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Clutch or gearbox ?

Tech Talk for Nissan owners.

Moderators: toaddog, V8Patrol

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Posts: 206
Joined: Thu Sep 02, 2004 4:32 am
Location: Jamaica/(Haiti)

Clutch or gearbox ?

Post by Lawrence »

Hi fellas. A couple of weekends ago, I did a gear box swap on the Patrol, it now turns out the the box I swapped has some bad bearings (noise in all gears except fourth plus admission by previous owner!).
I also put in a new clutch disk and throw out bearings.

My problem is that when I am in a lot of traffic, it gets hard to select gear after a while. It seems fairly ok in regular driving though. and once I am back on the highway it seems to behave quite normaly.
Also fourth pops/slips out if I give it gas quickly. Could this be the master or slave cylinder needing bleeding? Also (i am not sure if this is related), when the vehicle is on an incline and in neutral, it refuses to move, with the handbrake off. My mechanic tested it for binding, but he says it seems ok. I dont know if this is related to the previous problem.



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Kingy
89 gq dx. bone stock --- for now.
Posts: 9
Joined: Sat Oct 02, 2010 10:30 pm

Re: clutch or gearbox

Post by djmMQ »

sounds like the slecter fork in side the gear box time for a rebuild
Posts: 1383
Joined: Tue May 06, 2008 8:12 pm
Location: Newcastle

Re: Clutch or gearbox?

Post by oldmate »

Lawrence wrote:Hi fellas. A couple of weekends ago, i did a gear box swap on the Patrol It now turns out the the box i swapped has some bad bearings (noise in all gears except fourth plus admission by previous owner!). i also put in a new clutch disk and throw out bearings. My problem is that when i am in a lot of traffic, it gets hard to select gear after a while. It seems fairly ok in regular driving though. and once I am back on the highway it seems to behave quite normal. Also fourth pops/slips out if I give it gas quickly. Could this be the master.slave cylinder needing bleeding? Also (i am not sure if this is related), when the vehicle is on an incline and in neutral, it refuses to move, with the handbrake off. My mechanic tested it for binding, but he says it seems ok. I dont know if this is related to the previous problem.

Popping out of 4th is a gearbox problem. Could be worn parts like the dog teeth, or the shimming could be way too loose.

I'd start with changing the gearbox as that's an obvious problem. Then look at the clutch system. The hard shifting in traffic is possibly old fluid boiling from the heat of the standing motor, and the pressure from holding down the pedal. Change the fluid first. If the cylinders aren't leaking they are probably ok. But if a fluid change doesn't fix it you may have to look at the accumulator. You should also check the pedal for adjustment, make sure it's giving enough throw.

Not rolling on a hill is an interesting one. I'd be sure it's a brake related issue. I can't imagine enough binding/friction in the drive train to hold it, without presenting obvious problems when driving.
The worst part about being told you have Alzheimer's, is that it doesn't just happen once.
Posts: 206
Joined: Thu Sep 02, 2004 4:32 am
Location: Jamaica/(Haiti)

Re: Clutch or gearbox?

Post by Lawrence »

oldmate wrote:
Lawrence wrote:Hi fellas. A couple of weekends ago, i did a gear box swap on the Patrol It now turns out the the box i swapped has some bad bearings (noise in all gears except fourth plus admission by previous owner!). i also put in a new clutch disk and throw out bearings. My problem is that when i am in a lot of traffic, it gets hard to select gear after a while. It seems fairly ok in regular driving though. and once I am back on the highway it seems to behave quite normal. Also fourth pops/slips out if I give it gas quickly. Could this be the master.slave cylinder needing bleeding? Also (i am not sure if this is related), when the vehicle is on an incline and in neutral, it refuses to move, with the handbrake off. My mechanic tested it for binding, but he says it seems ok. I dont know if this is related to the previous problem.

Popping out of 4th is a gearbox problem. Could be worn parts like the dog teeth, or the shimming could be way too loose.

I'd start with changing the gearbox as that's an obvious problem. Then look at the clutch system. The hard shifting in traffic is possibly old fluid boiling from the heat of the standing motor, and the pressure from holding down the pedal. Change the fluid first. If the cylinders aren't leaking they are probably ok. But if a fluid change doesn't fix it you may have to look at the accumulator. You should also check the pedal for adjustment, make sure it's giving enough throw.

Not rolling on a hill is an interesting one. I'd be sure it's a brake related issue. I can't imagine enough binding/friction in the drive train to hold it, without presenting obvious problems when driving.
Thanks guys, I will change the fluid in the master and slave, as they didnt change that, when the did the gearbox and it hasnt been changed in a couple years. What is the accumulater?
Maybe when I change the box, the binding problem will go away.
89 gq dx. bone stock --- for now.
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