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Tractor Talk Discussion Forum

BF Avery to fire and run?..$80 in the mail!...seri

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morganstevenr

02-06-2007 21:20:26




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All,
I have been working on a 1948 BF Avery Model A tractor for the past year. I have had the tractor 95% put together for the past 4 months trying to get it to successfully fire and run. It fires once in a while but I cannot for the life of me get it to successfully run.

This is what I have done so far:
-Replaced all oil and piston rings
-Professionally rebuilt starter and carburetor
-Replaced all wiring, starter solenoid, gauges, coil, distributor points and wires
-Re-seated valves and made adjustments for .006 and .008 intake/exhaust
-Double-checked camshaft and crankshaft alignment with both dots in line
-New gasoline every week
-Replaced internal parts within the distributor if I burned them out

This is what I do every time I try and start it:
-Turn the key and check for spark at each plug
-Check for 90+ psi at each piston. The 6 volt batter only turns it fast enough to get it to around 45-50 psi so I use a 12 volt booster on the frame and starter to basically jump start it with a charger on the 6 volt battery. I also put a little bit of oil in the cylinders to help the psi.
-Time the distributor by rotating the #1 cylinder (first cylinder next to the radiator) to TDC of the compression stroke as it shows in the hole located on the belly housing. Then I place the distributor in and rotate the rotor so it is directly underneath the point of the #1 cylinder point. I then usually move it slightly counter-clockwise so that the point is just about to break contact, which is usually about 1/8 inch at the outer edge. If I move it clockwise to wear it just breaks contact it would move about ¾ inch at the outer edge which seems way too far.
-Make sure the wires are 1-2-4-3 in clockwise direction.
-Give her some turns and hope that it fires at least on the first cylinder.
-Check for good gas flow at the spark plugs or simply squirt some ether at the intake throat of the manifold after taking the carburetor off.
-After a few turns I will rotate the distributor 180 degrees just to make sure that I am not off.

I get it to fire by placing a tiny bit of ether or gas in each cylinder on most days. I do find it odd that it will suck in through the exhaust a little bit between pushing out the exhaust manifold. I assume that is because it is not firing which allows the power stroke to suck in some air through an exhaust valve that is open. If you have any information that you believe would help me please forward or reply. I would greatly appreciate it and would consider it a bargain if I can get the Avery fired up! Thanks for reading this in advance since I included so much info.

Respectfully,

Steve Morgan 1-515-238-9407

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MyrlfromPA

02-08-2007 04:22:18




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 Re: BF Avery to fire and run?..$80 in the mail!... in reply to morganstevenr, 02-06-2007 21:20:26  
Does this tractor have a coil or a mag? And if you are only 12 minutes from altoona PA I will gladly coem look at it for you as I am in bedford,Myrl



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morgansteven r

02-08-2007 11:32:15




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 Re: BF Avery to fire and run?..$80 in the mail!... in reply to MyrlfromPA, 02-08-2007 04:22:18  
OK...over lunch I went home and changed the exhaust to .010 and the intake to .008. I also checked the distributor wire connections and adjusted the timing as Myrl instructed. It was sputtering a little as I was turning it over with just the 6 volt on a charger. It only sputtered the first two times I turned it over and then stopped over the next few cranks.

I then dripped some ether, and not much, straight in the cylinder and turned it over. IT ACTUALLY, but barly, fired on all cylinders and I had a lot of white smoke but did not really "start". It seems like the timing is close but there is something else wrong. Could I have the wrong spark plugs in it? Maybe the don't produce spark that is "hot" enough?

Myrl...I couldn't remember what the .20 was for...is that the distance from the copper peice on the rotor to the points underneath the distributor cap or where the spark is created inside the distributor when the ?arm?peice? breaks contact and creates sparks. Sorry..new to some of this.

Thank you for the continued support!

Steve

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MyrlfromPA

02-09-2007 05:33:17




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 Re: BF Avery to fire and run?..$80 in the mail!... in reply to morgansteven r, 02-08-2007 11:32:15  
Ok the .020" is the contac point gap when points are completly open. They are below the rotor inside the dist. Also if timing seemed better and it fired but not run you may not be getting gas though the carb right. try holding your hand tight over carb and spin engine maybe with 12volts and see if you can get gas to flood out the carb. If not and carb has set awhile empty your needle valve may be stuck shut. Rememdy by removing fuel line and blowing air through the fuel inlet in the carb. Use short blast from a blow gun and make sure you have ample supply of fuel coming through the line to the carb. Keep us posted and maybe start a new thread~ Myrl

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morganstevenr

03-28-2007 07:36:46




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 Re: BF Avery to fire and run?..$80 in the mail!... in reply to MyrlfromPA, 02-09-2007 05:33:17  
Myrl,

I could not find this posting no matter what I tried over the past ?2? months. I finally found it and wanted to let everyone know that I have it purring like a kitten and I am VERY, VERY grateful for everyone's help. I am replying to your post since it was the gap in the contact point that led me to the fact that the condesor was shot and the contact was actually too worn as well. I believe it was from the 12 volt jump that I used directly on the starter approximately six times. I also moved the distributor cap slightly like you said over the phone and that got it started. Alberta Mike's description got me close but it was the counter-clockwise quarter turn that you described that got it to fire (thanks for the response though Mike!). Please reply to this email or call me with the following number and I can then mail you the $80. I am sure that I can remember your voice from our previous conversation. However, it you would rather post an email address using your user name I suppose that would ensure that it is actually your address. I wanted to find this posting because I will gladly pay up since I could have spent another month or two trying to figure it out. A deal is a deal!!!

Thanks again!

Steve Morgan

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morganstevenr

02-08-2007 05:57:47




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 Re: BF Avery to fire and run?..$80 in the mail!... in reply to MyrlfromPA, 02-08-2007 04:22:18  
Myrl,

Thank you for the offer, and believe me I would take you up on it if I could, but the show is actually in Altoon, Iowa. It always amazes me how there seems to be six towns with the same name all over the US.

The tractor has a 6V coil which I replaced new about 6 months ago. I have heard that the coils go bad....but I assumed that there would be inadequate spark or no spark at all at the plugs..is that correct? Look forward to your reply and have a great day!

All,

The gaps in the intake tappets was .010 in the Avery R with the same engine. The exhaust tappets were .011. That seems like quite a difference from .006 and .008 but would that make it not fire correctly?

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Alberta Mike

02-07-2007 16:24:28




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 Re: BF Avery to fire and run?..$80 in the mail!... in reply to morganstevenr, 02-06-2007 21:20:26  
Did you ever have the camshaft out? Remember that each cylinder must go through 4, 180 degree rotations (two, 360 degree or 720 degrees of rotation) to complete one 4-stroke cycle, that is four, 180 degree rotations during a complete cycle. Having said that, take off the valve cover and make sure that the #1 piston is at TDC and that the exhaust valve has just closed before getting there @ TDC. Then rotate the crank 180 degrees and see that the intake valve for #1 has opened during this intake stroke rotation. Then rotate another 180 degrees and see that both intake and exhaust have closed during this 180 degree compression stroke. Then another 180 degree rotation and both valves should have stayed closed during the power stroke. Then finally, a final 180 degrees and the exhaust valve should be open during this exhaust stroke. Now that is for the #1 cylinder. The next cylinder in the firing order (whether it be #2 or #3, I don't remember which one is second) should go through the same sequence of valve opening and closing during the four, 180 degree rotations for that cylinder. Then the third and finally the forth cylinder in the rotation should follow the same pattern. If this happens, then you know the camshaft and crankshaft are hooked up properly, well at least close and that the timing marks were correct. If this all checks out, then do it again and make sure that when the #1 cylinder has completed two, 180 degree rotations (one full 360 degree circle), that the rotor in the distributor is pointing to the #1 terminal on the distributor cap. And so on adn so on for the remaining three cylinders.

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morganstevenr

02-09-2007 05:22:52




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 Re: BF Avery to fire and run?..$80 in the mail!... in reply to Alberta Mike, 02-07-2007 16:24:28  
Mike,

I have not had the camshaft out...although over a year I also wondered if I had forgotten about maybe accidentially dropping it down or something. So I took the front cover off and checked the dots on the cam and crank shaft which line up perfectly.

Also, there are a couple "gear heads" at work that know about car engines and went through a similar description of how to determine the compression stroke so I am confident that I have the correct TDC on the correct piston. I tried it yesterday and it fires on all four cylinders with ether added to each cylinder....It seems like it just isn't sucking up the gas through the carburetor. I will check the sequence again and then check for suction at the bottom of the manifold with the carb off I guess.

Thanks for the help and I will be posting again later today after working on it for a while.

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Aaron Ford

02-07-2007 10:51:03




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 Re: BF Avery to fire and run?..$80 in the mail!... in reply to morganstevenr, 02-06-2007 21:20:26  
Well, I am going to try a few guesses.

Reverse 2 and 3 to see if the distrib is wired backwards. This is essentially reversing all wires starting at No 1, but if you look at it you would see that the only ones that change are 2 and 3. As most engines run a 1342 order, it may be that Avery marks their cylinders from the rear.

I am sure that you are checking for spark, but is it 180 out? One way to check this quick is to Rewire with #1 on the #4 distributor terminal, the replace the wires following the firing order around. Then try the 2/3 swap again. If none of this helps, look to the cam/crank gears for proper alignment.

HTH

Let's go Mountaineers,

Aaron

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morganstevenr

02-07-2007 09:53:16




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 Re: BF Avery to fire and run?..$80 in the mail!... in reply to morganstevenr, 02-06-2007 21:20:26  
Thanks for the replies...I had no idea that I would get this much. I will try and answer a couple of these in the same reply if that"s all right...
Errin, I would agree that 45-50 is really low. I do put oil in the cylinders and it will get to 100 psi in each cylinder to no avail. However, I do have to turn the starter using a 12 volt boost directly on the starter and frame because the 6 volt starter will only crank it two times since the psi is so high.

Myrl, It has 1243 directly on the manifold as the firing order.

George, THank you big time for the webiste...Altoona is actually 12 minutes from my house!!!!

Rusty, I have two BF Avery books, the first being a reproduction BF Avery oweners manual and a MMoline parts and maintenace book for the BF Avery A. One book has the engine specs for valve lash to be .006 and .008 and the other has it as .01 and .008. I also have a running BF Avery R with the same engine that I will check with a feeler gauge (should have done that already I guess but figured at least one of the book had to be correct)

2x4, I though of advancing the cog but I moved the distributor in a clockwise motion at 1/4 inch increments ALL the way around to see if I could get it to fire. I did not have any luck but I guess I should put the distributor where I think it should be and try it again.

I think I will go home tonight and check the running Avery and it"s valve clearence with a feeler gauge and see how much different it is from the .006 and .008 in the book. Thanks guys for all of the replies...I will give it a shot and catch up with this posting tom morning.

THANKS AGAIN!

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Errin OH

02-07-2007 08:37:00




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 Re: BF Avery to fire and run?..$80 in the mail!... in reply to morganstevenr, 02-06-2007 21:20:26  
Did you hone the cyls? Did ya check the end gap on the rings? 45-50 psi sounds low for any engine.

I did the same to a ford 134 a few years back (5 or so). Wouldn't start for crap and worse if cold. Bone but broke and need this thing to run bad (my loader backhoe and I was building a house). Dropped in a new set of rings and crossed my fingers. No go. Turns out the end gap was worse than the old rings. My trick to get it to fire was to put a little oil down each cly. This would hold just enough psi to get it to fire and spin fast enough to run if the engine was warm (no power and stalled out quick). Ended up with a set of over sized rings cut down to the proper end gap by hand, after honing the p1ss out of it to get it some what round. Ran like a new one and only cost me $100. It had a bit of piston slap but ran strong and is still going today.

And I agree the valves sound a bit on the tight side, but I would do whatever the book says (my ford was up at .015).

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MyrlfromPA

02-07-2007 07:55:31




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 Re: BF Avery to fire and run?..$80 in the mail!... in reply to morganstevenr, 02-06-2007 21:20:26  
The firing order does not seem right to me I think that engine as like most 4 cyl engines shoud be 1342 and have you checked which way your dist turns when engines cranks over? Just a thought Myrl



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JRB- Ind.

02-07-2007 11:36:57




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 Re: BF Avery to fire and run?..$80 in the mail!... in reply to MyrlfromPA, 02-07-2007 07:55:31  
1-2-4-3 is the correct firing order! Checked in the research & info under tune-up specs on this site. My Fords are the same.



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RAB

02-07-2007 09:42:04




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 Re: BF Avery to fire and run?..$80 in the mail!... in reply to MyrlfromPA, 02-07-2007 07:55:31  
Myrl, Yours is most likely post to correct the starting problem, I would think.
Regards, RAB



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George G

02-07-2007 06:52:35




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 Re: BF Avery to fire and run?..$80 in the mail!... in reply to morganstevenr, 02-06-2007 21:20:26  
Try here



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RustyFarmall

02-07-2007 04:49:59




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 Re: BF Avery to fire and run?..$80 in the mail!... in reply to morganstevenr, 02-06-2007 21:20:26  
I think you need to double check the specs on the valve lash. I'd think it should be at least twice what you have them set at.



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RAB

02-07-2007 09:33:53




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 Re: BF Avery to fire and run?..$80 in the mail!... in reply to RustyFarmall, 02-07-2007 04:49:59  
Rusty - that shouldn"t prevent it from starting. Only too tight when it warms up.
Regards, RAB



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jpl

02-07-2007 00:24:44




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 Re: BF Avery to fire and run?..$80 in the mail!... in reply to morganstevenr, 02-06-2007 21:20:26  
I dont no much about averys but seems awfully tight on valve adjs to me. you say oo6 and oo8.



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2x4

02-07-2007 00:14:57




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 Re: BF Avery to fire and run?..$80 in the mail!... in reply to morganstevenr, 02-06-2007 21:20:26  
sounds like it may be out of time. Rare occasions the timing marks don't work & you have to change the timing cog by cog til you get it.



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RAB

02-07-2007 09:37:37




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 Re: BF Avery to fire and run?..$80 in the mail!... in reply to 2x4, 02-07-2007 00:14:57  
You can check with a dial gauge or feeler gauge to find start of lift and compare it with engine specs for valve timing (degrees before or after TDC).
Regards, RAB



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