Hoping some folks don't mind revisiting this subject. . .
On my 101 tranny the drain plug hole has some buggered threads. To fix the threads I ordered a M22x1.5 tap. When I measured the tap OD the measurement gave 22.2mm. I've measured a couple of drain plugs and measurements cluster around 21.8
The guy at the industrial tool/fastener shop thought the plug and hole might be some obscure European/British straight pipe thread.
I definitely don't want to tap the hole only to discover I've made the problem worse. Any thoughts or comments are appreciated!!!
The SEAL is made by compressing the seal washer (so you don't need to worry about thread leaks), and a tap must be larger than the thread of the intended 'bolt' by a bit - but 0.4 mm sounds way to much! The thread valley to peak of a 1.5mm pitch screw is about 1.3 mm (by this site - https://en.wikipedia.org/wiki/ISO_metric_screw_thread), so that 0.2mm play (each side) is about 1/6th of the thread.
Sounds like it might work, but be very loose!!
Say - did you measure your drain hole?? it should be bigger than the plug's thread diameter minus 2.6 mm by some amount. If that amount bigger is 0.4 mm then you are good to go...
Thought I'd close the loop. Silly me for questioning the earlier posters.
I drilled and tapped a piece of scrap w/ the 22x1.5 tap. Plug fits. Little more slop than ideal but I think quite acceptable.
When chasing the threads on the tranny case could definitely feel the section of damaged thread.
I am reassembling my (first) gearbox. As part of the rebuild I replaced the 3rd gear dog ring. Now the "washer" that was between the 3rd gear synchro hub (aka "tripod") and the circlip is too thick to let the circlip seat fully on the mainshaft, even after fully heating and pressing the...
Probably the best "upgrade' i did to the car, replaced the original 4:56 non LSD. I live in San Diego and spend 1/2 the time on freeway, and its so nice to be tooling at 70 at 3500 rpm. The motor has mild porting on intake and no real performance mods, running SPICA, at first I thought 4:10...
So I am sort of stumped. I have old-style gearbox with grooved/non-moly synchro rings that came out a 74 Spider. So I know that's not right, someone must've swapped the box at some point. It is, however, a hydraulic clutch gearbox.
But here's where I am stumped:
I posted a thread about fixing the famous 'First gear Grunch' a while ago. Just send a PM off to a member that asked about it, and thought some others might be interested.
The issue is that when sitting at idle and not moving, the first gear will grunch when shifting from neutral to 1st. It's...