OT - old grain truck

Anonymous-0 · Jan 23, 2009

Old f-600, 292 v-8 (y block) what would cause it to puff back through the carb and stall, soon as you let out the clutch, when warm, then hard to start again have to keep crankin er, til she catches. Not backfiring through the carb, just a nice PFFFFFFT ! don't notice any gas odor or fumes after. Tune up is new, plugs wires, points etc., this is a good running motor actually, oil pressure is good, like 80 when cold and 30-40 warm think she might have been freshened up at some time, odometer is correct at 85,000 miles original motor. Starts up from 0-10 degrees F, full choke, first try.

Been through this on small block chevy's, timing if I remember, easy fix usually. I've never been in the carb on this one, think it's a factory 2bbl holley, or whatever the standard truck y block carb was. Sounds like it starves for fuel, but what's the pfft... through the carb from ...
maybe it's a carb issue, I should rebuild it anyway, good at doing those too, that and dig up a timing light and check that too. I've got the orginal service manual for the '64 600-800's, funny, while fixin er up a few times, if you did exactly what the book called for, it worked like a charm, electrical and brake items. Fun old truck, for occasional trips, nothing heavy, and loading with fire wood logs around here.

Janicholson · Jan 23, 2009

Two things cross my mind. The first is a compression check. If an intake valve is going bad, the loading might cause a backfire through the bad valve.
Lean condition carberation. Low float, or plugged jet, or bad accellerator pump. Round cover 4 screws usually either leak gas, leak air, or don't pump. Will give a stumble "tip in" lean condition.
Keep us informed. JimN

John B. · Jan 23, 2009

Check the vacum advance on the distributor. It's probably bad. When you put a load on it it's causing the RPM's to drop retarding the timing. I've had it happen to me and seen it alot on the older fords. It will act up at stops signs or every time you take off from a dead stop. Also check the mechanical weight advance under the distributor plate, these weight like to rust up and freeze not letting the timing advance also. That or the weights can be wore out too! These things are easier to check than pulling all the plugs out and checking the compression especially if it runs good other wise. A burnt valve will act up all the time and the engine would have a noticable miss while running.

Let us know what you find.

John B.

GeneMO · Jan 23, 2009

UUUgggghhhhh, Is that whacky tobacky in the bed of that truck????

Gene

JBMac · Jan 24, 2009

In my humble opinion I think the fact that it"s a Ford is the main problem. Just kidding

Allan in NE · Jan 24, 2009

BIlly,

It just needs a pump plunger; simple little fix.

Allan

Don c · Jan 24, 2009

Agree with Allan, need pump plunger, known problem with them..

ericlb · Jan 24, 2009

i'm with allan, the first thing is to rebuild that old carb, this one is easy there's just not that much in there, important you will need the carb number to get the right kit, if it is a holley its stamped up and down on the float bowl, if not remove the carb, drain it, plug the holes in the intake manifold with clean rags!!! [ dont ask lol] and take it with you to the parts store, find the old fella in there , the kid at the counter may have never seen a carburetor, [ long but true story] the biggest thing is get it clean after you dissassemble it, soak it in carb cleaner or if you have a old buddy with a garage- pre fuel injection era -he probably has one of the handy old carb cleaning tanks that rotate the parts in the cleaning solution, then rinse it off and blow out all the passages, before you reassemble it, the best carb kit out there wont fix a plugged passage inside the carb, the pffft is probably just the air coming back out the carb, when it stalls out the engine will usually backspin a little,thats a nice straight old ford for its age and the carb kit isnt much money, fix it up and you'll have a keeper

1936 · Jan 24, 2009

Distributor cracked? In you tune up left overs put the old cap back on to see if you have the same back fire in the carb. Timing is another item with possible worn distibuter bearings you can have spark all over under the cap. Has the key been left on and not running and got the coil a little hot for the hard start?

It's the small things to sort out before the carb job. Now if the carb float is a fiber one by now is soaked up gas and is sinking.

One last thing if the hound had not stopped to ---- it would have the rabbit.

Anonymous-0 · Jan 24, 2009

Are you looking for whacky Tobacky ??????

Allan in NE · Jan 24, 2009

Also,

That "pffffft" sound your hearing is just the compression/weak explosion coming back up thru the carb after the fire has gone out from the weak burn.

Fuel demand at that moment is high and the carb is not delivering as it should, therefore the engine can't run on an air-rich mixture and just sputters to a halt.

Yer makin' me feel old this morning. :>)

Allan

Kentb of SWMO · Jan 24, 2009

Check the timing. We had a later L-600 rescue truck with a 361 that would cough and puke every time it was shifted. Backing into the station was a bear. I finally got around to working on it. Checked the timing. It was firing after TDC with the vacuum advance connected. I set initial at 6 degrees. Run better still backfire a little. I finally stop advancing the timing when I got to 14 degree initial. Truck run good and does not kick back against the starter when cranking. I have thought about cranking in another couple of degrees but have not.

Kent

Crem · Jan 24, 2009

I would take the air cleaner off and with the engine off, look down inside of the carburetor while you move the gas pedal linkage. You should be able to see if the accelerator pump is squirting a stream of gas in there. The pump linkage is usually adjustable for more or less stroke. Like Allan said, the pump is probably bad.

Anonymous-0 · Jan 24, 2009

High quality, grown on prime land on the best farms, dried and cured to perfection, they don't like it too dry and harsh now! Sure pays a lot more, but there is kind of a slight problem with the law and the subsequent long but mandatory detour directly to your local correctional facility !

Dropped the truck off load and all, take the money and run ! Darned renegades peddlin that green wheat, leavin a 3/4 truck full in the barn like that, what in heck were they thinkin ?

Actually was 3/4 of a load of some real nice 3rd cut hay grass alfalfa mix, bales were kind a loose and the grass was real leafy, hayburners love this stuff.

Anonymous-0 · Jan 24, 2009

Will do, probably last after doing the other things mentioned here, used to be able to get em close without a light, I'll have to get one and check it out.

teddy52food · Jan 24, 2009

Loose timing chain. Advance the timing an extra 5 degrees ahead of specs. If it kicks the starter, put it back. If not leave it.

Anonymous-0 · Jan 24, 2009

Billy just bring that old girl to my farm...you dont want her anyway! LOL.

Very cool truck.

Sad thing is we had a Ford F-800 tandem dump truck here last year. Sat for 6 years, It had a 534 V-8. NO ONE wanted it, it had 80,000miles clean body, ran good, and dumped.

Hate to say it we parted it, and scrapped the rest.

Anonymous-0 · Jan 24, 2009

Old, naaa... you got a ways to go before that really happens, but I hear ya, some hard work and aggravation can quickly remind one of age, just getting a load of firewood logs up the hill on that old truck yesterday, you know when a whole bunch of little things go wrong, domino effect in full swing and you're runnin the shoe leather express back and forth to get it done, and you want to say I'm getting too old for this crap, but don't really mean it

That carb ought to be an easy one, I'll get the kit, have done lots of carb rebuilds before, had a '84 ranger once that the diaphragm/plunger in the accelerator pump wore a hole, started dumping fuel, easy one to rule out for starters. That little cough really screws up the works, tire chains dig in, more resistance in 2nd gear and pffft, stalls out, certainly helped make the day longer yesterday !

Anonymous-0 · Jan 24, 2009

Your right, I will check those things out, don't think it's cracked, she starts quickly, even when real cold outside. Don't think the key has been left on, maybe briefly after a stall out.

Anonymous-0 · Jan 24, 2009

Probably is the carb, like was mentioned the accelerator pump, there's a guy familiar with older fords at the Napa warehouse, should be no problem at the parts counter, and I'm sure to get the numbers off it. I'm pretty good at foolin with carbs, most seem to be easy to clean, inspect and rebuild.

She looks better in the photo, 1st truck, did not cost a whole lot, lot of repairs needed though, though it has some issues, typical rust in a few areas, but is restorable, I just try to keep er road ready, in case it's needed, couple 30 mile trips a year if that. I like all the 61-66 ford trucks, kind of a dog on the hills, would be better with a 5 speed, it's paid for itself though and still a handy thing to have.

Anonymous-0 · Jan 24, 2009

Will do, when I tuned er up, things looked good under there, but you never know, if after I go through the carb, and it still does it, we'll have to get further into it, should be able to figure it out, will definitely post back, old and simple to work on at least.

Anonymous-0 · Jan 24, 2009

Nope, but that may be sometimes, but I think they're all good.

Anonymous-0 · Jan 24, 2009

Yep will do, hopefully what you amd the others said about the carb.

Anonymous-0 · Jan 24, 2009

I've done that on small block chevy's and gotten close before using a light, think I remember if, distributor or timing chain was off, you could advance or retard 180 degrees on the dist. though that was a quick fix, probably not the best thing to do either but I've seen it work way back when, those were always fun to work with, easy and simple.

Anonymous-0 · Jan 24, 2009

She looks better in the photos, I've seen some really nice ones with low mileage on e-bay over the years, old, slow, but a lot of em still around. Not really something for everyday road use, but it does draw some attention for some reason. I'd really enjoy a '61-'66 stepside f-250 with fwd, or similar, seems to be a ton of parts to be had for these.

Guy up the road had a bunch of those ole ford tandems, he ran a trucking business, dumps and dump trailers, 5+4 trans, differential locks, 534's too, some were diesels, larger diesels kind of bypassed those type of trucks, he recently scrapped em all out too, I would have liked to have gotten one for a site truck. It seemed like ford sold a bunch of those, fair amount of em around still, kinda always liked the way they looked, overall not a lot of miles, though gas engines did not last as long then, if it ran good, someone should have found a home for her, they are nice site trucks, I ran one with a detroit and allison automatic on a site job years ago, the dump bed was real fast to raise up, never saw one so quick, small dump bodies compared to heavier tandems, old reyco or similar leaf spring suspensions, still thought they were a real tough truck though, not easy on fuel, but great for a farm.

OT - old grain truck

Well-known Member

Well-known Member

Well-known Member

Well-known Member

Member

Well-known Member

Member

Well-known Member

Well-known Member

Well-known Member

Well-known Member

Well-known Member

Member

Well-known Member

Well-known Member

Well-known Member

Well-known Member

Well-known Member

Well-known Member

Well-known Member

Well-known Member

Well-known Member

Well-known Member

Well-known Member

Well-known Member

Similar threads