NissanDiesel forums

Nissan diesel engines, and the people who love them
It is currently Mon Aug 21, 2017 10:44 am

All times are UTC - 8 hours [ DST ]




Post new topic Reply to topic  [ 2 posts ] 
Author Message
Post Number:#1  PostPosted: Thu Dec 12, 2013 12:08 am 
Offline

Joined: Fri Oct 18, 2013 12:29 pm
Posts: 18
Location: Ucluelet, B.C. Canada
Hi Folks

Looking for some suggestions...

I just put in a transmission from a newer truck (FS5W71C). While I was at it I replaced the engine with another SD25 with less time/miles on it....the other one had 500K km and still ran well but getting a little tired.

I had to swap the bell housing of course since the tranny came out of a gas truck.
So...I put the transmission on the engine and then lowered the lot into the truck and after much (and more muches) fiddling got it going and ready to test.
When I first put it in the truck and hooked up the clutch it seemed to work fine although one time the clutch pedal was slow to release from depressed position...though when it did release it came up as normal. That had happened a few times over the two and a half years I have had the truck so wasn't too worried about it ~ perhaps I should have been..?..

Tonight when I went to take it for its first test drive, I discovered that I couldn't push in the clutch. It is stuck all the way back (released) and can only be moved about a 1/4" or so. It is like a hydraulic lock as though it is pushing against oil...not spongy like air. I climbed underneath and the slave cylinder is out (clutch is disengaged). This seems very odd to me as it is the opposite combination to what it should be. I tried to bleed some fluid out of the system to see if it would release but it didn't release - there is a little "distributor gizmo in the line where there is also a bleed screw (or may to accommodate one). I tried to push the slave cylinder back in but couldn't...I didn't get a bar to try to pry it - yet!

I am wondering if there is some way for the slave cylinder to be extended but not return and then for fluid to beed in behind the master cylinder so it is full while the slave cylinder is extended...resulting in a total locking of the system?
Or has something happened inside the clutch mechanism (in the bell housing)...which strikes terror into the heart of someone who has just installed it out in the yard and would have to remove it out in the yard.

Naturally the 'take-apart' option is a last resort scenario since I really have no way of lifting (or more to the point 'moving') the transmission while the truck is on gravel (usually wet!).
I can't figure out what would have happened in there ...or what I would have missed or installed incorrectly to cause this issue.

Any help would be greatly appreciated.

Thanks all

Niseamer


Top
 Profile  
Reply with quote  
Post Number:#2  PostPosted: Fri Jan 31, 2014 8:55 pm 
Offline
Site Admin
User avatar

Joined: Sat Nov 26, 2005 7:28 am
Posts: 5283
Location: Duvall, Wash.
niseamer wrote:
I am wondering if there is some way for the slave cylinder to be extended but not return and then for fluid to beed in behind the master cylinder so it is full while the slave cylinder is extended...resulting in a total locking of the system?


Yup, that can happen, as it did to you.

I'm sure enough time has passed that you've already figured this out for yourself and repaired, but . . .

Generally, I've only seen this happen with a bad clutch pressure plate. You take it apart and all the diaphragm springs are bent up and won't push the throwout bearing and fork back, and that can get the hydraulic actuating system in a state like you found it.

I'm posting this for the other poor folks who find their way here via a search engine in the future.

_________________
Regards,
Al S.

1982 Maxima diesel wagon, 2nd & 4th owner, 165k miles, rusty & burgundy/grey. Purchased 1996, SOLD 16Feb10
1983 Maxima diesel wagon, 199k miles, rusty, light yellow/light brown. SOLD 14Jul07
1981 720 SD22 (scrapped 04Sep07)
1983 Sentra CD17, 255k, bought 06Jul08, gave it away 22Jun10.


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 

All times are UTC - 8 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group