How to Seal and Protect the Inside of Your Engine

Posted: January 15, 2021 By: MattM

A smooth and clean engine inside and out can not only look good but can help with performance. Inside your engine it is normally rough cast and porous from the casting process. Oiling is a big part of your engine’s performance and lifespan so helping the oil get back to the pump as quickly as possibly is very important. Glyptal has long been the choice of professional and DIY engine rebuilders but many are worried about the difficulty of application Read the simple steps below to learn how to seal and protect the crankcase of and valley pan of your engine for better engine oiling.

  1. Clean engine of ALL oil residue in the area you’re working. Much like any paint, Glyptal needs a clean, oil-free surface that is dry to adhere to. This may require more time than application as you may need to flush and clean the inside of the engine many times. This is easiest when an engine is totally disassembled and has been hot tanked by a machine shop. This will heat and wash the oils out of an engine and leave it much cleaner.
  2. Smooth any major ridges, imperfections, or casting marks out of the surface where you’re coating. Glyptal can coat and seal minor imperfections and porous castings but large imperfections or jagged casting lines can be smoothed with a carbide burr to knock down any ridges or rough casting lines in the area you’re trying to seal up.
  3. Clean the engine again by using compressed air and PRE to clean and remove any sanding dust left from grinding down casting lines. This may take numerous rounds flushing to get all of the metal shavings out. A hot tank session one more time is preferred.
  4. Properly mix the Glyptal in the can making sure any solids in the bottom that have settled from sitting have been thoroughly mixed into the liquid.
  5. Using a stiff brush (we prefer our acid brushes); apply Glyptal over the entire area with a 50% overlap to make sure all areas are covered. 1 coat will cover and seal most modern engines but some antique engines with rougher castings may take 2-3 coats to smooth the inside of the engine.
  6. Let the coating cure in 70f+ degree temps at least overnight until it is dry to the touch before assembling the engine.

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