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Everything posted by nicrguy1966
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Thanks. I'll be having another go on Monday (assuming the skin grows back on the hand I was using to pull the fan belt to turn the engine). If I understand you correctly, my tests today confirm that the cam timing is off, and finding the rocking position will tell me how much it's off. Onwards and upwards!
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Very good point about 2 TDCs. Now you've put some doubt in my mind if I did it right. If the crank was on the exhaust stroke, the exhaust valve would be wide open at TDC, and I'm pretty sure both were closed. But, before I start taking the engine apart, I'll do the check a 3rd time, maybe the way you describe this time (finding the rocking position, rather than setting to TDC). The earliest I'll have time is Monday, so another installment will follow!
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Ok, the latest chapter of my saga. I did the check on cam timing using the "rocker method" (as described in the workshop manual), and there might be something wrong. Assuming I did it right, after setting the gaps to 0.04" on 1 & 2, then spinning the crank around to TDC, the gaps were not the same. #1 had no gap, and #2 0.004". I did it all twice just make sure I didn't just make a mistake setting the gaps to 0.04". I've reset the gaps to 0.01" on all rockers and put the car back together as I need to use it next week. Does everyone think the timing chain cover needs to come off? Any other suggestions before I start such a major project (I assume I'll have to drain the cooling system and remove the radiator before I even start to try and remove the nut on the end of the crankshaft, and do I even have a spanner/socket that size?). Also, huge thanks to everyone that's offered suggestions so far, it's been a real boost to my confidence.
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I spotted a red convertible Vitesse in the background of this video about electric car batteries. It appears at around 1:55 and again around 2:05.
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It's a long standing issue that any time anyone has ever tried to set my ignition timing correctly, the car is virtually impossible to drive, until the timing is reset 'by ear'. It's only recently I've discovered how far from spec. my timing needs to be set to actually go. I'm looking forward to checking the cam timing. I'm sort of hoping it's wrong, although that will be a fair amount of work to fix. If it isn't that I'm pretty much out of ideas!
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I had a reconditioned engine fitted about 15 years ago (with hardened valve seats for unleaded petrol), so there shouldn't be 50 years of wear to worry about, and those 15 years haven't been high mileage. I wonder if my timing issues originate from that engine swap? I probably drove it for several years trouble free without ever checking the ignition timing.
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Update! I did a few tests this morning. 1) The timing marks seems fixed firmly to the pulley. No way I could move them in either direction, even with a screwdriver wedged into the TDC marker. 2) With the plug out of cylinder 1, I could easily feel the piston position with a screwdriver and although it doesn't move much at the top of the stroke, I could easily detect movement around 10 degrees before and after the TDC mark. So it seems the TDC mark is in the right place. 3) This time I took a photo of the strobe at idle (a smooth 650rpm). The mark is showing more than 20 degrees BTDC. 4) When rev'ed to 2000rpm, the timing mark is so far advanced, it's not visible from the angle the photo was taken at, so maybe 40 degrees BTDC! Even when set 'by ear' and running smoothly,I have noticed a lack of power at high revs and open throttle (e.g. accelerating from 50 to 70 in top gear). 5) When removing spark plug 1, I noticed the mixture was a little rich. Nothing too extreme, but worth noting. I would have expected a lean mixture given the K&N air filters. So that's all the latest news. Any idea what to try next?
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That makes a lot more sense than my idea! Hopefully it will not come to that. First I need to inspect the pulley, then try setting the crankshaft to TDC then see what the timing indicator position is. After that, maybe I'll think about removing the pulley, but it's something I'd prefer to avoid, especially as the car is currently drivable with its weird timing advance setting.