Wideframe oil seals for the crankshaft are available in two different versions:
- Round cut-out for wideframe engines (material thickness of the sheet metal carrier 0.5mm)
- Square cut-out for largeframe engines (material thickness of the sheet metal carrier 0.8mm)
The 0.5mm version suitable for wideframe is only available in no-name quality. The shaft seals fit and there are no problems with distorted bearings.
PROBLEM WIDEFRAME MOTORS
The significantly higher quality BGM Pro and Corteco shaft seals are only available with a 0.8mm thick sheet metal jacket (for safety reasons). If these are installed in a wideframe engine, the crankshaft bearings become distorted, leading to bearing damage.
SOLUTIONS WIDEFRAME ENGINES
a) The circumferential bead in the oil seal is pressed flat, reducing the installation height of the oil seal plate by approx. 0.3 mm. The bearings then run freely.
b) The BGM Pro bearing set with special ball bearings. Here, the bearing shoulders have been machined to size to ensure tension-free installation of the crankshaft bearing. The set includes the matching high-quality ethanol-resistant BGM Pro FKM/Viton® oil seals.
(US211118)
