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Car Forum / Australian Car Forums / General Car Topics (Australian group) / April 2006What's wrong with it?
Apart from the badge on the grill! 96 3.5L DOHC Pajero on gas. Broke down this morning. Pulled over. Engine stalled. Converter had iced up. Thought either too much gas or not enough water. More likely not enough water, as gas system was serviced a month ago. Lots of bubbling and gurgling in the overflow bottle. Got the cap off, took hardly any coolant. Temp gauge was normal. Put cap back on, and tried to start and drive again. Started, but drove badly, like starving for fuel. Pulled over. Called RACV guy. He noticed the pressure as he took the cap off, and said blown head gasket. Also noted lots of gurgling in overflow bottle again. Switched to petrol, and ran engine with cap off. No bubbles or tell tale signs of blown head gasket. Poured water over converter to de-ice it. Switched back to gas. Started fine, and idled well again. Suggested thermostat not opening properly. Drove home to switch cars, which was not more than about 4 or 5 km. Fecking thing iced up again in that distance. Got it home carefully. My normal mechanic says he thinks it's more than just a dodgy thermostat. I hope he's full of sh.t. He says it MUST have air pockets, but what I can't understand is why it took next to no coolant. I've bought a replacement thermostat, which I'll replace tonight anyway, but was looking for advice on what others may think. Water pump was done when the timing belt was done about 40,000km ago, so it shouldn't be that. Thanks, Crash Lander  SignatureI'm not always right, But I'm never wrong! > Apart from the badge on the grill! > 96 3.5L DOHC Pajero on gas. [quoted text clipped - 22 lines] > Thanks, > Crash Lander Make sure the manifold and converter are actually getting water flow , x series falcons used to get blocked converter hoses and would exhibit this very behavior. Unhooked the top hose on the converter. Water flowed out of the converter!! Water is obviously flowing through it, so why does it ice up? Also, it builds up a massive amount of pressure in the radiator in almost no time! Switch the engine off, and the radiator bubbles and gurgles like mad!! Replaced the thermostat this morning. Would have had more fun flushing the $70 down the toilet! I'm at a loss now. Crash Lander >> Apart from the badge on the grill! >> 96 3.5L DOHC Pajero on gas. [quoted text clipped - 27 lines] > series falcons used to get blocked converter hoses and would exhibit this > very behavior. > Apart from the badge on the grill! > 96 3.5L DOHC Pajero on gas. [quoted text clipped - 22 lines] > Thanks, > Crash Lander Thermostat is the sus item. IMHO. Had one of those (in another model Mitsubishi) go faulty (or at the very least show the nastier side of it's nature while I was doing a high speed 'test'. Stalled out the water pump/V-belt in the process of boiling the coolant back-arsewards. Most interesting result indeed. Left absolutely Nil coolant in the system by the time it was all over. Because of the spectacular nature of the failure, I got to stop the engine real fast, so it all survived well enough, and dammed if I don't say it, the tool kit as supplied with the car was enough to get the knackered thermostat out, too. Amazing. Big Hint: While you're at it with the fixits, get thee to the parts shop and buy then replace the oil pressure sender unit. If you get to do that about now, you won't need to replace the engine any-time soon instead. I don't believe Mitsubishi has done anything much about either the thermostat problem or the oil pressure switch problem of failure in service. But you can. By keeping them relatively new. SignatureToby. quidquid latine dictum sit, altum viditur > Apart from the badge on the grill! > 96 3.5L DOHC Pajero on gas. [quoted text clipped - 23 lines] > Thanks, > Crash Lander Converter freezing up is caused by lack of coolant flow. That can be caused by a thermostat stuck closed and blocking flow, or a blockage in the hoses. The converter itself can be blocked but that would generally only happen if you run mud in your cooling system. The bubbles could also be gas leaking through the converter diaphragm if it has been perforated, but that shouldn't really cause freezing up though it will prevent the engine from running on gas. Thermostat or blockage most likely cause. >> Apart from the badge on the grill! >> 96 3.5L DOHC Pajero on gas. [quoted text clipped - 35 lines] > > Thermostat or blockage most likely cause. The converter had a kit put through it about a month ago. Crash Lander >>> Apart from the badge on the grill! >>> 96 3.5L DOHC Pajero on gas. [quoted text clipped - 37 lines] >> > The converter had a kit put through it about a month ago. That doesn't mean much when you never had a problem before that was done. My experience with LPG people is that most don't have a clue, so if you find a good one make sure you hang on to them. If as you say the coolant level is ok, then the number one cause of this problem is an air-pocket in or around the converter. This can be a huge problem depending on where the converter has been plumbed into the system, and what height it has been physically installed. Easiest way to fix is to bleed it by loosening the hose at the converter just enough for it to leak slightly and running for a few minutes when hot & under pressure. I had this problem on an EB Flacon, almost in perpetuity. However!! That should not cause pressure or gurgling. If that is only happening on gas, then chances are you have a leak inside the converter. Doc > Apart from the badge on the grill! > 96 3.5L DOHC Pajero on gas. [quoted text clipped - 23 lines] > Thanks, > Crash Lander |
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