Unexplained Overheating ! Advice Needed
#16
Posted 24 July 2020 - 06:33 PM
#17
Posted 24 July 2020 - 06:36 PM
As Pops has suggested, depending on what you find, you may have to clean them first by mechanical means and then use a chemical cleaner.
For mechanical cleaning, I have used old drill bits, starting smaller and working up to the size of the holes I'm going through. I try them by hand first, but even in a cordless drill is OK. You can blunt them if you are worried about drilling in to things that you shouldn't. These won't reach everywhere though. As well as going in through the deck, there's also the drain plug on the back of the block, and in through the water pump too. You can follow this up with circular wire brushes or if you can find them, Boil Tube Cleaners, which you can also use on a cordless drill. This mechanical cleaning will only get you so far though.
Once you have the car re-assembled, fill the cooling system with water and so a couple of heat cycles so you can retorque the gasket down then drain the water and flush as there'll be a fair bit of crud that will come out from the mechanical cleaning. I found that all the off the shelf 'Radiator Flushes' are next to useless, however I've had great success with a product you can get from the hardware called CLR (Calcium Lime Rust), mix so up in about a 30 / 70 mix with water and fill the cooling system with that (be sure to turn the heater on) and run with it for a few days, up to a week. Again, depending on how bad it is, you may need to repeat this a few times, flushing with clean water in between until you get little discolouring of the fluid after it's been in for a few days.
If however, you find there's oil in the cooling jacket, you'll need to clean that out first before using the CLR.
After you get it clean and if the temps seem to be behaving, flush the system out for a good 20 minutes with clean water, then fill he system with a good quality coolant / inhibitor.
#18
Posted 25 July 2020 - 09:36 AM
Looking at the photo of the head it appears that cylinders 3+4 are much leaner than 1+2, are you running twin carbs?
When you say overheating in 8 minuets is this at idle or being driven ?
#19
Posted 01 August 2020 - 06:29 AM
Thank you all for your comments. The engine head will be skimmed on Monday and i will replace the head gasket. I will also do the mechanical and chemical cleaning of the cooling system this weekend to make sure we have no blockage. Another possible problem to overheating is my HS4 carburetor, too lean or too rich.
#20
Posted 01 August 2020 - 08:30 AM
Most heat is generated in the head. If you're going to get it skimmed, maybe you can find somewhere with a big enough ultrasonic bath to take it first?
At the more mundane level, how's it plumbed in? It's possible for a fair bit of water to bypass the radiator depending on how the heater & other ancillaries are connected.
#21
Posted 24 August 2020 - 08:41 AM
#22
Posted 24 August 2020 - 09:00 AM
#23
Posted 24 August 2020 - 09:12 AM
#24
Posted 24 August 2020 - 10:24 AM
Edited by sonscar, 24 August 2020 - 10:24 AM.
#25
Posted 24 August 2020 - 10:57 AM
#26
Posted 24 August 2020 - 07:57 PM
#27
Posted 24 August 2020 - 08:28 PM
I´m with Pacino on this, have you checked the radiator itself yet? I see a lot of great suggestions here but I don't see anyone mention the radiator core itself. We had terrible overheating problems with our MGA, everything was fine and new but the stupid thing kept getting far too hot. Turned out the new core was flowing too well. All the coolant was just whizzing through it and not dissipating enough heat. New core as per original design fitted, hey presto cooling is instantly fine. Is your radiator new by any chance?
#28
Posted 24 August 2020 - 08:40 PM
#29
Posted 24 August 2020 - 09:36 PM
Cal
#30
Posted 25 August 2020 - 04:38 PM
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