How to rebuild an engine
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http://www.moroso.com/catalog/categorydisplay.asp?catcode=27006 | http://www.moroso.com/catalog/categorydisplay.asp?catcode=27006 | ||
| − | 3. Oil.... From what I've read, there are only a couple of oils left that will give protection to your new cam and lifters and even they are changing formulations as we speak. Crane Cams recommends Shell Rotella and an engine oil supplement containing extreme pressure lubricants | + | 3. Oil.... From what I've read, there are only a couple of oils left that will give protection to your new cam and lifters and even they are changing formulations as we speak. Crane Cams recommends Shell Rotella and an engine oil supplement containing extreme pressure lubricants. The other oil that is touted by engine builders is 15-40 RPM Delo. |
http://www.shell.com/home/Framework?siteId=rotella-en&FC2=/rotella-en/html/iwgen/products/zzz_lhn.html&FC3=/rotella-en/html/iwgen/products/product_rotellamulti.html | http://www.shell.com/home/Framework?siteId=rotella-en&FC2=/rotella-en/html/iwgen/products/zzz_lhn.html&FC3=/rotella-en/html/iwgen/products/product_rotellamulti.html | ||
| − | + | GM has discontinued the EOS they used to offer. I used it for years to break in new motors, so had to search out an alternative. A friend of mine who holds a PhD in chemistry found a company that produces an engine oil additive that contains a good dose of ZDDP, the extreme pressure lubricant that is being phased out of conventional motor oils because it poisons catalytic converters and leads to increased warranty claims at the new car dealership service departments. In my opinion, if you use a good quality oil and add 1 1/2 ounces of this additive per quart of oil for initial startup, you've done as well as you can to prevent lifter/lobe scuff. With subsequent oil changes, one ounce per quart of oil should help to contribute to long engine life. | |
| − | I | + | http://www.sfrcorp.com/product/9 |
| − | http://www. | + | |
4. Assemble your heads with old, used --STOCK-- springs. DO NOT ASSEMBLE WITH THE SPRINGS YOU WILL EVENTUALLY RUN. I keep an old set on the shelf just for running in a new motor, then change them out at the 30 mile mark. Manley makes a lever-type tool for this procedure, to be used with shop air to keep the valve seated. Don't have shop air?? Change them out at a buddies house or have the machine shop do it. What's that you say, you don't want the hassle of changing out the springs?? O.K., suffer the alternative then. | 4. Assemble your heads with old, used --STOCK-- springs. DO NOT ASSEMBLE WITH THE SPRINGS YOU WILL EVENTUALLY RUN. I keep an old set on the shelf just for running in a new motor, then change them out at the 30 mile mark. Manley makes a lever-type tool for this procedure, to be used with shop air to keep the valve seated. Don't have shop air?? Change them out at a buddies house or have the machine shop do it. What's that you say, you don't want the hassle of changing out the springs?? O.K., suffer the alternative then. | ||
http://www.jegs.com/webapp/wcs/stores/servlet/product_10001_10002_748285_-1_10797 | http://www.jegs.com/webapp/wcs/stores/servlet/product_10001_10002_748285_-1_10797 | ||
| − | The other way is a set of reduced-ratio rocker arms for break-in. I've heard that Crower Cams makes some 1.2:1 for SBC and 1.5:1 for BBC, but am unable to find them in Crower's catalog. I suspect they would be high-buck roller units though, something that might be out of the reach of the home builder who only does one or two builds a year. Somebody | + | The other way is a set of reduced-ratio rocker arms for break-in. I've heard that Crower Cams makes some 1.2:1 for SBC and 1.5:1 for BBC, but am unable to find them in Crower's catalog. I suspect they would be high-buck roller units though, something that might be out of the reach of the home builder who only does one or two builds a year. Somebody needs to step up and make some stamped steel rockers in a reduced ratio that would be affordable for everyone. |
5. Checking for interference. Nothing will wipe a cam and lifters quicker than mechanical interference in the valvetrain. Check for piston to valve clearance, rocker arm to stud clearance at full lift, spring coil bind (stacking solid) and retainer to valve guide boss clearance at full lift. Also check for pushrod to guide clearance to insure the pushrods are not rubbing or binding. You might have one culprit that you didn't catch, such as a bent pushrod. Roll all pushrods on a piece of plate glass before assembly to insure straightness. | 5. Checking for interference. Nothing will wipe a cam and lifters quicker than mechanical interference in the valvetrain. Check for piston to valve clearance, rocker arm to stud clearance at full lift, spring coil bind (stacking solid) and retainer to valve guide boss clearance at full lift. Also check for pushrod to guide clearance to insure the pushrods are not rubbing or binding. You might have one culprit that you didn't catch, such as a bent pushrod. Roll all pushrods on a piece of plate glass before assembly to insure straightness. | ||
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Put a socket on the harmonic damper retaining bolt and rotate the motor through at least 2 full revolutions while priming. | Put a socket on the harmonic damper retaining bolt and rotate the motor through at least 2 full revolutions while priming. | ||
| − | 10. At the end of your 20 minute break-in period, drop the oil and filter and change them out | + | 10. At the end of your 20 minute break-in period, drop the oil and filter and change them out. Drive the vehicle for 30 miles, altering the speed and letting the motor rev down from 60 mph to 20 mph with your foot off the gas pedal. Drop the oil and filter and repeat the EOS again. CHANGE THE VALVE SPRINGS TO THE ONES THAT CAME WITH THE CAM KIT. Drive for 500 miles and drop the oil and filter again. |
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