exit64 Posted July 9, 2011 Report Share Posted July 9, 2011 I just met up with Skib and Alicia a few minutes ago here in Hood River. They pulled into the parking lot at Safeway and the Roadster is stuck in 4th gear. The clutch is working fine as I can engage it and start the car. I tried to bump it out, yank hard, a few different combinations of cuss words, nothing. Any ideas? They continued on their journey and now the 70 is back in the garage next to the 69 2000. Maybe she was just home sick. I need to sort this out ASAP as Skib is selling his 620 this weekend and the 1600 is their only car after that. Let's hear some ideas from the tranny experts. Thanks, Mike aka exit64 Quote Link to comment
datto510 Posted July 9, 2011 Report Share Posted July 9, 2011 Sounds like a bent shift fork. Quote Link to comment
datzenmike Posted July 9, 2011 Report Share Posted July 9, 2011 Ouch! Does that 4 speed have the removable bottom plate on it? Like the 510 4 speed??? If so, try draining the oil and removing the pan. You may be able to reach up the pass side and push the fork closest to the front to the rear and get it out of forth. Quote Link to comment
exit64 Posted July 9, 2011 Author Report Share Posted July 9, 2011 Mike, It does have the removable plate. I am going to open it up at some point today and see what goes. Skib said it made zero funny noises and was shifting perfectly up until this happened. I had this car for 6 years and it never missed a beat. Worst case scenario I can have another 70 tranny here by next weekend and then do a "Canby style" swap party over at the garage, so don't plan anything for next weekend. :cool: Quote Link to comment
datzenmike Posted July 9, 2011 Report Share Posted July 9, 2011 I don't know the Roadster 4 speed very well, or at all really. Shure looks like an F4W63 from a 510 but longer like the one in the 610. .... but with the starter on the other side. . Quote Link to comment
exit64 Posted July 9, 2011 Author Report Share Posted July 9, 2011 Pretty much the same guts, with the starter on the other side. That is exactly how it is described in "The Roadster Book". I think I am just going to swap it out next week unless it is totally obvious when I pull the inspection cover. Quote Link to comment
datzenmike Posted July 9, 2011 Report Share Posted July 9, 2011 Check the oil level first. A dry tranny will seize and this could be what happened. I also had an F4W63 (521) seize in forth with no reason. I never checked the oil but it was quiet and I had been on the highway and went to downshift. Quote Link to comment
Dime Dave Posted July 9, 2011 Report Share Posted July 9, 2011 From my experiance it is likely the coupling ring has moved to far when engaging 4th gear and the centering rockers in the hub that the coupling ring rides on have popped up behind the coupling ring keeping it from disengaging 4th gear. The coupler rides on a grooved hub. When 3rd or 4th is not engaged the coupling ring is cerntered over the hub. The centering rockers keep the coupling ring in that neutral position when 3rd or 4th are not engaged. When you engage 4th the coupling ring is pushed off center of the hub by the shift fork, over the syncro ring and engages the teeth on 4th gear. The coupling ring engages the hub thru its grooves to the teeth on the gear to engage the gear. The fix is new parts. The alternate is to place stops that keep the fork from pushing the coupling ring too far. This is only a stop gap measure as the wear is still present and should all the "slop" stack in one direction, the coupling ring can still over travel and lock into gear. I've had more than one 63 series gearbox do this and no amount of pulling on the shift lever will dissengage the coupler. Quote Link to comment
datzenmike Posted July 9, 2011 Report Share Posted July 9, 2011 These are 71B type but others probably similar. . Quote Link to comment
Dime Dave Posted July 10, 2011 Report Share Posted July 10, 2011 Yup, pretty much the same design. Quote Link to comment
Jayden71 Posted July 10, 2011 Report Share Posted July 10, 2011 I have had this happen to my 521 4 spd before. There is a thread on here about how to fix it, temporarily. I will look and see if I can find it. Quote Link to comment
datzenmike Posted July 10, 2011 Report Share Posted July 10, 2011 I'd be interested in that. As stated mine stayed in 4th out on the highway, no warning, no sounds, nothing to make me wonder if I did anything wrong with it. This was like over 30 years ago and I may not have maintained my 'stuff' as well as I should have. :o Quote Link to comment
exit64 Posted July 11, 2011 Author Report Share Posted July 11, 2011 Alrighty then, it's now out of 4th gear. Found the problem. One of the half teeth that the block goes through is missing and the block slipped over to the side a bit. Gave it a poke with my pocket knife and now shifts smooth as butter again. Who knows where the rest of that gear tooth went as it is not in the pan or stuck to the magnet. The rest of the gears and synchros are in perfect condition. I am going to make a pan gasket tomorrow morning and see what happens. Quote Link to comment
datzenmike Posted July 11, 2011 Report Share Posted July 11, 2011 Mike that tranny has the same ratios as the 510 sedan, that can't be coincidence, they must be internally very similar. So no shortage of doner parts Quote Link to comment
Guest kamakazi620 Posted July 11, 2011 Report Share Posted July 11, 2011 So no shortage of doner parts I beg to differ i scrap/junk those ALOT Quote Link to comment
datzenmike Posted July 11, 2011 Report Share Posted July 11, 2011 Well if you scrap A LOT of them save mike one for parts. :lol: :lol: :lol: :lol: :lol: Quote Link to comment
MicroMachinery Posted July 11, 2011 Report Share Posted July 11, 2011 ... I tried to bump it out, yank hard, a few different combinations of cuss words, nothing. That's what SHE said!! Quote Link to comment
Guest kamakazi620 Posted July 11, 2011 Report Share Posted July 11, 2011 Well if you scrap A LOT of them save mike one for parts. :lol: :lol: :lol: :lol: :lol: Trade for Dogleg????????? :blink: :lol: :lol: :lol: :o :lol: :lol: :o :lol: :lol: :lol: Quote Link to comment
datzenmike Posted July 11, 2011 Report Share Posted July 11, 2011 :lol: :lol: :lol: :lol: wait!!!... no. :lol: :lol: :lol: :lol: Quote Link to comment
exit64 Posted July 11, 2011 Author Report Share Posted July 11, 2011 Haha Micro, good one. Watch The Office much? :lol: Quote Link to comment
Wide14u Posted July 11, 2011 Report Share Posted July 11, 2011 right on getting it out of fourth Quote Link to comment
skyknight789990 Posted August 8, 2011 Report Share Posted August 8, 2011 sounds like someone got this figured out my 79 620 did the same thing today but i am stuck in 3rd can anyone help me Quote Link to comment
Skib Posted August 8, 2011 Report Share Posted August 8, 2011 sounds like someone got this figured out my 79 620 did the same thing today but i am stuck in 3rd can anyone help me heres what happened. theres this block and 2 half teeth. and they should look like this. heres the 4th gear block on mine. everything shifts perfect, rest of the trans is suuuuuper clean. but that one missing half tooth keeps it in 4th Quote Link to comment
skyknight789990 Posted August 8, 2011 Report Share Posted August 8, 2011 heres what happened. theres this block and 2 half teeth. and they should look like this. heres the 4th gear block on mine. everything shifts perfect, rest of the trans is suuuuuper clean. but that one missing half tooth keeps it in 4th ok thanks do i have to drop the tranny to get to the space to check this ? Quote Link to comment
Skib Posted August 8, 2011 Report Share Posted August 8, 2011 ok thanks do i have to drop the tranny to get to the space to check this ? with your trans, ya. your going to have to drop the trans and pull it apart to see the gears. Quote Link to comment
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