David
79 posts
Joined: 02/10/2004 12:31:42
Location: SHEFFIELD United Kingdom (Excluding channel Islands)
bypass hose
Just check your water pump does not have the outlet for the bypass hose
Posted: Dec 01, 2004 10:24 AM
Pablo
142 posts
Joined: 28/10/2004 09:04:37
Location: Glossop United Kingdom (Excluding channel Islands)
You say you replaced the bypass hose and yet it is still leaking? Do you mean still leaking from the hose? if its a new hose, properly clamped up, it shouldnt leak. Unless there is some weird pressure problem that split the new hose straight away! Make sure its a proper straight hose, not a consatina one which are only meant to be emergency replacements. Is the water leaking from the water pump gasket instead?
Posted: Feb 17, 2005 11:49 AM
James
7 posts
Joined: 29/06/2005 16:40:46
Location: Hove United Kingdom (Excluding channel Islands)
Exploding Bypass hose
Hi there, hoping for some advice with a re occuring problem I am having. I have a 998cc mayfair. I have had three bypass hoses in the last three months and the one on there at the moment looks set to burst. When i change the hose, once it has busrt, all is fine for about a week, the temp gauge sits in the middle no problem. After a week the temp starts to go up a bit, when still in taffic it goes up a lot, when moving it goes back to normal. After a few days or a week or two or three of this it goes POP. when I check the hose I often notice small trickles or beads of water on the outside of the hose, cant really work out if it is oozing from small tear or coming out from the top where the clip is????????, I do often see coolant stains on the outside of the hose. after driving the car, if I chaeck under the bonnet the hose always looks swollen. what is the likely cause of this problem, what do I need to do to fix it. the engine runs fine, although it does use quite a bit of oil, lots of white smoke when starting up in the morning, dont know if this is related.
Posted: Jul 07, 2005 10:01 PM
Twin DTM
1 posts
Joined: 28/01/2005 16:15:58
Location: BROMLEY United Kingdom (Excluding channel Islands)
Can anybody help. Fitting a bypass hose?
I have an 82 mayfair and after struggling for hours, i eventually got the old bypass hose off, trying to get the new one on is proving to be a nightmare? Can i get the new one on easily enough without taking off rad, pump etc? Also how do i go about fixing the petrol gauge?
Posted: Aug 13, 2005 09:42 AM
Rob
34 posts
Joined: 17/09/2004 20:29:45
Location: Wellingborough United Kingdom (Excluding channel Islands)
Bypass hose
Honestly, the best way is to take out the rad and remove the water pump. Then fit a proper bit of straight hose, not one of those horrid concertina type things. A straight bit of hose will last you years whereas the replacements usually supplied are notorious for early failure. Better to spend 2 hours taking out the rad etc and doing the job properly.l Better still, do what I did and fit a later head ( which will also mean you can run on unleaded) with no bypass hose and plug up the outlet on the water pump. The only other thing you need to do is drill 5 or 6 3/16th inch holes in the perimeter of the thermostat to allow some water circulation until the thermostat opens fully. as to the fuel guage problem, have you checked the wiring on the back of the insrtument binnacle? obvious I know. Another thing to check is the voltage stabiliser, which is plugged into the back of the instrument binnacle printed curcuit. If this packs up, you will get all sorts of weird guage readings. Hope this helps Rob
Posted: Aug 14, 2005 03:12 PM
Bobster
71 posts
Joined: 23/08/2007 15:49:09
Location: Barnsley United Kingdom (Excluding channel Islands)
What purpose does a bypass hose on a water pump serve?
I am replacing my water pump, and the bypass hole on my pump has been blanked, but it seems the pump has come off an earlier car that has the bypass hole used.
Does anybody have any ideas of what purpose this bypass hole serves?
Regards, Rob
Posted: Mar 31, 2008 04:26 PM
Alistair
23 posts
Joined: 09/12/2007 14:44:18
Location: Callington United Kingdom (Excluding channel Islands)
Cylinder head bypass hose?
Hi guys
I keep hearing people mention in writing that they have got rid of the cyclinder bypass hose and blanked off the whole for it in the head. I understand that it is ment to help during the warming up process.
I was wandering what are the benifits for removing it, and if there are any benifits do they only apply to a tuned car or will a standard car benifit as well?
Thanks in advance
Ali
Posted: May 19, 2008 06:12 PM
John
1948 posts
Joined: 28/05/2006 16:49:46
Location: cambridge United Kingdom (Excluding channel Islands)
bypass hose wasnt fitted to all minis later minis dont use them dont have clue on dates tho. basicly when engine starts and its cold the water pump is turning pumping water around the engine. when engine is cold the thermostate is closed so it stops water circulating the radiator improving warm up time. there needs to be some water circulating or you will get hot spots where water boils as its not mixing with cooler water causing assosiated problems such as pinking/knocking or seazure. to allow flow on earlier models they fitted a bypass pipe that takes water to the water pump. on latter models they drilled holes in the thermostate that allowed enouth water to circulate. truble with bypass is its anouther thing waiting to leak when perished causing a breakdown as steam pours out of engine. u can also have water pass through far end heater valve through a manifold then back to pump this will act as a bypass pipe allowing circulation and once thermostate is open it helps cool cylinderhead more evenly, reducing chance of knocking/pinking.
so if ur rebuilding an engine then you could blank it off if not id leave it.
Posted: May 19, 2008 07:17 PM
Thanks for that, well as i'm not rebuilding the engine any time soon i shall leave it there
is looking a bit perrished though so i'll probably chuck a new one in just to be on the safe side.
Posted: May 19, 2008 09:08 PM
yes good idea
Posted: May 19, 2008 09:14 PM
mark
397 posts
Joined: 18/08/2005 14:01:28
Location: Hitchin United Kingdom (Excluding channel Islands)
if you keep the bi pass hose, always fit the solid type hose
there is nothing worse that it splitting when your miles from home
Posted: May 20, 2008 09:38 AM
don
2 posts
Joined: 17/02/2012 20:25:11
Location: United Kingdom (Excluding channel Islands)
Can i block my bypass hose
i am rebuilding a 1995 998 cc engine and it has a water pump with a blanked of by pass ,the head has a bypass tube but it has rusted away . i want to know what damage could i cause to the engine if any, if i blank the hole off. it seems to me none, but i know little about the history of this engine as its a doner and the bypass was there to give extra cooling to the head its niggerling me ?
Posted: Feb 17, 2012 08:52 PM
thanks for that i will look into the heating system on the metro.
Posted: Feb 18, 2012 07:44 PM
Batmini
168 posts
Joined: 11/03/2007 10:47:54
Location: Kidderminster United Kingdom (Excluding channel Islands)
Replace the bypass hose and fit the right water pump would be the right option to me, both are available on this site. If you can't fit the bypass yourself, any engineering factor can fit it for a couple of quid.
Mini's always behave better with the correct cooling circuit.
Posted: Feb 19, 2012 10:56 AM
daniel laloie
Joined: 21/07/2013 00:56:15
Location: lachute Canada
Hi there, i have a 998 engine that i am modifying with a 12g490 head and the original head had a bypass hose from the pump to the head. Now the 12g490 is not set up for that. I would appreciate infos about what need to be correctly done to solve this dilemna. Thank you.
Posted: Sep 14, 2013 09:50 AM
Woody
73 posts
Joined: 29/01/2008 18:58:20
Location: NORWICH United Kingdom (Excluding channel Islands)
Hi,
I would of said that the best way to resolve that problem is simply change the water pump the one without the by-pass outlet...
Part no:GWP187
Daniel
Posted: Sep 14, 2013 08:55 PM
Kevski style
105 posts
Joined: 12/09/2004 17:59:09
Location: Netherlands
Thermostat
You could use a thermostat although I dont think it will be nessesary. But If you really what to there is a way how. You can use the same method as used in your mini on de cooling systeem. Just use a bypass hose.The only problem is that you will have to find a way to blok the bypass hose of when the thermostat is open.
Posted: Dec 18, 2004 09:49 PM
jag_clarke
re
if ur 998 is early it will have a bypass hose use GWP134 if it doesnt have a bypass hose or you want to do away with it (prone to leaking can be blocked off and just use thermostate with few holes in to allow some flow in cold engine) then fit GWP187.
Posted: May 24, 2009 06:25 PM
john heppell
Joined: 06/11/2005 10:41:12
Location: york United Kingdom (Excluding channel Islands)
overheating engine
HELP!! Ive had my 1070 replaced with a 1275 bought from E bay, and on the first out the garage water poured out from an open hose. I think it might be where the bypass hose should be ( it's above the water pump under the stat on the right). My question due all cylinder heads a bypass hose fitted. Thanks for reading. Johnboy
Posted: Sep 27, 2009 05:39 PM
Tim
1849 posts
Joined: 18/10/2004 09:40:59
Location: Bournemouth United Kingdom (Excluding channel Islands)
No, they don't all use a bypass hose. You can get water pumps with the bypass already blocked off, or you can just adapt a standard bypass hose by inserting a suitable size bolt in the top and clamping it in place.
Posted: Sep 27, 2009 08:49 PM