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Gearbox help

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Started by 4bangr, Dec 11 2015 08:10 AM
gearbox gsr 4g93 93

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13 replies to this topic

#1
4bangr
Posted 11 December 2015 - 08:10 AM

4bangr

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I'm in need of some help, so last weekend i swapped over my gearbox since the old one was crunching, i was told the gearbox i installed was mint, after installing a new clutch and putting it back together with new fluid and correct grade of oil it wouldn't select first unless i shifted into second or third then it will go in no problem. Straight away i thought it would be the gear selector linkage or something along those lines but they seem to be working fine, the bushes look fine also. I found that the gear selector bracket was abit sloppy so i swapped it over from my old gearbox. But that still didn't fix it. I do have a sloppy gear leaver from the previous owner modifying it abit but it always went into gear on the old gearbox... Any ideas?


#2
jack be nimble
Posted 11 December 2015 - 08:36 AM

jack be nimble

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Any clutch drag?
4g93t jumbuck conversion. PRANGED 18/3/12, CHECK MY MEMBER RIDES Page 11. no serious human injuries.
ON THE ENGINE STAND. g4cs 2.4l + Gt35r. PLUS: auto conversion + Awd coming.
thanks for parts and help: BMGTZ, EVOCPE, cwolf, Benozi, Jamo-GSR, 1JUM2NV, RXVII..much appreciated, cheers guys.
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#3
4bangr
Posted 11 December 2015 - 09:47 AM

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Nope no clutch drag, clutch fluid levels all good, flywheel has been machined. Neutral somehow ended up being first gear for a couple times so that was weird.. All the other gears are fine.


#4
evo-gsr
Posted 11 December 2015 - 09:53 AM

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Synchros are fucked.
[qoute name="BMGTZ" post="331212" timestamp="1467451744"]I don't know anything ...
Trust in the master of taxis.... He will set you straight[/quote]

#5
BMGTZ
Posted 11 December 2015 - 09:54 AM

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how long did the box sit around?   Im thinking the synchro for first is sticky or seized.  It MIGHT  improve with a bit of driving. BUT don't dress in drag or you may get caught out if she blows up.

 

you can also try running some diesel engine oil in the box while all four wheels are off the ground. Run through first up to say 5000 and the take you foot off to allow it to lose speed. the second same...do this twenty or so times.

 

each time gently select first with the wheels spinning.IF it crunches alot...the box seller needs to answer some question


BRIAN
Black evo 1 full road rego and done properly/legally

I have heaps of parts...but never the one I need.

 

 

#6
4bangr
Posted 11 December 2015 - 10:03 AM

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Damn was hoping it wasn't the gearbox, it has been sitting around for a while so yes i think your right and yes will give that a try. Just hope it frees up.


#7
BMGTZ
Posted 11 December 2015 - 10:06 AM

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it has worked for me in the past. DO NOT DRIVE IT with the diesel oil in the box.


BRIAN
Black evo 1 full road rego and done properly/legally

I have heaps of parts...but never the one I need.

 

 

#8
4bangr
Posted 11 December 2015 - 10:11 AM

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Did it ever happen again to you or just the once? any troubles after running diesel oil in your gearbox? 


#9
evo-gsr
Posted 11 December 2015 - 10:16 AM

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You only run it as described to free the synchro up..then dump it and refill with correct oil mate.
[qoute name="BMGTZ" post="331212" timestamp="1467451744"]I don't know anything ...
Trust in the master of taxis.... He will set you straight[/quote]

#10
4bangr
Posted 11 December 2015 - 10:23 AM

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Sweet thanks all for the help, hopefully this works! 


#11
BMGTZ
Posted 11 December 2015 - 11:05 AM

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No..it was fine after the synchro was moving...the diesel oil has lots of detergent in it so will get rid of a bit of sludge. No trouble after


BRIAN
Black evo 1 full road rego and done properly/legally

I have heaps of parts...but never the one I need.

 

 

#12
Evo-00x
Posted 12 December 2015 - 08:35 AM

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Try raising the rpm with the accelerator to 1500-2000rpm, foot on clutch, then try gently shifting it into 1st to see if it slides in better in the meantime.

If it does then yeah, the first synchro needs replacing and you will need to raise the rpm a little bit everytime you want to go into 1st gear. 

It could be several things really. Even a slight notch in the shift rail or end of the rail that doesnt want to slide properly can do it, loose or damaged keys and springs in 1st/2nd hub and slider, synchros etc.

Try Brian's method of cleaning the guts out and see if it works.


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#13
4bangr
Posted 12 December 2015 - 11:15 AM

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Cheers for that mate, will try that tomorrow, took it for a good drive today almost every time i shift into second then first it engages. Maybe i could swap the first synchro out of my old gearbox and put it in this one.


#14
4bangr
Posted 14 December 2015 - 08:24 AM

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Quick question has anyone tried mb-l8 for a gearbox additive??


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