heyitsrama Posted August 13, 2022 Share #97 Posted August 13, 2022 @Patcon Which internal clearance are you referencing? Here are a couple of them: 1. baulk ring to glear clearance ( page - MT-11) 2. gear end play (page - MT-11) 3. front counter shaft bearing (page MT-7) 280zx-manualtransmission.pdf Link to comment Share on other sites More sharing options...
Patcon Posted August 13, 2022 Author Share #98 Posted August 13, 2022 @heyitsrama thanks for that. I was thinking of the gear end play. I suspect there is nothing for me to check with the baulk ring to gear clearance because they are all new. Don't know on the front counter shaft Link to comment Share on other sites More sharing options...
heyitsrama Posted August 13, 2022 Share #99 Posted August 13, 2022 I've been stumped on the front counter shaft, it seems like the value changes based on where i measure the bearing to the faceplate, as if its not sitting flat in the housing... It might be how I am using the end of the digital caliper to take the measurement, there could be variable in where I am holding it. If you are looking for a way to torque down the main nut, i used an autozone inner tie rod tool rental. It worked like a charm, after that you should be ready to measure the gear end play. 1 Link to comment Share on other sites More sharing options...
Patcon Posted August 15, 2022 Author Share #100 Posted August 15, 2022 So the countershaft front bearing shim, If I don't do this test (MT-7 to 8), what is the downside risk? I believe we reused the existing shim that was in the transmission Link to comment Share on other sites More sharing options...
Zed Head Posted August 15, 2022 Share #101 Posted August 15, 2022 I think that the shim is meant to correct for the expansion of the aluminum case when it heats up. And/or it locks the outer race down so it won't spin. It's basically a preload shim. Too loose and the race might spin. That's my guess. I also remember finding that all of the ones I measured were 0.3 mm. Like Nissan figured out their manufacturing problems and they were all identical. The picture seems to show that it rides on both races but I thought it only contacted the outer. Could be wrong, can't remember. Link to comment Share on other sites More sharing options...
Patcon Posted August 15, 2022 Author Share #102 Posted August 15, 2022 So can somebody confirm that I am checking these in the correct spots? 1st gear 2nd gear 3rd gear We don't have enough clearance on this side of the gear but there is extra on the front side between the bearing and clip Reverse 5th gear We do not have enough clearance at this location. We only have 0.0025" versus min .0122" 1 Link to comment Share on other sites More sharing options...
EuroDat Posted August 15, 2022 Share #103 Posted August 15, 2022 The front bearing shim is important for distributing the axial forces over the two cluster shaft bearings. No shim and the bearing in the adapter plate has to carry all the forces and waer faster. You can determine the shim thickness using plastagauge. I thick the yellow (0,2 to 0,4) would be best choice I think. The clearance on 5th gear is very tight and will probably cause lubricating issues Link to comment Share on other sites More sharing options...
Patcon Posted August 15, 2022 Author Share #104 Posted August 15, 2022 47 minutes ago, EuroDat said: The front bearing shim is important for distributing the axial forces over the two cluster shaft bearings. No shim and the bearing in the adapter plate has to carry all the forces and waer faster. You can determine the shim thickness using plastagauge. I thick the yellow (0,2 to 0,4) would be best choice I think. The clearance on 5th gear is very tight and will probably cause lubricating issues I don't totally understand the technique for checking the front bearing shim. Can you clarify that for me? Also how do you adjust the rear clearance. You torque the nut to spec but then I don't have enough clearance. Do you then back it off? Are the other locations the proper places to check? Do we need to move the large bearing forward to get the clearance on the backside? Link to comment Share on other sites More sharing options...
EuroDat Posted August 16, 2022 Share #105 Posted August 16, 2022 5 hours ago, Patcon said: I don't totally understand the technique for checking the front bearing shim. Can you clarify that for me? Also how do you adjust the rear clearance. You torque the nut to spec but then I don't have enough clearance. Do you then back it off? Are the other locations the proper places to check? Do we need to move the large bearing forward to get the clearance on the backside? Easiest way to gain the right clearance on the rear gear is to add a shim between the large washer (in your photo you are holding it with your finger and thumb). If you buy the thin brass shim stock you can cut a washer with a good pair of scissors. Add the shim stock to the gear side of the washer to add clearance. When I'm home I will take some photos of what I mean with Plastagauge and how to use it on the bearing. 1 Link to comment Share on other sites More sharing options...
EuroDat Posted August 16, 2022 Share #106 Posted August 16, 2022 (edited) I just checked my plastigauge stock and the brand Plastigauge would be green (PL-C) for the clearance 0.175 to 0.5mm. It is easy to use. Just break off a couple of short 15mm lengths and place them on the bearing. Place the plastigauge on one of the cage humps across to the outer race. You can hold it in place with a dab of play-doe on the cage section. Bolt on the front cover with gasket to the correct torque. Open it up gentle and don't twist the cover. The section of plastagauge over the outer race will be flatter than the rest. Use the gauge setting on the packet to determine clearance. Plenty of videos on youtube. If you can't find any plastagauge, PM me. Edited August 16, 2022 by EuroDat Link to comment Share on other sites More sharing options...
EuroDat Posted August 16, 2022 Share #107 Posted August 16, 2022 The fifth gear clearance can be corrdcted by adding shim stock between the washer (pos 21) and overdrive gear bushing (pos 20). Shim stock thickness 0.01 (0.25mm) is easy to cut with tin cutters. You could try to find shim washers the right size. Google "shim washers din 988". Go for the right inner diameter if you can't find one with the right dimensions. Trimming the outer diameter is easier than the inner diameter. 1 Link to comment Share on other sites More sharing options...
Patcon Posted August 17, 2022 Author Share #108 Posted August 17, 2022 Thanks Chas! That's perfect. On 8/15/2022 at 7:45 PM, Patcon said: Do we need to move the large bearing forward to get the clearance on the backside? Do we need to shift this bearing forward? Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now