
	Miller Mig and Tig Welders for fin and thread repair
	Metrology Equipment: Sunnen, Starrett, Mahr, Mitutoyo, and others.