Shifting issues
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Discussion

Marf

Original Poster:

22,907 posts

265 months

Tuesday 27th September 2011
quotequote all
Recently I've found it hard to shift into 3rd gear sometimes. Car is an MR2 Turbo.

Sometimes it goes in without issue, albeit slowly, sometimes it feels like I'm pushing against a solid object and it wont go into gear and I have to move the stick back to neutral and then try again.

The clutch is disengaging fine, have checked and adjusted the rod between pedal and master cylinder, which did improve things marginally.

Classic Grad 98

26,185 posts

184 months

Tuesday 27th September 2011
quotequote all
If adjusting the clutch MC clevis improved it, then you have a clutch issue- leaky slave, bent release arm, air in the fluid... Otherwise you have a baulky shift caused by a worn synchro (blocker ring?) A change of oil might improve it but ultimately it's a mechanical problem which will need fixing!
Have you checked the linkage and what happens if you try to force the shift faster?

Marf

Original Poster:

22,907 posts

265 months

Tuesday 27th September 2011
quotequote all
Classic Grad 98 said:
If adjusting the clutch MC clevis improved it, then you have a clutch issue- leaky slave, bent release arm, air in the fluid...
Clutch itself was new 2 months ago. No issues found when replacing it, bled correctly, all other gears engage fine.


Classic Grad 98 said:
Otherwise you have a baulky shift caused by a worn synchro (blocker ring?) A change of oil might improve it but ultimately it's a mechanical problem which will need fixing!
Oil replaced when the new clutch was fitted

Classic Grad 98 said:
Have you checked the linkage
Not checked linkage yet, a garage MR2 specialising in MR2s suggested it could be a loose linkage, I need to get under the car and check.

Classic Grad 98 said:
and what happens if you try to force the shift faster?
If I try and shift really fast with force behind it, I get the same feeling of shifting against something solid along with some crunching.

Classic Grad 98

26,185 posts

184 months

Tuesday 27th September 2011
quotequote all
Marf said:
Classic Grad 98 said:
Classic Grad 98 said:
Have you checked the linkage
Not checked linkage yet, a garage MR2 specialising in MR2s suggested it could be a loose linkage, I need to get under the car and check.
I'm no MR2 expert, so I'd say do wot they said! Have to say, baulky shifting in one gear and grinding if you rush it are classic syncro symptoms. If that's the case your in for a 'box change/rebuild. Symptoms may be more noticeable since you changed the oil (different grade?) or possibly because you're able to change quicker with your shiny, new, correctly adjusted clutch.

Marf

Original Poster:

22,907 posts

265 months

Tuesday 27th September 2011
quotequote all
Classic Grad 98 said:
I'm no MR2 expert, so I'd say do wot they said!
Granted, but...

Classic Grad 98 said:
Have to say, baulky shifting in one gear and grinding if you rush it are classic syncro symptoms. If that's the case your in for a 'box change/rebuild. Symptoms may be more noticeable since you changed the oil (different grade?) or possibly because you're able to change quicker with your shiny, new, correctly adjusted clutch.
...You do make a good point. I'm hoping it'll be a loose linkage, but I'm gearing(forgive the pun) up for it being a problem inside the box rather than outside the box. We'll see.

WRT to oil grades, I bought what is recomended by Toyota, but I can't be sure what was in there before.


one eyed mick

1,189 posts

185 months

Wednesday 28th September 2011
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Classic 3rd gear syncro failure , only cure is rebuild gear box or a recon unit

Mr2Mike

20,143 posts

279 months

Wednesday 28th September 2011
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The ends of the cables at the gearbox have a rubber bush with a metal inner part which actually locates on the linkage. With age the inner bush can seize and the rubber degrades giving an appalling change - check this before anything else. It's possible to replace these with solid bushes that give a notable improvement in precision, at the expense of a little more vibration though the gearlever.

Marf

Original Poster:

22,907 posts

265 months

Wednesday 28th September 2011
quotequote all
http://www.jap-spec-performance.co.uk/store/produc... - Fitted 18months ago smile

I'll be getting under the car on friday to check the linkages are all secure, will report back then.

Classic Grad 98

26,185 posts

184 months

Wednesday 28th September 2011
quotequote all
If it's grinding into gear and the clutch is fine, then it's syncro. Don't get your hopes up re: linkage, especially since it's already been done!