Jake Posted April 7, 2006 Share Posted April 7, 2006 On a VVTi the intake cam gear rotates freely through about 20 degrees. So what's the drill for replacing the cam belt? Do I rotate the cam gear clockwise as far as it will go and line up the marks on the wheel and the back plate, with the wheel as far clockwise as it'll go? Or what? Thanks Quote Link to comment Share on other sites More sharing options...
Alex Posted April 7, 2006 Share Posted April 7, 2006 Is there no TDC marking on it? Quote Link to comment Share on other sites More sharing options...
Jake Posted April 7, 2006 Author Share Posted April 7, 2006 On what? The cam gear moves freely, I can make the alignment mark on it line up in like four different positions relative to the belt. Quote Link to comment Share on other sites More sharing options...
Alex Posted April 7, 2006 Share Posted April 7, 2006 Mig's done Terry's I'm sure he'll know Quote Link to comment Share on other sites More sharing options...
Digsy Posted April 7, 2006 Share Posted April 7, 2006 On what? The cam gear moves freely, I can make the alignment mark on it line up in like four different positions relative to the belt. That's odd. Not sure about the Supra one, but modern phasing cam pulleys are usually spring loaded into either the fully advanced or fully retarded position. I'm working with some of these at the moment. I'll check on monday. Quote Link to comment Share on other sites More sharing options...
Jake Posted April 7, 2006 Author Share Posted April 7, 2006 Thanks Darren, let me know. Where's Mig when I need him? Quote Link to comment Share on other sites More sharing options...
Digsy Posted April 10, 2006 Share Posted April 10, 2006 OK, on the parts I am dealing with there are both sprung and non-sprung designs. However, on both designs there is a locking pin which detents the pulley at one end of its travel in the absence of any oil pressure. I can't say whether the SUpra VVTi pulley will have a similar feature, but for mass production assembly it would be bonkers not to have some kind of locking system to make timing the cam drive foolproof (as Jake is finding out!). Does it look like there is provision for a pin or special tool to be inserted externally to lock the pulley? Quote Link to comment Share on other sites More sharing options...
Jake Posted April 10, 2006 Author Share Posted April 10, 2006 Does it look like there is provision for a pin or special tool to be inserted externally to lock the pulley?There is a mystery hole in the front of the cam gear cover. That must be it. I'll go play about with it. Thanks muchly Quote Link to comment Share on other sites More sharing options...
V Posted April 10, 2006 Share Posted April 10, 2006 small hi-jack. Is the Cam belt the same for all TT? (UK/JAP/VVTi) Many thanks Quote Link to comment Share on other sites More sharing options...
Jake Posted April 10, 2006 Author Share Posted April 10, 2006 yes Quote Link to comment Share on other sites More sharing options...
V Posted April 10, 2006 Share Posted April 10, 2006 thank you Quote Link to comment Share on other sites More sharing options...
Digsy Posted April 10, 2006 Share Posted April 10, 2006 Did it work, Jake? Quote Link to comment Share on other sites More sharing options...
Jake Posted April 11, 2006 Author Share Posted April 11, 2006 Did it work, Jake?No I'm gonna PM Mig and Terry and see if they can answer my question. Quote Link to comment Share on other sites More sharing options...
jot_ie Posted April 11, 2006 Share Posted April 11, 2006 Jake I would appreciate it if you could let me know how this turns out I will be replacing the fan and timing belt over the next few weeks on my 98 supra, along with installing an Unorthodox racing cam gear (exhaust only as its a vvti). I was thinking of doing it myself but now getting worried. I have searched the web, when I saw your post but could find nothing. Very best of luck with it John Quote Link to comment Share on other sites More sharing options...
Jake Posted April 11, 2006 Author Share Posted April 11, 2006 Will do John. If I had known about this issue I would have marked the postition of the cam gear in relation to the camshaft before undoing any of it - then I would know for sure. I wish you were doing it tomorrow John, you could tell me the answer then! Quote Link to comment Share on other sites More sharing options...
jot_ie Posted April 12, 2006 Share Posted April 12, 2006 Will do John. If I had known about this issue I would have marked the postition of the cam gear in relation to the camshaft before undoing any of it - then I would know for sure. I wish you were doing it tomorrow John, you could tell me the answer then! Thanks mate Until now I think I would have quiet happily jumped straigh in, unaware of the pitfalls. If I was doing it tomorrow I would gladly help you out. I have a few weeks before it will be done. Waiting on parts. But I will keep searching the web. If I come up with anything I will let you know. Been thinking as well. Maybe a haynes manual for some of the newer toyotas that have vvti....might be something in them on changing a timing belt just a thought John Quote Link to comment Share on other sites More sharing options...
Jake Posted April 13, 2006 Author Share Posted April 13, 2006 On a VVTi the intake cam gear rotates freely through about 20 degrees. So what's the drill for replacing the cam belt? Do I rotate the cam gear clockwise as far as it will go and line up the marks on the wheel and the back plate, with the wheel as far clockwise as it'll go? Or what? BUMP (Hoping for a reply from Mig or CW, or anyone that knows) Quote Link to comment Share on other sites More sharing options...
spartan Posted March 30, 2008 Share Posted March 30, 2008 Did you ever get a definitive response/answer on this? Thanks Quote Link to comment Share on other sites More sharing options...
JODY T Posted February 21, 2009 Share Posted February 21, 2009 Im doing this now, does anyone have the answer... I didnt get that involved with the inner workings of the VVTI, when i was working with supras, This is the only thing im a little unsure about, and cant afford to shag the engine lol Quote Link to comment Share on other sites More sharing options...
Steve Sherwood Posted February 22, 2009 Share Posted February 22, 2009 (edited) It has a TDC mark and the pully has a peg to locate it on the cam, there may be two marks so I would set it on TDC before you remove the pull. Just set it on TDC as usual remove center cap screw not ring of bolts. You need to clear oil from pully insructions inside spark plug cover. Edited February 22, 2009 by Steve Sherwood (see edit history) Quote Link to comment Share on other sites More sharing options...
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