cheekymonkey Posted October 23, 2007 Share Posted October 23, 2007 Hi Guys and Gals Not relating to my Supra's engine but I am sure the principles are the same. My brother and I are rebuilding an EVO 4 engine and trying to do as much of the work ourselves as we can. One of these tasks is to lap the valves so they sit nice and snug but have never done anything like that before. I'm not sure about how much pressure should be applied using the wooden stick thing, or how long to grind for, how long does it take for each valve? Please pipe up if you have any engine rebuild tips for us as well James Quote Link to comment Share on other sites More sharing options...
Missile Posted October 24, 2007 Share Posted October 24, 2007 Is the little stick the one with the sucker pad on the end ? Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted October 24, 2007 Share Posted October 24, 2007 You shouldn't need to apply pressure the weight of the valve and the paste should do the job,lift and re-seat the valve frequently to redistribute the paste, as for how long, well its a case of looking at the seat, you should aim for a seat area of about 2mm if you still have any pock marks the valve or seat should have been re-cut/reground, clean everything well afterwards, and don't get any paste on the stems. Quote Link to comment Share on other sites More sharing options...
snake Posted October 24, 2007 Share Posted October 24, 2007 check that there is not loads of play in the valve guides first. you should have medium then fine lapping paste and follow instructions above. it should not take that long to lap in . Quote Link to comment Share on other sites More sharing options...
cheekymonkey Posted October 25, 2007 Author Share Posted October 25, 2007 Cheers guys I appreciate the advice Quote Link to comment Share on other sites More sharing options...
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