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AERATION AERATORS
Full range of Groundsman pedestrian and tractor mounted models with all accessories
SALES AND HIRE
Contact Synergy Products on 01380 828337
Dave on mobile: 07971 843802 Email:
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Use Airforce Advanced Terralift technology
compaction and waterlogging
Relief of metre depth TERRAIN AERATION
T: 01449 673783 F: 01449 614564 email:
terrainaeration@aol.com www.terrainaeration.com
www.pitchcare.com ARTIFICIAL
Aeration to one
Pat ‘Cal’ Callaby, Workshop Manager at the Celtic Manor Resort, explains the workings of the humble radiator cap and why it is so important in modern day machinery
Artificial turf and synthetic grass supply & installation
We offer a full range products and services including: Synthetic Grass Pitches • Multi Use Games Areas Tennis court resurfacing and remarking Synthetic Cricket Wickets • Sports fencing
Sports pitch maintenance services • Ancillary Services Fencing • Sport Equipment and Supply Line marking • Maintenance and Repairs
Tel: 0871 288 3425 Email:
info@astrosport.co.uk www.astrosport.co.uk
maintenance I noticed that, although the important points were explained fully when it came to the cooling system, from a maintenance point of view, the radiator cap and water pump received little mention. This is understandable because these are not “maintained” components as such, but may need to be replaced at some point because of a failure. When carrying out job
H PITCH CLEAN SYNTHETIC PITCH CLEANING SERVICES
Experience enhanced playing characteristics and improved drainage and aesthetics
• Synthetic Turf Cleaning • Infill Decompaction • Infill Leveling • Surface Cleaning • Infill Clean and Recycle • Algae Treatment • Hard Sports Courts Cleaning
Email:
info@pitchclean.co.uk www.pitchclean.co.uk
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116 Tel: 01362 851930 Mobile: 07879 495445
interviews for technicians I always slip a radiator cap in my pocket and, at some point, place it on the table and say, “tell me all you know about this cap”. Over the years I have had some surprising (and disappointing) answers but never a full and precise one. One young man gave me a full and accurate description of a thermostat and another told me it was a petrol cap. Job interviews seem to put people on edge and under pressure and silly things are blurted out, so these answers are not taken seriously. A little coaxing generally gets a better answer, never a full one, but a better one. Why the radiator cap should be largely ignored by technical instructors in colleges is a mystery to me. It is a simple but very important part of the cooling system and has had a huge impact on body styling in the post second world war years, with the introduction of the pressurised cooling system together with the water pump.
So, on with the radiator cap
You may have noticed, at some time in the past while idly turning over a radiator cap in your hands, that a number is stamped in the
aving read Adrian Langmead’s excellent article on diesel engine
top, anything from 3 to 15 but nowadays more commonly 10 to 15. This is the pressure in pounds at which the valve in the neck of the radiator, attached to the spring, will become unseated and compress the spring in the cap. It is, in essence, a pressure release valve, but there is more to it than that, so please read on. When the cooling system gets
Mechanics
THE CAP THAT KEEPS IT’S COOL!
hotter the coolant expands causing pressure within the engine, radiator and hoses. If this pressure is not released then damage may occur, such as cracking the radiator, heater matrix or splitting a hose. This damage will happen at the weakest point, so if you have ‘dodgy’ hoses through chafing or oil contamination, beware because you may have a failure long before the engine reaches its intended operating pressure/temperature.
Why do we have pressurised cooling systems?
Water has a higher boiling point when under pressure and we all know that water turns to steam when it boils. Escapes from a cooling system mean overheating due to lack of water, or constantly checking the water and “topping up” the level to keep the system operating efficiently. This means carrying water, stopping, waiting for the engine to cool sufficiently to be able to check and possibly adding water; hugely inconvenient I think you’ll agree. It is so much simpler to raise the boiling point by raising the pressure in the cooling system in a controlled way. Water will boil at a higher temperature under pressure by 2.5 degrees Fahrenheit per 1 pound of pressure, so a spring that is unseated at 15 pounds pressure
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