Description
When you’re deep into an engine tear-down and the old gasket crumbles in your hands, you need something that’ll seal tight and stay sealed. Permatex Ultra Black is the go-to choice for engine rebuilds and repairs because it handles the extreme heat and pressure that farm equipment dishes out. This isn’t your basic silicone—it’s engineered to withstand the punishment of hard-working diesel engines.
What You’re Getting
- High-temperature formula that won’t break down under engine heat or oil exposure
- Forms a permanent, flexible seal that moves with thermal expansion and vibration
- Oil and coolant resistant—won’t soften or wash out like cheaper sealants
- Ready-to-use formula that cures to a tough rubber gasket in just 24 hours
Built for Real Farm Work
This gasket maker shines on oil pans, valve covers, timing covers, and water pump housings where you need a seal that absolutely won’t leak. Perfect for older tractors where finding original gaskets is tough, or when you’re doing field repairs and need something reliable. Works on gas and diesel engines, from utility tractors to big row-crop machines.
Made to Last
Ultra Black is formulated to handle continuous temperatures up to 500°F with intermittent spikes even higher—more than enough for the hottest-running engines. The flexible cure means it won’t crack when parts expand and contract with temperature changes, and it resists the chemicals in modern oils and coolants.
Installation Notes
Clean both surfaces thoroughly with brake cleaner or degreaser before applying. Apply a continuous 1/8-inch bead and assemble parts within 5 minutes. Let it cure for at least an hour before adding fluids, and give it a full day to reach maximum strength. Keep the tube tip clean between uses to prevent clogging.
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