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Car Forum / Volkswagen / Water Cooled Volkswagen Cars / March 2009Polo engine noise
I have a Polo 1.4 (1998) that has gradually become noisy at the top end. Sounds like a single noisy tappet, apparent on startup, then goes away for a little while until the engine warms up, and comes back. On icy days the noise is so loud on startup that it sounds like a knocking, but then quietens down. Is anybody familiar with this problem? >I have a Polo 1.4 (1998) that has gradually become noisy at the top end. > Sounds like a single noisy tappet, apparent on startup, then goes away for [quoted text clipped - 4 lines] > > Is anybody familiar with this problem? Could be a tapped. You could try thicker oil. If this doesn't help then check the tapped(s), they should have no more then 0,2mm clearance when pressed in. SFC > Could be a tapped. You could try thicker oil. > If this doesn't help then check the tapped(s), they should have no > more then 0,2mm clearance when pressed in. Thanks for your reply. I forgot to mention that the engine has done 96,000 miles, so it's not particularly 'old'. I have already changed the oil from 10/40 to 15/40 and the noise persists. I'm used to the old "rocker box" type of tappets, where you can easily get access, loosen the locking nut, turn the screw a quarter turn, and tighten the locking nut. I have no idea how hydraulic tappets work, how difficult it is to get at them, and how difficult it is to adjust them. Any further advice at all would be most welcome. > I have already changed the oil from 10/40 to 15/40 and the noise persists. That oil change will make no difference to a warm engine. You'd need to go to a 50 for any difference once the engine's hot. > I'm used to the old "rocker box" type of tappets, where you can easily get > access, loosen the locking nut, turn the screw a quarter turn, and tighten > the locking nut. I have no idea how hydraulic tappets work, how difficult > it > is to get at them, and how difficult it is to adjust them. You can't adjust a hydraulic tappet as they're self adjusting. The can fail though so it might be worth getting them all done. Shouldn't be too expensive especially on yours assuming it's an 8 valve engine. David > You can't adjust a hydraulic tappet as they're self adjusting. The > can fail though so it might be worth getting them all done. Shouldn't > be too expensive especially on yours assuming it's an 8 valve engine. Thanks Dave. I'll look into getting the tappets changed. >> Could be a tapped. You could try thicker oil. >> If this doesn't help then check the tapped(s), they should have no [quoted text clipped - 12 lines] > > Any further advice at all would be most welcome. You have to remove the cam to get at them. This also involves removing the cambelt from the sprocket etc. Not something you do in a half an hour like in the old days..... SFC > Not something you do in a half an hour like in the old days..... lol! And they call it 'progress' :-) Well the progress is of course that you never have to adjust the valve play which saves on maintenance. SFC >> Not something you do in a half an hour like in the old days..... > > lol! And they call it 'progress' :-) > Well the progress is of course that you never have to adjust the valve > play which saves on maintenance. Sure -- it was just my little joke. Incidentally, I changed the oil a couple of days ago and added a can of Wynn's "hydraulic valve lifter concentrate". It might be wishful thinking at this early stage, but I feel sure that the engine is quieter today. > You have to remove the cam to get at them. This also involves removing the > cambelt from the sprocket etc. Not something you do in a half an hour like > in the old days..... > > SFC It's not much work over a cambelt change though: I did my MK2 Golf, including the belt, in a few hours. > It's not much work over a cambelt change though: I did my MK2 Golf, > including the belt, in a few hours. I agree, the golf mk2 has a very simple engine with good acces to all the pulleys etc. Maybe it's a good idea to also replace the belt at the same time. SFC > I agree, the golf mk2 has a very simple engine with good acces to all the > pulleys etc. > Maybe it's a good idea to also replace the belt at the same time. > > SFC Access might be harder with a modern Polo of course, but It would still be a good idea to replace the belt, as you say. |
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