Quote:
Originally Posted by newyorksong
Okie dokie muffler in and working well!
Thought the backfiring was prob the distributor
so after the "Where the heck is the dist hold down bolt"
and THEN after the "oh need special bent wrench" ...used a cutoff 9/16 open end and went in from behind the dist, and ordered the proper wrench)
I got her swinging and rough set it till the engine ran much better.
Ran over to the gas station and filled her up. She starts right up but still backfires on accel. Can't get her up over 40 or so.
So what is next? The carb is a Bendix Stromberg WW
and I think the accelerator pump is sticking a bit in the well.
http://syphan.phpwebhosting.com/pics/stromberg.jpg |
The following is my opinions of what I think it could be and what is needed to be done. I can be completely wrong because I am not there to inspect the engine. This also assume that a proper tune-up was performed (points set, plugs gap inspected, distributor timing set, as well as carburetor adjusted).
Are you saying it backfire (explosion back through the carburetor) or afterfire explosion through the exhaust system. Some people don't know the different, I was just asking.
If it is backfire and you didn't clean out the fuel system of the old gas before you started it. The intake valve could be sticking the the valve guide in the head. I would recommend doing a compression test. If you have a very low reading I would then do a leak down test on the low cylinder(s) to see where the leakage occurring. There is also a possibility of bent intake valve push rods. Pulling the valve covers and doing an inspection of the valve train. With the corresponding valve close the push rod should spin freely by hand. And while you are there check the valve clearances. If it is excessive you might have a bent push rod.
By chance did you notice the smell of the fuel when when you had the carburetor apart? If it smell different than normal, then then fuel is might be causing the problem of sticking intake valves. This had happen to some of our members.
If it is the intake valve sticking. You will need to dump the gas out of the tank and have it cleaned out as well as all of the fuel lines, fuel pump, and carburetor. And just maybe if you squirted some penetrating oil around the valve stems a few times and turn the engine over a few rev, it might unstick the valve(s). Otherwise the heads will have to be removed for repairs.