Humboldt Posted August 13, 2016 Report Share Posted August 13, 2016 I am trying to minimize my under car time reaching down engine bay to replace clutch slave cylinder hose. It feels like a 19mm wants to go on (the rubber hose side that goes to the bracket on the chassis with the metal hose on the other side. THis isn't an SAE fitting--inch-fraction-- is it? Thanks for any info on what I hope is a quick dumb question! Quote Link to comment
datzenmike Posted August 13, 2016 Report Share Posted August 13, 2016 Your profile says 720 so PL510 or the later HL510? Both would be a metric fitting on the hard line side and the matching flex line. Ah I see that they both use the same part The PL/HL510 flex line from Mar '69 is 46212-21000 and about $25 but any flex line that will fit for length will work. I think brake flex lines will work too. 1 Quote Link to comment
Humboldt Posted August 13, 2016 Author Report Share Posted August 13, 2016 Thanks datzenmike I am going to NAPA to pick up flex hose. BTW I tried to update my profile to include the 72 goon I am working on. On the 720 (80 L20B) I recently was dogged by problems with the truck stalling. I replaced fuel filter (under filler pipe in front of rear passenger side door) switched coils, new dizzy cap and rotor . . .nuthin! So I plugged as many vacuum lines to and from the carburetor and voila--it's running like a champ. In Humboldt you only have to smog it once-- at time of purchase. Quote Link to comment
Humboldt Posted August 14, 2016 Author Report Share Posted August 14, 2016 switched it out. 10mm on the metal hose side, 17 on the flex. Had to use a vise grips on the 10-hate doing it- only 2 barked arthritic knuckles out of the deal. That helped my memory. fluid=black. boring stuff compared to a KA swap so I will shut TF up. Hope to fire up this sleeping beauty soon. 1 Quote Link to comment
Stoffregen Motorsports Posted August 14, 2016 Report Share Posted August 14, 2016 Those small metal tube nuts get very hard to loosen. Before I hit them with a vise-grip, I try heating it up with a torch. You don't have to get it very hot (and be careful what else you're aiming the flame at). Hit it with heat for 5-6 seconds and immediately try it with a wrench. If that doesn't work, squirt it with WD40 and walk away. When it cools it will draw the lubricant into the threads making it easier to loosen. No more vise-grip. 1 Quote Link to comment
Trophy24 Posted August 17, 2016 Report Share Posted August 17, 2016 Flame wrench works very well on hard line fittings. Just don't heat up the rubber brake hose too much. They pop in a spectacular way. 1 Quote Link to comment
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