Engine Builder Shop Solutions: February 2010
Shop Solutions published in each issue of Engine Builder Magazine are awarded a $100 Visa Gift Card. Winners will be chosen by the staff of Engine Builder Magazine and the Engine Pro Technical Committee.
Cummins 5.9L, M251 Pump Installation Tip
There is the new instruction sheet for the M251 Cummins pump (Cummins 5.9L 1989-2007), M350 & M351 Cummins pumps (Cummins 5.9L 1986-1998). The pump looks simple enough to install, however, don’t be in a hurry. If the proper procedure is not followed the gears may bind causing engine damage.
After correct procedure is followed rotate the crank, checking the gear backlash in three places.
Technical Services Manager
ASE Master Automotive Technician
Double Shot Peening Performance Valve Springs
A good way to eliminate high rpm valve spring failure is to use a process called “double shot peen.” This is a process used in aircraft and aerospace manufacturing there is a MIL Spec. for this but I’m not sure what it is. I was involved in aircraft blade and vane manufacture in one of my previous jobs where this was used.
Anyway, the procedure is to shot peen the valve spring (or any highly stressed part) until the surface is completely peened (visual) and note the amount of time it took to accomplish this “first visual” step. Then repeat the peening process for the same amount of time you now have a double peened part that will withstand considerably more stress (at least 50 percent). I have used this along with a cryogenic treatment process in all my high performance engines and have never had a valve spring failure.
Kovach & Assoc. Performance Engine Building
Up Front Deposit Formula
Who hasn’t at one time said, “I can’t pay because I’m waiting for people to come pick up their engines?” This is the classic case of not asking for enough money up front. There are many reasons someone might not ask for a big enough deposit. One reason is the fear factor; the fear you will scare the customer away with too large of a deposit.
Don’t be afraid to ask the customer for money up front. The customer is asking you for money by not providing it. There’s also the “good customer” factor; you may treat them with leniency knowing they have paid you in the past, but even good customers can have financial problems. Then there’s the buddy factor; friendship can be your worst financial enemy. If charity is your bag, check out employment options with Salvation Army.
I’m not suggesting you mistreat your customers, or friends, but the money has to come from somewhere, and “somewhere” is usually your pocket.
Here is my deposit formula it’s short and sweet. Get 100 percent deposit on all parts needed for the job (mandatory) and 50 percent deposit for the labor (optional). This will eliminate all of the heartbreak associated with not getting the money up front.
Engine Rebuilders Warehouse
Dania Beach, FL
Sizing Connecting Rods
I have a small shop and don’t have a lot of money for expensive machinery so I do things the old fashioned way. Most of my engines are race or vintage stuff so I encounter bushed rods a lot. Many bushings even after broaching or burnishing require substantial honing to size and as a result may not be parallel when checked after honing.
A simple trick I do is to machine a “tool,” usually from a round aluminum scrap, to the exact size of the big end bore 3˝ long and install 2 rods on it. Snug the bolts gently to allow the rods to align themselves on the hone and hone them as a pair on a well dressed long arbor. When you are within a couple tenths of finish size, separate and finish individually. When checked after finishing this way the rods are usually perfectly square and parallel.
Windup Pickup Enterprises, Inc.
Removing Valve Seat Inserts from Cast Iron Cylinder Heads
If it is necessary to remove an existing valve seat insert in a cast iron cylinder head without damaging the already machined area in the head, use the following procedure.
Using a welding tip from an oxy-acetylene welder, heat the existing seat to a cherry red around its complete diameter. As it cools, it will shrink in diameter and will literally fall out of the head leaving no damage to the cast iron.
Engine Pro Tech. Committee
Correction: Variable Valve Timing Service
Last month’s Shop Solutions bulletin about servicing today’s modern variable valve timing systems (VVT), (Jan. 2010 Engine Builder, page 13) was incorrectly attributed to the wrong contributor. In fact, the contributor who sent this tip to us is Stan Norvile from Rocky Mountain Machine Co., Colo. Springs, CO. We regret the error. Ed.
Engine Builder Shop Solutions is sponsored by Engine Pro,
a consortium of 14 engine parts specialist WDs operating 33 branch
locations serving engine builders/rebuilders across the U.S. Shop
Solutions published in each issue of Engine Builder Magazine are
awarded a $100 Visa Gift Card. Winners will be chosen by
the staff of Engine Builder Magazine and the Engine Pro Technical
To submit a Shop Solution simply mail your entry
to Engine Builder Magazine, Shop Solutions, 3550 Embassy Parkway,
Akron, OH 44333; or email to Shop Solutions@enginebuildermag.com. Shop
Solutions may also be emailed to firstname.lastname@example.org.You must include
your name, shop name, shop address and shop telephone number. Submitted
Shop Solutions not published will be kept on file and reevaluated for
publication with each month’s new entries. If you include your email
address you will be emailed notification of publication if your Shop
Solution is chosen.