GARNER CHASSIS MODIFICATIONS,
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y N the issue of The Commeriai _LMotor dated November 15th, 1927, we gave details of the Garner chassis designed to carry 20-seater bus and coach bodies. Since that date certain details have been amended and we therefore outline the design of the latest type, which is known as the PA or the PAZ according to the engine capacity.
TypoPA has an engine of SO mini. bore and 130 rem. stroke, equalling 2,613 c.c. The power unit of type PAJ has a bore of 95 mm. and a stroke of 140 rem., or 3,969 CR. Except in respect of minor details the chassis resemble each other and the available body space is identical, namely, 15 ft. 4-i ins. The wheelbase is 12 ft. and the frame height, when laden, 2 ft. 3 ins. The frame line is straight throughout, and provided that the undersides of the floorboards over the rearmost universal joint are 24 ins, above the frame, there will be no need for any variation in floor level to clear the worm housing and disc joint
The chassis side members are 5i• ins. deep with 2-in, flanges, which are not drilled except at the extreme front end. All brackets and tubular crossmembers are secured by bolts. The dashboard is fixed by bolts passing through the vertical sides of the frame, not through the flanges, whilst there is clearance between the dash panel and the frame to prevent noise and to avoid distortion of the dash. A water channel around the dash allows the coachbuilder to fit a floating scuttle.
Semi-elliptic springs are used all around, those at the rear being underslung ; the front springs are 3 ft. 2i ins. long and the rear ones 4 ft. 31ins. The front axle is of fl-section with inclined steering pivots ; earn and roller steering is employed in conjunction with an 18-in. wheel. The rear axle is of the overhead-worm type and is fully floating. Taper-roller wheel bearings are employed, as in the ease of the front axle. • Both sets of internal-expanding brake shoes operate in the rear-wheel drums, those controlled by the hand lever being 15 ins, in diameter, whilst the pedal operated set measures 141• ins. For £35 extra, front-wheel brakes can be fitted to either chassis.
Both .engines are of the side-valve pattern, but they differ somewhat in construction. The . smaller unit has thermo-siphon cooling and tandem mounting for the dynamo and magneto, whilst the cylinder head is detachable. The larger engine is of tbe.monobloc type, has pump circulation, a chaindriven dynamo mounted above the magneto, inspection doors on 'the near side of the crankcase; force-feed -lubrication to the three-bearing crankshaft, eccentric fan-beltadjustment and an' expanding pulley ler tensioning the pump drive. The engine is carried in the patented Garner manner, that is, one of the rear points is spherically mounted only, whilst the other two are also permitted a sliding motion. A saddle is provided for carrying an engine starter if this be specified by the purchaser.
md Ci;ntials for the Boieh triakffetd and the Zenith carburetter are provided an the dash; the hand throttle works only the first quanter of the full travel of the pedal. The clutch is of the cone type with a stop built in and the friction material is Fero-do.
An important feature of the gearbox can be seen when the cover plate is removed: the selector gear will be found on the right, the mainshaft central, and the layshaft to the left of and below the mainshaft. In this way there is absolute accessibility, no one cora
Doiieiit mashing another. The gate is mounted on the top of the box. There are four forward ratios of 1, 1.583, 2.617 and 5.277 to 1, whilst the reverse Is 8.246 to 1.The final-drive ratio is 6.5 to 1, or 7 to I. if desired.
The engine, clutch and gearbox are bolted together to form a unit. From the gearbox the power passes through a flexible-disc joint to a transmission centre bearing of patent design; this incorporates a self-aligning bearing automatically lubricated and protected by dust washers. The aft portion of
the shaft has a flexible-disc joint at each end.
The detachable disc wheels carry 33-in, by 5-in. pneumatics and the spare wheel is accommodated below the chassis at the back. A set of ten frame outriggers is supplied for body widths up to 7 ft. 2 ins. A Boyce Motometer is fitted in the radiator cap and the speedometer is a Smith. Lucas lighting is installed. The vehicle with the larger engine costs £475; with the smaller unit 1423. The makers are Garner Motors, Ltd.