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Everything posted by JBNeal
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An old broom handle or plunger handle might work as an alignment dowel in a pinch, might need to be turned down a bit... additional information - throwout bearing installation
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Stromberg BXV-3 Rebuild Questions
JBNeal replied to billrigsby's topic in Mopar Flathead Truck Forum
Stromberg made a durable carburetor for many years, but they are not indestructible...whenever I resurrect a carb, I take care not to get too aggressive with the castings, using HF brass bristle brushes, small screwdrivers and dental picks to abrade, stiff wire to clean out passages, and sandpaper on flat glass to true up mounting flanges, all by hand (and by ear). The only plugs I remove are for any check balls, cuz those passages get gummed up. Without the proper tool for removal, the main jet can easily be damaged, and sourcing a replacement is a waste of time without that tool. I usually clean a carb in stages: scrape crud after disassembly; chemical clean soaking for a few hours; cleaning with finer tools; true up flanges; chemical rinsing with carb or brake cleaner; final inspection with a small bright light to check passages and cavities for any missed spots; assembly with new parts. And with all of this work, there is no guarantee that the carb will run flawlessly as a fouled or eroded jet or passage can cause performance issues...fought with those on many occasions before moving on to other carburetors that responded more positively to rejuvenation efforts...had a Carter and a Stromberg both give me problems with leaks and stalling before replacing with carbs that worked waaay better after cleaning up...both cases I think were victims of worn jets, but had no way to measure so back on the shelf they went, monuments to hard work and attention to detail with unacceptable results -
New brake lines-routing questions
JBNeal replied to David Tweet's topic in Mopar Flathead Truck Forum
additional information - brake line routing -
The last 3 neighbors that I've done light upgrades for, the very next thing that was noticed was how much cleaning was needed and that the areas needed new paint...that's when I'd agree while walking out the door
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that looks like that would work ?
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51 B3B build thread - after all these years
JBNeal replied to bkahler's topic in Mopar Flathead Truck Forum
Exactamundo...just takes less work to make and slightly less flow restriction from less tube turning...proximity to the driveline is a tad closer but still practically as safe as the filter...not worth swapping out for now as it should work fine -
I recommend extracting that cam and having it magnafluxed for cracks, as well as sourcing a replacement...a problem this early in the process is a lot easier to deal with than after the whole kit and kaboodle is put back together...
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Small drip at new rear main seal- have it replaced, or wait?
JBNeal replied to '41 Fat Bottom Girl's topic in P15-D24 Forum
I do not want to lecture about multi-viscosity oil characteristics or definitions, but ya might want to study up on the subject a little bit...the flathead was designed to run on SAE 30, so SAE 40 is a little thicker than that original design allowed. Multi-viscosity oils do not thin out with heat as straight weight oils do, so it kinda sounds like them machinists might need to get their facts straight...10W-30 should not be too thin for a flathead, but should flow better than SAE 30 as ambient air temperatures drop below 50°F... FWIW I recently crossed 5 counties to take a gander at a used diesel tractor for my neighbor, and found a few things that the green tractor sales gal neglected to mention when he called about it...dropped her jaw when I was able to kill the battery during a 15 minute operation test, which gave us some leverage when I pointed out the engine oil leak. So the dealer agreed to put some green tractor mechanics on that red tractor to incentivize the sale, and they were able to correct the charging system problem but guessed that the oil leak was the oil pan gasket...that's a 3 day job that requires splitting the tractor (quoted as $3k repair bill) as that diesel engine oil pan is actually a casting that holds the front axle and transmission together...calling a red tractor mechanic, he pointed out that engine has a valve cover breather, that when clogged, would slightly pressurize the crankcase, causing oil to seep out of the crankshaft front seal, which was exactly what I was seeing (a 30 minute cleaning repair). There was a drip on the oilpan, but no oil streaming underneath the tractor; there was caked on oil-soaked dust all under the crank pulley, but no oil slung onto any adjacent parts; and the engine and underhood only had dust on them...all signs that oil leak was very slow and not catastrophic. So back to my original opinion, if ya run the recommended oil viscosity, and keep the crankcase vented (or upgrade to PCV over the draft tube), then that oil leak may not be worth repairing when compared to just cleaning up after the leak and keeping the oil level topped off on a regular basis... -
51 B3B build thread - after all these years
JBNeal replied to bkahler's topic in Mopar Flathead Truck Forum
If ya ever have a problem with that line between the tank and pump filter, make the replacement with 2 bends instead of 3 ? -
additional information - brake cylinder restoration
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Maybe check that wire that goes from coil to distributor ground, easy enough to replace with a fresh conductor...also, I have found that as battery cables age, outward appearance may be OK but corrosion will form between the conductors inside the insulation, driving impedance sky high especially with heat soaking...if replacing that ground cable, a performance upgrade is replacing a starter bolt with a stud, then routing the ground cable to that stud. Another area of interest is any excessive play in the distributor shaft could affect ignition timing, as that shaft would be kinda bouncing around instead of rotating accurately...I'm assuming that the ignition coil is new and matched with the pertronix unit...
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51 B3B build thread - after all these years
JBNeal replied to bkahler's topic in Mopar Flathead Truck Forum
additional information - steering column clamp bushing -
Pistons, Rods and Crank and Camshafts
JBNeal replied to billrigsby's topic in Mopar Flathead Truck Forum
Timing chain and sprockets need to be replaced as a set; also, chain oiler needs to be cleaned and re-installed... additional information - engine rebuilding -
I don't want to sound like a broken record but... If you are concerned with vibration then you need to replace all of the rubber mounts for the engine, transmission and cab, especially if their age is unknown...there are ways to quantify rubber hardness, but I found that I should be able to press my thumbnail into the rubber to distort its surface on isolation bushings such as a motor mount...if I can't do that, then the rubber has hardened and is in a state of degradation, requiring replacement. When I replaced the 55yr old motor, transmission and cab mounts on the '49, it helped dampen vibration significantly. Transmission mounts were replaced by supporting the transmission and removing the mount brackets from the bell housing when more clearance was needed to remove the old rubber. Old rubber was pancaked, hard as chinese calculus, and transferred carbon whenever I held them. But it still had a small vibration going over 50mph, which I attributed to being a 1-ton work truck over 55 yrs old with an engine that probably not perfectly balanced, and the vibration did not change after 10k miles. So I figured that was part of that old beast's character, it's way of hollering at me WHARS THE FIRE
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I've been using John Deere Corn Head Grease for years on gearboxes that were cleaned up and re-sealed, and gears turn VERY smoothly...what little grease that seeps out attracts dust, which purty much cakes over that little leak. For best results, fill gearbox as full as possible to displace air and moisture, working gears back and forth to get the grease to settle and flow through the gears and into the bearings
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If your tank is out, stand it up so that the majority of the pickup tube is vertical, then fill that tube with diesel, acetone, lacquer thinner, carburetor cleaner, brake cleaner, any strong solvent should work...for best results, plug the bung so the solvent cannot flash off right away...might need more than one application...stiff wire to snake it out afterwards, chase that with some compressed air, rinse out with diesel, might not hurt to plug bung then fill tank with diesel to submerge that pickup line for a few days...if ya could introduce some vibration into that pickup line, that might help shake the crud loose
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51 B3B build thread - after all these years
JBNeal replied to bkahler's topic in Mopar Flathead Truck Forum
The link ya posted to one of my build threads was helpful, and the subsequent post by Davin shows the seal and pinion that it fits onto. Also in that build thread post is a link to the original sleeve repair assembly, showing the depth of the sleeve counterbore. I'm a little fuzzy on the details as the parts manual doesn't have much detail in the pinion area in the exploded view, but there are differences among the transmission speedometer pinions as well as orientation on the transmission...the 3 speeds have the pinion parallel to the axles, so gear oil wants to leak out; the 4 speed has the pinion at an upwards angle so that gear oil drains back into the case. Your pinion looks like it has an o-ring groove, but I don't reckon that would work in this application. I found no seal on my 4 speed when I rejuvenated it, and after 10k miles, enough gear oil seeped out onto the sleeve to attract enough dust to clog that seep up. So my suggestion is to install the pinion and sleeve into the transmission with some teflon tape on all the threads, screw on your speedo cable hand tight + 1/8 turn, and roll on -
Carburetor / Pump / Filter Questions
JBNeal replied to billrigsby's topic in Mopar Flathead Truck Forum
if you need a rebuild kit, I believe that there are several sources to choose from on the Links Directory... I sourced several NOS rebuild kits cheaply off of eBay years ago, with the only special treatment I made was to soak any leather parts in Marvel Mystery Oil for a couple of days...didn't have any problems with that, but I reckon I just got lucky as those kits were decades old but still sealed in their near mint packaging. Instructions were included with those kits, though I've briefly looked at some YouTube videos well after the fact that seemed helpful. -
Yep, calibration of your truck gauges can be approximated with an independent gauge to determine variance...did this with my '48 and '49 with an oil psi gauge that i scored from Western Auto before they closed down, the '49 was 5psi lower so I massaged the gauge to be closer to the others...typically a problem with your oil pressure relief spring would be that the valve gets stuck, allowing oil pressure to drop to about 5psi at 40mph...if the pump was bad, you could either have varying pressure readings or a null reading...
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Braze it back in place and you're golden
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additional information - parking lot steering
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10 years? Assume every piece of rubber that contacts gasoline will need replacement, from the fuel tank to the carburetor jet...
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Priming just means to remove air from system and fill with fuel, so the glass bowls need to be filled for sure, as well as the carburetor (additional information - carb filling trick)...the fuel lines can then be purged by cranking on the starter...don't be surprised if you need to fill the bowls and carb up more than once
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51 B3B build thread - after all these years
JBNeal replied to bkahler's topic in Mopar Flathead Truck Forum
My experience has been that rubber gaskets need to be slightly undersized on interior perimeter and slightly oversized on exterior perimeter to establish a fluid- or gas-tight seal so that the rubber is forced into any mating surface irregularities, otherwise the rubber just flops around enough to allow leaks...after learning the hard way, I use an appropriate sealant on rubber to fill in those really small gaps like those 3M products, following the application instructions to the letter, and have not seen a leak since...haven't done anything as big as a windshield, but I've done sight glasses on reservoir tanks, replaced some flat glass on DoD projects, and replaced glass on heavy equipment instrumentation that is exposed to the elements year-round, so far nobody's cussed at my workmanship -
additional information - toe board sealing additional information - floorboard bolt alternative