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Fatbloke
Joined: 26 Jun 2014 Posts: 86 Location: Royal Wootton Bassett
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Posted: Fri Jun 27, 2014 12:55 pm Post subject: |
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It might be that the oil pressure relief valve is sticking open. Had that on a mates MGB last month. |
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D4B
Joined: 28 Dec 2010 Posts: 2083 Location: Hampshire UK
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Posted: Fri Jun 27, 2014 2:12 pm Post subject: |
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Alright Fatbloke? |
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Jim.Walker
Joined: 27 Dec 2008 Posts: 1229 Location: Chesterfield
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Posted: Fri Jun 27, 2014 3:30 pm Post subject: |
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ukdave2002 wrote: |
How could the pressure be different either side of the airlock ?? It's not a closed system ?
Dave |
Dead right Dave!
Comparing a hydraulic air lock in a brake pipe is ridiculous!
If the master cylinder had unlimited travel the brakes would come on!
Anyway with a tiny bubble of air in the brakes they will often work - but with a spongy pedal. Pumping the pedal to compress the "bubble" can often produce full braking (even if not safe!).
Jim.
I suppose that the branch off to a pressure gouge could be called a "closed" branch. not that it makes any difference. _________________ Quote from my late Dad:- You only need a woman and a car and you have all the problems you
are ever likely to want". Computers had not been invented then! |
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baconsdozen
Joined: 03 Dec 2007 Posts: 1119 Location: Under the car.
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Posted: Fri Jun 27, 2014 5:23 pm Post subject: |
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The actual pressure might be the same (as once compressed the pressure in the air bubble and oil will be the same) but I found the mechanical gauge was erratic and much slower to rise with an air lock. Bleeding it made a mess and restored its normal readings at one and the same time. _________________ Thirty years selling imperial hand tools for old machinery(Now happily retired). |
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Bitumen Boy
Joined: 26 Jan 2012 Posts: 1735 Location: Above the snow line in old Monmouthshire
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Posted: Sat Jun 28, 2014 12:54 pm Post subject: |
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Had no time to do anything about this for quite a while now, but managed to steal a couple of hours this morning. Testing the temp gauge & sender with thermometer and hot water shows that gauge to be surprisingly accurate - just below 90c mark on gauge, 88c on thermometer - so it looks like a new thermostat is on the shopping list along with a few oil filters and various other odd bits. Also tried having a look at the oil pressure relief valve but couldn't quite remove it with the engine in situ, it unscrews but fouls on the chassis and won't come out. Perhaps when I have more time raising the engine slightly with a jack will provide the necessary clearance, there isn't much in it. When that might be is anyone's guess though |
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Bitumen Boy
Joined: 26 Jan 2012 Posts: 1735 Location: Above the snow line in old Monmouthshire
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Posted: Fri Jul 04, 2014 5:10 pm Post subject: |
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Quick update, a parcel of parts arrived the other day - well, I say arrive, with the whole day to choose from it came while I was out for 20 mins walking the dog, so I had to go and get it from the sorting office But anyhoo, I changed the oil filter this afternoon and went out on a quick local run to the shops, haven't been far as yet but the early signs are encouraging, oil pressure seems to be back to normal both at cold start and when up to temperature, a real differnce from when I did the same trip the other week. I have a longer trip to do tomorrow which will get it properly hot so should know for sure then, but hopefully the only thing left to do is fit the new thermostat
I still can't figure out how a simple filter could cause this problem but it does prove the value of fitting a gauge and keeping an eye on it. |
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Phil - Nottingham
Joined: 01 Jan 2008 Posts: 1252 Location: Nottingham
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Posted: Fri Jul 04, 2014 7:15 pm Post subject: |
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Was the "new" filter NOS as old filters are notorious for collapsing internally as they dry out. _________________ Rover P2
Rover P4
Rover P5 & P5B
Land Rover S2 & S3
Morris Mini Traveller Mk2 |
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Bitumen Boy
Joined: 26 Jan 2012 Posts: 1735 Location: Above the snow line in old Monmouthshire
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Posted: Fri Jul 04, 2014 8:20 pm Post subject: |
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Phil - Nottingham wrote: | Was the "new" filter NOS as old filters are notorious for collapsing internally as they dry out. |
I'd say it was new rather than NOS, I had it from a supposedly reputable supplier that presumably has a fair turnover in the things - but it was totally unbranded, the only marking being a part number, so I suspect a cheap and nasty Chinese copy. Box was branded "classic gold" but that isn't a brand I've come across before or since... Oddly enough I've used lots of NOS filters over the years and only ever had trouble with one lot, very large with a defective anti-drain valve (very important for these engines) so I had to spin the engine over for ages to get the oil flowing before letting it start. I binned that one after a week and flogged the rest on fleabay, think I near enough got my money back too That was back in the day when you could list stuff at 99p - free listing - but cover yourself by bumping up the postage charge to pretty much whatever you liked, shame they got wise to that trick |
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Bitumen Boy
Joined: 26 Jan 2012 Posts: 1735 Location: Above the snow line in old Monmouthshire
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Posted: Sat Jul 05, 2014 2:48 pm Post subject: |
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Been for a decent run today, looks like it is sorted. Thanks to everyone who took the time to share their thoughts on another odd problem |
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Phil - Nottingham
Joined: 01 Jan 2008 Posts: 1252 Location: Nottingham
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Posted: Sat Jul 05, 2014 9:08 pm Post subject: |
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But that is point with classics - its not the end of the world or a huge bill (and long delay) to fix it as with modern cars. They need regular attention for sure but at least they can be be fixed _________________ Rover P2
Rover P4
Rover P5 & P5B
Land Rover S2 & S3
Morris Mini Traveller Mk2 |
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kevin2306
Joined: 01 Jul 2013 Posts: 1359 Location: nr Llangollen, north wales
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Posted: Sat Jul 05, 2014 9:16 pm Post subject: |
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great to have a decent outcome!
kev |
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baconsdozen
Joined: 03 Dec 2007 Posts: 1119 Location: Under the car.
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Bitumen Boy
Joined: 26 Jan 2012 Posts: 1735 Location: Above the snow line in old Monmouthshire
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Posted: Sun Jul 06, 2014 12:58 pm Post subject: |
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baconsdozen wrote: | Yes a good result. I agree with the ebay comments,looking at it now they seem to have pretty much got rid of the small private sellers and the chance of a bargain.Now its mainly new,cheap tat. |
I think that's about it. I used to use it a fair bit to dispose of surplus odds and ends, even broken stuff that other people could use for spares, but it's just too much work now. Although to be fair, the real killer for me was when the Royal Mail brought in this "pricing in proportion" lark for parcels - time was I would just weigh the item, addd a bit extra for the weight of the packaging, and list it on one of the regular free listing weekends. Now to be safe I reckon I would need to parcel the thing up before listing to be able to measure up the (recycled) box as well, and of course it might hang around without selling for a while, maybe the label telling me what's in it would get smudged, perhaps I'd lose the photos on the computer and need to open it up to take new pictures... Plus ebay now won't let you list with despatch times over 3 days, so I'd have to make a special trip to the post office rather than doing it while collecting the old man's pension on shopping day. I haven't listed anything since and I reckon a lot of other small sellers have given it up as a bad job as well. |
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petermeachem
Joined: 23 Sep 2013 Posts: 358 Location: Chichester Sussex
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Posted: Sun Jul 06, 2014 2:46 pm Post subject: |
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Just use myhermes or collect plus. Confusingly myhermes collect from my door, collect plus I drop off in the local garage. Both cheaper than parcel force. They do have size restrictions |
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stevel98
Joined: 04 Apr 2014 Posts: 74
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Posted: Wed Jul 09, 2014 3:45 pm Post subject: |
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These "old" oils are plain rubbish. The cans may look good on a garage shelf but the contents are probably just recycled oil.
A good quality oil, is worth spending money on especially a decent synthetic as they lubricate way better than the old mineral stuff and last almost indefinately, so it works out cheaper. Not all sythetics are thin either.
My 150k mile Corvette uses Mobil1 Extended life 10w60 and is changed every two years or 20k miles. The old oil is still very good and is in fact filtered though muslin and reused by my neighbour for his Morris Oxford!
btw.. Duckhams was bought out by BP over 45years ago, and the green 20w50 oil we get so misty eyed about was in fact BP Visco-Static with a green dye.
Don't skimp on oil, its just not worth it for a cute old timey can.. |
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