Scoobywagon Posted August 25, 2005 Share Posted August 25, 2005 Well, I went looking and couldn't find something definitive that says "This is how you find TDC on an EA81". So, barring that, I figure i'll set the crank to 0 as indicated by the timing marks on the flywheel. Then, I'll install the disty with the rotor pointed at #1. Then I'll try it. If it fires, great, if not, then one complete revolution at the crank pulley should do it, right? Any thoughts? Quote Link to comment Share on other sites More sharing options...
NorthWet Posted August 25, 2005 Share Posted August 25, 2005 Well, if you want to disturb the oil sealing on your valve cover, it is easy. Pull off the valve cover on the 1-3 side, crank the engine over to the "0" mark, and see if the rockers on the 1-3 cylinder are loose or depressing the valves. If they are loose, then you have TDC on the compression stroke for cylinder#1. Quote Link to comment Share on other sites More sharing options...
Scoobywagon Posted August 25, 2005 Author Share Posted August 25, 2005 Yeah...um...about that. See, I was trying to do this without opening the engine at all...so there! Concordantly! Ergo! Vis a Vis! Sorry...was just watching the Matrix Reloaded special features DVD...funny stuff. good times! Quote Link to comment Share on other sites More sharing options...
ShawnW Posted August 25, 2005 Share Posted August 25, 2005 Compression tester into #1. Turn engine by hand until compression rises and then watch the flywheel for the 0 mark. Quote Link to comment Share on other sites More sharing options...
NorthWet Posted August 25, 2005 Share Posted August 25, 2005 Compression tester into #1. Turn engine by hand until compression rises and then watch the flywheel for the 0 mark. You can also use a digital compression tester, if you didn't want to take your fancy HF system out of its case. :-p You can use your finger, or a loved-ones finger, on the spark plug hole and turn the engine until you feel the pressure. I guess you will go with ShawnW's excellent suggestion, though, eh? Quote Link to comment Share on other sites More sharing options...
Scoobywagon Posted August 26, 2005 Author Share Posted August 26, 2005 Ya know....there's a digital expression just for people like you..... Quote Link to comment Share on other sites More sharing options...
NorthWet Posted August 26, 2005 Share Posted August 26, 2005 Ya know....there's a digital expression just for people like you..... I know it. I am very "up" on digital communication. :-p Quote Link to comment Share on other sites More sharing options...
iamtheq Posted August 26, 2005 Share Posted August 26, 2005 Along the lines of the "digital" compression tester, take the spark plug out, crank to '0' and stick a screwdriver in the spark plug hole. If you feel the piston at the top, you've found TDC. If the screwdriver goes way in, either you're 180 out or you've got a hole in your number 1 piston. Quote Link to comment Share on other sites More sharing options...
Scoobywagon Posted August 26, 2005 Author Share Posted August 26, 2005 I know it. I am very "up" on digital communication. :-p Yes, but what about the "extended" set? Quote Link to comment Share on other sites More sharing options...
NorthWet Posted August 26, 2005 Share Posted August 26, 2005 Along the lines of the "digital" compression tester, take the spark plug out, crank to '0' and stick a screwdriver in the spark plug hole. If you feel the piston at the top, you've found TDC. If the screwdriver goes way in, either you're 180 out or you've got a hole in your number 1 piston. Well, first off, sticking a screwdriver into an engine is similar to sticking something sharper than an elbow into your ear: It is a really BAD idea. Second, it is pointless, as he knows where TDC is; he just needs to determine which is compression-stroke. And if you have a hole in your number-1 piston, it might be because somebody used a sharp, hard, foreign object to check for TDC. And scooby, I got your "extended" set right here! Quote Link to comment Share on other sites More sharing options...
Caboobaroo Posted August 27, 2005 Share Posted August 27, 2005 I found the easiest way to find TDC without any special tools like a compression tester and blah blah blah. First off, pull the #1 sparkplug out and then thread it back in just a couple threads, just enough to let the pressure exscape from the chamber. Then put a ratchet with the correct size socket on it to turn the crank. Slowly listen for the hissing of the air rushing past the loose sparkplug and watch for the timing marks. If the hissing stops and you see no timing marks, keep turning and they might pop up. If they don't, keep turning until it starts hissing again and when it stops, the timing marks should appear. Then static time it by putting it on 8 deg. BTDC. Quote Link to comment Share on other sites More sharing options...
washakie Posted November 19, 2006 Share Posted November 19, 2006 Well, if you want to disturb the oil sealing on your valve cover, it is easy. Pull off the valve cover on the 1-3 side, crank the engine over to the "0" mark, and see if the rockers on the 1-3 cylinder are loose or depressing the valves. If they are loose, then you have TDC on the compression stroke for cylinder#1. Wanted to revive this thread... So, if the springs are loose, then I'm at the top of the compression stroke for #1, however, shouldn't the rotor then be pointing to the #1 wire?? Mine is pointing to #2. Do you think I've been running around with it 180 degrees out! Man, this thing is going to be HAPPY when I'm done if that's the case ..oh wait, just thought this through a little further... at TDC #1 should be taking IN fuel/air, so it's not until the second stroke that the spark should fire, eh? Okay.. So, here's the question, if I get this orientation way off, will I be able to adjust it later when doing the timing? Quote Link to comment Share on other sites More sharing options...
NorthWet Posted November 19, 2006 Share Posted November 19, 2006 Wanted to revive this thread... So, if the springs are loose, then I'm at the top of the compression stroke for #1, however, shouldn't the rotor then be pointing to the #1 wire?? ... ...oh wait, just thought this through a little further... at TDC #1 should be taking IN fuel/air... ...So, here's the question, if I get this orientation way off, will I be able to adjust it later when doing the timing? If the engine is at TDC, and if the cyl#1's valves are fully closed (rockers/followers are a little loose), then you are at TDC between the compression and power strokes for cylinder#1. The rotor should be pointing towards cyl#1's wire. Engine should not run with ignition 180 degrees out. Adjustment range is not great enough to compensate for being that far off. You would need to remove the distributor and insert it correctly... or swap the plug wires to match. Quote Link to comment Share on other sites More sharing options...
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