rebuild problems

Snitkerb

Member
I have an early 8n model, had knocking problems in the engine and started an engine overhaul, as well as painting on the way back
out. Starting at the beginning this is what I have done. I tore down the engine and replaced the #1 cylinder and sleeve,
everything else has been reused as it is in good condition. Painted and reassembled. First try: turns over well, but no fire, not
even a pop. So I checked electrical, spark on all plugs. Played with distributor, tried all options for timing and still no fire.
I checked gas, was getting gas to the carb but still nothing. It has a good flow of fuel, also used starter fluid and nothing
still. I removed the carb entirely and sprayed a touch of starter fluid into the intake and then finally had a pop, also a small
fire, so that wont be tried again. I did disassemble the carb and cleaned it thoroughly so I do not believe that is the problem.
Does anyone have suggestions on what to try next? Is it possible that when putting the crankshaft back onto place the camshaft
wasnt lined up perfectly? Would that do what I am explaining?
 
Cam shaft and crank shaft have gear that have to be timed correctly and if you di not do so it will NEVER start since the valves do not open when they should which also make spark not fire when it should
 
You can take off the front cover and check to see if the gears are timed correctly. You can remove the cam shaft after removing the valves assemblies.
 
Your post said that you had a knock in the engine and you replaced the #1 cylinder and sleeve. I assume you meant the piston and sleeve. Are you sure that is what was causing the knock? Did you check or replace the piston pin? To check the gear alignment, you will have to pull the front plate off the engine. If it has to be realigned, remove the valves and lifters, so that you can pull the cam shaft out an inch or so. You should have a mark on one of the teeth of the crankshaft gear and two marks on the cam shaft gear. Put the crankshaft mark between the two marks on the camshaft.
 
It was most certainly the piston that was causing the knock. Before the rebuild, everyone was telling me what you are saying, but when I got into the engine, I found the sleeve in pieces in the oil pan. So the head was slapping the sides of the wall and creating a knock. Everything checked out in good condition so I replaced the sleeve, head, and rings in that cylinder. When I reassembled I must have gotten the gears out of timing, so I will check that.
 
The head can not slap any thing since it is what holds the spark plugs. Yes the piston can just letting you know your terms need to be correct or some time we cannot help you but in this case no big deal
 

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