stripped threads - carb fuel line help

[dkcrew]

I'm looking for any recommendations on ways to address a fuel leak going into the carb. The threads on the inside of the carb are stripped so the bolt won't tighten enough without leaking fuel. This carb has been going on/off/on/off/on/off trying to track down and fix a vacuum leak at the base. I finally got a new base ... and now this ... I must have over-tightened the last install because this time it barely took anything and spun

Thanks -- Dave

 

[charliemeyer007]

You need to install a bushing and then drill/tap back to the factory threads. Metal filled epoxy will work for a while.

 

[dkcrew]

Is that bolt an M11 x 1.5? I would like to helicoil but it's a banjo bolt so not sure if the insert will interfere with the hole or not?

 

[charliemeyer007]

A helicoil could work. Me, I would tap the hole for 1/8 or 1/4 NPT because I have the taps and drills. Screw in a brass 90 with a barb fitting and change the steel line to fuel hose.
If it would clear as one piece - or you assemble the fitting

https://www.amazon.com/uxcell-Fitting-Degree-Adapter-Connector/dp/B07PDXSPWC?th=1

 

[B y r o n]

Carbs generally have thin walls so not sure if there will be enough meat for helicoil. Might be time for a new carb or donor carb to replace bad parts.

 

[rainingagain]

Is that bolt an M11 x 1.5? I would like to helicoil but it's a banjo bolt so not sure if the insert will interfere with the hole or not?

Carbs generally have thin walls so not sure if there will be enough meat for helicoil. Might be time for a new carb or donor carb to replace bad parts.

That is some soft metal. You might be able to get away with a helicoil or a timecert but there isn't much meat there as noted by @B y r o n . If I was going to attempt this, I would us a very, very steady drill press. You are only going to get one shot at centering the hole.

 

[Pighead]

I used this...

 

[Paul_A]

Those are usually a soft alloy that take no abuse. I think as a last chance I would try CharlieMeyer007's idea of up sizing the next diameter with a very similar thread count, even if it's not metric, understanding that you are on the fast track to a new carb part. Metal infused epoxy might do it for a while, or maybe a fuel resistant thread tape?

 

[1969FJ]

Timeserts are superior and work incredibly well. Helicoils are also great and is subjective to the user.

++ TIME-SERT Official Threaded inserts for stripped threads, blown out sparkplugs,

threaded inserts threaded, stripped threads, threaded inserts, blown out sparkplugs, stripped threads, stripped out theads, inserts threaded inserts, ford sparkplug repair, threaded insert thread repair spark plug ford blown, blew out ford sparkplug, stripped theads, threads stripped out...

www.timesert.com

 

[charliemeyer007]

I agree time-serts would be a better choice $150 to do one/5 hole

M11x1.25 KIT

First time repair. Kit includes: Drill, counterbore, tap, install driver and 5 inserts 22mm length. Note: Not for deep head bolts see P/n 11125 universal M11x1.25 head bolt kit Other M11x1.25 length inserts here need a tap guide?

time-serts.com

 

[roadstr6]

Check your sealing washer fitment on that banjo bolt. There should be one copper (or aluminum) washer on the bottom of the banjo and one on the top. Looks like you might have two on top and none on the bottom. That's not going to fix your thread debacle, but it may help once you've figured that part out. Have you tried a couple of wraps of fuel resistant teflon tape to seal that bolt? It might work. Janky fix, but it could work.

 

[45Dougal]

When you screw something onto that repaired hole, I'd make it the very last time.

Unless you want to risk torquing that banjo bolt multiple times, I'd consider finding or making an extension piece which can screw (or even bond) permanently into the carb, and can receive the banjo bolt many times over.

 

[timmyisinthewell]

I'd be looking for a another top to that carb from one of a number of reputable and knowledgeable vendors here on the forum. Having a gasoline leak (with associated vapor fumes) in a running engine compartment with moving electrical components (distributor, starter motor, generator) is a risk I'm not willing to take. AGAIN. Ask me how I know. Fix it right because as they say, there are only two ways to complete the task. Right or again.

 

[dkcrew]

thanks all. I have an old partial carb coming from which I will try to reuse the top - thanks @mattressking! And yes I agree @45Dougal on the removal. I'll keep that in place. In retrospect I should have been loosening the bolt holding the fuel line and kept the banjo intact. live and learn. I do have the small washer that sits in the insert of the female threads and then another on top. I kept looking at the top because the bolt head isn't flat where the bolt meets the head. So it appears there are 2 washers but the top one is part of the bolt itself.

Either way, I'll try the new carb top and I'll probably try to timesert the existing to see and have it as a spare ... parts coming ... so now I wait ... THANKS all. I'm itching to get this thing running again.