gear engagement

Technical advice Q&A

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alfazagato
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#1 gear engagement

Post by alfazagato » Thu Jun 01, 2023 12:46 pm

Series 1.5 and when hot in traffic it becomes extremely difficult to engage 1st gear. When cooler again there is no problem. Any thoughts on the cause of this?

Stuart
Series 1.5 FHC

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mgcjag
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#2 Re: gear engagement

Post by mgcjag » Thu Jun 01, 2023 1:18 pm

Typicall symptom of slave cylinder not adjusted correctly.....Or selector machanism on gearbox cover....Steve
Steve
69 S2 2+2 (just sold) ..Realm C type replica, 1960 xk150fhc

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Gfhug
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#3 Re: gear engagement

Post by Gfhug » Thu Jun 01, 2023 5:23 pm

And as a temporary way to help: engage second gear then first when the car is at rest. It’s an old trick but does work, but sorting out the problem as Steve recommends is the important job.

Geoff
S2 FHC Light Blue
S2 OTS LHD - RHD full restoration

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alfazagato
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#4 Re: gear engagement

Post by alfazagato » Mon Jun 05, 2023 8:35 am

Have checked slave cylinder and have tried trying to engage 2nd gear first. I suspect that the problem is in the selection mechanism in the gearbox. It is clearly heat induced.
Stuart
Series 1.5 FHC

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Tommd
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#5 Re: gear engagement

Post by Tommd » Thu Jun 08, 2023 3:33 pm

When 1st is hard to engage, how is reverse? Does it engage normally or do the gears grind?
Tom

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abowie
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#6 Re: gear engagement

Post by abowie » Thu Jun 08, 2023 8:19 pm

alfazagato wrote:
Mon Jun 05, 2023 8:35 am
It is clearly heat induced.
Stuart
Might be worth changing your oil to Redline MT90.
Andrew.
881824, 1E21538. 889457. 1961 4.3l Mk2. 1975 XJS. 1962 MGB
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia

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alfazagato
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#7 Re: gear engagement

Post by alfazagato » Mon Dec 18, 2023 11:25 am

Well a modicum of adjustment on the slave cylinder push rod has made a difference but still not perfect. Oil change is next on the list and thank you all for your advice. Merry Christmas.

Stuart
Series 1.5 FHC

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madjack4
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#8 Re: gear engagement

Post by madjack4 » Sat Dec 23, 2023 11:06 pm

Hi i changed to automatic transmission fluid on my s3 4 speed its transformed the gear changes hot and cold syncro on second crunched a bit on way down when not fully hot now perfect
Rob 1972 s3 roadster
Aston Martin DB9 Volante

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mtnjag
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#9 Re: gear engagement

Post by mtnjag » Sun Dec 24, 2023 11:24 pm

Try Redline MTL rather than going straight to Auto Trans Fluid.
Viscosity is between MT90 and Auto Trans Fluid.
Been using it in my retrofit later close ration all synchro box for years and works great. A little noiser than MT90 and less than Auto Trans Fluid.
Layne
Car #876005, 62 OTS

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