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Mar 23, 2010 23:24:16 GMT
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Car is a standard 1256cc Chevette.
For a while he's been getting VERY hot, not overheating just running hot. Today, he felt like he was holding back under load and started chugging (best way to describe it). Opened the bonnet up and oil was bubbling at the dip stick and filler cap suggesting high pressure.
I've jumped to the conclusion of head gasket failure but he does still start, run and rev well which confused me. I have ordered a head gasket kit and plan on doing this at the weekend as well as fitting a different inlet manifold and carb (which I planned to do anyway).
New plugs and leads will be fitted too and all tuned up of course.
Think this is a good plan of action?
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craig
Posted a lot
Posts: 1,029
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That's what I'd do to start with, it wont hurt. Take the hoses off and give the rad and motor a good flushing out and maybe check the thermostat too? Does the top hose get hot?
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`state
Yorkshire and The Humber
Posts: 1,215
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Doesent really sound like a hg imo.Is the stat opening ok and is the waterpump working ok? Sounds more like the finns on the pump have worn away and its not pushing the water around the engine.So the water is just sitting there not cooling through the rad,so the oils getting way hot and bubbling.
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Look at all the plastic people who live without a care.Try to sit with me around my table,but never bring a chair.
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Mar 24, 2010 19:43:05 GMT
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Okay guys,
Waterpump and stat have already been replaced.
I've decided to discount head gasket failure as there's none of the usual signs: no overheating and no mayonnaise or mixing of oil and water.
The distributor had come loose so have temporarily turned and tightened it up so that the engine runs smoothly.
Only roughly set until I can get a timing light, currently it seems to be running well just rinsing a LOT of petrol, any ideas?
PS. Worth noting is that a rubber pipe from inlet manifold to airbox sensor had perished as had another going to the airbox so will replace them tomorrow and see how it goes.
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Mar 24, 2010 20:20:58 GMT
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Lol @ calling car 'he' and not 'she'. Give it a flush through, especially the radiator. Doesn't sound bad, but might be a sign of bad times ahead.
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craig
Posted a lot
Posts: 1,029
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Mar 24, 2010 21:05:14 GMT
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Make sure the choke's working as it should and not sticking.
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Steve
Posted a lot
Making progress in small, easy to handle chunks of awesome
Posts: 2,034
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Mar 24, 2010 21:14:17 GMT
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I don't suppose you noted if the thermostat that you fitted was the same temp range as the original? Also, when i did the HG on my 1256, i also changed the water pump&'stat at the same time but i also modified my 'stat by drilling a small bleed hole through the flat outer rim and put it into the housing with the hole at the highest point........just cos i was paranoid with the thought of the engine blowing its top again but havent had a prob for the last 1000miles, not even needed to top up the coolant ;D Steve
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pbottomley
Posted a lot
If at first you don't succeed, then skydiving isnt for you
Posts: 1,135
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Mar 24, 2010 21:45:47 GMT
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Dip stick lifting up and leaking oil indicated high crank case pressure, sounds like the normal blocked breather hose from rocker cover to carb..... best you get around to an oil flush and some fresh oil fella....
Secondly timing out will cause engine to run hot and will possibility be low on power.
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Mar 24, 2010 22:54:29 GMT
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Dip stick lifting up and leaking oil indicated high crank case pressure, sounds like the normal blocked breather hose from rocker cover to carb..... best you get around to an oil flush and some fresh oil fella.... Secondly timing out will cause engine to run hot and will possibility be low on power. agree timing and breather hoses before anything else
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Mar 24, 2010 23:41:01 GMT
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I've had a chevette head gasket failure with exactly these symptoms... was blowing from no 2 into the pushrod tunnel! Huge case pressure, overheated, bubbly thin oil, massive fuel consumption, all present.
It is good advice to check all the other stuff first, but it's only an hour's work to change the gasket anyway.
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To get a standard A40 this low, you'd have to dig a hole to put it in
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Mar 25, 2010 23:14:47 GMT
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I've had a chevette head gasket failure with exactly these symptoms... was blowing from no 2 into the pushrod tunnel! Huge case pressure, overheated, bubbly thin oil, massive fuel consumption, all present. It is good advice to check all the other stuff first, but it's only an hour's work to change the gasket anyway. Scaryoldcortina, that does sound exactly the same! The only way to get it run normally seems to be to adjust the timing further (advanced) than it should be which is FAR from ideal! Headgasket change ahead... Violet, already flushed the rad and heater matrix and he's called a he because the previous owner instructed me he had to be as he was called Hoov (the numberplate). craig, chokes working fine (runs far better with it on in fact). sleeperviva, thermostat is the right one (rads the smaller of the two Shove-it rads so was getting a bit warm). Runs better with a stat though than without. pbottomley, have run it with a breather hose between oil filler cap and airbox and also have tried a breather filter and blocked airbox hole (neither seem to have any difference). Has just had an oil change and flush 1000 miles ago and its still silky smooth (if not a little too smooth, see scaryoldcortina's comment). billybunter, see above regarding advanced timing making the engine run better. Thanks to all of you, these suggestions really do help and confirm a lot of what I had in mind.
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Mar 27, 2010 12:49:10 GMT
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Any progress on this? Have you thought about a newer 8v engine?
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B-8-D
Posted a lot
down to one car!!
Posts: 4,038
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Mar 27, 2010 12:55:38 GMT
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for how simple it is i would just fit the new HG.. replace the breather pipe to the intake manifold too as its prob leaking air and causing it to run lean which in turn can make it run hot.. also check the cvarb diaphram prob a cause of the lack of power and increased fuel..
also make sure its timed correctly..
all easy stuff and wont take you long.. si
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Mar 27, 2010 14:30:14 GMT
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Any progress on this? Have you thought about a newer 8v engine? Got one to offer? The gearbox seems to be the challenge when considering that as an option.
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Mar 27, 2010 14:32:17 GMT
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for how simple it is I would just fit the new HG.. replace the breather pipe to the intake manifold too as its prob leaking air and causing it to run lean which in turn can make it run hot.. also check the cvarb diaphram prob a cause of the lack of power and increased fuel.. also make sure its timed correctly.. all easy stuff and wont take you long.. si Will be working on him this afternoon so will be sure to do these things! Looking around the base of the head its really crusty at the back as if the gaskets been leaking so thats definitely on the agenda. The breather pipe at the moment doesn't fit well so you may be right with that, will get one ordered. I have a diaphragm in stock so may as well do that at the same time. Thanks for these sugestions, will hopefully update this evening. Andy.
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