d_d Posted May 4, 2008 Share Posted May 4, 2008 Hi guys Just putting my cams back into the car after having the head skimmed and valves re-seated. Now im checking the clearances and they seem to be out. Ive got cj's manuals but im not really sure on them and dont understand tbh Am i right in saying that when the lobe faces upwards under each valve this measurement is the one im looking at within the tolerances and adjust accordingly? I did time it all back up and measured the different points like it said in the manual but some of the lobes were pushing against the valve which confused me even more. If someone could explain to me where im going wrong, or a nice guide on it would be good Its got me thinking that maybe the cams could be swappped if possible? Its a j-spec tt and i can see the No1 imprinted on it and No2 No1 being the inlet? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted May 5, 2008 Share Posted May 5, 2008 The clearances are all checked with the lobe of each valve away from the tappet bucket, so a lot of turning is needed. the inlet cam has "pegs" on it that trigger the 2 cam position sensors, the exhaust one doesn't. Quote Link to comment Share on other sites More sharing options...
AndyT Posted May 5, 2008 Share Posted May 5, 2008 Don't get this wrong bud. If you have doubts ask, or get a professional. Quote Link to comment Share on other sites More sharing options...
RobSheffield Posted May 5, 2008 Share Posted May 5, 2008 Don't get this wrong bud. If you have doubts ask, or get a professional. Quote Link to comment Share on other sites More sharing options...
TLicense Posted May 5, 2008 Share Posted May 5, 2008 Hi guys Just putting my cams back into the car after having the head skimmed and valves re-seated. Now im checking the clearances and they seem to be out. Ive got cj's manuals but im not really sure on them and dont understand tbh Am i right in saying that when the lobe faces upwards under each valve this measurement is the one im looking at within the tolerances and adjust accordingly? I did time it all back up and measured the different points like it said in the manual but some of the lobes were pushing against the valve which confused me even more. If someone could explain to me where im going wrong, or a nice guide on it would be good Its got me thinking that maybe the cams could be swappped if possible? Its a j-spec tt and i can see the No1 imprinted on it and No2 No1 being the inlet? They won't fit the wrong way around. I can't remember what it is that stops them fitting, but I remember when I was faffing around with the head on mine during my engine strip down, when I went to sit the cams back into it just to keep them out of the way. I went to put the cam I had in my hands into the exhaust side and it wouldn't fit. I then started to pay attention and realised I had the inlet cam in my hands. (had the position triggers on it). Quote Link to comment Share on other sites More sharing options...
d_d Posted May 5, 2008 Author Share Posted May 5, 2008 Yea i noticed this morning that i must of had them in the correct position by the sensors. Im gonna get my dad to measure them up as he works in this very fine measurement on a daily basis. If for example the gap is to small and needs to be wider. Is it possible that an engineer could use a surface grinder. Or is it not really worth the hassle? How much are they from Toyota? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted May 6, 2008 Share Posted May 6, 2008 I grind all my own shims, a surface grinder is fine, but grind the side that sits on the bucket, not the side the lobe rubs against, leave that side alone, and with its parent lobe. Quote Link to comment Share on other sites More sharing options...
d_d Posted May 6, 2008 Author Share Posted May 6, 2008 thanx chris youve made me feel more confident about it now. Ill hopefully be looking into this the weekend so if im unsure ill be asking but having a measure on a few it looks to me like they need grinding down rather then making them smaller Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted May 6, 2008 Share Posted May 6, 2008 If the valves have had their seats re-cut the clearances will have closed up, needing thinner shims, hence you can grind the existing ones. Quote Link to comment Share on other sites More sharing options...
SimonB Posted May 7, 2008 Share Posted May 7, 2008 They won't fit the wrong way around. I can't remember what it is that stops them fitting It's the no.1 journal (the one at the front) on the cam - it's wider on the exhaust cam so you can put the intake cam in the exhaust side accidently but not the other way round. I remember doing that when I changed cams once! Quote Link to comment Share on other sites More sharing options...
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