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Finding TDC D17 Series 1 gas? |
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Roscoe62 ![]() Silver Level ![]() Joined: 22 Aug 2014 Location: Louisville Points: 145 |
![]() ![]() ![]() ![]() ![]() Posted: 12 Jun 2017 at 9:10am |
Trying to check the valve gap. I can't see the timing marks due to the front-end loader being in the way. I could use a mirror, but that required two people, and I did not have any help.
Is TDC always when the distributor rotor button is pointing at #1 spark plug wire? AND, do I rotate the engine one full turn, until the rotor points at #4 plug wire to get it on the #4 compression stroke, or is it more complicated than this? As usual, I messed something up. After adjusting the valves (while hot) to 0.013", #2 and #3 cylinders are not firing at all. I checked this by removing the spark plug wires one at a time, it runs much rougher when #1 and #4 wires are removed, but no change when either #2 and #3 are removed. This engine was rebuilt about 100 hours ago, and it is having power problems after it gets hot, so I thought a quick check of the valve lash would be a good thing to rule out. I followed the instructions in the I&T book where you adjust in and out on #1, and one each of #2 and #3, and then rotate the engine until #4 is on compression and adjust those two, and the alternate ones on #2 and #3. So, me being me, I must have messed something up and I now have a new opportunity to find the problem. This has the Petronix electronic ignition, and nearly new plug wires from Steve @ B&B. I tried swapping the #2 and #3 plugs out with two used ones that were in my parts bin, with no success. I doubt that is the problem. Stopping today to get new plugs, but I am am thinking I messed something up when adjusting the valves. Some were just slightly tight, maybe .008 - .011 instead of the recommended settings. Anyway, now it is worse than before, running on two, instead of four. Thanks, - Roscoe |
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WF owner ![]() Orange Level ![]() Joined: 12 May 2013 Location: Bombay NY Points: 5009 |
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Do you have the 2 and 3 plug wires reversed? Since Firing order is 1-2-4-3, if 2 and 3 are reversed, you would only have 1 and 4 firing.
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WF owner ![]() Orange Level ![]() Joined: 12 May 2013 Location: Bombay NY Points: 5009 |
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TDC should be when the rotor is pointing at # 1. Turning one full turn should be TDC for cylinder #4. (Compression stroke should be just before TDC)
Power problems when warm could be a few things: ~Spark plugs not gapped right . Do not use Champion plugs. They don't work well in an AC 226 engine ~an obstruction of fuel ~coil getting weak ~poor condenser Does it have good power when you first start it and loses power after it warms up?
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Roscoe62 ![]() Silver Level ![]() Joined: 22 Aug 2014 Location: Louisville Points: 145 |
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No, I double checked the firing order. Sounds like I got the TDC thing correct. I re-checked the valve gap two additional times.
Could be the spark plugs, there were champion J8C's. I am picking the 295's today. Could be the coil. But it means that I have two weak coils, I swapped it out once already. Could be a fuel or air restriction. That is where I was heading before ruling out the valve adjustment. Once I get #2 and #3 firing again, I am going to clean out the air cleaner, and then get the carb rebuilt. Could also be ignition timing, since it was also getting hot. I will re-check that with a light and mirror, once (if) I get it firing on 4 cylinders. It did run good when cold and get worse at it warms up. But now, it is running on #4 and #1 cylinders only. It does not have a condenser. I have the electronic ignition on it. Thanks. - Roscoe.
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LeonR2013 ![]() Orange Level ![]() ![]() Joined: 01 Jan 2013 Location: Fulton, Mo Points: 3500 |
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I have seen engines run bad from the valves being too tight. They may run fair when cold but get worse as they warm up, even die . Are your rockers or rocker shaft worn bad? They can cause the problem with valve adjustment.
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Ted J ![]() Orange Level ![]() ![]() Joined: 05 Jul 2010 Location: La Crosse, WI Points: 18943 |
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As per DrAllis, "adjust all the valves to .015" COLD".
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"Allis-Express"
19?? WC / 1941 C / 1952 CA / 1956 WD45 / 1957 WD45 / 1958 D-17 |
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