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Aug 30, 2016 19:35:17 GMT
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I had to screw mine in. It sounds like at the moment it is less likely to be the gasket, I'll still get round to doing the full test though.
Okay in a House MD style:
Differential diagnosis for a car that overheats after an hour on the motorway followed by a traffic jam.
The fan is running and blowing the right direction.
I believe the thermostat is open and working.
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Aug 30, 2016 19:49:32 GMT
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Blockage ? Knackered kinked pipe ? Loose pipe ?Cracked rad ? Take out the thermostat and test it !
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bstardchild
Club Retro Rides Member
Posts: 14,971
Club RR Member Number: 71
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Aug 30, 2016 19:56:46 GMT
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I had to screw mine in. It sounds like at the moment it is less likely to be the gasket, I'll still get round to doing the full test though. Okay in a House MD style: Differential diagnosis for a car that overheats after an hour on the motorway followed by a traffic jam. The fan is running and blowing the right direction. I believe the thermostat is open and working. Are you losing water/coolant? Has the thermostat been removed - people can mistakenly think that it's a cure for overheating but depending on the circuit flow removal can actually cause overheating? If it (the thermostat) is in there is it the right temp range? What's the temperature of the Inlet and outlet of the Rad when it's overheating I use one of these for all my temperature related diagnostic work |
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Aug 30, 2016 20:00:51 GMT
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Down to £20 ? Thats fantastic.
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bstardchild
Club Retro Rides Member
Posts: 14,971
Club RR Member Number: 71
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Aug 30, 2016 20:07:03 GMT
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Down to £20 ? Thats fantastic. Daft isn't it - had the same one for 6 years or more - never replaced the battery yet and yes it was £50 when I bought it Such a useful tool |
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Aug 30, 2016 20:10:06 GMT
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I never really looked at them as i have only seen sealey ones for £120 or so . Well surprised.
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bstardchild
Club Retro Rides Member
Posts: 14,971
Club RR Member Number: 71
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Aug 30, 2016 20:13:45 GMT
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I never really looked at them as i have only seen sealey ones for £120 or so . Well surprised. I originally bought one to balance the radiators in the house - cheaper than getting a plumber in to do it and fairly easy too once you get your head round it. Then I had a motorcycle with a miss/rough running and measuring the down pipe temps showed me exactly which cylinder was the issue since then anything where a temp reading in places would be useful it's called into action |
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GavinJ
Club Retro Rides Member
MGB 3.9 v8 Sebring
Posts: 927 
Club RR Member Number: 209
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Aug 30, 2016 20:19:15 GMT
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My mgb v8 conversion has been a complete nightmare on overheating, it actually overheated just as I pulled onto the field Sunday 👎🏼 And lost approx 3ltrs of coolant out of the expansion tank, yet all the way to show on the motorway the temps were fine....
I've got an uprated rad and fans, perfect compression test results but still overheating.
However, I think I have found the cure! As by the time I had got back from the gathering it was red hot again 😡 I was getting utterly curse word off at this point, so put it in the garage (with the door open) topped up the coolant and just let it tickover to see exactly what was going on? Was the coolant gradually leaking? Was it sudden overspill? So 30 mins went by and a steady oil temp of 87 and temp gauge at 2/3rds? Spot on so I then got brave and left it running whilst I went into the house to grab a cuppa and 45 mins later still a stable temp and no coolant loss, 1 hour later and again no change?!? So the only change I had made was I'd left the bonnet up so popped the bonnet down and bingo the temp started to rise....
So my issue seems to be a lack of ventilation in the bay? so gonna space the bonnet hinges and add some landrover wing vents, nice and easy to just pop rivet on - a coolant level check once cold confirmed it had not lost (or used) any coolant either.
So my advice would be to try and make it overheat in a controlled environment? Look for leaks, check levels before and after, try it with the bonnet up and down etc.
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Last Edit: Aug 30, 2016 20:23:59 GMT by GavinJ
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Aug 30, 2016 20:20:38 GMT
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so if its fine when travelling but gets too hot when stationary I'd discount the thermostat, unless its running too cold till then.
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bstardchild
Club Retro Rides Member
Posts: 14,971
Club RR Member Number: 71
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Aug 30, 2016 20:40:18 GMT
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So my issue seems to be a lack of ventilation in the bay? so gonna space the bonnet hinges and add some landrover wing vents, nice and easy to just pop rivet on - a coolant level check once cold confirmed it had not lost (or used) any coolant either. So my advice would be to try and make it overheat in a controlled environment? Look for leaks, check levels before and after, try it with the bonnet up and down etc. Good methodology - rather than spacing out the bonnet what about some bonnet louvres - looks more period and will work better than bonnet hinge spacing and keep the heat away from the heater box inlet in the scuttle (I think that's where the inlet is on a MGB from memory) I have some MKII Astra GTE bonnet vents to put in the monzadore bonnet - trying to keep it Opel :-) The thing to remember about bonnet vents is remember to anticipate where rain water is going to go My LC has two bonnet vents and they actually allow rain water in right over the front chassis rails!!! |
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Aug 30, 2016 21:00:24 GMT
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You need to find out where the optimal low pressure area is on the bonnet (usually each side half to 2/3 up from the leading edge). That's where you place the bonnet vents to extract hot air out. Raising the bonnet railing edge is a high pressure zone so will force cold air into the engine bay. My mini bonnet to keep the redtop cool  |
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Aug 30, 2016 21:28:52 GMT
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Having seen a lot of your issues, I'd be all over it with a fine tooth comb and check everything. Thermostat, flush etc. The SR is quite well known for being a mare to bleed, little bypass valve in thermostat needs to be at top or remove it and drill it out a bit bigger.
If it's happening in traffic, I'd be looking at heat from the turbo and getting it out the engine bay.
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1977 datsun 810 180b estate |
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Jan 17, 2017 15:43:40 GMT
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RANDOM UPDATE TIME!
Okay so whilst nothing has happened on this since August 30th I have actually been fiddling and planning. I'll upload a video as soon as I've reassembled the cooling system, but in the mean time I'll say I've taken apart the whole of the cooling system with an aim of re-doing the radiator.
Current jobs :
Cooling :
Source good Volvo 940 Turbo rad and fit
Mount 2 thin fans to rad
Source and fit full length Water neck
Source and fit Cam Angle Sensor Cover
Source and fit standard SR20DET Thermostat outlet pipe
Refit/make all Samco type hoses
Wheels :
Get centerbore adjusted on front and rear wheels
Get Richbrook small Aluminium valves and fit
Get tyres fitted
Get new/matching wheel nuts all round
Fit wheels
Suspension :
Get AE86 weld on adjustable coilover front suspension kit (BC Racing or similar)
Get above welded on to struts
Get Roll Center Adjusters fabricated (35mm-ish) and fitted
.Drive car.
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mattiwagon
Part of things
Just got a work truck
Posts: 445
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Jan 17, 2017 18:27:00 GMT
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Lists make things look sooooooooo simple don't they"
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If they cant be nice f**k em!
84 low t25 panel 1.9td beige and rust combo
97 Goped Bigfoot G260RC with clutch conversion
97 Impreza turbo 2000 builders wagon 76k sold
04 Fabia vRs 50mpg pocket rocket
04 battered T5 pickup in blue!
Chainsaws lotsa Chainsaws
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Jan 17, 2017 20:03:30 GMT
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As for where to put vents. Leave it out in the cold that the bonnet has a good coating of frost. Can be helped with a light spray of water late night. Start in the morning. Mark where the ice melts first. There are your hotspots...
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As for where to put vents. Leave it out in the cold that the bonnet has a good coating of frost. Can be helped with a light spray of water late night. Start in the morning. Mark where the ice melts first. There are your hotspots... Nice idea, except you don't want to put them at the hotspots but rather at the point of lowest pressure to ease flow out from under the bonnet. *n |
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Top grammar tips!
Bought = purchased. Brought = relocated
Lose = misplace/opposite of win. Loose = your mum
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RANDOM UPDATE TIME! .Drive car. Yes. This. Excellent. *n |
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Top grammar tips!
Bought = purchased. Brought = relocated
Lose = misplace/opposite of win. Loose = your mum
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My plan with bonnet vents currently is to not have them if I can avoid it. There are a few other SR20DET powered B310s and they don't have them, one of them is a race car.
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Jan 18, 2017 13:35:01 GMT
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Quite often a deflector plate on the top of the radiator or fan shroud yields good results. I built a Hilux with a Sbc in it. Endless overheating issues until I cut two vents where the hotspots were. Guess it must have coincided with a low pressure area then.
Friend then built one. Exactly the same overheating problems to start, but with a deflector plate behind the radiator problem solved. No vents needed.
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Nathan
Club Retro Rides Member
Posts: 5,650
Club RR Member Number: 1
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Jan 18, 2017 16:29:05 GMT
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Back to basics, you have "Burped" the system?
Forgive me if that has been covered, but it tripped me up a while ago.
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