On a hybrid vehicle’s air conditioning system that utilizes a high voltage electrical compressor, can only the oil specified by the vehicle manufacturer should be used in the compressor or is PAG oil is acceptable for use in an electric vehicle’s compressor?
As the weather warms, more and more of your customers will be switching over their HVAC control settings to “max A/C”. If the system doesn’t respond by blowing that refreshing cool air into their faces, they will show up at your door to find out why. When faced with...
Description When choosing an oil change interval for a car or truck, some technicians follow the guidelines in the owner’s manual, while others will suggest a conservative figure such as every 3,000 miles. Pete Meier explains how vehicle usage and oil/filter quality...
Nearly every conceivable version of the internal combustion engine has made its way to the Indy 500. But it was a 1931 entry of a rather unusual type that made it into the record books as the first to complete the entire 500-mile race without a pit stop. That entry...
Description Technician A is preparing to recover the refrigerant from a customer’s vehicle. All of the below are steps he should take when performing this service EXCEPT: A) Test for the presence of sealant in the vehicle systemB) Identify the type of refrigerant the...
Few names in automotive design carry the influence and legacy of Giorgetto Giugiaro. With a career that spans more than six decades, Giugiaro’s designs have touched nearly every corner of the automotive world—from exotic supercars and world-beating rally machines to...
Description Torque-to-yield fasteners are designed to deform during installation to ensure a secure connection. If a TTY fastener looks to be in good shape after removal, can it be reused? Pete Meier explains why these single-use bolts should always be replaced for...
Recently, I had the opportunity to take my car to a body shop (it’s a long story). Once the work was done and I was checking out, the office manager mentioned to me that they would be sending me a customer satisfaction survey and encouraged me to fill it out. Then she...
Description Technician A has just completed a running compression test using a mechanical compression gauge. Technician B says that the test is used to check the volumetric efficiency of the engine. Technician A says that the higher-than-expected readings indicate a...
Removing valves from a cylinder head should be done carefully if you have a notion to reuse the valves, springs, collars, and keepers. A spring compressor is the right tool for the job.
That said, in my salvage yard days, I learned a trick I still use today if I’m stripping a head for scrap. It’s the fastest method in the world, hands down. I’m not gonna say I’ve never pulled this trick on a customer car, but I will say I don’t use it often nowadays.
Pull the head and the cam(s) if it’s an overhead cam engine. Set the head on a non-marring surface with the valve stems pointed up.
Select a socket with an OD that’s a little smaller than the OD of one of the valve keepers.
Flip the socket’s open end onto the keeper and whack the end with a deadblow hammer.
Lift the socket up carefully, collect the keepers, collar, and spring. Lift the head and fish the valve out of the combustion chamber. (Keep ‘em together and labeled if you’re gonna put these parts back into the head or you’re lapping valves.)
If you’re quick and you’re not worried about retaining parts, you can strip down a four-valve four-cylinder head in under a minute. Watch your hands and peepers!
The articles and other content contained on this site may contain links to third party websites. By clicking them, you consent to Dorman’s Website Use Agreement.
Shop Press Comment Policy
Participation in this forum is subject to Dorman’s Website Terms & Conditions. Please read our Comment Policy before commenting.
When you login first time using a Social Login button, we collect your account public profile information shared by Social Login provider, based on your privacy settings. We also get your email address to automatically create an account for you in our website. Once your account is created, you'll be logged-in to this account.
DisagreeAgree
Connect with
I allow to create an account
When you login first time using a Social Login button, we collect your account public profile information shared by Social Login provider, based on your privacy settings. We also get your email address to automatically create an account for you in our website. Once your account is created, you'll be logged-in to this account.