Need help unscrewing the lens cap off my UK C4 light

[crzyfish]

It won't budge. It still works, the light is strong. I haven't taken the light into the water in years, so I doubt it's salt locking up the threads. I lubed the gasket with grease before screwing down the lens but now it won't come off.

Things I've tried. Brute force using hands, feet, and two people trying to torque it off. Strap wrench, I have a rubber strap wrench that I tried to use to remove it - it just won't budge.

I thought about a heat gun/hair dryer or steam. Any ideas?

 

[chris kippax]

65 degree celsius water, a short soak and try again?

 

[Jonny Wishbone]

when you soak it in hot water first try to just soak the head so it will be the first to expand or swell a bit. this might be enough to get it free....

 

[fmerkel]

Body in a padded vise oriented so the handle can't twist. Take a rubber strap wrench to the head. Best not to leave that style of light closed for that long. It gets seriously sticky.

 

[tursiops]

Are there batteries in it? If so, they may have died and outgassed and the head is being held on by internal pressure. Try pressing the head toward the body while turning.....like some medicine bottles.

 

[crzyfish]

I’ll try the heated water soak with a padded vise and strap wrench but I’ll use a non rubber strap - the rubber stretches and slips.

Yes, there are batteries still in there but it’s still lights up. I agree the gas from the batteries are most likely causing pressure build up.

I sent a message to UKinetics for suggestions, too.

 

[lucca brassi]

MasterPro Rubber strap oil filter wrench 6 inch | Euro Car Parts IE

gentle!!!!!

if not work soak whole lamp in vegetable oil over night , then rinse surface , dry it and try again

but i think oil filter wrench should go in first move , you handle it in right direction ??

hot water in that case is no solution .

 

[crzyfish]

A table vise, 2" nylon strap connected to an iron bar + brute force = movement. It was definitely off gassing from the batteries. You can smell that weird odor. The batteries were reading 1.39V so they were on the decline and needed to be changed out. Thanks, Everyone!