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free seized up forks

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free seized up forks
Started at 10:40pm on the 5th January, 2019 by enfield_trials
enfield_trials Subject: free seized up forks
Hi Guys
I have 1950s bullet frame with front forks seized up. the bike seems to be not have any humanly contact in decades.
this is basically back yard built. so have only basic toolkit in hand.
my idea was to filled the forks with diesel for few days in up side down position.and then may start hitting with mallet

so removed bottom stud nut and put the frame up side down. the tried to filling it with diesel and it just went to hollow stud filled up quickly. I haven't tried opening top plug screw .. yet. seem bit seized up as well. I dont have any blow torch or hot air gun to loosen things up dont want to damage the screw.

appreciate if you better ideas/advice i will try to share some pictures tomorrow ..
Regards ET
Posted: 10:40pm 5th January, 2019
Mark M Subject: free seized up forks
Good idea to fill with Diesel. The snag with filling from the bottom stud is that the narrow hole fills up with dried grease and rust and won't allow much liquid in. You'll have to take the top plug out to fill it properly. Go and buy a MAP (methane and propane) gas torch from a DIY store, not very expensive but in any case having seen pictures of the parts you are working on you will need it more than once, trust me!

REgards, Mark
Posted: 08:47am 6th January, 2019
enfield_trials Subject: free seized up forks
Hi Mark Thanks for your advice. I agree what you said. i will look for MAPP torch .. Regards ET
Posted: 11:03am 6th January, 2019
stinkwheel Subject: free seized up forks
Once the bottom nut is off, isn't it just rust/seal friction holding it? The bottoms ought to slide-hammer off?

A 50:50 mix of paraffin and ATF makes a good penetrating oil.
Posted: 03:53pm 7th January, 2019
Mark M Subject: free seized up forks
Stinkwheel, I've had this problem with a set of Crusader forks. The alloy internal corrosion expands into the already small gap with the steel stanchion locking the two together. Because you've got quite a lot of contact area and only the top and bottom of the slider to inject lubricant into the gap, it takes quite a while to free the two parts. I found regular sessions of heat to expand the alloy followed by adding as much penetrating oil as would go in eventually freed it. Hitting the slider just damages the alloy and even holding the slider in the vice is tricky as it is difficult to hold a tube firmly. I found re-attaching the wheel spindle clamp and using a half inch bar as a tommy bar helped me to (eventually) get the stanchion turning. Once you've got a little movement it's going to work, you just need patience. I left the two stanchions by the bench vice and gave them the treatment whenever I'd got time left after doing other jobs!

REgards, Mark
Posted: 04:45pm 7th January, 2019
vince Subject: free seized up forks
Hi, you will have to fill these from the top, inverted any fluid will come out through the filter vent. Unlike later forks which are sealed, 1950 forks vent to atmosphere as they operate. Vince
Posted: 06:43pm 7th January, 2019
gnasher Subject: free seized up forks
I have just had the same with my barn find, i fitted a bar to the axle holding clamps and and freed them off, once i got them to spin it freed them vertically as well.
Posted: 06:45pm 7th January, 2019

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