mlochala
Active Member
- Joined
- March 18, 2010
- Messages
- 56
- Reaction score
- 4
- City, State
- Amory, MS
- Year, Model & Trim Level
- 1998 Mountaineer AWD
I have a 1998 Mercury Mountaineer with the 5.0L V8, formerly an AWD.
I have broken the two motor mount studs on the passenger side of the motor. Can anyone tell me what size and thread they are? I would appreciate it very much.
UPDATED 12/28/2020: After successfully replacing these broken studs, I will share their size for the benefit of anyone else who might need this info. The studs on my Mountaineer were 7/16-14 reduced to 3/8-16. The 7/16-14 threads into the engine block and is 1-1/4" in length. The other end is also 1-1/4" in length and is used for bolting line supports or brackets to the motor. The overall length of these studs is 2-1/2".
Replacing them wasn't very difficult, not nearly as bad as I thought it would be. I loosened the right motor mount and then placed a jack under the motor to support it. After completely removing the right motor mount, I had a little more access to the broken studs, which were broken flush in the engine block. I was able to get the forward bolt out with a sharp punch, gently tapping it in a counter-clockwise motion until I had enough protruding enough to remove it with my fingers. The rear bolt was not accessible with a punch, but with an extension, I used a 1/4-20 LH drill bit in a 12" extension and turned it out with a cordless drill. I replaced both with grade 8 bolts.
I have broken the two motor mount studs on the passenger side of the motor. Can anyone tell me what size and thread they are? I would appreciate it very much.
UPDATED 12/28/2020: After successfully replacing these broken studs, I will share their size for the benefit of anyone else who might need this info. The studs on my Mountaineer were 7/16-14 reduced to 3/8-16. The 7/16-14 threads into the engine block and is 1-1/4" in length. The other end is also 1-1/4" in length and is used for bolting line supports or brackets to the motor. The overall length of these studs is 2-1/2".
Replacing them wasn't very difficult, not nearly as bad as I thought it would be. I loosened the right motor mount and then placed a jack under the motor to support it. After completely removing the right motor mount, I had a little more access to the broken studs, which were broken flush in the engine block. I was able to get the forward bolt out with a sharp punch, gently tapping it in a counter-clockwise motion until I had enough protruding enough to remove it with my fingers. The rear bolt was not accessible with a punch, but with an extension, I used a 1/4-20 LH drill bit in a 12" extension and turned it out with a cordless drill. I replaced both with grade 8 bolts.
