To advertise in this section contact Classifieds
Peter Britton on 01747 855335 email:
peter@pitchcare.com
ARTIFICIAL Radiator cap showing pressure relief valve
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”
will allow water to reach 249.5 degrees before boiling and then turning to steam. Any escape of coolant is past the cap and down an overflow tube to the expansion tank. You will see, if you examine a modern cooling system, that the tube goes through the cap or a port in the tank and reaches almost to the bottom. The tank is marked (usually) with a line towards the bottom and another towards the top; the end of the tube should be immersed in the coolant in the bottom of the tank to prevent air being sucked into the cooling system when the engine cools after switching off. I’m sure many of you have gingerly tried to remove a radiator cap when experiencing overheating problems only to find that very hot water keeps escaping. Using towels, rags etc. you persevere, but it goes straight through the cloth and you still have to wait for the water to cool down sufficiently. This is because you have lowered the pressure inside the cooling system and the water boils immediately, expands and escapes past the partly undone radiator cap. Attempting to remove the cap before cooling is complete, and by that I mean that pressure has been released and the temperature has dropped below boiling point, scalds many people. So, you have completed your
Where are we with the cooling system now? The water level has dropped with this contraction, but what replaces it? There is a partial vacuum in the cooling system, and now outside air pressure could damage the radiator; look again at your radiator cap and you will see on the end of the spring a small flat valve that opens against the spring. When the coolant cools sufficiently to form a vacuum, this valve is forced open by the outside air pressure and coolant from the expansion tank is sucked back into the radiator. Before the introduction of the
DRAINAGE
DRAINAGE SPECIALISTS
DESIGN & INSTALLATION PRIMARY SYSTEMS SAND SLITTING & GRAVEL BANDING
CYLINDER GRINDERS
Tel. 01722 716361
www.mjabbott.co.uk
F.T. MACHINES
NEW - USED - RECONDITIONED MOWER SHARPENING MACHINES SPARES - GRINDING WHEELS
ianfearftm@aol.com 07774 258052
journey (or your work period) and have had no overheating problems and all is well with your cooling system. You park your car (or machine) for, let’s say, three hours, the engine cools and all that has expanded now contracts.
water pump, engines relied on Thermo-Siphon (the less dense hot water rising above denser cold water) to circulate water around the cooling system. This was used for many years but meant very large engine water jackets and huge radiators. Just look at pictures of early cars with their large brass radiators and compare them with today’s models. The early cars always had a radiator at the front of the car to get maximum airflow through. Today’s car often has the engine in the rear and the radiator, quite often, is remote from the engine altogether. So, the water pump, together with the pressurised cooling system, has had an enormous impact on body styling. No longer those huge radiators stuck out in front, instead the lower bodylines, shorter engine bays, less weight and better forward vision, allowing lower seating positions and consequent lower centre of gravity, resulting in improved stability when cornering and on uneven ground.
www.foleyunited.com www.nearytec.com
Tel: 01462 683031 email:
admin@huntergrinders.com
www.huntergrinders.com DRAINAGE 45
Cost effective drainage quick and neat trenching work with minimal disruption to play.
PHILIP DIXON Contractors Ltd Est. 1978 Sportsturf Drainage Specialists
Golf Course • Sportsfield Drainage • Construction • Renovation Slitting/Banding • Vertidraining Groundbreaker • Sand Master Topdressing • Overseeding Spraying • Cultivation
Tel: 01772 877289
Fax: 01772 877479 (Preston, Lancs)
www.dixondrainage.co.uk
AFT Trenchers
Tel: 01787 311811
info@trenchers.co.uk www.trenchers.co.uk
Draining and Gravel Banding
also Vertidraining, Hollow Coring, Overseeding, Field Top Maker, Deep Scarifying
Mobile: 07860 259692 Radiator cap showing vacuum relief valve
Tel: 01284 735105 Email:
peter@buryturfcare.com www.buryturfcare.com
Blec Vibro Sand Banding : Koro Surfacing : Vertidraining : Topdressing : Overseeding
Koro Surfacing : Vertidraining : Topdressing : Overseeding If it’s drainage, it has to be Duncan Ross!
Koro Surfacing : Vertidraining : Topdressing : Overseeding If it’s drainage, it has to be Duncan Ross!
If it’s drainage, it has to be Duncan Ross! DESIGN : INSTALLATION : MAINTENANCE
Pitch Construction : Piped Drainage Systems Sand Slitting : Blec Vibro Sand Banding
Pitch Construction : Piped Drainage Systems Sand Slitting : Blec Vibro Sand Banding
Pitch Construction : Piped Drainage Systems : Sand Slitting Appley Bridge, Wigan, Lancashire WN6 9DT
t 01257 255321 f 01257 255327 e
office@duncanrosslanddrainage.co.uk www.duncanrosslanddrainage.co.uk
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