3000gt timing question

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3000gt timing question - 8/6/2008 9:04:27 PM    4g63talon   Posts: 3 Joined: 8/6/2008 Status: offline I just timed my 96 3000gt sl and for some reason the valves and piston hit.  All of the timing marks are lined up, maybe half a tooth off on one of them. My question is, is there a possible head problem if the valves and piston meet when properly timed? Post #: 1

RE: 3000gt timing question - 8/7/2008 5:24:49 PM    dsm1990gsx Posts: 2954 Joined: 10/22/2007 Status: offline Did the car run prior to the timing belt change? _____________________________ 2003 Ford Escape old ladys car 1990 Tsi Awd daily driver 2007 Jeep Wrangler power wheels daughters car...soon to be converted from 12v to 24v (in reply to 4g63talon) Post #: 2

RE: 3000gt timing question - 8/7/2008 6:49:04 PM    4g63talon   Posts: 3 Joined: 8/6/2008 Status: offline Yes, I bought it off of someone who was driving it prior to me buying it. The timing belt jumped and bent all the intake valves on both heads, so I bought a used pair of heads online from a guy that said the heads were from a 1995 3000gt/stealth.  The heads are in good condition, valves are not bent at all.  I just re-timed the motor again and the valves are hitting the pistons still.  What would cause the valves to hit the pistons if the timing marks are all perfect? (in reply to dsm1990gsx) Post #: 3

RE: 3000gt timing question - 8/7/2008 6:53:42 PM    dsm1990gsx Posts: 2954 Joined: 10/22/2007 Status: offline How did you check if the valves weren''t bent w/ the used heads u got?  Can you post pics of the timing marks? _____________________________ 2003 Ford Escape old ladys car 1990 Tsi Awd daily driver 2007 Jeep Wrangler power wheels daughters car...soon to be converted from 12v to 24v (in reply to 4g63talon) Post #: 4

RE: 3000gt timing question - 8/9/2008 1:47:29 PM    4g63talon   Posts: 3 Joined: 8/6/2008 Status: offline I used gas to check for leaks in the valves, they were all fine. Any idea''s why the valves would hit the pistons when the timing marks are all lined up? (in reply to dsm1990gsx) Post #: 5

RE: 3000gt timing question - 8/9/2008 6:40:56 PM    dsm1990gsx Posts: 2954 Joined: 10/22/2007 Status: offline Can you post pics of the timing marks and the only thing i can think of that would cause that would be bent valves or something broke in the bottom end.  Are you sure its making contact b/c when you crank an engine by hand it''ll get hard in some spots b/c of the compression stoke (if that makes any sense to you). _____________________________ 2003 Ford Escape old ladys car 1990 Tsi Awd daily driver 2007 Jeep Wrangler power wheels daughters car...soon to be converted from 12v to 24v (in reply to 4g63talon) Post #: 6

RE: 3000gt timing question - 8/10/2008 9:36:54 AM    Joel_CA   Posts: 472 Joined: 9/20/2005 Status: offline         Are you assuming the valves and pistons are hitting because of a loud click?   It may just be your lifters ticking- some of which can completely collapse causing a very loud upperend tapping noise. JJ _____________________________ 1992 3000GT VR4 & 1996 STEALTH RT/TT #47 *both tastefully modded* (in reply to dsm1990gsx) Post #: 7

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