Now I don't want the "15 minute Oil Cooler Seal" Replacement Hoax
I have a grindy going into second gear and that is it. The gates are tight everywhere, linkage is great, bushings seem fine.
How difficult is it to go into the tranny and update some worn bits?
As a frame of reference, I have taken the engine out, did some fuel line and injector stuff, oil cooler seals, valve adjustments, exhaust and heating stuff...minor yet somewhat brave for a newbie.
I have no problems spending cash, but I would love to give this a go if it is do-able.
Please help me decide --> is it something I should do or farm out???
Cheers
T
Very doable as long as you do the research and prepare. I used the bondo's thread in the Classics section and Red-Beard's article (see his website) as a guide.
Get a gear puller or similar press for getting the pinion and drive shafts out of the intermediate plate (I didn't like the technique....but to each his own).
That is not to say, however, that you won't find other problems once you get in there. For example, one of my intermediate plate bearing fell apart once the pinion shaft was removed. I wasn't exactly expecting that.......but then again it was a 30 year old gear box.
The whole process was really cool
good luck and enjoy!
Read red-beard's transmission rebuild article. Seems reasonably straight-forward, but the "while you're in there" parts add up in a huge hurry!
http://home.san.rr.com/pb914/rebuild/
--DD
I agree that Red-Beard's article is excellent. Haynes is also pretty good with the exception of being very vague on setting the shift fork alignments.
One exception to Red-Beard's article though - I would never attempt to do this with the transmission in the car. Remove the transmission first. There are too many potential pitfalls if you don't. Besides, you probably wanted to replace the mainshaft seal anyway.
Demick
Parts do add up in a hurry if they are bad. All 6 bearings will cost close to a grand to replace, but it is rare that more than 3 or 4 of them will need it. But there really isn't much risk in going in there and trying it yourself. If your tranny is totally bagged out, our shop always has rebuilt 914 boxes on the shelf at $1850 w/exchange. If you get in there and there is way too much wrong, you can still send us your core in pieces for exchange. Or, good used boxes are always around on E-bay, here in the classifieds, and places like Parts Heaven for substantially less $$$. So, go for it...
Out of the 3 transmissins I pulled apart one one had both intermediate bearings in useable shape.
2nd gear requires whole gear stack to come out. remember the number of paper shims/gaskets between the intermidiate plate and case.
DON'T TAKE OUT RING GEAR. you only have a 50/50 shot at getting it back in the right direction.
BTW. If you grind going into second, then you have worn the dog teeth. If you just replace the synchro band, your grinding will go away, but you will probably end up with much difficulty getting into second instead. So you probably need to replace the dog teeth and slider for 2nd gear as well. Best thing to do is replace your 2nd/3rd slider with a good 4th/5th slider from a donor transmission as the sliders are big $$. And since your 2nd/3rd gearstack is already apart - definitely replace the 3rd gear synchro as well. I assume you are already doing the 1st gear stuff as that wears the most.
Demick
According to Red Beards article - "All Dogteeth are the same for all gears. All Synchro bands are the same for all gears. So, why do 1st gear dogteeth cost less in the catalog? The dogteeth come with brake bands, the little guys that sit under the circlip. 2nd-5th gears need to be synchronized in both directions (Spinning the gear faster and spinning the gear slower – i.e. up-shifting and downshifting)."
I this accurate - are all dog teeth and syncros are the same ?
Also 5th would not need to be syncronized for up shift - just like 1st not need to sync for downshift - so neither would need two brake bands?
Jim
QUOTE (jimkelly @ Oct 19 2005, 08:11 AM) |
According to Red Beards article - "All Dogteeth are the same for all gears. All Synchro bands are the same for all gears. So, why do 1st gear dogteeth cost less in the catalog? The dogteeth come with brake bands, the little guys that sit under the circlip. 2nd-5th gears need to be synchronized in both directions (Spinning the gear faster and spinning the gear slower – i.e. up-shifting and downshifting)." I this accurate - are all dog teeth and syncros are the same ? Also 5th would not need to be syncronized for up shift - just like 1st not need to sync for downshift - so neither would need two brake bands? Jim |
I just did it two weeks ago. Replace my 1st and 2nd gear synchros. My dogs teeth etc. were still in great shape as I caught it early. I have useless pics on my blog.
Took the tranny out Friday night put it back in Saturday all fixed up.
QUOTE (jimkelly @ Oct 19 2005, 07:11 AM) |
According to Red Beards article - "All Dogteeth are the same for all gears. All Synchro bands are the same for all gears. So, why do 1st gear dogteeth cost less in the catalog? The dogteeth come with brake bands, the little guys that sit under the circlip. 2nd-5th gears need to be synchronized in both directions (Spinning the gear faster and spinning the gear slower – i.e. up-shifting and downshifting)." I this accurate - are all dog teeth and syncros are the same ? Also 5th would not need to be syncronized for up shift - just like 1st not need to sync for downshift - so neither would need two brake bands? Jim |
Sounds good family,
I guess if I screw up, I can always throw money at it!
Please stay tuned for any questions/queries/nightmares!
T
sorry for semi hijack.
when it is said "engineered "eaiser to engage 1st from a stop" with proper 1st gear bits - what does this mean? Is it harder to locate 1st or what - and would using 2/3 or 4/5 dogteeth etc cause premature wear?
Jim
QUOTE (jimkelly @ Oct 19 2005, 09:10 AM) |
sorry for semi hijack. when it is said "engineered "eaiser to engage 1st from a stop" with proper 1st gear bits - what does this mean? Is it harder to locate 1st or what - and would using 2/3 or 4/5 dogteeth etc cause premature wear? Jim |
I have a guy in Toronto who rebuilds them for me, he's been doing Porsche tranny's for 20+years.
I had one (built out of 2 cores, a few new parts and seals) done this year for a customer ..cost me $1800 Canadian.
QUOTE |
One exception to Red-Beard's article though - I would never attempt to do this with the transmission in the car. Remove the transmission first. There are too many potential pitfalls if you don't. Besides, you probably wanted to replace the mainshaft seal anyway. |
I would seriously consider getting a good used tranny and rebuilding that while keeping yours in reserve.
I don't know what - Dr. Evil's (Mike) - schedule is like but he is located in PA (east cost) and rebuilds 914 trannys for about $500 labor + plus parts. My uinderstanding is he'll even help locate used parts but this would take longer. Jim
QUOTE |
I would seriously consider getting a good used tranny and rebuilding that while keeping yours in reserve. |
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