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It is important to have a proper thermostat - one that has a skirt that descends and blocks the bypass passage when the main passage to the radiator opens. Many aftermarket thermostats do not have the skirt, and hence always leave the radiator bypass open. If you then experience overheating issues when working hard at low speeds (<40km/h or so) then fit a shroud before fitting an electric fan. A large amount of fan efficiency is lost by not having a shroud. That said, while not having a shroud fitted, I have towed a SIIa LWB (with chequer plate ute tray) on a car trailer up a long hill that necessitated 1st gear low range. It got warm, but did not boil. Remember, you have either a 10psi (square tank) or 9psi (round tank) system, so can go a fair bit above 212degF.
Aaron.
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its fine, just make sure the shroud is correctly fitted and its looked after, if you have everything in good order the only time they over heat is in 45 degrees fully loaded pulling 2t of trailer at low speed. and overheating is relative. The 2.25 takes a lot more overheating than any other engine you can think of. With good oil and the 6 pot oil cooler bolted up to them you can run them as aircooled if you need to. (dont ask why I know that)
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G'day Dullbird :)
With my 2a 2.25 Pet I have the square tank 10lb system,with an 8 bladed military fan,I would suggest that a shroud is a nessesity,I have used this vehicle loaded in summer and towed a loaded No 5 trailer without it overheating, but as said the correct type and temp thermostat (82*) and with clean fins there should be no problems providing the timing is set right 6*BTDC on 91 octaine then you are laughing.
cheers
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My 2.25D with a standard radiator hardly ever breaks a sweat. But on stinking hot days (40 degrees plus) it does warm up a bit. Mind you, it's never overheated. It warms to about 78 degrees and stays there on long runs (often never even gets that hot). Up into the nineties on the stinkers. Standard four-blade fan. I have a large electric pusher in front of the radiator if ever I want it at the flick of a switch.
The vehicle's in a million bits at the moment. When she's all back together, I am planning to install a heater fan from a Discovery down near the exhaust manifold to draw hot air out through the left wing. It blows a gale, and may be useful if I ever do cross the Sahara.
Cheers,
John
