Nicko Posted August 19, 2012 Share Posted August 19, 2012 1994 JAZ80 non turbo - Jap import hey fellas, Was hoping to get a little insight into a new problem I have with with my supra. Something has broken in the head of the engine, It started off with a little tap that I didn't think much of and now a couple of days ago it suddenly developed into a really loud clapping sound. I think one of the exhaust valves has broken as the sound is coming from that area. I've had the rocker covers off and inspected the cams, they seem ok no damage to the lobes. Also what I can see of the cam followers underneath all seems in order. The engine runs and starts fine, its on all 6 cylinders and apart from the clapping sound it runs smooth no vibrations, so I'm not suspecting failure of heavier bottom end components.(Not yet) The only work done on the car recently was new spark plugs, which ran great until it went bust. Next thing to do is strip the head off and look at the valves and piston faces. I thought I'd upload the video I took today to get some insight as I'm sure you fellas have come across this before.! Any help or suggestions are appreciated guys. -Nicko [video=youtube;p2hfx-2Bo1U]http://www.youtube.com/watch?v=p2hfx-2Bo1U&feature=youtu.be Link to comment Share on other sites More sharing options...
welshbuddy Posted August 19, 2012 Share Posted August 19, 2012 the air filter, why is it so close to the engine??? its absorbing alot of heat!. wire tuck knocking i dont know, Link to comment Share on other sites More sharing options...
Nicko Posted August 19, 2012 Author Share Posted August 19, 2012 The cone was just put on to test the engine, it normally goes right down into the front, and the wires are all over the shop as i've just quickly put everything together. The issue is the knocking! Link to comment Share on other sites More sharing options...
Kirk Posted August 19, 2012 Share Posted August 19, 2012 Have you tried to run it with the cam covers off? What may not be blatantly obvious when the engine isn't running may become very clear whilst it is. Link to comment Share on other sites More sharing options...
Nicko Posted August 19, 2012 Author Share Posted August 19, 2012 Have you tried to run it with the cam covers off? What may not be blatantly obvious when the engine isn't running may become very clear whilst it is. Yeah I did, still makes the same knocking noise, nothing seem out of the ordinary. Link to comment Share on other sites More sharing options...
Kirk Posted August 19, 2012 Share Posted August 19, 2012 I wasn't implying the covers being off were going to make the noise go away, I was thinking if its top end like you say then you'd be able to isolate it. You're sure its top end and internal for definite? Link to comment Share on other sites More sharing options...
Nicko Posted August 19, 2012 Author Share Posted August 19, 2012 Part of me thinks the tapping is a bit too fast for it to be a valve, what external parts could tap like this? Link to comment Share on other sites More sharing options...
-Welsh-Stealth- Posted August 19, 2012 Share Posted August 19, 2012 Ouch! Tried compression testing each cylinder? If it is a fubar valve at least it'll show you where to start looking. If not possibly bottom end bearings? Has it been run dry? And on the upside, NA engines don't cost alot Link to comment Share on other sites More sharing options...
Nicko Posted August 19, 2012 Author Share Posted August 19, 2012 Yep, bottom end bearing it is. Listen, then listen to mine at the top. Identical. Link to comment Share on other sites More sharing options...
keron Posted August 20, 2012 Share Posted August 20, 2012 defo sounds like bottom end knock... had a couple in like this mate... u sure it was not ran low on oil? Link to comment Share on other sites More sharing options...
Nicko Posted August 20, 2012 Author Share Posted August 20, 2012 Yeah it ran on 5 litres for a short while without realizing. Considering fixing it myself, does anyone know if the engine has to be raised a little to get the oil pan out? Link to comment Share on other sites More sharing options...
Kirk Posted August 20, 2012 Share Posted August 20, 2012 (edited) Engine out job or subframe off. It would be easier to just get a replacement lump, probably cheaper as well. Edited August 20, 2012 by Kirk (see edit history) Link to comment Share on other sites More sharing options...
Guest ugp Posted August 20, 2012 Share Posted August 20, 2012 You can pick up complete blocks for less than £100, I wouldn't faff about repairing yours, just drop another in. Link to comment Share on other sites More sharing options...
Nicko Posted August 20, 2012 Author Share Posted August 20, 2012 Cheers fellas.! Link to comment Share on other sites More sharing options...
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