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| Inspecting a Getrag (Page 1/3) |
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willyt
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JUL 19, 02:04 PM
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Hi All,
Thanks for your help with my clutch questions - I have successfully removed the engine/cradle assy from the car and gotten the transmission off in order to replace the clutch and clean up a few things while I'm in there.
(Side note - I removed both exhaust manifolds without breaking any bolts - I may need to buy a lotto ticket)
My Getrag transmission may have a few issues, I wanted to get some advice on how to proceed - here is what I am seeing.
1. Differential bearing play - when I move one axle up/down, the other moves in the opposite direction. I believe this means my differential bearings are shot.
2. I have a fluid leak out of the axle seals - I am planning on replacing them again but I'm not sure it will work with the diff bearing play.
3. I have been finding small metal flakes in my trans fluid since I bought the car a few years ago. It runs and shifts fine, but there is some whine at higher speeds.
I would like to just replace the clutch and get the car back on the road, but I'm wondering if I should split the case and see what's going on in there.
Is is worth splitting the case to see if there is any wear? Or should I just send it for another year or so until I have more time/space to work on it?
If I should split the case, what exactly should I be looking for?
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reinhart
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JUL 20, 09:57 AM
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Another issue: There could be problems you find, but may not be able to find the replacement parts.
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willyt
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JUL 20, 11:17 AM
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| quote | Originally posted by reinhart:
Another issue: There could be problems you find, but may not be able to find the replacement parts. |
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Yes I agree with this. I'm hesitant to open it up, but I also don't want to ruin a transmission that could be saved. My biggest concern is the metal I have found in the gear oil, but I'm not sure if this is to be expected, or a sign of serious issues.
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Raydar
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JUL 20, 12:08 PM
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If you can shake one axle up and down, and that same movement is transferred to the other side, the differential bearings are likely shot.
I would guess that's where the sparkles are coming from.
Does it whine in all gears? Or just particular gears?
If it whines in all gears, I'm guessing it could be the alignment between the output shaft and differential gear. I'm guessing others will jump in if I have mis-spoken.
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fierosound
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JUL 20, 12:44 PM
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willyt
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JUL 20, 01:51 PM
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I believe it whines in all gears, but it is most noticeable in the higher gears.
Thank you very much for that manual, I have most of the service manuals for the car, but I don't think that I've ever seen that one before. I'll read through it in more detail tonight.
I think that I should be able to find out what to look for by reading the manual, so that just leaves the question - is it worth opening up to replace the bearings? Or is my transmission a ticking time bomb until I replace them?
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sanderson231
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JUL 20, 04:18 PM
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I you can wiggle the driveaxle on one side and see the drive axle move on the other, the carrier bearings are toast. If they are, I suspect the transmission has been run low on oil. It is not difficult to split the case to take a look. However there may be other damage if run low on oil like other bearings so inspect closely.
When replacing the carrier bearings they have to be shimmed to get the correct pre-load on the bearings. When I did this over ten years ago the shims were not available from GM. I was able to get shims for a Dodge Stratus that were the correct diameter in various thicknesses. Worst case scenario is that shim can be made from sheet shim stock. GM has special tools for checking the pre-load. As a work around, I put the cases back together and used 4 feeler gauges around the periphery. Without the feeler gauges installed there should be a small gap between the case halves. Start small with the feeler gauges (using the same size on all four sets) and gradually work up to determine the gap. You are looking for 0.002"-.004". If it is more or less than that, split the cases and remove the bearing race from the bell housing side. Install a larger or smaller shim based on gap measurement. If the gap measurement was 0.002" install a shim 0.001" inches thicker. Likewise if the gap measured 0.007, install a shim 0.004" smaller in thickness. Reassemble the cases and re-check the gap to make sure it is 0.002-0.004".
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formerly known as sanderson
1984 Quad 4
1886 SE 2.8L
1988 4.9L Cadillac
1988 3800 Supercharged[This message has been edited by sanderson231 (edited 07-21-2022).]
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willyt
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JUL 20, 04:47 PM
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Good points, thanks for the help. I think I'll open it up while I have it out and count on replacing carrier bearings. Hopefully there isn't too much other damage hiding in there.
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sanderson231
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JUL 21, 06:13 PM
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See my previous post on selecting shims for bearing preload. My memory wasn't quite right. I edited the post after reviewing procedure in service manual. ------------------
formerly known as sanderson
1984 Quad 4
1886 SE 2.8L
1988 4.9L Cadillac
1988 3800 Supercharged
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willyt
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JUL 22, 09:22 AM
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| quote | Originally posted by sanderson231:
See my previous post on selecting shims for bearing preload. My memory wasn't quite right. I edited the post after reviewing procedure in service manual.
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Awesome, thank you sir.
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