Patters Posted December 25, 2002 Share Posted December 25, 2002 Hi, Merry Christmas to all........... I've got a strange noise coming from the top of the engine block. I noticed it a couple of months ago, but it seems to slowly getting worse. Its a knocking sound between 2500-3000ish rpm then through 5000+ rpm. It sounds as though theres not enough oil getting to the top of the engine. Could it be the bearings on the cams? Is it a big job? Thanks in advance. Patters Quote Link to comment Share on other sites More sharing options...
Supra Pilot Posted December 25, 2002 Share Posted December 25, 2002 Very difficult to trouble shoot a noise without actually hearing it. My advise to you, would be to get to the nearest Toyota or a decent garage as soon as possible.....Let someone in the trade experience it first hand, and hopefully you are not too late if there is something wrong with regard to lubrication of the engine! Also being an Na car(fairly simple straight foward type motor), any mechanic worth his salt should be able to diagnose your problem! Good Luck m8.. Quote Link to comment Share on other sites More sharing options...
Syed Shah Posted December 26, 2002 Share Posted December 26, 2002 What fuel do you use? Quote Link to comment Share on other sites More sharing options...
Patters Posted December 26, 2002 Author Share Posted December 26, 2002 I've used Shell Optimax for a good year now. I've discovered the problem, it is one of the bearings in the cams. I can hear it every couple of seconds, when the engine is at idle. Could it be a DIY job? or is it too dangerous to start messing with? Anyone had this problem before? Patters Quote Link to comment Share on other sites More sharing options...
Andrew Dunk Shaw Posted December 26, 2002 Share Posted December 26, 2002 Originally posted by Patters I've used Shell Optimax for a good year now. I've discovered the problem, it is one of the bearings in the cams. I can hear it every couple of seconds, when the engine is at idle. Could it be a DIY job? or is it too dangerous to start messing with? Anyone had this problem before? Patters Not really a DIY job unless your a decent spanner man. Quote Link to comment Share on other sites More sharing options...
Supra Pilot Posted December 26, 2002 Share Posted December 26, 2002 Bearings in the cam????? Quote Link to comment Share on other sites More sharing options...
Adam W Posted December 26, 2002 Share Posted December 26, 2002 Does the MkIV head have removable (replaceable) bearing shells for the cam? Quote Link to comment Share on other sites More sharing options...
Supra Pilot Posted December 26, 2002 Share Posted December 26, 2002 Originally posted by Adam Wootten Does the MkIV head have removable (replaceable) bearing shells for the cam? Exactly! Plus IF it does, and it's worn etc, I'm sure it won't make a knocking sound! Anyone even attempting to trouble shoot this for you over the internet will be taking a guess! No internal engine 'knocking' is good for the engine. M8, you asked for advise, Go get the car checked by someone in the know asap! Quote Link to comment Share on other sites More sharing options...
Patters Posted December 26, 2002 Author Share Posted December 26, 2002 Thanks for your views, its going straight into my local garage when its open again. I'm hoping its a straight forward job, otherwise the bank manager is going to be after me! Thanks again, Patters Quote Link to comment Share on other sites More sharing options...
Bobbeh Posted December 26, 2002 Share Posted December 26, 2002 I've noticed a ticking sorta noise too. Might be oil as I havent put any in since it was last serviced. Its due for one soon anyway. Sounds like something I had with my old Corolla. If you get it identified please let us know just in case its the same thing. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted December 26, 2002 Share Posted December 26, 2002 Originally posted by Supra Pilot Exactly! Plus IF it does, and it's worn etc, I'm sure it won't make a knocking sound! Anyone even attempting to trouble shoot this for you over the internet will be taking a guess! No internal engine 'knocking' is good for the engine. M8, you asked for advise, Go get the car checked by someone in the know asap! Cams run direct in head, no shells. It's most unlikely to be that, more likely to be a loose spark plug, or blow on the head to exhaust manifold gaskets. Quote Link to comment Share on other sites More sharing options...
Patters Posted December 27, 2002 Author Share Posted December 27, 2002 Hmmm...... thats interesting, the noise is definately coming from the right side cam. Revving the car upto 3000rpm, the noise is like a knocking definately from the cam, then dropping down to idle the noise is a intermittent kinda crunching noise. Like there is a cracked bearing. I've had my ear right by it. Chris is there anything else you think it could be? I just want to have a basic idea of what it could be, so the garage can't blag me.......... it being just after Christmas and that! Cheers Patters Quote Link to comment Share on other sites More sharing options...
Terminator Posted December 27, 2002 Share Posted December 27, 2002 What about a damaged lobe? It is not a long job to get the covers off, it may be worth a quick visual check. Quote Link to comment Share on other sites More sharing options...
Patters Posted December 27, 2002 Author Share Posted December 27, 2002 Also before I forget, having the cam cover off while running the engine, I noticed that the right handside cam ( The one which the noise is coming from), looks like its buckled, its not running straight, like the cam on the left handside, if you know what I mean. Thats why I thought it could be a bearing or something. Patters Quote Link to comment Share on other sites More sharing options...
Patters Posted December 27, 2002 Author Share Posted December 27, 2002 Yep, already done, I've had the rocker box covers off. No visual damage. Hmmm...... how confusing Patters Quote Link to comment Share on other sites More sharing options...
Supra Pilot Posted December 27, 2002 Share Posted December 27, 2002 Originally posted by Patters Also before I forget, having the cam cover off while running the engine, I noticed that the right handside cam ( The one which the noise is coming from), looks like its buckled, its not running straight, like the cam on the left handside, if you know what I mean. Thats why I thought it could be a bearing or something. Patters Haven't seen a 'cam' buckled before! If it's buckled you will know.....The car won't work correctly, idling, everything will be a problem! As I said BEFORE, there is no bearings(well replacable shells) for the cams to run in.....and EVEN if they had bearing caps etc, it would not KNOCK, it's a rotating motion plus the cam is well supported along it's body!!!!!! If you believe it's really from the top(valve train area) then only possible things can be valve(s) not getting lubed or rockers worn or lack of oil etc..... But generally these problems in this area will give a more tapping type sound. A knocking noise from the bottom end will be transmitted up and sound like something near the top to the(average) untrained ear! Thats my 2pence AGAIN. Good Luck Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted December 27, 2002 Share Posted December 27, 2002 Originally posted by Patters Hmmm...... thats interesting, the noise is definately coming from the right side cam. Revving the car upto 3000rpm, the noise is like a knocking definately from the cam, then dropping down to idle the noise is a intermittent kinda crunching noise. Like there is a cracked bearing. I've had my ear right by it. Chris is there anything else you think it could be? I just want to have a basic idea of what it could be, so the garage can't blag me.......... it being just after Christmas and that! Cheers Patters I have seen cams snap, but keep on turning as the jagged break is held together by thrust against the sides of the bearing housings, it usually occurs because oil feed to the bearings has stopped at some time. See if you can rotate the back of the cam a tiny bit, independently of the front, if it HAS snapped do not run it again, and have them find out WHY it has snapped too, and check all bearings for wear , scoring or partial seizure. Expect serious bills :-( Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.