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300/66 Series General Forum for the Volvo 340, 360 and 66 cars |
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340 CVT Reference RPMsViews : 1229 Replies : 6Users Viewing This Thread : |
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Jan 20th, 2003, 23:06 | #1 |
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340 CVT Reference RPMs
I just bought a 1991 340CVT 2 weeks ago and find the gearbox a little unpredictable. Can anyone give me reference figures for what RPM I should be seeing at 20, 30,50 mph under acceleration, cruising, deceleration? 3300 at 30mph cruise seems a little fast to me but the last time I drove a 340CVT was 1985!
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Feb 9th, 2003, 04:56 | #2 |
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RE: 340 CVT Reference RPMs
Yeah - those RPM speeds are wrong. There's a whole load of info in the archive about this topic (if you can find it!). Not an expert myself, but its something to do with a 4-way valve from memory?!
cheers James
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VOC 300-series Register Keeper '13 V70 D4 SE Lux '89 740 Turbo Intercooler '88 360 Turbo Intercooler '84 360 GLT '81 343 GLS R-Sport '79 343 DL '70 164 |
Feb 9th, 2003, 11:38 | #3 |
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RE: 340 CVT Reference RPMs
Try using the search facility for our web site also. I have recently uploaded new documents in pdf format, and several have CVT info.
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Robert Isaac VOC Director 1995 850 T5 auto estate. 280hp 289K miles and purrrs 2009 Jap import V70 2.5T 200hp 51K miles |
Feb 9th, 2003, 22:20 | #4 |
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RE: 340 CVT Reference RPMs
Sounds as if the drive belts need their tension adjusting or may be due for replacement. German, Swedish and French have them at £72 per pair. It is alos possible that the clutch release mechanism (vacuum servo) may need investigation. All the best, Peter |
Feb 10th, 2003, 13:40 | #5 |
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RE: 340 CVT Reference RPMs
Well I've been doing a bit of testing since I posted the original message.
The four way vacuum valve is working correctly from the electrical side and can be heard to click when energising. However if I pull off the change up vacuum hose there is less suck than a baby sucking your finger! Does anyone know how much vacuum I should expect? I have sucked and blown down said hose and it sucks and blows back at me so I hope that means I haven't got blown diaphragms. I have not yet been able to test the vacuum supply to the 4-way valve, although the vacuum servo on the clutch does work. I have also not had a chance to get underneath and check the belt tension. The belts do not skid on the pulleys, though. Also the car behaved much better in the recent warmer weather - Hmm I think I will go for the air intake thermostat next. Any more help would be appeciated. |
Feb 12th, 2003, 17:03 | #6 |
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RE: 340 CVT Reference RPMs
It's the 4-way valve alright.
If I swap the hoses and operate the low ratio hold switch it changes up no problem. It's just manually controlled. Off to find a replacement valve, then. |
Feb 21st, 2003, 22:56 | #7 |
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RE: 340 CVT Reference RPMs
OK
The secondhand vacuum valve arrived and I bunged it on the car but it was dead as a dodo! So I got it off again and stripped down both valves on the kitchen table. The rubber mushrooms on the armatures are stuck to the valve face, not to the armature. I put the old valve back on the car (I have just the one car) and head for Sainsburys for a tube of superglue. Get the old valve back off the car again. Glue the rubber musrooms back together. After time for the glue to dry I reassemble both valves and fit the best one on the car. It works! 2000rpm at 30mph cruise and 3100rpm under acceleration. How long will it last? Now I must get underneath and adjust my drive belt tension before the pulleys chew them up. |
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