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Car Forum / MINI / December 2003Knocking noise from engine bay or floor
I wonder if anyone can give me a suggestion what might be causing me this problem. I am a novice and I have recently bought an E-reg Mini 1000 fitted with a Metro engine and a few other modifications. A couple of weeks ago I started to get a knocking noise coming from somewhere behind the bulkhead. It is hard to tell exactly where it is coming from. It seems as if it could be near the floor but also I first thought it was a wheel. It is pretty loud, as if someone was banging the head of a big scredriver against the floor. It makes the noise when coasting, i.e. after lifting off the throttle (it doesn't do it under braking). It only does it when the car is warm, after about 15 minutes or so. The knocking seems to be related to road speed. If I turn the engine off and coast (down a hill for example), it still does it, so it's not an engine problem. The car doesn't pull to one side or anything. I took it to a local garage who found the engine mountings to be worn so he fitted a new bush kit. Unfortunately at about this time the exhaust manifold broke and it was so noisy he wasn't sure what noise I was talking about. I went to a second (better) garage and they said the knocking was probably just my exhaust system falling apart so they have just fitted me a whole new system (ouch). Then on the way home tonight I got 15 minutes into the journey and hey presto, the knocking's back. Exactly the same noise, just as loud. I'm going back to the garage tomorrow and I'm going to drag the mechanic out with me to listen to it, but just in case he doesn't know what it is, does anyone have a suggestion. Please feel free to ask more questions, but bear in mind I'm not that technical. Thanks, Michael. sounds like you need a top engine steady mount that goes from the thermostat housing to the bulkhead ????? > I wonder if anyone can give me a suggestion what might be causing me > this problem. I am a novice and I have recently bought an E-reg Mini [quoted text clipped - 31 lines] > > Michael. > sounds like you need a top engine steady mount that goes from the thermostat > housing to the bulkhead ????? [quoted text clipped - 34 lines] > > > > Michael. Hi, I came across an elusive knock similar to yours a while ago, and it turned out to be wheel nuts loose. Worth a check. Keith Check the bushes in the engine steady. I would lay money that if you grab the rocker cover and shove it the engine moves. It is more noticeable as a bang when you take the throttle off as the engine rocks backwards. In my old van I once had to do a 30 mile journey with the distributor cap banging up and down on the slam panel. Fit uprated bushes and away you go for 100000 miles ;) The Muffin Man > I wonder if anyone can give me a suggestion what might be causing me > this problem. I am a novice and I have recently bought an E-reg Mini [quoted text clipped - 31 lines] > > Michael. > I wonder if anyone can give me a suggestion what might be causing me > this problem. I am a novice and I have recently bought an E-reg Mini > 1000 fitted with a Metro engine and a few other modifications. > > A couple of weeks ago I started to get a knocking noise coming from > somewhere behind the bulkhead. You have so many options some have been mentioned by others. engine steady engine mounts exhaust or flange hitting subframe inner uni joints /cv joints outer CV joints these I would be looking at. could it be an engine steady if coasting? could it be an exhaust if coasting? could it be engine mounts if coasting? seems to be a vibration in the drive shafts CV joints which is initiating the problem. Now how long was that piece of string :) > > I wonder if anyone can give me a suggestion what might be causing me > > this problem. I am a novice and I have recently bought an E-reg Mini [quoted text clipped - 21 lines] > > Now how long was that piece of string :) Also, check the lower bracket that holds the engine steady bar to the bulkhead. They have a habit of breaking. Make sure the garage put the steel sleeves in the steady bushes when they replaced them...... seen bushes fitted without before! Check that there is a bracket from the exhaust to the diff housing. Ops comment about the CV joints may be worth looking at too. It is common, but very wrong, for people to use the outer 'can' of the inner pot joint from the replacement engine/gearbox with the original ball/cage assembly on the shaft. These must not be mixed up like this. If this has happened, they will fail soon. The problem is that different manufacturers use different ball sizes, so you can end up with small balls in big grooves (please... no comments on that.......... Makka!). You will still get drive, but the wear rate is enormous and I have seen them literally explode. So check for slack between the shaft and the inner joint.  SignatureRgds Steve steve@dsnclassics.co.uk www.dsnclassics.co.uk > The problem is that different manufacturers use different ball sizes, so you > can end up with small balls in big grooves (please... no comments on > that.......... Makka!). You aren't allowed to make your own jokes up and then complain about them at the same time ;) >You will still get drive, but the wear rate is > enormous and I have seen them literally explode. So check for slack between > the shaft and the inner joint. However, this is much ruder ;) The Muffin Man actully muffy i did not even catch that one makka > > The problem is that different manufacturers use different ball sizes, so > you [quoted text clipped - 12 lines] > > The Muffin Man > > The problem is that different manufacturers use different ball sizes, so > you [quoted text clipped - 12 lines] > > The Muffin Man Cough! So do you find you get enormous wear rate then, Muffy???! Its the slack that lets you down though. SignatureRgds Steve steve@dsnclassics.co.uk www.dsnclassics.co.uk > Cough! So do you find you get enormous wear rate then, Muffy???! Its the > slack that lets you down though. There is a certain amount of chaffing ;) The Muffin Man > > Cough! So do you find you get enormous wear rate then, Muffy???! Its the > > slack that lets you down though. > > There is a certain amount of chaffing ;) > > The Muffin Man I think this might be degrading just a bit too much now!! SignatureRgds Steve steve@dsnclassics.co.uk www.dsnclassics.co.uk ok steve i wont it hurts but i wont makka > > > I wonder if anyone can give me a suggestion what might be causing me > > > this problem. I am a novice and I have recently bought an E-reg Mini [quoted text clipped - 40 lines] > enormous and I have seen them literally explode. So check for slack between > the shaft and the inner joint. > > > I wonder if anyone can give me a suggestion what might be causing me > > > this problem. I am a novice and I have recently bought an E-reg Mini [quoted text clipped - 40 lines] > enormous and I have seen them literally explode. So check for slack between > the shaft and the inner joint. Yes, thanks guys there's some good advice there. I don't think it is the engine steady etc cos the second garage seemed to think the engine was well secured. Similarly I don't think it is exhaust related as the guy who fitted it seems to really know what he is doing. I took it back to him yesterday and he thinks it is something drive-shafty due to the fact that the knocking is in proportion to the wheel turning-speed. I've got to take it back up to him on Wednesday to have a proper look. From what I read in the Haynes manual I think it could be those inner joint things. I'll let you know what he says on Wednesday. Michael. try looking at the cv joints > I wonder if anyone can give me a suggestion what might be causing me > this problem. I am a novice and I have recently bought an E-reg Mini [quoted text clipped - 31 lines] > > Michael. > try looking at the cv joints > [quoted text clipped - 33 lines] > > > > Michael. Turned out to be a loose wheel bearing nut! Cost me a tenner to have it fixed. Thank God for that!!! cool could have been ugly though makka > > try looking at the cv joints > > [quoted text clipped - 36 lines] > Turned out to be a loose wheel bearing nut! Cost me a tenner to have it fixed. > Thank God for that!!! |
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