Camplate problems
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Road Warrior
Joined: Sep 2008
Posts: 1,465
Likes: 16
From: Nor Cal
Camplate problems
I have a stripped out bolt a hole on my engine case, the one that attaches the camplate where the dowel pin is.The thread I need to repair had a Heli Coil that failed.
I was planning on using a Big-Sert 5420 kit for the repair.
The following is part of a email I sent Time-Sert;
The diameter of the hole is now approximately 0.317. According to the the specifications for the 5420 kit the drill bit is 0.307 dia. and the tap is 0.359 dia. Will I have enough material to hold the insert? The material is aluminum. The bolt hole I'm repairing is counterbored for a Dowel Pin, which the bolt passes through. I plan on replacing the bolt with a stud, which I'll use permanent red threadlocker to lock the insert & stud in place. I'll reinstall the Dowel Pin, which will partially cover the counterbored lip of the insert.
Time-Sert's response;
No we don't want the failed hole to be larger than the drill in the kit .307 inches. Sorry we can't be of much help on this.
I'm thinking that 0.010" shouldn't make that much of a difference. The hole tapers to a smaller diameter towards the bottom, I can't accurately measure it. Time-Sert does offer inerts in different lengths that are not listed.
My other options that I know of, are is a E-Z Lok insert or KeenSert, which both require a 3/8-16 tap. I don't' know if that would interfere with the counter bore for the dowel pin. Another idea would be a std. 5/16-24 Time-Sert & use a 5/16-24 -1/4-28 or a 5/16-24 - 5/16-24 stud, but I'm not having any luck finding either of those sizes.
I'm looking for ideas, Thanks
I was planning on using a Big-Sert 5420 kit for the repair.
The following is part of a email I sent Time-Sert;
The diameter of the hole is now approximately 0.317. According to the the specifications for the 5420 kit the drill bit is 0.307 dia. and the tap is 0.359 dia. Will I have enough material to hold the insert? The material is aluminum. The bolt hole I'm repairing is counterbored for a Dowel Pin, which the bolt passes through. I plan on replacing the bolt with a stud, which I'll use permanent red threadlocker to lock the insert & stud in place. I'll reinstall the Dowel Pin, which will partially cover the counterbored lip of the insert.
Time-Sert's response;
No we don't want the failed hole to be larger than the drill in the kit .307 inches. Sorry we can't be of much help on this.
I'm thinking that 0.010" shouldn't make that much of a difference. The hole tapers to a smaller diameter towards the bottom, I can't accurately measure it. Time-Sert does offer inerts in different lengths that are not listed.
My other options that I know of, are is a E-Z Lok insert or KeenSert, which both require a 3/8-16 tap. I don't' know if that would interfere with the counter bore for the dowel pin. Another idea would be a std. 5/16-24 Time-Sert & use a 5/16-24 -1/4-28 or a 5/16-24 - 5/16-24 stud, but I'm not having any luck finding either of those sizes.
I'm looking for ideas, Thanks
Last edited by DanDman; Feb 20, 2019 at 02:31 PM.
HDF Community Team
Joined: Jun 2006
Posts: 12,763
Likes: 2,597
From: san antonio
I repaired that hole once with a 3/8 x -16 tap; it did not interfere with the dowel pin counter bore. I did have to ream the hole in the cam plate for the 3/16" bolt to pass through. I would normally have heli-coiled and used a 5/16-24 stud to make the repair but was in a time crunch.
Seasoned HDF Member
Joined: Mar 2010
Posts: 38,307
Likes: 6,326
From: Honah Lee
I repaired that hole once with a 3/8 x -16 tap; it did not interfere with the dowel pin counter bore. I did have to ream the hole in the cam plate for the 3/16" bolt to pass through. I would normally have heli-coiled and used a 5/16-24 stud to make the repair but was in a time crunch.
Stellar HDF Member
Joined: May 2015
Posts: 2,091
Likes: 304
From: mid Michigan
When I repaired mine the threads just cut into the counter bore for the insert. It left plenty for the dowel, so it was probably the 3/8 O.D. thread.
I'm using 1/4 bolts still with the insert, should hold up fine w/ the steal insert.
I'm using 1/4 bolts still with the insert, should hold up fine w/ the steal insert.
Last edited by xcbullet; Feb 24, 2019 at 08:34 AM.
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