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Car Forum / Honda Cars / March 2006Valve lash question
Was adjusting valve lash on my '97 Odysey and did a double-take when I realized that the order was 1, 3, 4, 2. It made me wonder if I did the order correctly on my daughter's '93 Accord a few weeks ago. I recall I had to start over part way through the adjustment for some reason, but it was a few weeks ago and I forget whether it was because I realized I was trying to do the order incorrectly. The engine runs smoothly. No valve clatter. Would the engine run poorly or sound odd in some way that would tell me whether I inadvertantly adjusted the valves based on 1,2,3,4? Yes, worst case I can pull the cover again and check.... thx, KWW On 3/2/06 9:46 AM, in article srENf.2$Gd.0@dfw-service2.ext.ray.com, "KWW" <kwalker@nospamaircooled.net> wrote: > Was adjusting valve lash on my '97 Odysey and did a double-take when I > realized that the order was 1, 3, 4, 2. It made me wonder if I did the [quoted text clipped - 10 lines] > thx, > KWW As long as the appropriate cam lobe was in the right position when you did each valve, it doesn't matter. I shouldnt matter, the piston has to be at TDC anyways to make the adjustment. 1,3,4,2 is the firing order, it makes sense to do it this way because it's less work spent turning the crankshaft, but it's not absolutley necessary.  Signaturebluevp00 http://www.automotiveforums.com "... less work spent turning the crankshaft..." well, if the crank was just turned 180 degrees each time (camshaft 90 degrees) but the order of adjustment was 1, 2, 3, 4, then it would not be correct by the cam lobes... but wouldn't it run oddly? I may have started over and fixed it... as I said, I recall doing something over again, but I just cannot recall if it was the valve adjustments. SignatureKWW > I shouldnt matter, the piston has to be at TDC anyways to make the > adjustment. 1,3,4,2 is the firing order, it makes sense to do it this > way because it's less work spent turning the crankshaft, but it's not > absolutley necessary. > "... less work spent turning the crankshaft..." well, if > the crank was just turned 180 degrees each time (camshaft > 90 degrees) but the order of adjustment was 1, 2, 3, 4, > then it would not be correct by the cam lobes... Right, I don't think this will do. Doing #1 with its piston at TDC, end of compression, then rotating 180 degrees, then doing #2 would put #2 piston at its top, but not for the compression stroke (where exhaust and intake valves should be shut). Instead, it would be at the end of its exhaust stroke (exhaust valves just about shut, intake valves starting to open). I would think the lash is off and quite possibly by too much. If its on the low side, you risk IIRC "burning" a valve, and you won't necessarily hear that damage occuring until its too late. If the lash is on the high side (clearance too large), you might hear tapping when the engine is cold. Unless someone injects some more wisdom, I'd get under that valve cover and re-do the job. > but wouldn't it run oddly? I may have started over and > fixed it... as I said, I recall doing something over > again, but I just cannot recall if it was the valve > adjustments. > "... less work spent turning the crankshaft..." well, if the crank was > just turned 180 degrees each time (camshaft 90 degrees) but the order > of adjustment was 1, 2, 3, 4, then it would not be correct by the cam > lobes... but wouldn't it run oddly? I may have started over and fixed > it... as I said, I recall doing something over again, but I just > cannot recall if it was the valve adjustments. All you need to do is make sure all the lobes you want to adjust are pointing up to the sky. Adjust that cylinder's set, then turn the crank again until the next set are pointing skywards. Easy. It's all I do on my DOHC engine. SignatureTeGGeR® The Unofficial Honda/Acura FAQ www.tegger.com/hondafaq/ |
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