lukyscc Posted January 9, 2009 Share Posted January 9, 2009 Hi All, I have 1994 LS400 with about 159k miles and she runns great. The only problem I have now is that Serpentine Belt make noise only during startup or when cold. I changed the belt tensioner and Idler pulleys. Still the same. What else can cause this noise? Thanks. Quote Link to comment Share on other sites More sharing options...
amcdonal86 Posted January 9, 2009 Share Posted January 9, 2009 Hi All,I have 1994 LS400 with about 159k miles and she runns great. The only problem I have now is that Serpentine Belt make noise only during startup or when cold. I changed the belt tensioner and Idler pulleys. Still the same. What else can cause this noise? Thanks. The belt itself. Replace the belt! Quote Link to comment Share on other sites More sharing options...
lukyscc Posted January 9, 2009 Author Share Posted January 9, 2009 I have replace it already. It's new! Quote Link to comment Share on other sites More sharing options...
SRK Posted January 9, 2009 Share Posted January 9, 2009 Then remove the belt and turn the various pulleys by hand - feel the alternator, water pump, and so on. A dry or failing roller bearing will make noise until it warms a bit, and that might be the problem. Also if the belt gets any antifreeze on it they will squeal. Clean it with lacquer thinner while it's off. Quote Link to comment Share on other sites More sharing options...
eatingupblacktop Posted January 9, 2009 Share Posted January 9, 2009 You can do as SRK has suggested. There is another and quicker method for finding the prob though. Get a spritzer bottle of water. Adjust it to stream instead of spray, then give each pulley a small squirt, one at a time. When the squealing stops, you've found your prob. The water allows the belt to temporarily slip on the pulley. When it dries up, the squealing will start up again. Quote Link to comment Share on other sites More sharing options...
don corleone Posted January 10, 2009 Share Posted January 10, 2009 wouldn't WD-40 or PBlaster be a good way to fix the problem. I know both are able to be used on electrical components so that would not be a issue and it should lube the part enuff to stop the squeek. Quote Link to comment Share on other sites More sharing options...
amcdonal86 Posted January 10, 2009 Share Posted January 10, 2009 wouldn't WD-40 or PBlaster be a good way to fix the problem. I know both are able to be used on electrical components so that would not be a issue and it should lube the part enuff to stop the squeek.I don't think WD-40 or PBlaster would be enough to get into the bearings and really remove any corrosion. Quote Link to comment Share on other sites More sharing options...
eatingupblacktop Posted January 10, 2009 Share Posted January 10, 2009 wouldn't WD-40 or PBlaster be a good way to fix the problem. I know both are able to be used on electrical components so that would not be a issue and it should lube the part enuff to stop the squeek. I would never use WD40 as a permanent lubricant. If there's a pulley squeaking or stiffening, it needs to be replaced. Quote Link to comment Share on other sites More sharing options...
jr1000a Posted January 15, 2009 Share Posted January 15, 2009 wouldn't WD-40 or PBlaster be a good way to fix the problem. I know both are able to be used on electrical components so that would not be a issue and it should lube the part enuff to stop the squeek. I would never use WD40 as a permanent lubricant. If there's a pulley squeaking or stiffening, it needs to be replaced. My 94 LS400 I bought a month ago, just broke the drive belt. Feeling the pulleys, I found that the fan clutch brackt pulley had froze up solid. Didn't have any warning either. Find out which pulley is squealing before you break down and have to wait for parts. (I am a new member and this is my first reply, hope I didn't pull a fopah of any sort) Quote Link to comment Share on other sites More sharing options...
eatingupblacktop Posted January 15, 2009 Share Posted January 15, 2009 wouldn't WD-40 or PBlaster be a good way to fix the problem. I know both are able to be used on electrical components so that would not be a issue and it should lube the part enuff to stop the squeek. I would never use WD40 as a permanent lubricant. If there's a pulley squeaking or stiffening, it needs to be replaced. My 94 LS400 I bought a month ago, just broke the drive belt. Feeling the pulleys, I found that the fan clutch brackt pulley had froze up solid. Didn't have any warning either. Find out which pulley is squealing before you break down and have to wait for parts. (I am a new member and this is my first reply, hope I didn't pull a fopah of any sort) Welcome to the LOC. Feel free to join in anytime. Quote Link to comment Share on other sites More sharing options...
Threadcutter Posted January 15, 2009 Share Posted January 15, 2009 wouldn't WD-40 or PBlaster be a good way to fix the problem. I know both are able to be used on electrical components so that would not be a issue and it should lube the part enuff to stop the squeek. I would never use WD40 as a permanent lubricant. If there's a pulley squeaking or stiffening, it needs to be replaced. My 94 LS400 I bought a month ago, just broke the drive belt. Feeling the pulleys, I found that the fan clutch brackt pulley had froze up solid. Didn't have any warning either. Find out which pulley is squealing before you break down and have to wait for parts. (I am a new member and this is my first reply, hope I didn't pull a fopah of any sort) jr; Nicely done! Welcome aboard! Remember, when soliciting advice, it is also your responsibility to reply back as to whether the suggestion worked or not. Most everyone else follows threads here and it is very helpful to everyone when the loop is closed. There seem to be a lot of newbies here lately and by and large, it appears they bring a lot of knowledge with them. Congrats! Quote Link to comment Share on other sites More sharing options...
steve2006 Posted January 15, 2009 Share Posted January 15, 2009 The same happens with my 94 LS squeals for 30 seconds or so in cold weather then nothing for the rest of the day. On mine it was the top idler to the right of the tensioner ( apparently a pig to replace due to the amount of stripping down) been like it 3 years now never got worse. Quote Link to comment Share on other sites More sharing options...
SKperformance Posted January 19, 2009 Share Posted January 19, 2009 If your battery is failling in the cold it is goign to cause the altenator to try hard torecharge it from being low on vlatage and hard to accept a charge. Quote Link to comment Share on other sites More sharing options...
lexfourcam Posted January 19, 2009 Share Posted January 19, 2009 ive always just put some 3 in 1 motor oil on my belt every once in a while i hear a bird chirpin it always fixes it, and it usually doesnt come back for another month or 2. Quote Link to comment Share on other sites More sharing options...
domin8r3 Posted February 4, 2009 Share Posted February 4, 2009 wouldn't WD-40 or PBlaster be a good way to fix the problem. I know both are able to be used on electrical components so that would not be a issue and it should lube the part enuff to stop the squeek. I would never use WD40 as a permanent lubricant. If there's a pulley squeaking or stiffening, it needs to be replaced. My 94 LS400 I bought a month ago, just broke the drive belt. Feeling the pulleys, I found that the fan clutch brackt pulley had froze up solid. Didn't have any warning either. Find out which pulley is squealing before you break down and have to wait for parts. (I am a new member and this is my first reply, hope I didn't pull a fopah of any sort) I own a 94 ls 400 , wife said it was knocking , checked all the pulleys , after checking the belt, & the pulley was not harmonic. It looks to be the bearings on the bearing bracket(I thought it was the water pump!), my mech. said the part is around $100, but the labor is quite a bit, because you have to disassemble the same components as you would if you are changing the timing belt, so you might as well replace timing belt if it's old. I'll elaborate on the job & the price in a cpl days , thanks ! Quote Link to comment Share on other sites More sharing options...
lenore Posted February 4, 2009 Share Posted February 4, 2009 Hi All,I have 1994 LS400 with about 159k miles and she runns great. The only problem I have now is that Serpentine Belt make noise only during startup or when cold. I changed the belt tensioner and Idler pulleys. Still the same. What else can cause this noise? Thanks. The belt is too loose. Also would highly recommend original equipment belt as some aftermarket belts dont sit in the grooves the same. You can test belt tightness by twisting it 90 degrees in the longest stretch, it should not make the 90 degrees bend, if it does it is too loose. Quote Link to comment Share on other sites More sharing options...
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