Metric Mechanic 6mm HD Valve Spring Retainer Set(24) For BMW M52/54, (US)S50/52
The Metric Mechanic 6mm Heavy Duty Steel Valve Spring Retainer replaces the (weak) factory retainer, part number is 11.34.1.703.218 or 11.34.1.432.453. We have seen the factory retainers pull through on numerous S50 and S52 (US E36 M3) engines. The factory valve retainer can result in catastrophic engine failure. Our retainer only weighs 2 grams more than stock and it? We are also including a set (24). 030 shims to install under the factory spring perch. Please google Metric Mechanic for contact info. These are the results using a 2 ton press and a special fixture to test strength. MM 6mm Heavy Duty Valve Spring Retainer pulls through at 300 – 310 psi. BMW 6mm Valve Spring Retainer pulls though at 165 – 185 psi.
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