Frequently Asked Questions (FAQs)
1. What size are valve cover bolts?
Valve cover bolts are typically 1/4" coarse thread X 5/8" long. To determine the right length, measure the thickness of the valve cover, the gasket, and the washer under the head.
2. Will a valve cover leak if one bolt is missing?
Yes, if one valve cover bolt is missing, it can cause a significant leak. To solve the problem, it is recommended to replace the missing bolt.
3. Will tightening valve cover bolts stop a leak?
Tightening valve cover bolts may help stop a leak, but it is not a guaranteed solution. It is advised to gently cinch down the bolts or use a torque wrench. Over-tightening can result in cracked aluminum valve covers or warped steel valve covers.
4. Do valve cover bolts need sealant?
While valve cover gaskets do not necessarily require sealers or cements, it is common practice to glue the gasket to the valve cover. Sealant choices like Permatex No. 1, RTVs, or Permatex High Tack gasket sealant are suitable for this application.
5. Can I drive my car with a broken valve cover bolt?
Yes, you can drive your car with a broken valve cover bolt, but it is important to regularly inspect it. If left unrepaired, the broken bolt can lead to oil leaks and potential distortion or damage to the valve cover, requiring replacement.
6. What can a loose valve cover cause?
A loose valve cover can lead to a valve cover gasket leak, which can cause extensive internal damage to your engine and related systems. While it may not pose an immediate risk of harm, it can result in vehicle failure or overheating, requiring costly repairs.
7. Why should valve cover screws never be tightened excessively?
It is better to undertighten than overtighten valve cover screws. Excessive tightening can damage the gasket, strip the threads, or even crack the valve cover. It is recommended to use a torque wrench to ensure proper tightening.
8. Should valve cover gaskets be installed dry?
Valve cover gaskets should be installed clean and dry. Make sure to remove any oil and cleaning solvents from the bolt holes and ensure the cover's sealing groove is clean. For installation, all old sealing material should be removed.