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Thread: 5 Speed gearbox flaw repair

  1. #61
    LS1 DMC Nicholas R's Avatar
    Join Date:  Jun 2011

    Location:  Orlando, Florida

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    My VIN:    01643

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    Quote Originally Posted by DMC-81 View Post
    I just might make it to the Celebration Exotic car show this year... Fingers crossed!!
    You had better be there! Someone has to win "Best in Show," it might as well be you!!

  2. #62
    Senior Member DMC-81's Avatar
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    Quote Originally Posted by Nicholas R View Post
    You had better be there! Someone has to win "Best in Show," it might as well be you!!
    Thanks Nick! Barring anything unforeseen my D will finally be there.

    ------------------------------

    Yesterday, I picked up the car from DMCFL. They did an outstanding job! Now I'll button everything else up that I took off and refurbed.

    image.jpg

    Today, I reinstalled the the diagnostic protecting plate, the crossover pipe, new O2 sensor, and finally, the drive axles, in that order. Tomorrow I'll install my refurbed starter and I'll see if it works with the new solenoid and the starter recall done. I can't wait to hear the engine with my new exhaust manifold gaskets. Plus, I haven't driven it since November.

    image.jpg
    Last edited by DMC-81; 03-31-2017 at 10:11 PM.
    Dana

    Delorean status: CECF 2017 Platinum Award winner. Still tinkering...

    Pictures and comments of my restoration journey are in the albums section on my profile.

    .

  3. #63
    Senior Member DMC5180's Avatar
    Join Date:  May 2011

    Location:  Reedsburg, WI

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    My VIN:    5180

    Club(s):   (DMWC) (DCUK)

    Did you have all the transmission bolts re-plated? They look very fresh.


    Sent from my iPhone using Tapatalk
    DENNIS

    VIN 5180, Frame 3652, STAGE I, DM-eng Solid State Solutions (RPM Rly, Dm.Lt.Mod., Fan Fail Mod. , FAN Rly, HS.Rly) , HID sealed beam style headlights, SPAX user since 2009, Eibach springs, Mid-State Club Adj. Rear LCA's, DPNW poly-sway bar kit, DMCEU LCA Stabilizer link kit, DMCMW Illuminated door sills, Aussie Illuminated SS Shifter plate, GENUINE MOMO EVO Steering wheel, DELOREANA Extended View Side Mirrors w/ Heaters, DELOREANA LED Door Lights.

  4. #64
    Certified Stainless!! Chris Burns's Avatar
    Join Date:  May 2011

    Location:  Fernandina Beach Fl

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    Awesome work on this DMC!!

    Love to see her at a show some day.....

  5. #65
    Senior Member DMC-81's Avatar
    Join Date:  Apr 2014

    Location:  Florida

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    Quote Originally Posted by DMC5180 View Post
    Did you have all the transmission bolts re-plated? They look very fresh.


    Sent from my iPhone using Tapatalk
    Thanks Dennis. I didn't have time to have them replated, but it did soak (in engine degreaser) and scrub each bolt, nut, and washer.

    Quote Originally Posted by Chris Burns View Post
    Awesome work on this DMC!!

    Love to see her at a show some day.....
    Thanks Chris. I plan to be at Celebration.

    -----------------------------

    Well, I finished up the parts that had to be reinstalled, and started it today. It sounds good.

    Here is the starter reinstalled..

    image.jpg

    I initially had a problem with the drive axle flanges being too loose. It turned out that I missed one extra turn on the differential adjustment nut from when I counted the turns until the threads disengaged. All fixed now, and I drove it to fuel it up with non ethanol. I got the usual attention, cameras, 4 people approaching me to compliment the car, and a fist pump of a guy out the window of a passing car.

    image.jpg

    I have a few adjustments to make, but it works.
    Last edited by DMC-81; 04-02-2017 at 07:47 PM.
    Dana

    Delorean status: CECF 2017 Platinum Award winner. Still tinkering...

    Pictures and comments of my restoration journey are in the albums section on my profile.

    .

  6. #66
    Senior Member DMC-81's Avatar
    Join Date:  Apr 2014

    Location:  Florida

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    Quote Originally Posted by DMC-81 View Post
    Thanks Dennis. I didn't have time to have them replated, but it did soak (in engine degreaser) and scrub each bolt, nut, and washer.


    Thanks Chris. I plan to be at Celebration.

    -----------------------------

    Well, I finished up the parts that had to be reinstalled, and started it today. It sounds good.

    Here is the starter reinstalled..

    image.jpg

    I initially had a problem with the drive axle flanges being too loose. It turned out that I missed one extra turn on the differential adjustment nut from when I counted the turns until the threads disengaged. All fixed now, and I drove it to fuel it up with non ethanol. I got the usual attention, cameras, 4 people approaching me to compliment the car, and a fist pump of a guy out the window of a passing car.

    image.jpg

    I have a few adjustments to make, but it works.


    Oh my, I typed "comment" on the car. Dang auto-correct! Oh well. I'm still adjusting the linkage, etc.
    Dana

    Delorean status: CECF 2017 Platinum Award winner. Still tinkering...

    Pictures and comments of my restoration journey are in the albums section on my profile.

    .

  7. #67
    Senior Member DMC-81's Avatar
    Join Date:  Apr 2014

    Location:  Florida

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    Adjustments

    Hi there,

    I need your opinions and experience...

    After my rebuild, the 2nd gear popping out problem is fixed, and the shift action is smooth. However, I am getting gear noise only on deceleration/ coasting in gear. It's not present in 1st gear, but starts in 2nd, and gets progressively quieter in 3, 4 and 5. It sounds not like a whine, but like the gears are not meshing right... click click click. Its loudest in 2nd gear.

    A quick Google search on other vehicles points to bearing preload. When I put the transmission back together I put the Differential Adjustment Nut in the exact same place (I believe) that I found it... 8 1/3 turns out and in.

    First I thought that I had it too tight. I backed it off a little and tested it....no difference. Then today, I put it back at 8 1/3 turns, and then tightened it some. After tightening, this is how much horizontal and vertical play there is in the drive flanges...

    http://youtu.be/u7cUclF5j2c

    Question: is this normal, or is the drive flange not supposed to move at all?

    I'll test it again tomorrow to see if tightening it some made a difference, but I don't know whether the flanges should be solid or have some play as they are only attached with a roll pin. (The flanges and pins are new if that matters)

    Thanks for your input.
    Dana

    Delorean status: CECF 2017 Platinum Award winner. Still tinkering...

    Pictures and comments of my restoration journey are in the albums section on my profile.

    .

  8. #68
    LS1 DMC Nicholas R's Avatar
    Join Date:  Jun 2011

    Location:  Orlando, Florida

    Posts:    2,417

    My VIN:    01643

    Club(s):   (DCF) (DCO) (DCUK)

    Axle flange movement is a difficult measure of whether anything is loose because they're not directly connected to the bearings. That movement is not something that should ever really change because all it is is the backlash in the gears inside the differential. The bearings are actually on the differential crown gear and the differential housing, not on the axle shafts. The movement is just whatever play there is between the shaft gear and the spider gears. In my experience, some play is normal.

    This image explains what I'm trying to say a lot better:

  9. #69
    Senior Member DMC-81's Avatar
    Join Date:  Apr 2014

    Location:  Florida

    Posts:    1,155

    My VIN:    <2000

    Club(s):   (DCF)

    Quote Originally Posted by Nicholas R View Post
    Axle flange movement is a difficult measure of whether anything is loose because they're not directly connected to the bearings. That movement is not something that should ever really change because all it is is the backlash in the gears inside the differential. The bearings are actually on the differential crown gear and the differential housing, not on the axle shafts. The movement is just whatever play there is between the shaft gear and the spider gears. In my experience, some play is normal.

    This image explains what I'm trying to say a lot better:
    Thanks Nick. That makes a lot of sense.

    Well, I test drove it again with the nut tightened approximately 1/8 turn from where it was originally.... The result was no real change. My thinking is if the bearing preload was off, the noise should change as you make adjustments.. Correct?

    Here is more detail on what the symptoms are:

    1) I verified that the noise is not happening in 1st gear, either under load, decelerating, coasting in gear, or when the clutch is engaged or released.

    2) There is a slight clicking in neutral, no matter when the clutch is engaged or released.

    3) The noise happens loudest in 2nd gear, only when decelerating or coasting in gear. It doesn't matter when the clutch is engaged or released.

    4) As mentioned the same thing happens in 3, 4, and 5 to a gradually diminished degree.

    I'm afraid the gearbox needs to come out again but beforehand, I am trying to pinpoint as much as possible what to look at because the first time, I corrected the visible damage and all seals were replaced, plus everything else looked great.

    Question: would damaged spider gears cause the noise? I couldn't really inspect them inside the differential housing.

    Or how about worn bearings on the 2 shafts? (With only 27k on the clock, I wouldn't expect that.)
    Dana

    Delorean status: CECF 2017 Platinum Award winner. Still tinkering...

    Pictures and comments of my restoration journey are in the albums section on my profile.

    .

  10. #70
    Delorean Guru
    Join Date:  May 2011

    Location:  Northern NJ

    Posts:    5,808

    My VIN:    10757

    Club(s):   (DMA)

    There is no good way to check bearing preload except the procedure in the Workshop Manual. If it was ever improperly set you could have damaged the carrier (dif) bearings so no amount of adjustment will stop a noise. Make sure you have the proper amount and the correct type of gear oil. The spider gears have no effect unless you are turning or a wheel is spinning faster or slower than the other. Worn bearings is a possibility but unless the box was operated without oil it is a rarity.
    David Teitelbaum

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