valve noise

nailhead432 · 04-06-2010, 11:10 PM

I've been expriencing a couple of differenet tapping / knocking noises. The loudest noise happens during start up but goes away when the oil pressure increases. The other noise sounds a little like a lifter tapping.
So, today I took the cam covers off and checked the clearances on my valves. All of the intake valves had .010 clearance except the furthest one back on 4 and 5. Both of them had .011 clearance. All of the exhaust valves were at .012 clearance. Would only 2 of the valves being out only .001 be enough to cause such a dramatic noise?

cre · 04-07-2010, 02:08 AM

The tapping, if very light may just be the injectors.. we've got loud injectors. The knocking sound may be due to a misfire or the early sign of impending rod knock.

DarkSupra2.5 · 04-07-2010, 03:48 PM

If you really get the knocking just at start up, you've more than likely a rod bearing about to go. My supra was doing this recently until i spun a bearing, and it sounded like it was coming from the top of the motor...such a sad time.

04-06-2010, 11:10 PM	#1
nailhead432 Stock Join Date: Feb 2010 Location: Alabama Posts: 7	valve noise I've been expriencing a couple of differenet tapping / knocking noises. The loudest noise happens during start up but goes away when the oil pressure increases. The other noise sounds a little like a lifter tapping. So, today I took the cam covers off and checked the clearances on my valves. All of the intake valves had .010 clearance except the furthest one back on 4 and 5. Both of them had .011 clearance. All of the exhaust valves were at .012 clearance. Would only 2 of the valves being out only .001 be enough to cause such a dramatic noise?

04-07-2010, 02:08 AM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	The tapping, if very light may just be the injectors.. we've got loud injectors. The knocking sound may be due to a misfire or the early sign of impending rod knock. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

04-07-2010, 03:48 PM	#3
DarkSupra2.5 3" Exhaust Join Date: May 2008 Location: Sacramento Posts: 60	If you really get the knocking just at start up, you've more than likely a rod bearing about to go. My supra was doing this recently until i spun a bearing, and it sounded like it was coming from the top of the motor...such a sad time. __________________ 1jz-gte swap (Currently spun #3 rod bearings), Apexi high flow filter, Greddy thrust 3" downpipe, N1 3" catback with cat delete tube, 1 peice driveshaft, Bar and Plate intercooler, and 440 JDM 2jz injectors. Possible 2jz lower block swap in the works if I can't rebuild the 1j. So troublesome.

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