1992 V6sei auto gearbox repair

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MTXM
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Re: 1992 V6sei auto gearbox repair

Post by MTXM » Fri Mar 08, 2019 12:11 pm

This may or may not be significant, but I have noticed that the engine revs very slightly increase when gears are engaged and there is much less resistance when moving the selector handle. Regards, Matthew T.
1989 V6 Exclusive (Poland car)
1990 V6sei auto (grey auto)
1990 V6sei manual (gold car)
1990 V6.24 Pallas (Germany car)
1990 V6.24v (Scotland car)
Other previous XM sold and broken too many to mention!

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Re: 1992 V6sei auto gearbox repair

Post by xantia_v6 » Fri Mar 08, 2019 5:55 pm

MTXM wrote:
Fri Mar 08, 2019 12:11 pm
This may or may not be significant, but I have noticed that the engine revs very slightly increase when gears are engaged and there is much less resistance when moving the selector handle. Regards, Matthew T.
I guess that could indicate that something is releasing all of the hydraulic pressure, except in Neutral?
1999 XM Exclusive V6 24V ES9 Manual (LHD) 105,000 km
1997 Xantia Exclusive V6 (RHD) 45,000 miles

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MTXM
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Re: 1992 V6sei auto gearbox repair

Post by MTXM » Fri Mar 08, 2019 7:01 pm

It certainly feels like there is no pressure Mike, with no gears engaging and very little resistance when moving the lever, but what might be the cause? I understand failure of the pump is unlikely due to the robust design and there would be resultant overheating with discolored and smelly oil, plus probably metal debris. A blown seal or some other kind of leak would be more probable I guess, although where else in the box do such critical seals reside and are there many possible suspects? With regards, Matthew T.
1989 V6 Exclusive (Poland car)
1990 V6sei auto (grey auto)
1990 V6sei manual (gold car)
1990 V6.24 Pallas (Germany car)
1990 V6.24v (Scotland car)
Other previous XM sold and broken too many to mention!

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Re: 1992 V6sei auto gearbox repair

Post by Dean » Fri Mar 08, 2019 8:41 pm

Each clutch has a hydraulic piston that engages it, these have seals.

The detent you feel in the gear selector is from within the box, you can see the mechanism underneath the valve block when removed, it operates one valve which is not spring loaded and offers no resistance at all.
You can feel the detents cant you, i take it the selector cable has not snapped or become detached.

D
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Re: 1992 V6sei auto gearbox repair

Post by White Exec » Fri Mar 08, 2019 9:27 pm

Don't (autobox) engine revs increase slightly when a gear is engaged, to counteract t/c drag, and maintain a smooth idle speed?
Chris
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Re: 1992 V6sei auto gearbox repair

Post by MTXM » Fri Mar 08, 2019 9:37 pm

Hi Dean,
I note that each of the five clutches has a hydraulic piston with seals that presumably can sometimes fail, although my fault is effecting all gears. As the engine revs are slightly increasing when gears are engaged I am guessing that the selector cable and mechanism are operating, but I will certainly check when I next remove the valve block. The gear positions feel positive when I move the lever and there is just less resistance I guess as the drive does not engage.
With regards,
Matthew T.
Last edited by MTXM on Fri Mar 08, 2019 9:47 pm, edited 2 times in total.
1989 V6 Exclusive (Poland car)
1990 V6sei auto (grey auto)
1990 V6sei manual (gold car)
1990 V6.24 Pallas (Germany car)
1990 V6.24v (Scotland car)
Other previous XM sold and broken too many to mention!

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MTXM
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Re: 1992 V6sei auto gearbox repair

Post by MTXM » Fri Mar 08, 2019 9:43 pm

I believe you are correct Chris that the slight increase in engine revs is normal, which on reflection may be purely down to a message from the switch on the outside of the gearbox. Perhaps I am therefore wrong in assuming the mechanism inside the box is operating, although there is some resistance and the switch certainly works as the dashboard indicator reads correctly. With regards, Matthew T.
1989 V6 Exclusive (Poland car)
1990 V6sei auto (grey auto)
1990 V6sei manual (gold car)
1990 V6.24 Pallas (Germany car)
1990 V6.24v (Scotland car)
Other previous XM sold and broken too many to mention!

xantia_v6
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Re: 1992 V6sei auto gearbox repair

Post by xantia_v6 » Fri Mar 08, 2019 11:49 pm

Check the diagrams, but I don't think that the neutral switch connects to anything other than the starter relay, so can have no effect on the idle speed.

Maybe you should invest in a pressure gauge?
1999 XM Exclusive V6 24V ES9 Manual (LHD) 105,000 km
1997 Xantia Exclusive V6 (RHD) 45,000 miles

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Re: 1992 V6sei auto gearbox repair

Post by White Exec » Sat Mar 09, 2019 7:45 am

Or just injection ECU looking after idle speed? Otherwise, engaging gear/drive would cause idle speed to drop, surely?
Chris
1996 XM 2.5TD Exclusive RP7165 Polar White
2003 RAV4 D4D 2.0 5dr LHD Silver WORKHORSE
1989 BX19RD Delage Red Deceased; 1998 ZX 1.9D Avantage auto Triton Green Company car 1998-2001; 2001 Xantia 1.8i auto Wicked Red Company car 2001-2003

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Re: 1992 V6sei auto gearbox repair

Post by MTXM » Sat Mar 09, 2019 9:00 am

I think you may be right about the gearbox switch not sending information to the engine ecu Mike, but what else would increase the revs when gears are selected? I also agree with Chris that engagement of gears should really lower revs as the engine takes up load, although there is of course no engagement in this case! With regards, Matthew T.
1989 V6 Exclusive (Poland car)
1990 V6sei auto (grey auto)
1990 V6sei manual (gold car)
1990 V6.24 Pallas (Germany car)
1990 V6.24v (Scotland car)
Other previous XM sold and broken too many to mention!

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