Porsche 356 Ring And Pinion Setup & Final Assembly
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- Опубликовано: 15 сен 2024
- My 741 transmission is now assembled by me, a first time builder. All measurements have been checked and double checked so fingers crossed it runs well on the road.
I may do one more consolidated video once the car drives, but this completes the transmission build series. Thanks for being here.
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Ahhh, the simplicity of gearbox overhauls. During the years I raced my Lotus 61 formula Ford, I also built gearboxes for fellow competitors. Most common was replacing the original Hewland gearbox case (type 1 VW case) with the VW "Rhino" case. It could easily handle over 200hp developed by the Lotus twin cam/Cosworth BD series engines. The first Rhino case I did, I wrote down all the setup specs for my milling machine, and afterward could machine a Rhino case into a Hewland "Mark series" case in a couple hours. Rather than spend thousands for all the authorized Hewland tools used in setup, I made my own. I used an old Mark series case with the side cut out to set up the bearing carrier (what you call the intermediate plate). I had 27 Hewland gearsets, so I set up my box uniquely for every track. (I could do a gear change in 20 minutes). In a perfect world, 1st gear was set for the slowest corner, and 4th gear to redline a couple hundred yards before the brake point on the longest straight. 1,000 rpm drop 1st to 2nd, 750 rpm drop 2nd to 3rd and 500 rpm drop 3rd to 4th. (1st gear for Sears Point was a stump puller, and 1st gear for Willow Springs... the car would do 83 mph in 1st gear).
Once you know WHAT you're adjusting regarding pinion end play/backlash, and the other critical measurements, gearboxes are really simple things. Knowing what you're setting up with the bearing carrier, my boxes would shift like drawing a steak knife thru warm butter. I made lots of $$$ on the side for something really simple. BTW, I liked your homemade tolerance tools!!
Thank you for sharing your experience and history. Wow 27 gear sets!
I tend to agree that these gearboxes are simple devices. So many are afraid of them, but once you have the right tools they are fun to work on.
I bet you have lots of great track stories😀
That was a lot of work. No wonder it is expensive to have them rebuilt. Nice job explaining everything that went into getting it right.
I agree. Pay your mechanic well! They have done years of research so you don't have to🙂
Whew, that's got to feel good having that done. Well done, great series.
Whew is right! Difficult job.
Hi Tom, I know it's been ten months on this video, I viewed it many times especially the part where you install the nose cone since I am about to do that, the hockey stick has to fit in the gear selectors, do all 3 pieces have to be aligned in the neutral position so I can insert the thing in. hope I'm explaining it right.
Yes, I would put the transmission in neutral. All three selectors in the same plane.
Then put the hockey stick ball in the middle and try to get the nose cone on without it slipping out.
When you twist the hockey stick rod you should feel it stop in both cw and ccw directions. It only pivots 5-15 degrees or so. I'm guessing in that one.
Got it, will do my best since I'm doing this on my back looking up on one side. I figure it'll be in place if the screw hole where the shift coupler connects points down. @@GarageTimeAutoResto
Got the nose cone in today, I wanted to jack up the tranny to at least get the two cradle bolts in but after moving it so much, it got pushed forward too much, so now I need to raise the front so I can tilt it back and push it back to get the hoop in front of the bolt holes in the car body, I may need to get another jack underneath and put it in the front in order to raise the tranny. It's getting there, but an unforeseen problem always comes up now and then. And can't finish this work till the new mounts come in.
@victorspadoni744 sounds about right, keep it up though
Question
I have a 356A and it’s popping out of gear and ideas
I would double check the linkage.
To test find a downhill road with no traffic. Put the car in the gear it pops out of (I'm guessing 2nd or 3rd). Then disconnect the linkage at the pinch bolt from the trans.
Start slowly in second or third going downhill preferably. Drive it in a way that usually pops out of gear.
If it still pops out then the problem is internal to the trans.
If not then rebuild all linkage pivots and then readjust.
Hey Tom- I just noticed some aftermarket 356 Drop Spindles on Craigslist for $300. Not sure if you’re in the market. Currently in the parts for sale section of the North Bay Craigslist. “Porsche 356 Drop Spindles” . No affiliation
Just thought that maybe you might be interested.
Awesome! Unfortunately I'm looking for dropped 911 spindles, but not 356 (original height)
Way to go.. I have a 72t with rice crispness between 2 and 3rd... not looking forward to this ... another tedious sequence requiring all of my attention and limited smarts..
I'm right there with you. Will be working on my 915 in a month or two. Pops out of third gear.
Is it me- or does it seem that 356s are much more complicated than the 901 cars….🤔
I agree that 356 is more complex. 1) The trans is part of the suspension
2). Trans oil goes all the way out to the wheel hubs to lube the bearings.
3) 356 has front and rear rubber mounts.
That's only the trans, the rest of the car is way more complicated!
@@GarageTimeAutoResto Hey Tom, Thank you so much for this project. I would not have opened up my 741/2 without having your videos available all the time throughout the process. One question regarding the transmission oil lubricating the wheel bearings. Do you think that lowering the car by changing the position of the radius arm would cause the risk of the outer bearings running dry...?
Would it be possible to fill in a little bit more oil to compensate...?
BTW I found a backwards installed roller bearing on the pinion shaft. The transmission was in very good condition but I had to take the whole pinion shaft apart to switch that bearing around.
Greetings from Germany