point/condenser

rgriffith99

New User
Hey guys,
Newbie here again looking for some advice. My '52 TO30 has a miss. I just changed the plugs, wires, cap and rotor. Also installed a new fuel filter and cleaned the sediment bowl. Any other advice to cure this? Also the manual I have does not show how to adjust the carburetor. What is the preferred adjustments? Thanks guys for helping me out! Your wisdom is greatly appreciated!
 
Is the miss at idle? Is the power ok under load? Can you isolate it by removing one plug wire at a time? Is the firing order suspect? Compression about the same on all cylinders?
 
If you have a miss, it is something that is affecting only the cylinder that is not firing. Points generally affect ALL cylinders - not just one.
Start by making a quicky compression check. Pull the coil wire and crank the engine. Do you hear each cylinder come up on compression? Does it crank evenly? Or does it sound like it goes a bit faster past one cylinder? If so, you could have a compression loss.
Compression loss can be caused by several things. A burned valve. A valve out of adjustment. A valve sticking and not fully closing. A bent pushrod. A blown head gasket.
If compression seems even, you can use an insulated tool to pull one plug wire off at a time to see if it changes RPM or smoothness. The one that does not seem to change anything is probably the one that is not firing. Check to see if there is spark at that cylinder.
If you do have a loss of compression, it is highly likely that you will have to remove the head to pinpoint the problem as well as to repair it.
 
If you have an in line filter o nit throw it as far from the tractor as you can it is likely to cause you trouble if not today it will tomorrow. Most in line filters a fuel system with a pump that has 7 PSI or more pressure. You have a gravity flow system and it is lucky if it has 1PSI pressure.

A miss can be caused by a bad distributor bushing which lets the point not open the same on all 4 lobe or a valve that need to be adjusted and it is either not opening as it should or not closing as it should.

Also now days it is a 50/50 thing with a new condenser. I have not changed a condenser in over a decade since 50% are bad right out of the box
 
If you have a miss the problem is fire and not gas when have you checked compression. You say new plugs fine remove them and lay them in order that they came from to see if there is any difference
 
Like others said, check the compression, check for a good blue spark at each plug, not just at the distributor. Each plug wire should deliver a 1/4" blue spark to ground. Be sure the centrifugal advance in the distributor is free and will spring back when released. Check for vacuum leaks.

Save the carb adjust for last.

The engine needs to be properly tuned and healthy to get a good adjustment.

Make sure the air cleaner is clear and clean. There is a wire mesh inside the canister that is often neglected. If packed with dirt it may have to come apart, but try soaking in solvent and blowing first. Be sure there are no mud dobber or mouse nests in the pipe. Get it up to operating temperature, set the idle speed down to 400-500 RPM.

The idle mixture screw is the small screw with a spring up by the mount flange. Unlike modern carbs, the screw regulates air, not fuel. Turning it out leans the mix, in richens it. Back it out until the engine stumbles, then back in to best idle. If it makes no difference, the idle speed is too fast or the idle circuit is clogged.

The high speed is the large screw on top of the bowl cover. It's a little tricky to adjust. Turn it in about a turn, then open the throttle as fast as possible. Listen to the response. If it hesitates, back the screw out about 1/4 turn. Keep repeating the test, adjusting the screw until the engine will take sudden throttle without hesitating. A single puff of black smoke is desirable.
 
So I removed the spark plugs and all seem to be fine. This miss is at idle. It does not seem to have any power loss when I'm driving it. I will have to purchase a compression tester and test that. Always fires right up with no issues whats so ever. The points appear to show no sign of corrosion also.
Thanks guys, I'll update after testing compression. By the way, what should the compression be?
 

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