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Topic: Overheating Cosworth........... (Read 443 times) |
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Scorpio_Dan
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Overheating Cosworth...........
« on: Jul 21st, 2023, 8:45pm » |
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Earlier this year poor Scorpy overheated - dodgy original thermostat I thought.
Replaced the stat and thought - yep - all done...........
Nope. She got hot after a few miles and refused to cool down.
Haha I thought - noisy water pump. Fitted new pump with the mods needed and new hoses to reposition the stat.
Tested, heated up and fans come on. Fans go off......sorted again yes??
Nope, 3 miles in from journey home from work, she brewed up again.
Top hose heated up from cold, stat opens, bottom hose gets hot. Engine
overheats. Rad is cold. No water flow it seems.
Anyway, heads off to check for blockages. I had an idea that the head
waterways were blocked.
 https://live.staticflickr.com/65535/53061969765_88956c5f1f_c.jpg" alt="" border="0">DSC_0545 by Dan Gearing, on Flickr
https://live.staticflickr.com/65535/53061001182_89bc49eb16_c.jpg" alt="" border="0">DSC_0548 by Dan Gearing, on Flickr
Block, both heads and gasket solid blocked up!!!! 
How did she run for so long??
Heads are off being skimmed now, I have unblocked and flushed the block,
pipes, back flushed heater matrix and drilled the head waterways as it was
solid!!!!
Dan
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cobrascim
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Re: Overheating Cosworth...........
« Reply #1 on: Jul 24th, 2023, 2:14pm » |
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Jeez Dan. Some job! Surely that should be you now. Will be like a new car by the time you're finished. Mine is also overheating and i have just bought the new stat available from CBS. Now I am worried. Roasted my forearm to second degree burn when it overheated and I stupidly thought I would be faster than the steam/water coming out the bottle. I had never seen skin melt off before. Better now but thought that it had iced initially as it was during winter, I really should know better than that. But now I'm getting idiotic as I get older. Anyway hope this fixes it and hope mine is not the same.  . John.
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Scorpio_Dan
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Re: Overheating Cosworth...........
« Reply #2 on: Jul 24th, 2023, 9:22pm » |
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Oh No John! That's some injury!
I fitted that stat from CBS also but I replaced the pump so required the pipe mod.
The missus not too happy as Scorpy is down again, cue her insults!
I have a centre prop bearing to replace at the same time, as the exhaust manifolds are off etc I think it would be easier to get to it.
Tonight I have been cleaning up the block and valves etc.
I do hope you do not have the same issue, it's a messy job.
Dan
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cobrascim
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Re: Overheating Cosworth...........
« Reply #3 on: Jul 25th, 2023, 11:01am » |
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I can imagine bud! My missus is always at me to get rid of things especially my 1979 Scimitar which I have had sitting in rebuild mode for some time now mainly due to house move mind you. Gonna try and see if i can get a good water channel cleaner through my cossie engine before I do anything else see if I get a load of crap out of it. Good luck with yours. John.
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cobrascim
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Re: Overheating Cosworth...........
« Reply #4 on: Aug 6th, 2023, 5:33pm » |
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So new thermostat fitted and engine flushed through twice with the Wynns coolant flush. Filled with fresh antifreeze and hopefully this will cure the overheating issue. MOT on Tuesday. Still got a battery drain issue. When reconnecting the battery via my meter it starts at 0.5A dropping to 0.2A after a few seconds. So I will need to trace this issue next.
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Scorpio_Dan
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Re: Overheating Cosworth...........
« Reply #5 on: Aug 10th, 2023, 12:10pm » |
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Update time.....
Scorpy is back together now , i had issues with the rocker cover gaskets not sealing so it got stripped down to fix this.
I had a problems bleeding the coolant, removed the thermostat and drilled a 3mm hole in the outer ring. Cured this issue.
I need to get some confidence back in her now.
New windscreen also fitted finally. Cracking job done - it was her first screen replacement.
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cobrascim
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Re: Overheating Cosworth...........
« Reply #6 on: Aug 11th, 2023, 12:09pm » |
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Hi Dan. I soooo hope you dont have any more problems for a long, long time. These cars should give a lot more pleasure but have usually got to a neglected stage by the time we get them. One of the biggest problems I had when I took the inlets off was disconnecting and then trying to reconnect the EGR valve stupidly mounted under the back end. What a pig of a job that was. If I could re-program an EECV I would do away with a few things. John.
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Nunnspoet
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Re: Overheating Cosworth...........
« Reply #7 on: Aug 12th, 2023, 9:12am » |
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A one pence placed on on the underside of the Inlet manifold and the bracket used to hold it in place sorts it. Same thing where the EGR valve is joined to the exhaust manifold. Ditch the EGR it makes no difference to performance. It is many years ago that I did this to both of my Cossies. It is a simple easy job and it means that if you need to remove any part of the Inlet manifold there is no problem with regard to unwanted air ingress.
Happy days
Mike
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cobrascim
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Re: Overheating Cosworth...........
« Reply #8 on: Aug 12th, 2023, 2:23pm » |
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on Aug 12th, 2023, 9:12am, Nunnspoet wrote:A one pence placed on on the underside of the Inlet manifold and the bracket used to hold it in place sorts it. Same thing where the EGR valve is joined to the exhaust manifold. Ditch the EGR it makes no difference to performance. It is many years ago that I did this to both of my Cossies. It is a simple easy job and it means that if you need to remove any part of the Inlet manifold there is no problem with regard to unwanted air ingress.
Happy days
Thanks Mike. I will do just that with next strip down. Already done away with my cats as the pick up is on a Q plate anyway. I was too busy with the wiring but should have realised there is no electrical connection to the EGR and done away with it at the time.
John.
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Scorpio_Dan
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Re: Overheating Cosworth...........
« Reply #9 on: Sep 3rd, 2023, 5:46pm » |
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So, went to Colchester this week and she ran very well.
Tuesday however, the bypass pipe decided to split just above the thermostat!!! AA recovered back to where we were staying.
Managed to bung the bypass pipe with a 25ml thimble measure and run the engine with no stat. I fitted the rad bottom hose direct to the pump inlet!
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Scorpio_Dan
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Re: Overheating Cosworth...........
« Reply #11 on: Sep 27th, 2023, 8:11pm » |
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Scorpy passed MOT this morning. No advisories 👌👌💞
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cobrascim
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Re: Overheating Cosworth...........
« Reply #12 on: Sep 28th, 2023, 12:17pm » |
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Super Dan! In fact change your name to that after all the issues you have had! 
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cobrascim
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Re: Overheating Cosworth...........
« Reply #13 on: Mar 14th, 2024, 11:53am » |
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Hi again Dan. Just reading through and looking at your pics. with regards to that mondeo thermostat - is that like a unit that comes apart and you can replace the thermostat inside it in the future. I see it has bolts in it. Or is it a sealed unit similar to our 24v one?
on Sep 27th, 2023, 7:30am, Scorpio_Dan wrote:
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Scorpio_Dan
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Re: Overheating Cosworth...........
« Reply #14 on: Mar 14th, 2024, 12:22pm » |
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Hi Cobra, yep it is a Mondeo 24v/Jaguar V6 unit. It does indeed split so you can fit a new stat or change the stat to a different temperature one etc.
It does not fit up in the gap behind the AC pump due to the flanges for the bolts. I have kept this stat with my new waterpump so hoses rerouted to suit.
I'll get some pics when I can.
Just getting boot sorted after she was hit by a reversing landy. ffs
Dan
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cobrascim
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Re: Overheating Cosworth...........
« Reply #15 on: Mar 14th, 2024, 12:50pm » |
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Might be sensible to do that mod also when I get a new air con compressor.
That's rubbish about the Landy! Blooming typical after all your work.
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