herbiemercman Posted April 2, 2016 Share Posted April 2, 2016 (edited) Hi Guys, Iv'e got the dreaded loud tapping noise coming from the rocker cover where the twin cam shafts live. The noise only comes on after a hard fast run with oil temp at 95C, when the oil cools down to say 50C the noise stops ? I do not think this is a little end on one of the con-rods, as it is a light tapping, and not a distinct knock. The engine runs quietly and very smoothly and performance is great, just confused me how the oil temp is playing a part? I assume this engine has the bucket & shim adjustment for the valve stem clearances ? and not the hydraulic valve pusher type ? Also i assume my engine will not have the VVTI system fitted?, i know this can cause tapping noise? So if my noise is a tappet clearance issue as described above, then is it some thing i can ignore for a while? my engine has 44k miles on from new, i know as i bought the car new, the engine has covered circa 600 hard miles since it had the NA/T conversion, it has fully syth qual oil and an oil cooler. Any advise from your experience will be much appreciated. Herbie. Edited April 2, 2016 by herbiemercman added extra text. (see edit history) Quote Link to comment Share on other sites More sharing options...
j_jza80 Posted April 2, 2016 Share Posted April 2, 2016 Your car definitely doesn't have vvti, the only NA's with it were the final production year US spec NA Supras. Quote Link to comment Share on other sites More sharing options...
herbiemercman Posted April 2, 2016 Author Share Posted April 2, 2016 Some one out there must know about 2JZ-GE tappet specs, but i have found after much research, that yes they are "bucket and shim" set ups, BUT they could have hydraulic lifters? If this is the case then my tappet noise problem is solved as these things are oil temp related to noise problems, as you can see from my opening thread my noise is bad when my oil is hot after a high speed blast, then when it cools the noise is gone, typical hydraulic lifters. Help please. Quote Link to comment Share on other sites More sharing options...
David P Posted April 2, 2016 Share Posted April 2, 2016 Top tip. When doing research, open your eyes. Quote Link to comment Share on other sites More sharing options...
herbiemercman Posted April 2, 2016 Author Share Posted April 2, 2016 Hi David, I did have my eyes wide open but could not find the answers, do you have them, it would be appreciated. Herbie. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 3, 2016 Share Posted April 3, 2016 GE, GTE and the VVTi variants all have shim adjustable valve clearances, not hydraulic. I can say that clearly, even after the wife's party, at 2.30 AM What a good boy am I! Quote Link to comment Share on other sites More sharing options...
Ian C Posted April 3, 2016 Share Posted April 3, 2016 Turn the radio up Without a recording of the noise it's impossible to say, really. Quote Link to comment Share on other sites More sharing options...
herbiemercman Posted April 4, 2016 Author Share Posted April 4, 2016 Hi Ian, I don't put the radio on as i like listening to the exhaust note, lol, but to be serious i would value your opinion on "why do i get the tappet noise when the engine is hot and then goes off when the engine cools down" ? ? According to Chris there are no hydraulic lifters, just mechanical bucket and shim, so where is the hot oil causing the noise to come from ? For all the 19 years i have had the car i have used part synth oil, but due to the NA/T conversion and the turbo heating up the oil, i put fully synth oil in, that was 500 miles ago, so why would this produce some noisy excessive play in a moving part ? ? If you have what-app i could send you a sample of the noise if you are prepared to help me. Herbie. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 4, 2016 Share Posted April 4, 2016 Sure it's tappet noise As the oil gets hotter it gets thinner, it might cause an overly widely set tappet clearance to become noisier, it could also be piston noise, or something else. Have you listened with a long screwdriver to see if you can pinpoint where it's coming from? Quote Link to comment Share on other sites More sharing options...
herbiemercman Posted April 5, 2016 Author Share Posted April 5, 2016 Hi Chris, Thanks for that, i will put the screwdriver on as you suggest, i hope it is a tappet, however if it is a little end or a piston i assume, and hope this could be changed with the engine remaining in the car? all be it i do not know how one would check which of the six cylinders had the faulty part ? Herbie. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 5, 2016 Share Posted April 5, 2016 Hopefully it's not a piston as that would be a full engine strip and rebuild, and you might as well then rebore and fit proper lower compression forged pistons to it. Quote Link to comment Share on other sites More sharing options...
herbiemercman Posted April 6, 2016 Author Share Posted April 6, 2016 Hi Chris, Thanks for your help, looks like it is a tappet, on start up the engine was quiet recently and following a fairly quick drive, not hammering it, oil 90C, returned and no noise at all, when i really hammer it and oil at 105C, then the light tapping comes on from the rear of the rocker cover. I am going to leave it and keep a watching brief as i know what it is now and why it is ocuring and the loss of power from a valve not fully opening must be minimal. Herbie. Quote Link to comment Share on other sites More sharing options...
bignum Posted April 6, 2016 Share Posted April 6, 2016 Did you fit a cooler in the end? Quote Link to comment Share on other sites More sharing options...
herbiemercman Posted April 12, 2016 Author Share Posted April 12, 2016 (edited) Hi Bignum, Yes i fitted the oil cooler a thermostatic one as i know too cold oil is as bad as too hot oil, i never exceed 105C now and for most of my driving it stays at 90C, which is what the thermostat is set at. I am glad i had the good quality oil temp gauge fitted, as without this i would have been cooking my oil, i was getting as high as 135C, i think you and other members told me the oil cooler was a no brainer if you cared about your engine. Herbie. SUP.BEST.PIC.NAT..jpg (203.2 KB) 20151127_143309.jpg (179.6 KB) OIL COOLER..jpg (183.7 KB) Edited April 12, 2016 by herbiemercman ADDED PHOTO. (see edit history) Quote Link to comment Share on other sites More sharing options...
herbiemercman Posted April 12, 2016 Author Share Posted April 12, 2016 Hi Bignum, Yes i fitted the oil cooler a thermostatic one as i know too cold oil is as bad as too hot oil, i never exceed 105C now and for most of my driving it stays at 90C, which is what the thermostat is set at. I am glad i had the good quality oil temp gauge fitted, as without this i would have been cooking my oil, i was getting as high as 135C, i think you and other members told me the oil cooler was a no brainer if you cared about your engine. Herbie. SUP.BEST.PIC.NAT..jpg (203.2 KB) 20151127_143309.jpg (179.6 KB) Quote Link to comment Share on other sites More sharing options...
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