Leaky Cap Vent
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More Turbo
Joined: Apr 2013
Posts: 661
Likes: 21
From: Waukesha WI
Leaky Cap Vent
I bought a FORD cap on ebay for $100. I was warned that the roof vent
leaks. He was correct. I snugged up the acorn nuts on the inside.
It still leaks. What should I make a new gasket out of?
leaks. He was correct. I snugged up the acorn nuts on the inside.
It still leaks. What should I make a new gasket out of?
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
EPDM rubber for the gasket and a thin smear of RTV.
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
The main properties of EPDM are its outstanding heat, ozone and weather resistance. The resistance to polar substances and steam are also good. It has excellent electrical insulating properties. It has good resistance to ketones, ordinary diluted acids and alkalines.
EPDM rubber is used in seals (for example it is used in cold-room doors since it's an insulator as well as in the face seals of industrial respirators in automotive paint spray environments, where silicone must be avoided). EPDM is also used in glass-run channels, radiators, garden and appliance hose, tubing, pond liners, washers, belts, electrical insulation, vibrators, O-rings, solar panel heat collectors and speaker cone surrounds. It is also used as a medium for water resistance in electrical cable-jointing, roofing membranes (since it does not pollute the run-off rainwater, which is of vital importance for rainwater harvesting), geomembranes, rubber mechanical goods, plastic impact modification, thermoplastic, vulcanizates, and many other applications.
The most common use however is probably in vehicles. It is used in door seals, window seals, trunk seals, and sometimes hood seals. Frequently these seals are the source of noise due to movement of the door against the car body and the resulting friction between the EPDM rubber and the mating surface (car painted sheet metal or glass). This can be alleviated using specialty coatings that are applied at the time of manufacture of the weather seal. Such coatings can also greatly increase the chemical resistance of EPDM rubber. Some vehicle manufacturers also recommend a light application of silicone dielectric grease to weatherstripping to reduce noise. Other uses in vehicles include cooling system circuit hoses where water pumps, thermostats, EGR valves, EGR coolers, heaters, oil coolers, radiators and degas bottles are connected with EPDM hoses; as well as charge air tubing on turbo charged engines to connect the cold side of the charge air cooler (intercooler) to the intake manifold.
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
EPDM is used by roofing companies so that would be my first stop. The next alternative is garage door seals but that means it's narrow and has to be installed in pieces to seal up the roof vent. Alternatively, pond liners, at least the good ones, are also made of EPDM. Call around to see if anyone has some scrap... ya might also wanna use it to seal the shell to the bed rails.
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More Turbo
Joined: Apr 2013
Posts: 661
Likes: 21
From: Waukesha WI
Thankyou for the info. I have some left-over membrane from our near-flat roof job.
FORD caps have the rubber already fastened to the bottom edge of the cap.
Tonight I'm removing the back tailgate. Once laying flat on the ground I can remove the
2 tiny nuts that hold the handle in place. We bought the cap without a key.
Any suggestions ? The entire handle goes to the lock shop.
FORD caps have the rubber already fastened to the bottom edge of the cap.
Tonight I'm removing the back tailgate. Once laying flat on the ground I can remove the
2 tiny nuts that hold the handle in place. We bought the cap without a key.
Any suggestions ? The entire handle goes to the lock shop.
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