Don't overlook the Dist.cap and plug wires.The point gap can also cause backfire and bad running. If memory serves me correctly The single mark on the pulley is tdc the second 7.5degrees and the third is 10 degrees.Time it at 10 static and leave it alone. If you can adjust the valves they aren't dropped or stuck.Look for a problem somewhere else.
oleblue----- Original Message ----- From: "Gerald Livingston" <gerald.tcb@xxxxxxxxxxxxx>
To: <tcb@xxxxxxxxxxxxx> Sent: Friday, September 24, 2010 5:40 AM Subject: [tcb] Timing
Trying to figure out a most likely bastardized engine. Case and heads are both Hecho en Mexico. No other castings that I can see (at 0400 when I was out there adjusting the valves). It is a SINGLE PORT engine that was built somewhere around 2001 then supposedly only had 3000 miles put on it before the bus was parked. No way to tell if it's a 1500 or 1600. The pulley has 3 marks like so: | || I am assuming that the one on the left is TDC and the two on the right are 5 and 7.5 BTDC. It was timed to the one on the left and pushed the bus it's in now fine for 1000 miles like that. Then it kinda freaked out. Bucking and backfiring through the carb and losing power. A lot like a dropped or stuck valve. Hence the valve adjustment. they all looked good for a motor that has had 1000 miles put on it after sitting up for 7 or 8 years. I could still fit at least a .004 through all of them. I adjusted them back out to .006 but my brain is frazzled right now. Many long days at work. I have started second guessing myself. Should they be at .008 or .006? And, where the heck should I set the timing? Yes, it has a 009 on it. I'll use the unsharpened pencil trick later today to determine which mark is REALLY TDC. But once that's done does a single port get set to somewhere BTDC or ATDC? 5 or 7.5? I'm using a static light, not a strobe. Thanks all, Gerald
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