Holbert 928 with serious brake/clutch pedal assembly problem
#46
Rennlist Member
Thread Starter
thats right, you have all that stuff all prettied up! how do you press them in?
with a press? or can you press them in with some type of home made fixture.
Im just hoping that they didnt carve out the clutch pedal to fit that plastic bushing.
mk
with a press? or can you press them in with some type of home made fixture.
Im just hoping that they didnt carve out the clutch pedal to fit that plastic bushing.
mk
#47
Under the Lift
Lifetime Rennlist
Member
Lifetime Rennlist
Member
You could try a C-clamp or a vice as an alternative to a press. Often works fine for bearings and bushings. And, if they are too snug to push in easily, heat the pedal and freeze the bearing.
#48
Rennlist Member
Thread Starter
thanks bill. I'll know in 24hours what im goin to be looking at. Hey, it could be a good thing that i tackled this project. If it works, it will be nice to have some real solid pedal function.
mk
mk
#49
I used a 12 ton press in my garage with VERY LIGHT PRESSURE. I also did the standard oven/freezer deal with the bearing in the freezer, and the pedal in the oven. Its makes life easier, if not... warmer.
#51
What delrin tube are you talking about? The clutch is on bearings and the brake is bushings that I recall.
#52
Rennlist Member
Thread Starter
if you look at the pics above, you can see that porsche, when they did the the holbert car, used a white plastic tube (bushing), it spans the entire length of the clutch hole end to end. its not a very tight fit, but it does provide some bearing function. ironically, its not where the looseness was coming from. that was how the shaft was moving in the mounting hole inside its end flange.
mk
mk
#53
Wonders never cease with that car Mark. The bearings will give you a nice direct feel. I actually went to far as to have brass bushings made for the brake connector block to replace the plastic ones. You should check all that maybe, and see if there are other places you can firm up.
How will you fix the damage to the frame thats attached to the car?
How will you fix the damage to the frame thats attached to the car?
#54
Rennlist Member
Thread Starter
Yes, this car has been full of surprises.
as far as the brakets that attach to the chassis, i think that side is ok. its not jimmied up that much, as the shaft was moving inside of the "end cap" and not the endcap moving in side of the frame. Im hoping that the new shaft that is now one piece will fit right in and the "D" part will fit in the mating area and not move. again, look at the pics. the rounded out hole is the shaft moving inside of the end washer or end cap. so, i might get lucky. im hoping.
Mk
as far as the brakets that attach to the chassis, i think that side is ok. its not jimmied up that much, as the shaft was moving inside of the "end cap" and not the endcap moving in side of the frame. Im hoping that the new shaft that is now one piece will fit right in and the "D" part will fit in the mating area and not move. again, look at the pics. the rounded out hole is the shaft moving inside of the end washer or end cap. so, i might get lucky. im hoping.
Mk
Wonders never cease with that car Mark. The bearings will give you a nice direct feel. I actually went to far as to have brass bushings made for the brake connector block to replace the plastic ones. You should check all that maybe, and see if there are other places you can firm up.
How will you fix the damage to the frame thats attached to the car?
How will you fix the damage to the frame thats attached to the car?
#55
Rennlist Member
Thread Starter
928 delivers right on schedule!! These guys are amazing. Its funny, i just expect things to show up in 2 days, and when this shaft was ordered from Germany, and they quoted 2.5 weeks, i marked it on my calendar. I was hoping for 2.5 weeks but was thinking these things usually take 3-4.
I was just looking at my reminder this morning for the 2.5 week estimation, and the door bell rang......UPS.
Thanks Jim and Tom!
Anyway, the part is Totally different than i expected. it is a solid shaft from end to end. I dont know how mine broke or when it broke, but its BROKE! So, the needle bearings fit (press fit ) right in the clutch pedal . (just tapped them in with a hammer) . the plastic bushings are new and the shaft goes through all components effortlessly. to think i was on my back with this one for hours, when all i needed was some new stuff!
I dont think it will be any prob to get this stuff back in . should be nice to have the factory new pedal feel, without all the movement, squeaks, racket!!!
Thanks for the help everyone!
Mk
I was just looking at my reminder this morning for the 2.5 week estimation, and the door bell rang......UPS.
Thanks Jim and Tom!
Anyway, the part is Totally different than i expected. it is a solid shaft from end to end. I dont know how mine broke or when it broke, but its BROKE! So, the needle bearings fit (press fit ) right in the clutch pedal . (just tapped them in with a hammer) . the plastic bushings are new and the shaft goes through all components effortlessly. to think i was on my back with this one for hours, when all i needed was some new stuff!
I dont think it will be any prob to get this stuff back in . should be nice to have the factory new pedal feel, without all the movement, squeaks, racket!!!
Thanks for the help everyone!
Mk
#56
Rennlist Member
Thread Starter
Its all together!! pretty easy, aside from working on your back, a little upsidedown.
The needle bearings really firm things up, and the pedals feel like a new car.
Thanks for all the help, and thanks again 928intl for the advice and quick delivery of the special order parts. i never would have ordered those needle bearings, and they did go right in.
I did just remember that i forgot to attach the little hanging spring to the brake pedal. Ill have to remember to do that later before it falls off and i forget where it goes. I guess it basically pulls the brake peda back slightly.
It went together real fast and the structure holes were just fine. the new shaft with that "D" end fit right in and is solid as a rock.
Now, off to the tie rod replacement
Mk
The needle bearings really firm things up, and the pedals feel like a new car.
Thanks for all the help, and thanks again 928intl for the advice and quick delivery of the special order parts. i never would have ordered those needle bearings, and they did go right in.
I did just remember that i forgot to attach the little hanging spring to the brake pedal. Ill have to remember to do that later before it falls off and i forget where it goes. I guess it basically pulls the brake peda back slightly.
It went together real fast and the structure holes were just fine. the new shaft with that "D" end fit right in and is solid as a rock.
Now, off to the tie rod replacement
Mk
#57
Rennlist Member
Thread Starter
Again, that shaft and its end is solid as a rock. Its basically, one piece of steel. all the movement should be on the pedals and bearings (plastic or needle)
mine must have torqued off the end, as it was rotating and grinded away at what was left, however, it still was attached, so the shaft was not endanger of backing out the reverse way. you see how oval that part is ? thats a lot of wear over the years! now, it is solid with the new shaft. only drawback, is waiting for the part from Germany.
Mk
mine must have torqued off the end, as it was rotating and grinded away at what was left, however, it still was attached, so the shaft was not endanger of backing out the reverse way. you see how oval that part is ? thats a lot of wear over the years! now, it is solid with the new shaft. only drawback, is waiting for the part from Germany.
Mk
Side note: Does anyone have a new one of those shafts and can verify if the head on it spins freely? The one I have in front of me does, as nicely as a roller bearing infact. The question is whether that's intended. Could these shafts be a problem if that head loosens? Is this a possible problem to be checked as a maintenance item on 928s?
#59
Rennlist Member
Thread Starter
You're the best! thanks
hey, what about that little spring. what in the heck is that little tiny tin spring supposed to do? Ill go put it on the brake pedal, but it seems like an afterthought on the design. does it help pull the pedal back when bleeding the fluid??
mk
hey, what about that little spring. what in the heck is that little tiny tin spring supposed to do? Ill go put it on the brake pedal, but it seems like an afterthought on the design. does it help pull the pedal back when bleeding the fluid??
mk