markelliott
Member
On the T-Bolt 390, Lycoming will install their 31c-16 studs (2") and they should have a nominal height above pad of 1.25-1.31". Unfortunately mine were run into 1.19-1.21".
In any case, the Hartzell governor, gasket, washer, lock washer and nut add up to 1.346.
You will not have a full thread out of the nut.
The next stud size is a 31C-17 - .125 longer than the -16 and will need to be ordered and changed out.
Maybe ask and see if they would install the -17 studs during the build?
I have a feeling many previous builders just installed as is, changed to the thinner washer, or ?
Lycoming customer service has been very good, FYI
In any case, the Hartzell governor, gasket, washer, lock washer and nut add up to 1.346.
You will not have a full thread out of the nut.
The next stud size is a 31C-17 - .125 longer than the -16 and will need to be ordered and changed out.
Maybe ask and see if they would install the -17 studs during the build?
I have a feeling many previous builders just installed as is, changed to the thinner washer, or ?
Lycoming customer service has been very good, FYI