Sealing Flex plate bolts

Tiny
RPMAGOO
  • MEMBER
  • 1989 FORD MUSTANG
  • 5.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 500 MILES
I recently installed a new 302 Crate Motor with a AOD automatic transmission, and failed to seal the flex plate bolts. The bolts are 7/16-20 and were torqued to 80 ft. Lbs. I understand that oil may leak out around the bolts. Will this be a major leak or just a nuisance?
Do you
have the same problem?
Yes
No
Monday, April 15th, 2019 AT 12:47 AM

9 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good morning,

There is no sealer required for installing these bolts. They just et torqued to 80 lbs.

Only use new bolts. Never reuse these bolts.

Roy
Was this
answer
helpful?
Yes
No
Monday, April 15th, 2019 AT 4:08 AM
Tiny
RPMAGOO
  • MEMBER
I Understand that, on this motor, the holes are not blind holes. They are drilled through, and go into oil, inside the crank case. It's a BluePrint crate motor, and they waned about the potential problem. That's the reason for my concern.
Was this
answer
helpful?
Yes
No
Monday, April 15th, 2019 AT 4:39 AM
Tiny
ASEMASTER6371
  • EXPERT
Okay, then yes. The stock cranks do not require a sealer.

Your does need thread locker. I would use lock tight red in color. That's what we used for cooling system bolts that went into coolant passages.

Roy
Was this
answer
helpful?
Yes
No
Monday, April 15th, 2019 AT 4:41 AM
Tiny
RPMAGOO
  • MEMBER
The motor is in the car. Everything is all hooked up. I'm not sure if we can pull the transmission back far enough to take care of the problem, without pulling the motor, and transmission as a unit. Either way it's a big job. If I live with it, and do nothing, do you think that the leak will be a major one, or just a nuisance?
Was this
answer
helpful?
Yes
No
Monday, April 15th, 2019 AT 4:47 AM
Tiny
ASEMASTER6371
  • EXPERT
More like a nuisance leak. It is not a pressure point.

Roy
Was this
answer
helpful?
Yes
No
Monday, April 15th, 2019 AT 4:51 AM
Tiny
RPMAGOO
  • MEMBER
Thanks. I'll live with it, and see what happens. Have a good day.
Was this
answer
helpful?
Yes
No
Monday, April 15th, 2019 AT 4:52 AM
Tiny
ASEMASTER6371
  • EXPERT
You as well.

Always glad to help.

Roy
Was this
answer
helpful?
Yes
No
Monday, April 15th, 2019 AT 5:03 AM
Tiny
RPMAGOO
  • MEMBER
Got the motor running, set timing etc. Ran the motor for a few minutes watching oil pressure, looking for leaks etc. When we shut the motor down, I got under, while the car was still on jack stands. Bad news, there was quite an accumulation of oil in the bottom of the transmission bell. I feel that we must pull the transmission, and seal the flex plate bolts. This is a Ford AOD on a 302 in a 64 Falcon Sprint. I feel that we can pull the transmission without removing the engine. We can just pull the transmission back far enough to get at the flex plate bolts. Of course we must remove the drive shaft, mounts, starter, cables, dip stick tube etc, and loosen the motor mounts to tilt the back of the motor down enough to get at the two top transmission mount bolts. What's your opinion, on this? Thanks, Dick
Was this
answer
helpful?
Yes
No
Wednesday, April 17th, 2019 AT 9:26 PM
Tiny
ASEMASTER6371
  • EXPERT
Yes, use two long guide bolts to back up the transmission to gain access to the flex plate.

Roy
Was this
answer
helpful?
Yes
No
Thursday, April 18th, 2019 AT 12:06 AM

Please login or register to post a reply.

Recommended Guides