Oil Pan, Engine Heads, Intake Since the engine selected for CobraB. replica is a high-performance 427 racing engine, we opted to install a large-capacity oil-pan. In addition to a higher capacity, the road-racing design offers low-profile construction to help ensure that the casing won't scrape the pavement on bumpy roads, and it incorporates a built-in provision for the oil-temperature send-unit that will be installed. The interior of the pan utilizes a windage-tray that keeps the oil off of the crank while it's spinning, and a baffle design that helps ensure that oil is always being supplied to the oil pickup-tube. Even in track situations of rapid acceleration, hard braking or severe turning or banking -- when oil might slosh to the front, back or sides of the pan -- the baffles ensure that the engine won't be starved for oil. Even in ordinary driving situations, the high-performance oil pan will help the engine to perform at its best. On the 427 engine, the front engine-cover also serves as an integral part of the pan mating-surface. The front-seal, gasket and cover are installed onto the engine-block, followed by the crank-sleeve (figure A). The oil-seal rests on the crank-sleeve to keep the oil inside the crank case. Because of the sophisticated design of the pan and windage-screen, studs are used to install the pan onto the engine block. Installation with studs makes for a neater assembly. Once the studs have been threaded into place in the block, the windage-tray gasket is installed, followed by the windage tray itself (figure B) and the oil-pump driveshaft. Next, the oil-pump is installed by bolting it into place (figure C), then the pick-up screen and gasket assembly are installed. Once the oil-pump and pick-up assembly have been installed, the pan may be carefully lowered into position (figure D) and tightened down with a series of nuts. A "key" fastener is then inserted into a slot on the crank sleeve. This will form the attachment point for the harmonic dampener that attaches to the crank. The harmonic dampener, which serves to keep the timing marks adjusted properly, is installed onto the crank (figure E). The dampener is held in place with a washer and bolt. The bolt is installed finger-tight, then torque-tightened to around 90 pounds using a torque wrench. Following the installation of the pan and dampener, a dial indicator is used to calibrate positioning of piston #1 at top-dead-center while the alignment of the timing marks on the dampener is checked (figure F). After the dampener has been installed and calibrated, the engine heads are given a quick cleaning and checked for any metal burrs, shavings or contaminants (figure G). Alignment dowels (for mounting the engine head) are installed into premachined holes in the engine block (figure H). With the dowels installed, the head gaskets are put in place on the block (figure I), making certain that they are oriented properly. (There is a designated right and left side built into the gasket design.) Once the gasket is in place, the head is carefully set in place on the block (figure J). The bolts that secure the head to the block are lubricated and then installed finger-tight. Once all of the bolts are in place, each one is torque-tightened to spec using the step-torque technique. Each is tightened first to 50, then to 75, then to 100-foot-pounds (figure K). The process is repeated for both heads. After the heads are installed, the engine is allowed to sit for a few hours, then the heads are removed, and the installation steps are repeated. This assembly, disassembly and reassembly will help stretch the bolts properly and compress the gasket for added stability later on. The 427 or Ford FE engine-series uses a heat shield between the intake and the lifter valley to prevent hot oil from splashing onto the bottom of the intakes. After the heads are installed, the heat shield is snapped into place (figure L). With the heat shield installed, the intake gaskets may be put into place (figure M). Sealant is then applied to each end of the block to prepare it to receive the aluminum high-rise intake assembly. The intake is then carefully set into place (figure N). The intake bolts are installed and torque-tightened to spec according to the manufacturer's recommendations.
RESOURCES :
cobracountry.com
Premiere online resource for all things related to CobraB. reproductions. Established by enthusiast Curt Scott, and maintained by Crown Communications of Santa Clarita, CA, the site contains news, articles archives, a directory of Cobra-replica specialists and manufacturers, aftermarket sources, announcements of upcoming shows and rallies, listings of Cobra clubs, links to other Cobra sites, and more.
Cobra Country
Website: www.cobracountry.com
Unique Motorcars
Unique Motorcars
(Unique Cobra Specialists)
Manufacturers of high-quality Cobra® replicas since 1977, Unique Motorcars also maintains an informational and well-illustrated web site providing information about their Cobra reproductions and related products. Assembly manuals for their kits (including the one used in DIY's Build A Kit Car workshop) are available on their site.
230 E. Broad Street
Gadsden, AL 35903
Phone: 256-546-3708
Web site: www.uniquecobrareplicas.com
Information also available at:
www.cobracountry.com/unique
The Cobra Story: A Man, His Dream and His Automobile
Author: Carroll Shelby and John Bentley
1965, Trident Press
Carroll Shelby website
Shelby Cobra: The Shelby American Original Color Archives 1962-1965
Model: 0879387572
Author: Dave Friedman
(1994)
To order this title from Amazon.com, click here.
Motorbooks International (MBI Publishing)
Essential AC Cobra : The Cars and Their Story 1962-67
Model: 1870979850
Author: Rinsley Mills
(1997)
To order this title from Amazon.com, click here.
Motorbooks International (MBI Publishing)
Shelby Cobra Gold Portfolio, 1962-69
Model: 1855200236
Author: R.M. Clarke
(1990)
To order this title from Amazon.com, click here.
Motorbooks International (MBI Publishing)
Carroll Shelby's Racing Cobra
Model: 0850454573
Author: Dave Friedman and John Christy
To order this title from Amazon.com, click here.
Motorbooks International (MBI Publishing)
Shelby's Wildlife: The Cobras and Mustangs
Model: 0879380454
Author: Wallace A. Wyss
To order this title from Amazon.com, click here.
Motorbooks International (MBI Publishing)
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