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Nissan Patrol gearbox noise - can u help

General Tech Talk

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Posts: 11
Joined: Sun Jul 11, 2004 12:09 pm
Location: Australia

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Nissan Patrol gearbox noise - can u help

Post by AustralianOutdoors »

Hi all from Gerry
;)

i am new to 4x4outerlimits and i have a problem which i hope you can help me solve.

I have a 1983 Nissan MQ Patrol 2.8 litre petrol (L28) with a four speed box.

The gearbox is noisy at the higher rev end in 2nd and 3rd Gears. No noise in top or neutral.
just a little in first
It is like a gearshift vibration and is enhanced when tightly grabbing the
gearshift knob. (I have a noisy knob? - now that's a worry!!)

Seriously, I have removed the gearbox twice and ended up replacing all
bearing in the box plus the Input shaft. The gears all seem in top condition.
Still it remains the same.

I would be extremely pleased if anyone could help by advising me.

Thank you for taking the time to read this message

Regards and thank you

Gerry Noterey
www.australianoutdoors.com
I AM THE OWNER OF AN OUTDOORS WEBSITE AND HAVE A LOT TO DO WITH 4X4 AND OTHER AREAS OF THE OUTDOORS. I HOPE I CAN CONTRIBUTE IN SOME WAY TO OUTERLIMITS 4X4 AND BENEFIT FROM ALL OF YOUR EXPERIENCES
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Post by ozy1 »

This may be a long shot, i am no expert, but if youve replaced all the bearings, and rebuilt the box and all that, could if be a tailshaft vibration the is more evident at the speeds in 2nd and 3rd gears, maybe the tailshaft balance weight has come off somewhere along the lines?
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Joined: Sun Jul 11, 2004 12:09 pm
Location: Australia

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Post by AustralianOutdoors »

Ozy1

Thank you for your reply. i will certainly take a look at that as i have not suspected the tailshaft, but it might be the prob.

Thanks again

Gerry
I AM THE OWNER OF AN OUTDOORS WEBSITE AND HAVE A LOT TO DO WITH 4X4 AND OTHER AREAS OF THE OUTDOORS. I HOPE I CAN CONTRIBUTE IN SOME WAY TO OUTERLIMITS 4X4 AND BENEFIT FROM ALL OF YOUR EXPERIENCES
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Post by Patroler »

Well I'd guess that when you put pressure on your knob it pushes the selectors against the groove in the gears (trying to shift them) making a noise (because they won't move - as they are under acceleration or deccelleration load), they would be in different positions depending on what gear youre in hence noise in different gears.
Ive only really stripped and rebuilt a cbr900 gearbox which is quite different (no synchros and dogs) but the shift forks which moved the gears had specific clearances between the respective gears, was the mq box like that?
And did you check the clearances against factory specs for the shift mechanism?
Also my mq and mk both had stuffed gearshift boots which made everything a lot noisier than it should have been.....
There are no stupid questions, but there are a LOT of inquisitive idiots
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