It should be remembered that it is not possible to damage the dogs when fully engaged (in gear). (The opposite is true of a synchromesh gearbox as used in passenger cars, where slow movement helps). Successful up-shifting (defined as fast and non dog-damaging) will be achieved by fully moving the dog ring as rapidly as possible from one gear to the next, preferably with the engine's driving load removed until the shift is completed. This includes the gear linkage in the chassis. As a broad guide, the oil quantity and type that runs coolest tends to be the most efficient at lubricating and minimising power loss.įor successful gear shifting, remember that it is critical to ensure that all mechanical elements between the drivers hand and the dog faces are in good order and properly set. When you have established a pattern of gearbox temperature for your vehicle, you can then try different oil quantities and then different oil types. This can detect a big failure before it is catastrophic.Ģ. An above normal temperature indicates a gearbox fault (usually bearing or tooth failure etc.). There are two reasons for logging oil temperature:ġ. a cold wet day will produce cooler gearbox temperatures. The ambient temperature and the loads through the gearbox will affect temperature, i.e. Please note that it usually takes at least 15 minutes of running to reach a level maximum temperature. Monitor the oil temperature and note the pattern of temperature increase and the top temperature achieved. However, we would always offer the following advice to get the most from your transmission:įit a temperature sensor from your data acquisition system into either the gearbox sump area, or into the oil pipeline on a pumped oil system. Hewland do not currently recommend a specific brand of gearbox oil. Images of these components are included in the gallery below.ĭocumentation accompanying the transaxle includes a Hewland maintenance and overhaul manual as well as installation and service diagrams.Hewland Engineering Ltd is frequently asked to recommend oil types or brands for its transmission systems. Spare parts include an assortment of gears, dog rings, shift forks, ring and pinions, bearings, side plates, clutch arms, shims, and a replacement Powerflow differential. The five-speed gearbox is reportedly equipped with a Powerflow adjustable limited-slip differential and the following gear ratios: The unit was reportedly overhauled approximately 10 years ago, and the seller states that it has remained unused since. The transaxle is said to feature 10/31 ring and pinion gears with a final drive ratio of 3.10:1. The FGC utilized a magnesium case and is one of the final developments of the FT200-based transaxles. Hewland was founded in 1957 and became a successful supplier of motorsports transaxles for race car constructors. The transaxle is offered at no reserve in Redondo Beach, California, with an assortment of spare parts, a Hewland maintenance and overhaul manual, and installation and service diagrams. Features include a magnesium case that houses a Powerflow adjustable limited-slip differential and five forward gears. This Hewland FGC transaxle was reportedly acquired by the seller and overhauled approximately 10 years ago, and it is said to have remained unused since.
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