tillotson carb wb10e

tezar1962

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g'day from Australia I've a 1972 Chrysler 105hp 1056HE she been sleeping with the fishes. I've searched the forum and was unable to locate the information I require. how do you take out the idle tube welsch plug the smaller of the two seen in pic 3 and which way does the tube come out, is it pressed out from the bottom of the carb? as you can see the carbs were well encrusted but I think with some time and elbow grease i'll get these two working again. this will be a step by step operation, the crank is seized, pot one looks rusted, original finned voltage regulator has one connection corroded off. magnapower unit looks in good condition although as yet untested it has the two wire dizzy and i'm lead to believe its got the magic eye timing. it has a large capacitor mounted behind the wiring connector bank that I have not been able to find any reference to on the forum. this will be a big job to get this old yank cranking again but they were built to last in those days so i'm not flogging a dead horse. most essential oem parts are now obsolete so im aiming at refurbishing the damaged parts but may have to source suitable replacements where needed. any help with these carbs will be much appreciated.
 

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Frank Acampora

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I hate to be a naysayer but if that engine has been under water for any length of time it is going to be a massive job to restore it. Are you sure you want to get into it?

At any rate, the two wire distributor is indeed an electric eye. If the regulator is the red finned type, it is a rectifier only.It needs a "trip regulator" to maintain a steady voltage. The trip regulator is a rectangular box with a mounting ear and a transistor showing on the top. It mounts to an exhaust cover bolt. The distributor will in all likelihood need a new set of bearings for the shutter/rotor shaft. The capacitor was used on some older models and not others. I think that by the late 1970s this capacitor was no longer used and with the Magna power ignition it probably is not necessary. I suspect it was used for noise suppression.

The welsh plug is pushed out the top of the carb along with the idle tube. It is a good bet that the idle tube will be damaged and you may need a carb rebuild kit.

If the crank is pitted or damaged in any way it is not usable and must be replaced.

All in all, this is one engine to scrap--sorry! Try finding a newer block to mount on the leg.
 

tezar1962

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thankyou frank, I was hoping to hear from you as I have noticed you are the absolute authority on these motors. I got this motor on a 15 foot unidentified fiberglass hull and single axle galv trailer for $80 AU. i'll still persevere with it without investing too much money as at the moment I've plenty of spare time and a rebuild project seems attractive. I think the voltage regulator is all black and is round with fins! I tested the prestolite starter motor and it ran weak so I dismantled it and the original 4 brush holder plate fell apart, I will attempt to fashion a replacement out of old circuit board to replace it with, i'm surprised it even turned as it has all been submerged in salt water! I checked the tilt and trim motor and it works both rams lift and the centre hexagonal trim ram works. so far I am confident in saying "these 70's motors were built to last"
 

Frank Acampora

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Yes, the black finned unit is a Motorola rectifier/regulator. Unfortunately they are potted and not repairable. Keep us informed as to your progress.
 

tezar1962

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photo224519.jpg photo224519.jpg I have managed to unscrew the main jet after cutting off the idle jet, i'll need a press to push the remnants of the idle tube out the top of the carb body and hopefully reuse the welch cup. I have found tube 2.35mm (or 0.092inches) in diameter from a hobby store is the original copper or brass? and does anybody know what the inside diameter should be?
 

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tezar1962

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photo224523.jpg photo224524.jpg photo224523.jpg I think I have all the channels clear. the hole inside the throat is open to the cavity around the main jet, I figure as its in the throat air must be pushed in when the motor is running helping to push fuel up the main jet and into the throat, and when the choke is closed it sucks. the three idle jets come in from the top of the carb the butterfly is one piece and has a cut out across the top, when the throttle butterfly is closed these three jets supply the fuel feed from the idle tube that runs through the middle of the main jet.
 
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tezar1962

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I've made an error (had my beer goggles on that day) its the 1 wire points distributor. the rotor was seized but some wd40 and rotating back and forth free'd it up although it feels rough i'm thinking of just greasing it up and and see what happens. can you test the cdi unit and coil by connecting 12v and manually spinning the dizzy?
 

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tezar1962

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I've done all I can with the carbs, I used a small screw to remove the small welsch plugs without damaging them and drove a pin in from the top to push out the idle tubes. the main jets were destroyed while removing them with an easyout, I now have to source replacements. i'm new to this forum so should I start a new thread for the electricals?
 

Frank Acampora

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Yes, as long as everything is connected you can power the CD unit with 12 volts by jumping the engine terminal. spinning the distributor (assuming points are cleaned and set to .010 should induce a spark.

Don't do the distributor half fast If it spins rough that means the bearings are bad. Remove the top pulley and press out the shaft. Be careful because the rotor is glued to the shaft. Remove the upper and lower bearings and replace them. They are standard and relatively cheap so take them to your local bearing supplier to match them.

As far as replacement high speed dip tubes, WB carbs acme with slip in and screw in types. Slip in were held in place with a spring above the bowl not. If you can find a couple of junker carbs with good tubes try using them.

I still think you are beating a dead horse. Before you do all the accessory work, disassemble the engine block and see if it is at all usable.
 
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