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R33 Gtst

Mattw_83
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Mattw_83 Community Regular

Mattw_83

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Posted

hey,

anyone care to give me a brief idea of what symptoms id expect for worn synchros?

when i change mainly from 2nd to 3rd (and sometimes 1 to 2nd) i can feel contact similar to when its attempted without the clutch fully depressed. I can also force this by coasting, clutch fully depressed, and move between say second and third there is a definate point of crunch.

Sound like synchros or more like the clutch no disengaging enough?

Yeah i got no idea.... wouldnt mind attempting to having a vague idea before i take it to a mechanic and get screwed.

Cheers.

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The Dan Grand Master

The Dan

Posted
Posted
hey,

anyone care to give me a brief idea of what symptoms id expect for worn synchros?

when i change mainly from 2nd to 3rd (and sometimes 1 to 2nd) i can feel contact similar to when its attempted without the clutch fully depressed. I can also force this by coasting, clutch fully depressed, and move between say second and third there is a definate point of crunch.

Sound like synchros or more like the clutch no disengaging enough?

Yeah i got no idea.... wouldnt mind attempting to having a vague idea before i take it to a mechanic and get screwed.

Cheers.

Is the clutch engage point near the floor or near the top of the pedal travel. If its near the floor, it could be out of adjustment and be causing the problem you are describing.

If it's mid way or near the top then this is not your problem.

Line clamp the slave cylinder flex hose and then put your put firmly on the pedal. Note if it sinks or is immediately solid.

If it is solid, the the master cylinder is going to be ok. Check the slave cylinder has minimum 12mm of travel when the clutch is depressed. If you have at least 12mm of travel and the slave pushrod is not sinking back into the cylinder, then the problem could eaither be:

A grabbing spigot

A misaligned/bent clutchplate

Worn Synchros

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Birds Grand Master

Birds

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This is most likely gear synchros - second and third are always the first to go because they are the most commonly used and frequently abused gears. Clutch related problems typically show these symptoms in all of the gears as opposed to one or two.

Does it make the crunch sound on downshift? If so, try double clutching it to see if this gets rid of the sound. If it does then it is definitely worn synchros. The usual go with it is a gearbox recondition. Budget about $1300-1500 for the lot.

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The Dan Grand Master

The Dan

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This is most likely gear synchros - second and third are always the first to go because they are the most commonly used and frequently abused gears. Clutch related problems typically show these symptoms in all of the gears as opposed to one or two.

Does it make the crunch sound on downshift? If so, try double clutching it to see if this gets rid of the sound. If it does then it is definitely worn synchros. The usual go with it is a gearbox recondition. Budget about $1300-1500 for the lot.

That is true but poor hydraulic pressure will actually emphasize a slightly worn synchro, even though it may not be near the end of it's life. And it is not so good to assume his synchros are at fault even though it is probably the most likely cause.

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Birds Grand Master

Birds

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I use a little chart on my wall that says "Skyline gearbox crunching = thrashed synchros". To date it has never let me down :D

But I accept your point is plausible. Low gearbox oil can produce similar symptoms too.

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Mattw_83 Community Regular

Mattw_83

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I use a little chart on my wall that says "Skyline gearbox crunching = thrashed synchros". To date it has never let me down :whistling:

But I accept your point is plausible. Low gearbox oil can produce similar symptoms too.

Down shift doesnt seem as bad but not much difference to be honest. Does the same this coasting, along clutch, in between 3 and 4th. Doesnt seem to matter what gear. I can find a spot where it grinds.

Clutch take up point is around the middle to upper end. If the car is rolling say at walking pace (or even less), it doesnt like being given first gear as easily.

Anyhow, ive got around 200kw atw now so im more than likely pushing the boundaries of the stock clutch. Change that next week. whatever can handle up to 250kw or thereabouts. and do gearbox oils aswell with something decent. f**king expensive to reco a gearbox $1500 bucks!!! oh well we'll see i guess

Cheers for the response.

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Mattw_83 Community Regular

Mattw_83

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Down shift doesnt seem as bad but not much difference to be honest. Does the same this coasting, along clutch, in between 3 and 4th. Doesnt seem to matter what gear. I can find a spot where it grinds.

Clutch take up point is around the middle to upper end. If the car is rolling say at walking pace (or even less), it doesnt like being given first gear as easily.

Anyhow, ive got around 200kw atw now so im more than likely pushing the boundaries of the stock clutch. Change that next week. whatever can handle up to 250kw or thereabouts. and do gearbox oils aswell with something decent. f**king expensive to reco a gearbox $1500 bucks!!! oh well we'll see i guess

Cheers for the response.

aahhh try again with the below punctuation.. top effort.

Down shift doesnt seem as bad but not much difference to be honest. Does the same thing coasting along, clutch in, between 3 and 4th. Doesnt seem to matter what gear. I can find a spot where it grinds....

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4NTM4N Enthusiast

4NTM4N

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in my r33 4th gear does it even if im just cruising slowly through gears but i can avoid it my double clutching, also does it down shifting from 5th to 4th, i know....its fked haha but can you just get 4th reconditioned for cheaper cos were not all made of money or am i up for the whole shabam?

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Birds Grand Master

Birds

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So it is crunching in all gears then? If this is the case it is probably a clutch issue...synchros usually give way to only one or two gears crunching. The fact you have that much travel in your clutch pedal before contact...your pressure plate may be severely worn or you have air in the hydraulic lines?

in my r33 4th gear does it even if im just cruising slowly through gears but i can avoid it my double clutching, also does it down shifting from 5th to 4th, i know....its fked haha but can you just get 4th reconditioned for cheaper cos were not all made of money or am i up for the whole shabam?

You can get just 4th gear repaired but it's not very good practice to just repair a box and put it back together with old seals and bearings. Weakens the tolerances of the gearbox and the thing will probably need to be pulled apart again in a few thousand km simply because another bearing will fail.

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