Is everyone doing the pre-flight propeller blade inspection?
It is very important to know if the blade twist and blade movement are within the allowable limits.
It is important because excess blade movement will cause grease to leak past the blade grease seal.
During the propeller assembly, excess grease is applied to the bearing race to hold the ball bearings and bearing spacers in place. This excess grease ends up between the bearing race and the blade grease seal. When the engine is running, the grease naturally flows outward towards the blade grease seal. The hotter the propeller hub (engine oil temperature), the easier the grease will flow and the easier it is for the grease to get past the blade grease seal.
The date of manufacturer of your MT Propeller is also a consideration. The blade grease seal was changed in early 2003. All of the propellers built prior to 2003 are required to have the new grease seal configuration installed when the propeller is overhauled.
A grease leak is a symptom. This, by itself, is not a problem. (The seal change in 2003 was done to eliminatate the annoyance of excessive grease leakage.)
If there is a grease leak and excess blade movement, then there is a problem.
If you feel you have a problem, and you purchased your propeller from a sales/service distributor, then call them.
Otherwise, feel free to call me in California (805) 795-5377, or MT Propeller USA in Florida (386) 736-7762.
Regards,
Jim Ayers