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Taking the measure of a valve jobBy Jim Tapp, Goodson Tech Services Manager
Valve guides support the valves and help keep them running cool. If the guides are worn, you'll have increased oil consumption and decreased cooling of the valves. Remember 25% of a valve's cooling depends on heat transfer from the stem to the valve guide. Worn guides will also allow engine oil to be drawn past the valve stem, resulting in excessive oil consumption. Oil drawn past the valve guides can coke on the port side of the valves causing reduced air flow, exhaust or intake, compromising engine performance. Oil build up (coking) can also accumulate in the combustion chamber and on the piston top. Results here could be severe including a definite drop in performance and possibly mechanical damage as a result of pre-ignition. Pre-ignition being the glowing edges of carbon deposits igniting the incoming fuel mixture before the properly timed ignition spark. Worn guides can also lead to another engine failure. Since the guides support and center the valves, a worn guide will allow the valve to flex as it closes against a now loosely aligned valve seat. After just so long, this can cause the head to break off the valve stem, damaging piston, cylinder head and cylinder block. Read the whole story >>
Level your level before you level your work A lot gets said about leveling your machines on a regular basis, but its just as important (if not more) to check the level of your level regularly too. After all, if your level isn't accurate, your machine won't be either. Here's a simple, step-by-step procedure you can use to calibrate (or level) your level:
For more information, check out Calibrating and Maintaining your Precision Level in our Tech Library.
Techxperts™ Top Picks
When the newsletter editor asked me what tool I would like to feature this month as our top pick, I instantly thought of our Universal Spring Pad Cutter. It's such a versatile tool, anyone who is using a 3-angle cutting system should have one. Obviously, the Universal Spring Pad Cutter cuts spring pads but it has one big advantage over the other spring pad cutters out there. It's adjustable. If you need a custom size spring pad that's not available in a dedicated cutter, you can do it. No problem. The cutter is available in two different size blades – a 3/8" or a 1/2". The 3/8" will fit from guide or pilot diameter out to 1-5/8" diameter and the 1/2" will go out all the way to 2". Because the 3-angle system is adjustable, you can make multiple cuts to get exactly the diameter you need. Here's where it gets good though. You can also use the Universal Spring Pad Cutter to modify the OD of your guides to accommodate spring cups. For a better view of this, click on the picture above. You'll note that the guide OD has been reduced and the spring pad size increased. Plus you're not locked into a 5/8" ID. By adjusting the cutter set up you can have a 9/16" ID or whatever size you need. You can't do that with a dedicated cutter; you're locked into a 5/8" ID. But wait, there's more! You can also use the Universal Spring Pad Cutter to shorten the guides to the length you need for your seals. All by adjusting the set-up of the cutter body.
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In this issue Taking the measure of a valve job Level your level before you level your work • • • • • • • • • • • • • • • Resources • • • • • • • • • • • • • • • Featured Product
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Download the AERA Membership Application Flyer and join today! Talkin' Back We get a lot of questions on the basics of engine rebuilding so we're going back to the basics with Talkin' Tech. Tell us what you'd like to have us talk about in future issues of Talkin' Tech. We're working on several ideas, but we're always open to your suggestions. Drop me an email with your ideas or your questions or give me a call at |
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