I messed up - removed head without being at TDC on compression stroke
02-24-2019, 09:09 PM
#1
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I messed up - removed head without being at TDC on compression stroke
I’m a newbie and am doing a top and bottom end rebuild on my 22re. Accidentally removed the head without being at TDC on compression stroke. The #1 piston is at the highest point, but the #1 rocker arms are tight to the Cam lobes with zero play.
My next step is separating the block from the trans and pulling it and putting on a stand. (Had only planned to rebuild the top end until I saw the clean piston edges meaning worn rings from what I’ve gathered(is this correct?)
My question is how should I go about getting the engine set to TDC on the compression stroke when I go to reinstall the head and do the timing chain replacement??
Feel free to inclue any other useful info for a first time engine rebuilding newbie. I’ve gathered a lot of information and feel confident about some things, just knew I was gonna have a hiccup or two along the way. This is the first hiccup. Thanks for your help!
02-25-2019, 05:34 AM
#2
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Position of engine is totally irrelevant on disassembly.
Following correct assembly sequence found in the factory service manual will insure that the engine goes back together correctly.
Following correct assembly sequence found in the factory service manual will insure that the engine goes back together correctly.
03-06-2019, 08:05 PM
#5
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I did manage to get the last cap offf and am down to the bare block, ready for the machine shop.
Will try to start a build thread next.
03-07-2019, 02:26 AM
#6
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Doesn't cause any issue upon disassembly. For reassembly, before the rocker assembly is off, rotate the camshaft so the dowel on the front is at the 12 oclock position. If your crank is rotated so the keyway is up, (piston 1 and 4 at the top) then you are good. The crank doesn't know whether it's at TDC compression on #1 or #4. And with the head removed, there is no difference. Valves and spark are all run off the cam so there is no such thing as 180 out. Well I suppose there is but you'd have to install the distributor wrong. Align the cam sprocket as close as you can visually before installing it on to the cam. Usually you can get it spot on, if not, only off by a tooth. Don't worry about the bright link on the chain, it's a guide to help you line things up but not really needed. If the crank is at zero degrees, and the cam sprocket dot is straight up, everything is exactly as it should be.
03-07-2019, 08:44 AM
#7
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Doesn't cause any issue upon disassembly. For reassembly, before the rocker assembly is off, rotate the camshaft so the dowel on the front is at the 12 oclock position. If your crank is rotated so the keyway is up, (piston 1 and 4 at the top) then you are good. The crank doesn't know whether it's at TDC compression on #1 or #4. And with the head removed, there is no difference. Valves and spark are all run off the cam so there is no such thing as 180 out. Well I suppose there is but you'd have to install the distributor wrong. Align the cam sprocket as close as you can visually before installing it on to the cam. Usually you can get it spot on, if not, only off by a tooth. Don't worry about the bright link on the chain, it's a guide to help you line things up but not really needed. If the crank is at zero degrees, and the cam sprocket dot is straight up, everything is exactly as it should be.
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03-07-2019, 10:53 AM
#8
The cam Dowel goes in the twelve o'clock position (dowel is on a valley), the Dot will be just to your left (dot is marked on a tooth)
Edit: i failed at reading comprehension, or he just fixed it.
Last edited by Co_94_PU; 03-07-2019 at 10:55 AM.
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