Valve Guide Reconditioning
A valve loses about 15 to 30 percent of its heat through the stem. On the exhaust side where there is no cooling effect from the incoming air/fuel mixture, the guides are critical, because cooling through the stem is especially important for valve longevity. Worn intake guides or ones with too much clearance can also
The Future Of Boring Is Exciting
Boring out cylinders to accept oversized pistons or sleeves has long been a common practice in the engine rebuilding business. Boring allows worn blocks to be salvaged, and stock cylinder bores to be enlarged for more displacement. More recently, boring is also being used to install special cylinder liners with hard surface treatments in high
Coretalk: September 2001
Ford Plans to Revamp Parts Distribution Network Ford Motor Co. is working to restructure and expand its United States parts distribution network to deliver service and repair parts to its dealers faster and more efficiently. Over the next three years, Ford plans to increase the number of parts distribution centers from 10 to 21, creating
Engine Cylinder Bore Surface Finishes
What’s the best type of cylinder bore finish for today’s engines? Most would say it’s a finish that allows the rings to seat quickly and completely so the engine doesn’t use oil. For many applications, that may mean a plateau finish. The surface finish must also meet the piston ring manufacturer’s specifications and have the
Cleaning Equipment Maintenance
The saying, "An ounce of preventionis worth a pound of cure," definitely holds true when itcomes to the operation of cleaning equipment in rebuilding shops. According to David Zehren, product manager,stationary equipment for Georg Fischer Disa Goff, Inc., Seminole,OK, routine maintenance of cleaning equipment impacts all rebuilders,no matter how large or small. "The issue of
“Heading” In The Right Direction: Heads Are A Hot Commodity These Days
Heads are a hot commodity these days, but itdepends on the application. Some heads like those for Chevy 350and Chrysler 2.2L/2.5L engines are always in demand, but pricesare low because of the glut of cores that are available for theseengines. Even so, anybody who’s selling heads these days has tohave them. The hot heads are
Cleaning With Jet Spray Washers: Replacing Solvent Cleaning Processes With Aqueous Cleaning.
As more environmental regulations phase outmany chlorinated solvents and ozone depleting chemicals, manyautomotive machine shops and engine rebuilding operations arereplacing their solvent cleaning processes with aqueous cleaning.Some argue that while replacement chemicals have been found, theirtotal safety and part cleaning applicability has not been researchedenough. According to many rebuilders and equipment makers, developmentsin aqueous cleaning
Shot Blasting Equipment Maintenance: Simple Does Not Mean Maintenance-Free
The technology of hurling steel or glass shot at more than 100 mph is pretty simple. But in the world of shot blasting machines, simple does not mean maintenance-free. The essence of these machines, no matter what their design, is that clean core parts come at the price of dramatic wear-down of media, as well
Valve Guide Repair Options
One thing you can almost always count on when rebuilding a cylinder head is worn valve guides. The guides experience a lot of wear because of the constant friction between the guide and stem. To make matters worse, positive valve seals on late model engines prevent the guides from receiving much lubrication. Side forces on