5 speed transmission leak
Moderators: notoptoy, S Allen, Solex68
- SDkvrd
- Roadster Nut-Site Supporter
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5 speed transmission leak
5-speed Gearbox appears to have been leaking for a while due to a failed control rod o-ring. Looks like I need to replace No. "4-5" as shown in the schematic. Never taken a tail shaft housing off one of these. The rear drive flange could be finicky, but it can't be much different than an L-series gearbox. Any helpful hints?
1967 Datsun 2000 SRL311-00067
1973 Datsun 240Z HLS30-168065
1975 Datsun 280Z HLS30-209491
2007 BMW G650X Challenge
1973 Datsun 240Z HLS30-168065
1975 Datsun 280Z HLS30-209491
2007 BMW G650X Challenge
- jrusso07
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Re: 5 speed transmission leak
It is finicky for sure. I used a big dead blow plastic hammer and a short 2x4 and pounded it to separate. Had transmission standing up with bell housing sitting on a couple of 2x4s so that input shaft isn't in contact with floor. Tail piece up in the air.
I put a long, 3/4 " dia. wooden dowl in the speedo gear mounting hole to hold grand while removing rear nut.
Had to bang on tail shaft mounting flange for a while before it separated. DO NOT attempt to pry the tail shaft off. Housing is soft!
I put a long, 3/4 " dia. wooden dowl in the speedo gear mounting hole to hold grand while removing rear nut.
Had to bang on tail shaft mounting flange for a while before it separated. DO NOT attempt to pry the tail shaft off. Housing is soft!
Joe
1969 SRL311 - Solex
1970 SPL311 - U20 mod
1970 SRL311
1969 SRL311 - Solex
1970 SPL311 - U20 mod
1970 SRL311
- SDkvrd
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Re: 5 speed transmission leak
Thanks for confirming my fears. I might just be tempted to take it to the local transmission guy if I can't persuade the parts to separate on their own.
1967 Datsun 2000 SRL311-00067
1973 Datsun 240Z HLS30-168065
1975 Datsun 280Z HLS30-209491
2007 BMW G650X Challenge
1973 Datsun 240Z HLS30-168065
1975 Datsun 280Z HLS30-209491
2007 BMW G650X Challenge
- notoptoy
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Re: 5 speed transmission leak
This is doable, use the tabs on the tailshaft only to break it loose. Don't pry or whack on anything else with anything but a rubber mallet.
Loosen the screws, give a couple of whacks with the rubber mallet around the base, then use a dowel or extension to focus any serious pounding onto these two tabs indicated in the photo.
Anything stronger than a rubber mallet on the tailshaft and you risk cracking it or punching a hole through. As noted above, never pry between the two surfaces, it's soft, and if you don't do major damage, it'll likely never seal again.
Loosen the screws, give a couple of whacks with the rubber mallet around the base, then use a dowel or extension to focus any serious pounding onto these two tabs indicated in the photo.
Anything stronger than a rubber mallet on the tailshaft and you risk cracking it or punching a hole through. As noted above, never pry between the two surfaces, it's soft, and if you don't do major damage, it'll likely never seal again.
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"When all else fails, force prevails!" Ummm, we're gonna need a bigger hammer here.
67.5 SPL311 H20 w/5 speed
65 Impala Convertible
2017 C43 AMG
67.5 SPL311 H20 w/5 speed
65 Impala Convertible
2017 C43 AMG
- SDkvrd
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Re: 5 speed transmission leak
and getting that control rod out to replace the o-ring, a similarly delicate procedure involved I assume?
1967 Datsun 2000 SRL311-00067
1973 Datsun 240Z HLS30-168065
1975 Datsun 280Z HLS30-209491
2007 BMW G650X Challenge
1973 Datsun 240Z HLS30-168065
1975 Datsun 280Z HLS30-209491
2007 BMW G650X Challenge
- notoptoy
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Re: 5 speed transmission leak
It's been a while since I did it, but I believe the control rod slides right out as you remove the tailshaft housing. Not a problem at all, but of course remove the pin at the back before removing tailshaft. Also remove the speedometer drive gear. And a note, the vent is plastic and can easily be broken as after 40+ years it can be brittle.
"When all else fails, force prevails!" Ummm, we're gonna need a bigger hammer here.
67.5 SPL311 H20 w/5 speed
65 Impala Convertible
2017 C43 AMG
67.5 SPL311 H20 w/5 speed
65 Impala Convertible
2017 C43 AMG
- mraitch
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Re: 5 speed transmission leak
While you have the tranny out, check to see if the shifter springs are broken - they are NLA from Nissan, but you might be able to find something similar.
Peter Harrison
1970 1600 (Stroker) - TOAD SAN (Eliza)
1970 1600 (Stock) - As Yet Unnamed
Lake Balboa (SFV) , California
1970 1600 (Stroker) - TOAD SAN (Eliza)
1970 1600 (Stock) - As Yet Unnamed
Lake Balboa (SFV) , California
- SDkvrd
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Re: 5 speed transmission leak
Maybe early Z car 70-71 gearbox parts would work? I'll have to check it out when the case is apart. Thanks to everyone for all the good advice!mraitch wrote:While you have the tranny out, check to see if the shifter springs are broken - they are NLA from Nissan, but you might be able to find something similar.
1967 Datsun 2000 SRL311-00067
1973 Datsun 240Z HLS30-168065
1975 Datsun 280Z HLS30-209491
2007 BMW G650X Challenge
1973 Datsun 240Z HLS30-168065
1975 Datsun 280Z HLS30-209491
2007 BMW G650X Challenge
- sunbeam590
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- Location: Wingham, NSW, Australia
Re: 5 speed transmission leak
There are 3 o rings you will need to replace, the one on the selector shaft 5 and there are one each end of the monkey motion shaft 6-7 you will need to make a stepped drift up to drift out the support tube to get at these, I managed to break off the breather while getting the tail shaft housing off, I will replace it with a metal one .
KEVIN
69 Datsun 2000, Factory Solexes.
69 Datsun 2000, Factory Solexes.
- SDkvrd
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Re: 5 speed transmission leak
Thanks sunbeam590! I'm going to be extra careful to not break off the breather. I hope those o-rings are still available
1967 Datsun 2000 SRL311-00067
1973 Datsun 240Z HLS30-168065
1975 Datsun 280Z HLS30-209491
2007 BMW G650X Challenge
1973 Datsun 240Z HLS30-168065
1975 Datsun 280Z HLS30-209491
2007 BMW G650X Challenge
- sunbeam590
- Roadster Fanatic-Site Supporter
- Posts: 413
- Joined: Sat Dec 10, 2005 6:28 pm
- Location: Wingham, NSW, Australia
Re: 5 speed transmission leak
Any bearing service centre, or parts shop, will have the o rings,
KEVIN
69 Datsun 2000, Factory Solexes.
69 Datsun 2000, Factory Solexes.