JH BRAKE DRUMS - Brakes - Jensen Healey & Jensen GT Tech -

> Jensen Healey & Jensen GT Tech > Brakes > JH BRAKE DRUMS

Author

Post

Joenpate56
Member

Joined:	12-01-2015
Location:
Posts:	43
Status:	Offline

DOES ANYONE KNOW THE SIZE AND THREADS FOR THE BOLT THAT HOLDS THE BRAKE DRUM ON. I REPLACED THE WHEEL CYLINDERS AND FOUND THE BOLTS MISSING. DELTA DID NOT HAVE THEM. ARE THEY REALLY NECESSARY?
THANKS

t4brew
Member

Joined:	03-11-2010
Location:
Posts:	12
Status:	Offline

It looks like it is a 1/4"-28. I just ran a tap that size through the bolt hole in my '75 axle.
I am not sure about the length because my drums are not installed with any bolts.
You can get the needed length by measuring the depth of the drum and the axle mounting surface.
Looking at the parts catalog a washer was not used so it looks like a bolt length of around 1/2" would work.
My guess is that they are only needed to keep the drum from moving around until the wheel and lug nuts are torqued on.
After the wheel is installed the torque of the lug nuts will keep the drum in place.

Last edited on 02-15-2016 11:20 pm by t4brew

Joenpate56
Member

Joined:	12-01-2015
Location:
Posts:	43
Status:	Offline

THANKS t4brew. I didn't think they were necessary but I have been wrong before. i'll just leave them out

Spaceman
Member

Joined:	05-30-2017
Location:
Posts:	25
Status:	Offline

My 74 has the holes but no bolts, and no threads to put them in, looks like after chassis 14600 they stopped using them.

answerman
Member

Joined:	09-10-2012
Location:	Little Chute, Wisconsin USA
Posts:	435
Status:	Offline

Well, mine (16173) does have them threaded: 1/4-28 bolt, I believe it's a half inch length from memory.

And I agree: I don't think they are necessary, just keeps the drum in place when you remove the wheel.

Esprit2
Member

Joined:	05-01-2005
Location:	Minneapolis, Minnesota USA
Posts:	575
Status:	Offline

t4brew wrote:
My guess is that they are only needed to keep the drum from moving around until the wheel and lug nuts are torqued on. After the wheel is installed the torque of the lug nuts will keep the drum in place.Exactly. They're just assembly aids, and they have no real "braking" function. Omit them if you wish.

If you do delete them, then don't be surprised if a drum falls off when you remove a wheel. It can happen. Just put it back.

Regards,
Tim Engel

Last edited on 09-27-2017 10:14 pm by Esprit2