Hi all,

I have an issue with a td6 5 speed auto box after a rear impact. In drive, the rr barely wants to pull off, yet in manual it's perfect. Once out of first, it can be put in drive and works perfectly. To add to the confusion, sometimes in drive it can be fine!

Everything worked as normal before impact. It seems like it must be something fairly 'simple' to fix as it works sometimes in drive and is fine in manual. So has anyone got any suggestions on where to look?

I am led to believe there are separate clutches for manual mode 1st and auto 1st but the fact it sometimes operates suggests a damaged sensor or solenoid etc...

Thanks for any help

Mike

I have no idea to be honest but if you watch Wheeler Dealers the other week Mike Brewer had that issue with a Porsche Boxster and an oil change of the gearbox resolved it.

Have you checked the gearlever mechanism and electrical connector(s) to the box ?? MY 2010 5.0 SC Galway green and sand interior!!
Have the Faultmate MSV2 Extreme to be tinkering with the settings etc. !!

this might help,

http://www.fullfatrr.com/forum/post87201.html#87201 ... - .- -.




Y. O. L. O.
.

That certainly is strange. In first gear the coast and forward clutches are engaged and the only difference between ‘D’ and ‘Manual’ is that in manual mode the Low/Reverse clutch is additionally applied to bypass the low clutch sprag. The implication therefore is that something has happened to your low clutch sprag, causing it to work intermittently, but it’s hard to see how a rear-end shunt could have caused that?

http://www.xoutpost.com/837639-post1.html

Phil

Thanks guys

The rear end shunt... It was in park and was hit by a corolla doing 60+ MPH without braking. The impact caused little bodywork damage, I was stood ten feet away and therefore saw that the RR didn't move more than a couple inches. This energy therefore went into the box. The transfer box housing split the whole way round.

Just away to read the above links

Holy moly that is a lot of energy to be dissipated. I would talk to the insurance company and claim a new gearbox because that is likely to have done serious damage to it. MY 2010 5.0 SC Galway green and sand interior!!
Have the Faultmate MSV2 Extreme to be tinkering with the settings etc. !!

Yeah there is a lengthy insurance saga going on... They want to write it off but there's no way that's happening! I'd rather fix something than replace it... We'll investigate and find the cause but it's always nice to hear if someone has BTDT...

On a side note, holy it's scary seeing a corolla hit a RR at 60+ MPH without braking! He was watching the blue lights! He staggered out and had only minor injuries (cracked ribs I think) but we had to winch his car off the RR towbar! There is absolutely NO damage to the rear of RR structurally! wow...

Great to know the RR is that solid. Although for energy absorption it is not that great apparently. Still the Corolla crumple zones did a lot of absorbing I guess

Hope you get it all sorted properly asap. At least you can drive it, worst case you have to get a refurbed gearbox (would be good if it is refurbed with Sonnax valve block, just in case..........). MY 2010 5.0 SC Galway green and sand interior!!
Have the Faultmate MSV2 Extreme to be tinkering with the settings etc. !!

Looks like we found the cause, a failed Sprag bearing.

Click image to enlarge

RRPhil wrote:

That certainly is strange. In first gear the coast and forward clutches are engaged and the only difference between ‘D’ and ‘Manual’ is that in manual mode the Low/Reverse clutch is additionally applied to bypass the low clutch sprag. The implication therefore is that something has happened to your low clutch sprag, causing it to work intermittently, but it’s hard to see how a rear-end shunt could have caused that?

http://www.xoutpost.com/837639-post1.html

Phil

Glad to hear you found the cause and glad to hear that Phil was right  MY 2010 5.0 SC Galway green and sand interior!!
Have the Faultmate MSV2 Extreme to be tinkering with the settings etc. !!

Box went in last night, Transfer box half in too, so not much left before it can be tested!