Seized throttle shafts in 4150
- Thread starter Mike 340
- Start date
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Have you it let it sit soaking in a solution for several days?
Have you taken the blades off and tried tapping the shafts, I use PB power blast.
hot plate if it is the shaft inside the base that are stuck
Not close to the temp required to get them loose.
Carefully heat with a small torch while tapping lightly with a small hammer.
If you are not trying to save the shaft?
There is a process where you use Alum and heat
It dissolves steel but doesn't touch aluminum.
Because carbs are not pure aluminum I would test a throwaway carb in the solution
There is a process where you use Alum and heat
It dissolves steel but doesn't touch aluminum.
Because carbs are not pure aluminum I would test a throwaway carb in the solution
Id try Evaporust
Butane pencil torch (more precise/less likely to damage), freezer a half hour, clamp base lightly in wood with one shaft accessible and vertical, heat only the base bosses/tubes where the shaft passes through, keep torch moving around to spread heat instead of melting base, alternate heat with aerosol penetrant on the shaft above the bosses to run down, blow out flames. Rotate shaft back and forth, not just one direction. Stop after 15 min, repeat entire process if not out and for the other shaft.
Find someone with a Sonic cleaner works every time
What solution is in the sonic cleaner. We use (Super Clean) mixed strong. Make sure it is hot and leave it in for at least two 20 minute cycles
Fluid Film is not a penetrating oil. I would try something like PBlaster or Deep Creep.
I've tried that on all kinda stuff and for me, it flat doesn't work.
gzig5
Well-Known Member
Kroil and if not available then PB Blaster. Heat on the dissimilar metals should cause different expansion rates which will break it loose. Helps the penetrating oil get in too. I’d torch it or just bake in an oven at 250-300 degrees and then let cool.
May not be worth saving if you can't free it up a little with penetrating oil and tap it out.
I take a small hammer and punch and tap the throttle shafts back and forth while keeping them soaked with penetrating oil. So far, I've freed up every one I ever tried like that. Just wrap a couple of shop rags around the base plate and clamp it in a vise.
Makes sense and a good sized punch to not flare the shaft ends.
I use a roll pin punch. They have rounded ends.
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