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84 prospector 
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Joined: 30 Aug 2022
Location: California
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 Posted: 08 Sep 2022 at 11:28pm |
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Could it be backfiring because there isn’t enough back pressure? it is running basically open manifold right now. The previous owner set a pipe on top of the manifold and tied it down with bailing wire then slid a 90 degree angle pipe over that. It is not sealed to the manifold outlet, just set on top/ around it
Edited by 84 prospector - 09 Sep 2022 at 12:37am
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DiyDave
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Joined: 11 Sep 2009
Location: Gambrills, MD
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Posted: 07 Sep 2022 at 4:42am |
Choke on runs better could also be air leak at choke shaft. Spray some solvent at the choke shaft(outside carb) if it sounds better briefly, there's your leak... 
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
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Posted: 06 Sep 2022 at 10:51pm |
YEP....... a general tune up should be on the list in the future..
choke on is restricting the air inlet... That means your running out of fuel... Could be partly pluggage in the carb, restricted fuel filter .
Edited by steve(ill) - 06 Sep 2022 at 10:53pm
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84 prospector
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Posted: 06 Sep 2022 at 10:48pm |
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I sprayed the valves down with wd 40 and watched to see if it looked like any were sticking and there weren’t any that I could see, I just put a brand new coil on it when I got the tractor, it was a standard ignition one I think. I haven’t replaced the plugs yet or the wires. It does run a little better with the choke on
Edited by 84 prospector - 06 Sep 2022 at 10:51pm
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steve(ill)
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Location: illinois
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Posted: 06 Sep 2022 at 10:45pm |
sometimes a backfire is a sticky valve stem due to setting for years... Running a while can fix that... But you should also note that under load, i would think.
also remember the motor is 70 years old... Could be spark plugs , wires , coil slightly low on power , distributor cap crack or carbon tracked, carburetor not quite right, etc, etc...
Edited by steve(ill) - 06 Sep 2022 at 10:48pm
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Like them all, but love the "B"s.
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84 prospector
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Posted: 06 Sep 2022 at 10:43pm |
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It backfires at both, not so bad at idle more of a miss or small backfire
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84 prospector
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Posted: 06 Sep 2022 at 10:42pm |
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I’m gonna go back through and double check all the valves are adjusted correctly tomorrow, and see how it runs again.
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steve(ill)
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Posted: 06 Sep 2022 at 10:40pm |
carburetor could be off a little..... tractor has been setting a long time... maybe just run a while and see if it BREAKS IN ??
backfire at low idle or high idle or both ?? ( when NOT under load)
Edited by steve(ill) - 06 Sep 2022 at 10:42pm
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Like them all, but love the "B"s.
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84 prospector
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Posted: 06 Sep 2022 at 10:07pm |
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I set them all at .015 and it is running a little better but is still backfiring out the exhaust. When I put a load on the engine going up a hill it smooths out completely.
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84 prospector
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Posted: 06 Sep 2022 at 9:52pm |
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Ok so whenever a cylinder is at tdc the two valves for that cylinder will be closed?
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steve(ill)
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Posted: 06 Sep 2022 at 9:38pm |
doesnt the MAG snap at TDC ?
OOPS Im on the wrong post.. Yours is a CA with a DISTRIBUTOR.. NO SNAP... You will have to remove the spark plug and stick a wire inside the hole and feel for the piston at the top... Or after the INTAKE close, just turn more than 90 degrees and you should be close.
OR... there is a 1 inch round hole in the side of the bell housing that is used to time the motor.. After the intake valve closes, have someone look in the hole as you ROTATE the motor and stop at the CENTER or TDC mark.
Edited by steve(ill) - 06 Sep 2022 at 9:45pm
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Like them all, but love the "B"s.
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84 prospector
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Posted: 06 Sep 2022 at 9:03pm |
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I am not hearing any snap
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steve(ill)
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Posted: 06 Sep 2022 at 8:34pm |
when #1 is at top dead center (CENTER)... both valves will be closed and BOTH can be adjusted.. Rotate 180 degrees and #2 will be ready... Rotate 180 degrees and #4... Rotate 180 degrees and #3 will be ready...... you adjust BOTH INTAKE and EXH when that cylinder is at TDC.... you can hear the SNAP telling you that you are at CENTER.
Intake - Compression -Power - Exhaust are the 4 strokes ....... when you see the INTAKE valve CLOSE, rotate about 180 degrees until you hear the SNAP for each cylinder.
Edited by steve(ill) - 06 Sep 2022 at 8:37pm
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Like them all, but love the "B"s.
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84 prospector
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Posted: 06 Sep 2022 at 8:27pm |
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Ok thanks, just to be sure I’m doing this right, when I’m adjusting the #1 cylinder i rotate until either the exhaust or intake valve is completely closed (spring all the way up) and adjust that valve that is completely up to .015, then rotate the engine until the other valve is completely closed/ up and adjust that one to .015
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steve(ill)
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Posted: 06 Sep 2022 at 7:52pm |
there is a round hole in the radiator wrap around a couple inches below the grill... That looks at the crank shaft pulley front end.... There is a "hand crank" that goes into that hole.. Basically a 5/8 inch rod with a TEE on the end to engage the tangs on the pulley...
you might also be able to engage the PTO shaft and turn it with a pipe wrench and roll over the motor... It is about 3 to 1 ratio ... put the transmission in neutral.... IGNITION OFF...... or plugs removed.
--------------------------------- basically the hand crank has something like a 1/4 inch roll pin about 1-1/2 inch long ( im guessing) that grabs the inside of the pulley..
Edited by steve(ill) - 06 Sep 2022 at 8:01pm
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Like them all, but love the "B"s.
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84 prospector
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Posted: 06 Sep 2022 at 7:20pm |
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Kinda a dumb question but where can I spin the engine by hand? The crank pulley is too hard to grip by hand and spin
Edited by 84 prospector - 06 Sep 2022 at 7:23pm
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steve(ill)
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Posted: 06 Sep 2022 at 7:12pm |
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No.... your fine... 1 - 2 thousandths LOOSE does not hurt.
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Like them all, but love the "B"s.
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84 prospector
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Posted: 06 Sep 2022 at 6:38pm |
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Or will it make that big of a difference to go .014
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84 prospector
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Posted: 06 Sep 2022 at 6:37pm |
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I should be good at .015 right?
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steve(ill)
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Posted: 06 Sep 2022 at 4:02pm |
Steve is right... .002 MORE if your setting cold.... Book actually says .010 HOT for B and C.. ........ but .012 HOT for CA ?????? YOUR CHOICE !
TOO tight is bad... A couple thousands loose is not a deal breaker.
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SteveM C/IL
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Posted: 06 Sep 2022 at 1:06pm |
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Rule of thumb is .002 more cold than hot (book). More likely to have even adjustment cold. Hot begins cooling the moment you start and unless you are proficient and experienced it may well get away from you.
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84 prospector
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Posted: 06 Sep 2022 at 8:35am |
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This is done while it is cold right?
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steve(ill)
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Posted: 06 Sep 2022 at 8:26am |
look at the intake valve... when it closes, you are coming up on compression... about 90 degrees you will be at TDC.. ( center) .. you will also hear the SNAP !! .... Adjust the valves on that cylinder that just came to TDC ............Should be about .015 inch clearance between the valve top and the adjust screw above it.
Rotate the motor 180 degrees and look for the NEXT cylinder to come to TDC... should be in 1-2-4-3 order ..... you can start at any cylinder ,, ( ex 4-3-1-2 )
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Like them all, but love the "B"s.
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DiyDave
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Posted: 06 Sep 2022 at 4:11am |
Pull the valve cover and you'll find the rocker shaft, at the push rod side, you will see the adjusting hardware. I would recommend you acquire the shop manual, it has the procedure in it. While you have the VC off, look at the freeze plugs and check for leaks...
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84 prospector
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Posted: 05 Sep 2022 at 10:57pm |
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Before I put the hood and everything back on I would like to adjust the valves and make sure none are sticking. The tractor backfires and smokes it seems when a certain cylinder fires. How do I adjust the valves on one of these engines?
Edited by 84 prospector - 05 Sep 2022 at 11:28pm
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plummerscarin
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Posted: 05 Sep 2022 at 5:53pm |
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Dang, sounds like one of my days. Keep plugging. I'm rootin for ya
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84 prospector
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Posted: 05 Sep 2022 at 5:07pm |
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Well both bolts holding the radiator in from the bottom sheared off when I took it off, I tried heating the studs up and turning them with vice grips but had no luck. So instead I ground them down and welded new studs on them and put new nuts on. Putting it back on now hopefully no leaks!
Edited by 84 prospector - 05 Sep 2022 at 5:09pm
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Brian G. NY
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Posted: 05 Sep 2022 at 9:14am |
 plummerscarin wrote:
Well that looks pretty good |
I second that....especially considering the original condition!
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steve(ill)
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Posted: 04 Sep 2022 at 10:21pm |
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yes 1-1/4 inch hose ID.
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Like them all, but love the "B"s.
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84 prospector
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Posted: 04 Sep 2022 at 10:12pm |
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Got all the holes sealed up, the bolts holding the radiator down were sheared off by the previous owner so I’m going to heat them up and Try to get them out and out of new ones on. All the hoses were junk so I am going to need to get new ones. What’s the inside diameter of the radiator hoses? 1 1/4?
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