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Farmall M won't start

B

BDs 41

New User
I have a 41 M that I last cranked about 18 months ago. During that time I was restoring various parts and painting. Now when I get back together, the engine turns, just will not fire. I have spark at the plugs and fuel to the carb. It seems like fuel not getting to plugs. So for I have rebuilt the carb, installed new manifold gaskets, checked the timing, replaced points, condenser, and distributor cap. Still nothing. I do not think float is sticking but it dumps gas out the bottom anytime you choke it. The compression was about 120 on all cylinders.
 
What makes you think no gas to plugs? Are they wet at all? Flooding is a possibility but the tractors I have around here usually don't keep that secret very well. They wheeze and drip gas. You don't have to wait overnight to see if you flooded it. Clean and dry the plugs, crank it a couple times, shut off the gas and see if it starts. Lot of times I skip the plug cleaning...just shut off the gas, wait ten minutes and see if it fires up. If it continues to have a flooding issue in warm weather you may want to look further.
 
Howdy,
How can it be flooded if the plugs are dry? I have the same problem with my M. I got a few different suggestions when I asked the same question a few weeks ago but haven't gotten around to trying any of em. ( heat and heart problems have kept me pretty inactive lately ) I will be anxious to find out how you get your M going. I forget who suggested it, but the first thing I would try ( will try ) is pulling the plugs and squirting gas in the cyl to help with suction ( rings & cyl dry not enough seal ) and to fire up quick. Good luck.
Bob S.
 
Hold your hand over the throat of the carburetor and see if there's good suction. You will need a helper to make an attempt to start the engine.
If there's very little suction usually means you have low intake manifold vacuum. Make sure your
intake manifold is tight. Valves not seating well and leaking and worn rings & cylinders can cause low manifold vacuum. Hal
PS: Pour several teaspoonfuls of fresh gas on top one of the pistons. Reinstall the plug and see if the engine fires when trying to start it.
 
BD, I had exactly the same problem with my M. After trying all the suggestions from this forum, I pulled the manifold and after careful examination I found a dime-sized hole rusted between the intake and exhaust channels. Changed manifold and now it runs very well. Hope this helps.
 
Make sure you have a vaccuum on the gas. that was my problem on starting. if the sediment bowl leaks it wont work. you have to turn the gas on and then use the bleed valve on the side of the carb
 
Pull the spark plugs and squirt motor oil in each cylinder to help re-gain the compression lost during storage. Crank the engine with plugs out & ignition switch off. Install plugs and try starting the engine again.
 
(quoted from post at 16:20:32 08/08/10) Hold your hand over the throat of the carburetor and see if there's good suction. You will need a helper to make an attempt to start the engine.
If there's very little suction usually means you have low intake manifold vacuum. Make sure your
intake manifold is tight. Valves not seating well and leaking and worn rings & cylinders can cause low manifold vacuum. Hal
PS: Pour several teaspoonfuls of fresh gas on top one of the pistons. Reinstall the plug and see if the engine fires when trying to start it.
Click to expand...
Thanks for all the great suggestions however nothing has worked so for. The carburetor seems to have good suction when I put my hand over the choke flap. I have squirted starting fuild into the spark plug holes. Still no fire. The only fire i get is a large backfire out the exhaust when I rotate the distributor all the way counter clockwise.
 
(quoted from post at 16:20:32 08/08/10) Hold your hand over the throat of the carburetor and see if there's good suction. You will need a helper to make an attempt to start the engine.
If there's very little suction usually means you have low intake manifold vacuum. Make sure your
intake manifold is tight. Valves not seating well and leaking and worn rings & cylinders can cause low manifold vacuum. Hal
PS: Pour several teaspoonfuls of fresh gas on top one of the pistons. Reinstall the plug and see if the engine fires when trying to start it.
Click to expand...
Thanks for all the great suggestions however nothing has worked so for. The carburetor seems to have good suction when I put my hand over the choke flap. I have squirted starting fuild into the spark plug holes. Still no fire. The only fire i get is a large backfire out the exhaust when I rotate the distributor all the way counter clockwise.
 
Is your timing 180 out? If you removed your spark plug wires for painting you may have installed them incorrectly. Not sure how much tear down you did, but if you have suction your valves are most likely in time and with your plugs being dry, most likely a gas problem.

Have you tried starting fluid? If your main jet is adjusted incorrectly that could keep gas from getting to the plugs. Starting fluid should get their either way as long as your throttle is open. If it pops off with the starting fluid then something is messed up in your carb.
 
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