Tech Notes Archives - Page 12 of 35 - Engine Builder Magazine
Installing Exhaust Guides in GM Big Block Engines

The only practical method to determine if this is a problemis to install new a new guide, grind the valve seat, and pressure testthe cylinder head. If both a uniform seat width and leak-free sealaround the guide can be obtained, then the original concentricity wasnot a problem. Also note that the exhaust valve guides are

Tips For Measuring Ring End Gaps

Usually when looking for ring specs, the manuals explain which direction to install the rings first and then somewhere towards the bottom of the page reference a bore (gauge) size for the liner. While the manuals may change in their wording the method to measure the end gap does not. Using a common 5.40? bore

Modification of Timing Belt Tensioner Bracket on 2004-2005 Subaru Engines

Affected applications: 2004MY Forester; 2005MY Legacy and Impreza On SOHC engines, the shape of the bracket and the size of the 2 (upper side) installation bolts were changed. On DOHC engines, the shape of the bracket was changed and ribs added to increase rigidity. PRODUCTION LINE CHANGE The new style tensioner brackets were used in

Good Carbs And Bad Carbs

If you still have any small thought that slapping a quick kit into anold carb will be the end of it, you are deep in denial. For thatmatter, if you think that you can grab a new carb off the shelf andmake it work right, you are equally uninformed. This is important in that when

Diesel Connecting Rod Reconditioning

As a result, connecting rodreconditioning is a critical part of all diesel overhauls. Uponteardown, the old connecting rods are inspected, magnafluxed, checkedfor alignment, parting surfaces re-machined, and new rod bushingsinstalled and pin-fit. At the same time, the rod bolts are measured forstretch. This is all normal, day in, day out activity at any heavy duty

Cylinder Heads and Air Velocity

An engine only produces power in a narrow rpm band, so [your customer] needs to decide what kind of driving or racing they’re going to do, and build the engine in a way that moves that power band to the portion of the rpm range you want. Street cruising needs high air velocity below 4,000

Oil Leak By Crankshaft Seal on Porsche Boxter Engines

Models Affected: 97-’04 Boxter/Boxter S M96.23, M96.24 Engines Examination of engines that were the subject of complaints revealed other oil leaks in addition to those found in the crankshaft sealing ring on the flywheel side. These engine oil leak areas included: • Crankcase bolt threads • Intermediateshaft flange area. Since March 10, 2004, bolts with

Revised Timing Belt Tensioner for Acura 3.2L Engine

A revised timing belt auto-tensioner for 2002-2003 Acura 3.2L engines is now available (P/N 14520-P8E-A01). This tensioner is part of a product improvement by Acura. The original design timing belt tensioner is filled with oil to dampen oscillation. Due to a manufacturing situation, the tensioner oil can leak. If enough oil is lost, the timing

Why Must I Install New Lifters With My New Flat Tappet Camshaft?

The following illustration demonstrateswhy you must install new lifters: • A new lifter has a slight "crown." A new cam has a slightly tapered face that causes the lifter to rotate. Note the smooth, wide contact patern in Figure 1.  • Installing a new cam with used lifters creates a concentrated contact pattern on the

GM 8.1L Ring References

Type the word "ring" in the Google search engine and get beyond all thestuff that is being sold and you will be amazed at how many occurrencesthere are. It is mind boggling. There is even a site that monitors andarchives data relevant to planetary rings. You can’t talk about rings and not mention the Olympic

New Aftermarket Automotive Belts and Hoses Last Longer

There was a time when rubber belts and hoses were maintenance itemsthat had to be replaced every five or six years, depending on theircondition. The original equipment belts and hoses on today’s late-model vehiclesare mostly made of EPDM (ethylene propylene diene monomer), a syntheticrubber that is far more durable, heat-resistant and wear-resistant thanNeoprene. This means

Cylinder Honing Recommendations

For use with CPN and CPN2 piston rings, it is recommended that you plateau hone with a cylinder bore cross hatch angle of 35-40 degrees.   To reach this roughness, the manufacturers of honing machines and accessories recommend using the following stones for a gray cast iron engine block and Nikasil cylinders. • Conventional stones: