98sub2500leg Posted June 10, 2009 Share Posted June 10, 2009 98 EJ25, DOHC Before I removed my TB, I had spent plenty of time making sure everything was lined up(TB marks, cam sprocket-sprocket marks, sprocket-rear cover marks, sprocket arrows). The Left intake and exhaust double marks were off by approx 1/4 of one timing tooth. In other words, they didn't quite line up perfectly, but all other marks did. It does re-align to the same positions and all TB teeth references count out perfectly. It seems though after pondering, that maybe the lifters need to be re-shimmed on one side. This to me seems to be the only way it can be off. I didn't measure the clearance with the plasti gauges before re-installing the cams as the engine ran great before disassembly. I believe those double ticks should line up perfectly at upper 6:00 and lower 12:00 and they don't (close but not perfect). Just would like to know before dropping the engine back in. just getting done with HG job. Link to comment Share on other sites More sharing options...
mdjdc Posted June 10, 2009 Share Posted June 10, 2009 If it ran fine before you disassembled it, then leave well enough alone. I have done several and sometimes the marks are just a touch off, but the car runs great. Not sure why they are off, but I don't mess with a known entity. Replacing those shims can be very expensive and won't change the alignment of the marks. That is a product of the teeth on the belt and the cam gears, not the lifters. Good luck Link to comment Share on other sites More sharing options...
OB99W Posted June 10, 2009 Share Posted June 10, 2009 98 EJ25, DOHC Before I removed my TB, I had spent plenty of time making sure everything was lined up(TB marks, cam sprocket-sprocket marks, sprocket-rear cover marks, sprocket arrows). The Left intake and exhaust double marks were off by approx 1/4 of one timing tooth. In other words, they didn't quite line up perfectly, but all other marks did. It does re-align to the same positions and all TB teeth references count out perfectly. It's fine the way it is. Those double marks are not that critical. See the next-to-the-last paragraph in http://www.motor.com/magazine/pdfs/102001_08.pdf (and ignore the flipped-over photo ). While it's obviously best if the alignment is perfect, even if there was a misalignment of the more-critical single marks by 1/4 tooth, that would only be about 3-4 degrees off, or 1%. Link to comment Share on other sites More sharing options...
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