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Gear Covers

Gear Covers

Cannonball Big Twin Flathead Crankcases Kits with Cams and Gear Cover
Cannonball Big Twin Flathead Crankcases Kits with Cams and Gear Cover
The main challenge during restoration and assembly of Flathead engines is the exchange and alignment of the bushings in the right crankcase and the gear cover. Nine bronze bushings need to be installed and line reamed to ensure that four cams and the pinion shaft with its gears turn smoothly. This is a major task and requires several special reamers, which your average workshop does not have. The problem increases when case and cover were not factory matched.
These Cannonball cases for 1937-1948 Big Twin Flatheads feature a pre-fitted gear cover with all bushings and pins installed and are line bored for a set of Andrews cam gears, which are also included. This work is performed in Germany on a coordinate line boring machine, which is superior to reaming. The cover also has its flutter valve and spring-loaded oil separator seal ring installed. All this will cut the working time for the complete engine assembly at least in half and guarantees a quietly running motor, just as if assembled in Milwaukee, provided that the remaining valve train is in good order, too.
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Generator Style Gear Covers 8 Rib 1936-1953
Generator Style Gear Covers 8 Rib 1936-1953
Stock replacement gear covers for generator style OHV engines. They are machined to accept the stock ¼”-24 mounting screws with countersunk heads. The bushings for camshaft and pinion shaft are pre-installed and meet stock oiling system requirements. Every effort is made to ensure that these covers look as much like stock as possible which is so important in restoration applications.
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Generator Style Gear Covers 4 Rib 1954-1962
Generator Style Gear Covers 4 Rib 1954-1962
Stock replacement gear covers for generator style OHV engines. They are machined to accept the stock ¼”-24 mounting screws with countersunk heads. The bushings for camshaft and pinion shaft are pre-installed and meet stock oiling system requirements. Every effort is made to ensure that these covers look as much like stock as possible which is so important in restoration applications.
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Generator Style Gear Covers Smooth 1966-1969
Generator Style Gear Covers Smooth 1966-1969
Stock replacement gear covers for generator style OHV engines. They are machined to accept the stock ¼”-24 mounting screws with countersunk heads. The bushings for camshaft and pinion shaft are pre-installed and meet stock oiling system requirements. Every effort is made to ensure that these covers look as much like stock as possible which is so important in restoration applications.
The provided additional brass bushing for 11/16" Ø pinion shafts allows the installation on Big Twin engines 1936-1953.
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Gear Covers 1970-1999
Gear Covers 1970-1999
Reproduction of the stock late style Big Twin gear cover for 1970–early 73 and late 1973-99 models. The 1970–early 73 versions fit models with side oiling pinion shaft, the late 1973-99 versions fit models with end oiling pinion shaft.
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S&S Gear Covers
S&S Gear Covers
Gearcovers for alternator style Big Twins. In spite of the simple, elegant design, these gearcovers are tough as nails. Machined from a solid aluminum billet, they are extremely strong and are dimensionally more precise than is possible with a cast part. The finish is flawless, show quality polished aluminum. Available For 1973-1992 and 1993-1999 Style Engines. The latter should only be used with engines that have the crankcase breather routed through the cylinder heads.
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Oil Passage Screw Panhead 1963-1965
Oil Passage Screw Panhead 1963-1965
Oil passage screw for 1963-1965 Panhead.
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Gear Cover Bushings Flathead 45” and Model K
Gear Cover Bushings Flathead 45” and Model K
Gear Cover Bushings Flathead 74” and 80”
Gear Cover Bushings Flathead 74” and 80”
Gear Cover Bushings Sportsters
Gear Cover Bushings Sportsters
Gear Cover Bushings Big Twin 1936-1953
Gear Cover Bushings Big Twin 1936-1953
Gear Cover Bushings Big Twin 1954-1969
Gear Cover Bushings Big Twin 1954-1969
Gear Cover Bushings Big Twin 1970-1999
Gear Cover Bushings Big Twin 1970-1999

Timing cover or Gear cover

Made of cast aluminum. The choice of good covers for the timing case of Harley-Davidson V-Twin engines is limited, especially for the sidevalve or early Sportster models. We can only assume it is due to the five bushings for the crankshaft and camshafts, all of which must be properly aligned, pinned and reamed to size. This makes the rebuilding process complicated, as the guys at Cannonball found out when they reissued the timing covers for 1937-1948 U-models.

Just a cover?

No. Even on the ioe models from 1915 onwards, the timing cover was the carrier for the automatic oil pump. In the later models, the timing case cover contains the counter-bearing bushes for the right-hand crankshaft and the camshafts. These bushes are available separately and can be replaced. After replacement, they must be reamed to size as mentioned, preferably and most carefully after removing the crankshaft from the inside of the right-hand half of the engine housing, using specially guided reamers to ensure that the bearings in the engine housing and the bushes in the timing case cover are aligned.

Have any questions?

Our service team will be glad to help out: Mondays - Thursdays 08:00-17:00 CET, Fridays 08:00-16:00 CET, Phone: +49 / 931 250 61 16, eMail: service@wwag.com