Worn threads on Carb body.
Thread Starter
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Tuned
Joined: Feb 2004
Posts: 339
Likes: 3
From: Saudia Arabia
Worn threads on Carb body.
Hi folks:
some of the screws on my 1 brl YFA Carter carb came loose and cannot be tightened or holding torque.
Do I have to take the carb to a machine shop or is there other simple idea to fix them worn threads in the carb body. I heared there is something like locktite blue, any info on such compound.
some of the screws on my 1 brl YFA Carter carb came loose and cannot be tightened or holding torque.
Do I have to take the carb to a machine shop or is there other simple idea to fix them worn threads in the carb body. I heared there is something like locktite blue, any info on such compound.
Old School Hot Rodder
Joined: Feb 2006
Posts: 6,472
Likes: 11
From: Exmore, VA
They call them heli-coils. I believe the threads are 10-24 on the YFA. You are experiancing a very common problem with thes carbs, the engine vibration causes the screws to work loose, eventually completely stripping the holes. Carter used a strange looking "prevailing torque" screw that looks like it has been stepped on (it appears triangular when you look at the end). This was a fairly good idea, but... the pot metal (zinc alloy) body creeps from heating and cooling and the screws start to loosen. Engine starts to run rough, shakes the carb worse, they loosen more. You get the picture. If you can get something in the carb body to hold them, I used to always loctite them on any I rebuilt to prevent problems.
Moderator
Joined: Aug 2002
Posts: 6,104
Likes: 384
From: Southern California
Yes.....they even make thread chasing screws that would likely work very, very well.
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Thread Starter
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Tuned
Joined: Feb 2004
Posts: 339
Likes: 3
From: Saudia Arabia
Thank you all for the info, I knew the carb body metal is soft, that when you over torque the screws you damage the threads in the body.
I will try to buy the tap and die set, and also look for the lock tight compound. I wash someone tell me some good brands of the lock tight.
I will try to buy the tap and die set, and also look for the lock tight compound. I wash someone tell me some good brands of the lock tight.
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Thread Starter
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Tuned
Joined: Feb 2004
Posts: 339
Likes: 3
From: Saudia Arabia
Loctite is a familiar name when I was working as an Aircraft mechanic,we used to put that compound on engine bolts threads before installation just to make bolts removal easy next time it needs to be removed.
But the loctite we are talking about is to lock the screws in place, was it the same or different?.
But the loctite we are talking about is to lock the screws in place, was it the same or different?.
Moderator
Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
This is what I was referring to : Amazon.com: Loctite Form-A-Thread repair kit, grey - 4.8ml: Sports & Outdoors
