1996
General Discussion Area / Project TB2 - Update 4
« on: 07 April 2007, 21:08:30 »
Those that have followed the saga know that we found the intercooler fan was seized. Today, I have managed to free it off by initially turning by hand, and then by connecting up one of those 12v jump starters for 30mins. Jobs a good 'un
Also, checked the tensioner, as suggested by Omegatoy - apparently its common for them to seize. Mine was free-ish, but I greased it up anyway. Had to go out to buy the tool required though.
I think the viscous fan is knackered - I noticed it becomes easier to turn by hand when it gets hot, and when turning off the engine when hot, the fan spins itself for about 30s. This is not my (limited) understanding of viscous fans.
So I took it for a spin with the electric fans wired up permently (on low setting). Better, but stilling getting too hot, so I think something else is still causing a problem.
I've also tried a petrol expansion tank, but can't seem to get a good enough seal on the 'extra' pipe, so can't test further until I get a bigger bolt and some better jubilee clip.
When it gets hot, I get lots of tiny bubbles in coolant, so I think it is boiling in places when under load. Therefore I think the coolant isn't flowing fast enough, so back to radiator theory.
So, next things to try is a different viscous fan, and a different (hopefully better) radiator.
Any further ideas?
Also, checked the tensioner, as suggested by Omegatoy - apparently its common for them to seize. Mine was free-ish, but I greased it up anyway. Had to go out to buy the tool required though.
I think the viscous fan is knackered - I noticed it becomes easier to turn by hand when it gets hot, and when turning off the engine when hot, the fan spins itself for about 30s. This is not my (limited) understanding of viscous fans.
So I took it for a spin with the electric fans wired up permently (on low setting). Better, but stilling getting too hot, so I think something else is still causing a problem.
I've also tried a petrol expansion tank, but can't seem to get a good enough seal on the 'extra' pipe, so can't test further until I get a bigger bolt and some better jubilee clip.
When it gets hot, I get lots of tiny bubbles in coolant, so I think it is boiling in places when under load. Therefore I think the coolant isn't flowing fast enough, so back to radiator theory.
So, next things to try is a different viscous fan, and a different (hopefully better) radiator.
Any further ideas?